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1. Assimilation of GPM-retrieved ocean surface meteorology data for two snowstorm events during ICE-POP 2018

Author: X. Li, J. B. Roberts, J. Srikishen, J. L. Case, W. A. Petersen, G. Lee, and C. R. Hain
Subjects: Geology, QE1-996.5
Abstract: As a component of the National Aeronautics and Space Administration's (NASA's) Weather Focus Area and Global Precipitation Measurement (GPM) Ground Validation participation in the International Collaborative Experiments for the PyeongChang 2018 Olympic and Paralympic Winter Games' (ICE-POP 2018) field research and forecast demonstration programs, hourly ocean surface meteorology properties were retrieved from the GPM microwave observations for January–March 2018. In this study, the retrieved ocean surface meteorological products – 2 m temperature, 2 m specific humidity, and 10 m wind speed – were assimilated into a regional numerical weather prediction (NWP) framework. This explored the application of these observations for two heavy snowfall events during the ICE-POP 2018, on 27–28 February and 7–8 March 2018. The Weather Research and Forecasting (WRF) model and the community Gridpoint Statistical Interpolation (GSI) were used to conduct high-resolution simulations and data assimilation experiments. The results indicate that the data assimilation has a large influence on surface thermodynamic and wind fields in the model initial condition for both events. With cycled data assimilation, a significantly positive influence of the retrieved surface observation was found for the March case, with improved quantitative precipitation forecasts and reduced errors in temperature forecasts. A slightly smaller yet positive impact was also found in the forecast for the February case.
Published: 2022
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2. Intercomparison of freshwater fluxes over ocean and investigations into water budget closure

Author: M. Gutenstein, K. Fennig, M. Schröder, T. Trent, S. Bakan, J. B. Roberts, and F. R. Robertson
Subjects: Technology, Environmental technology. Sanitary engineering, TD1-1066, Geography. Anthropology. Recreation, Environmental sciences, GE1-350
Abstract: The development of algorithms for the retrieval of water cycle components from satellite data – such as total column water vapor content (TCWV), precipitation (P), latent heat flux, and evaporation (E) – has seen much progress in the past 3 decades. In the present study, we compare six recent satellite-based retrieval algorithms and ERA5 (the European Centre for Medium-Range Weather Forecasts' fifth reanalysis) freshwater flux (E−P) data regarding global and regional, seasonal and interannual variation to assess the degree of correspondence among them. The compared data sets are recent, freely available, and documented climate data records (CDRs), developed with a focus on stability and homogeneity of the time series, as opposed to instantaneous accuracy. One main finding of our study is the agreement of global ocean means of all E−P data sets within the uncertainty ranges of satellite-based data. Regionally, however, significant differences are found among the satellite data and with ERA5. Regression analyses of regional monthly means of E, P, and E−P against the statistical median of the satellite data ensemble (SEM) show that, despite substantial differences in global E patterns, deviations among E−P data are dominated by differences in P throughout the globe. E−P differences among data sets are spatially inhomogeneous. We observe that for ERA5 long-term global E−P is very close to 0 mm d−1 and that there is good agreement between land and ocean mean E−P, vertically integrated moisture flux divergence (VIMD), and global TCWV tendency. The fact that E and P are balanced globally provides an opportunity to investigate the consistency between E and P data sets. Over ocean, P (nearly) balances with E if the net transport of water vapor from ocean to land (approximated by over-ocean VIMD, i.e., ∇⋅(vq)ocean) is taken into account. On a monthly timescale, linear regression of Eocean-∇⋅(vq)ocean with Pocean yields R2=0.86 for ERA5, but smaller R2 values are found for satellite data sets. Global yearly climatological totals of water cycle components (E, P, E−P, and net transport from ocean to land and vice versa) calculated from the data sets used in this study are in agreement with previous studies, with ERA5 E and P occupying the upper part of the range. Over ocean, both the spread among satellite-based E and the difference between two satellite-based P data sets are greater than E−P, and these remain the largest sources of uncertainty within the observed global water budget. We conclude that, for a better understanding of the global water budget, the quality of E and P data sets needs to be improved, and the uncertainties more rigorously quantified.
Published: 2021
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3. Measurement of the central exclusive production of charged particle pairs in proton-proton collisions at s $$ \sqrt{s} $$ = 200 GeV with the STAR detector at RHIC

Author: The STAR collaboration, J. Adam, L. Adamczyk, J. R. Adams, J. K. Adkins, G. Agakishiev, M. M. Aggarwal, Z. Ahammed, I. Alekseev, D. M. Anderson, A. Aparin, E. C. Aschenauer, M. U. Ashraf, F. G. Atetalla, A. Attri, G. S. Averichev, V. Bairathi, K. Barish, A. Behera, R. Bellwied, A. Bhasin, J. Bielcik, J. Bielcikova, L. C. Bland, I. G. Bordyuzhin, J. D. Brandenburg, A. V. Brandin, J. Butterworth, H. Caines, M. Calderón de la Barca Sánchez, D. Cebra, I. Chakaberia, P. Chaloupka, B. K. Chan, F-H. Chang, Z. Chang, N. Chankova-Bunzarova, A. Chatterjee, D. Chen, J. H. Chen, X. Chen, Z. Chen, J. Cheng, M. Cherney, M. Chevalier, S. Choudhury, W. Christie, X. Chu, H. J. Crawford, M. Csanád, M. Daugherity, T. G. Dedovich, I. M. Deppner, A. A. Derevschikov, L. Didenko, X. Dong, J. L. Drachenberg, J. C. Dunlop, T. Edmonds, N. Elsey, J. Engelage, G. Eppley, R. Esha, S. Esumi, O. Evdokimov, A. Ewigleben, O. Eyser, R. Fatemi, S. Fazio, P. Federic, J. Fedorisin, C. J. Feng, Y. Feng, P. Filip, E. Finch, Y. Fisyak, A. Francisco, L. Fulek, C. A. Gagliardi, T. Galatyuk, F. Geurts, A. Gibson, K. Gopal, D. Grosnick, W. Guryn, A. I. Hamad, A. Hamed, S. Harabasz, J. W. Harris, S. He, W. He, X. H. He, S. Heppelmann, N. Herrmann, E. Hoffman, L. Holub, Y. Hong, S. Horvat, Y. Hu, H. Z. Huang, S. L. Huang, T. Huang, X. Huang, T. J. Humanic, P. Huo, G. Igo, D. Isenhower, W. W. Jacobs, C. Jena, A. Jentsch, Y. JI, J. Jia, K. Jiang, S. Jowzaee, X. Ju, E. G. Judd, S. Kabana, M. L. Kabir, S. Kagamaster, D. Kalinkin, K. Kang, D. Kapukchyan, K. Kauder, H. W. Ke, D. Keane, A. Kechechyan, M. Kelsey, Y. V. Khyzhniak, D. P. Kikoła, C. Kim, B. Kimelman, D. Kincses, T. A. Kinghorn, I. Kisel, A. Kiselev, A. Kisiel, M. Kocan, L. Kochenda, L. K. Kosarzewski, L. Kramarik, P. Kravtsov, K. Krueger, N. Kulathunga Mudiyanselage, L. Kumar, R. Kunnawalkam Elayavalli, J. H. Kwasizur, R. Lacey, S. Lan, J. M. Landgraf, J. Lauret, A. Lebedev, R. Lednicky, J. H. Lee, Y. H. Leung, C. Li, W. Li, X. Li, Y. Li, Y. Liang, R. Licenik, T. Lin, Y. Lin, M. A. Lisa, F. Liu, H. Liu, P. Liu, T. Liu, X. Liu, Y. Liu, Z. Liu, T. Ljubicic, W. J. Llope, R. S. Longacre, N. S. Lukow, S. Luo, X. Luo, G. L. Ma, L. Ma, R. Ma, Y. G. Ma, N. Magdy, R. Majka, D. Mallick, S. Margetis, C. Markert, H. S. Matis, J. A. Mazer, N. G. Minaev, S. Mioduszewski, B. Mohanty, M. M. Mondal, I. Mooney, Z. Moravcova, D. A. Morozov, M. Nagy, J. D. Nam, Md. Nasim, K. Nayak, D. Neff, J. M. Nelson, D. B. Nemes, M. Nie, G. Nigmatkulov, T. Niida, L. V. Nogach, T. Nonaka, A. S. Nunes, G. Odyniec, A. Ogawa, S. Oh, V. A. Okorokov, B. S. Page, R. Pak, A. Pandav, Y. Panebratsev, B. Pawlik, D. Pawlowska, H. Pei, C. Perkins, L. Pinsky, R. L. Pintér, J. Pluta, J. Porter, M. Posik, N. K. Pruthi, M. Przybycien, J. Putschke, H. Qiu, A. Quintero, S. K. Radhakrishnan, S. Ramachandran, R. L. Ray, R. Reed, H. G. Ritter, J. B. Roberts, O. V. Rogachevskiy, J. L. Romero, L. Ruan, J. Rusnak, N. R. Sahoo, H. Sako, S. Salur, J. Sandweiss, S. Sato, W. B. Schmidke, N. Schmitz, B. R. Schweid, F. Seck, J. Seger, M. Sergeeva, R. Seto, P. Seyboth, N. Shah, E. Shahaliev, P. V. Shanmuganathan, M. Shao, F. Shen, W. Q. Shen, S. S. Shi, Q. Y. Shou, E. P. Sichtermann, R. Sikora, M. Simko, J. Singh, S. Singha, N. Smirnov, W. Solyst, P. Sorensen, H. M. Spinka, B. Srivastava, T. D. S. Stanislaus, M. Stefaniak, D. J. Stewart, M. Strikhanov, B. Stringfellow, A. A. P. Suaide, M. Sumbera, B. Summa, X. M. Sun, X. Sun, Y. Sun, B. Surrow, D. N. Svirida, P. Szymanski, A. H. Tang, Z. Tang, A. Taranenko, T. Tarnowsky, J. H. Thomas, A. R. Timmins, D. Tlusty, M. Tokarev, C. A. Tomkiel, S. Trentalange, R. E. Tribble, P. Tribedy, S. K. Tripathy, O. D. Tsai, Z. Tu, T. Ullrich, D. G. Underwood, I. Upsal, G. Van Buren, J. Vanek, A. N. Vasiliev, I. Vassiliev, F. Videbæk, S. Vokal, S. A. Voloshin, F. Wang, G. Wang, J. S. Wang, P. Wang, Y. Wang, Z. Wang, J. C. Webb, P. C. Weidenkaff, L. Wen, G. D. Westfall, H. Wieman, S. W. Wissink, R. Witt, Y. Wu, Z. G. Xiao, G. Xie, W. Xie, H. Xu, N. Xu, Q. H. Xu, Y. F. Xu, Y. Xu, Z. Xu, C. Yang, Q. Yang, S. Yang, Y. Yang, Z. Yang, Z. Ye, L. Yi, K. Yip, H. Zbroszczyk, W. Zha, D. Zhang, S. Zhang, X. P. Zhang, Y. Zhang, Z. J. Zhang, Z. Zhang, J. Zhao, C. Zhong, C. Zhou, X. Zhu, Z. Zhu, M. Zurek, and M. Zyzak
Subjects: Diffraction, Forward physics, Hadron-Hadron scattering (experiments), Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract We report on the measurement of the Central Exclusive Production of charged particle pairs h + h − (h = π, K, p) with the STAR detector at RHIC in proton-proton collisions at s $$ \sqrt{s} $$ = 200 GeV. The charged particle pairs produced in the reaction pp → p′ + h + h − + p′ are reconstructed from the tracks in the central detector and identified using the specific energy loss and the time of flight method, while the forward-scattered protons are measured in the Roman Pot system. Exclusivity of the event is guaranteed by requiring the transverse momentum balance of all four final-state particles. Differential cross sections are measured as functions of observables related to the central hadronic final state and to the forward-scattered protons. They are measured in a fiducial region corresponding to the acceptance of the STAR detector and determined by the central particles’ transverse momenta and pseudorapidities as well as by the forward-scattered protons’ momenta. This fiducial region roughly corresponds to the square of the four-momentum transfers at the proton vertices in the range 0.04 GeV2 < −t 1 , −t 2 < 0.2 GeV2, invariant masses of the charged particle pairs up to a few GeV and pseudorapidities of the centrally-produced hadrons in the range |η| < 0.7. The measured cross sections are compared to phenomenological predictions based on the Double Pomeron Exchange (DPE) model. Structures observed in the mass spectra of π + π − and K + K − pairs are consistent with the DPE model, while angular distributions of pions suggest a dominant spin-0 contribution to π + π − production. For π + π − production, the fiducial cross section is extrapolated to the Lorentz-invariant region, which allows decomposition of the invariant mass spectrum into continuum and resonant contributions. The extrapolated cross section is well described by the continuum production and at least three resonances, the f 0(980), f 2(1270) and f 0(1500), with a possible small contribution from the f 0(1370). Fits to the extrapolated differential cross section as a function of t 1 and t 2 enable extraction of the exponential slope parameters in several bins of the invariant mass of π + π − pairs. These parameters are sensitive to the size of the interaction region.
Published: 2020
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4. Predicting East African spring droughts using Pacific and Indian Ocean sea surface temperature indices

Author: C. Funk, A. Hoell, S. Shukla, I. Bladé, B. Liebmann, J. B. Roberts, F. R. Robertson, and G. Husak
Subjects: Technology, Environmental technology. Sanitary engineering, TD1-1066, Geography. Anthropology. Recreation, Environmental sciences, GE1-350
Abstract: In eastern East Africa (the southern Ethiopia, eastern Kenya and southern Somalia region), poor boreal spring (long wet season) rains in 1999, 2000, 2004, 2007, 2008, 2009, and 2011 contributed to severe food insecurity and high levels of malnutrition. Predicting rainfall deficits in this region on seasonal and decadal time frames can help decision makers implement disaster risk reduction measures while guiding climate-smart adaptation and agricultural development. Building on recent research that links more frequent East African droughts to a stronger Walker circulation, resulting from warming in the Indo–Pacific warm pool and an increased east-to-west sea surface temperature (SST) gradient in the western Pacific, we show that the two dominant modes of East African boreal spring rainfall variability are tied to SST fluctuations in the western central Pacific and central Indian Ocean, respectively. Variations in these two rainfall modes can thus be predicted using two SST indices – the western Pacific gradient (WPG) and central Indian Ocean index (CIO), with our statistical forecasts exhibiting reasonable cross-validated skill (rcv ≈ 0.6). In contrast, the current generation of coupled forecast models show no skill during the long rains. Our SST indices also appear to capture most of the major recent drought events such as 2000, 2009 and 2011. Predictions based on these simple indices can be used to support regional forecasting efforts and land surface data assimilations to help inform early warning and guide climate outlooks.
Published: 2014
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5. Analysis of a Short-Term and a Seasonal Precipitation Forecast Over Kenya

Author: Emily Adams, Vikalp Mishra, Ashutosh Limaye, Robert Griffin, Sara Miller, J. B. Roberts, and W. Lee Ellenburg
Subjects: Wet season, Atmospheric Science, rainfall onset, forecast assessment, business.industry, Forecast skill, Vegetation, Environmental Science (miscellaneous), Kenya, Water security, seasonal forecast, Agriculture, Climatology, Meteorology. Climatology, Quantitative precipitation forecast, Environmental science, Precipitation, Predictability, QC851-999, business
Abstract: Kenya is highly dependent on precipitation for both food and water security. Farmers and pastoralists rely on rain to provide water for crops and vegetation to feed herds. As such, precipitation forecasts can be useful tools to inform decision makers and potentially allow the preparation for such events as drought. This study assessed the predictability of a seasonal forecast (CFSv2) and a short-term precipitation forecast (CHIRPS-GEFS) over Kenya. The short-term forecast was assessed on its ability to predict the onset date of the rainy season, and the skill of the seasonal forecast in predicting abnormal precipitation patterns. CHIRPS-GEFS provided a useful starting point to estimate the onset date, but during the long rains in the southwest, where agriculture is concentrated, differences between the predicted and actual onset dates were large (over 20 days). Assessments for CFSv2 generally displayed lower forecast skill over highlands and coastal regions at a seasonal scale. The CFSv2 forecast skill varied widely over individual months and lead times, but over whole rainy seasons, CFSv2 was more skillful than a random forecast at all lead times in the major agricultural areas of Kenya. This research fills a critical research and application gap in understanding the forecast precipitation skill for onset and sub-seasonal prediction.
Published: 2021
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6. Assimilation of GPM-retrieved Ocean Surface Meteorology Data for Two Snowstorm Events during ICE-POP 2018

Author: Xuanli Li, Christopher Hain, Jonathan L. Case, Walter A. Petersen, Jayanthi Srikishen, GyuWon Lee, and J. B. Roberts
Subjects: Data assimilation, Meteorology, Weather Research and Forecasting Model, Quantitative precipitation forecast, Winter storm, Environmental science, General Medicine, Numerical weather prediction, Snow, Global Precipitation Measurement, Wind speed
Abstract: As a component of the National Aeronautics and Space Administration's (NASA's) Weather Focus Area and Global Precipitation Measurement (GPM) Ground Validation participation in the International Collaborative Experiments for the PyeongChang 2018 Olympic and Paralympic Winter Games' (ICE-POP 2018) field research and forecast demonstration programs, hourly ocean surface meteorology properties were retrieved from the GPM microwave observations for January–March 2018. In this study, the retrieved ocean surface meteorological products – 2 m temperature, 2 m specific humidity, and 10 m wind speed – were assimilated into a regional numerical weather prediction (NWP) framework. This explored the application of these observations for two heavy snowfall events during the ICE-POP 2018, on 27–28 February and 7–8 March 2018. The Weather Research and Forecasting (WRF) model and the community Gridpoint Statistical Interpolation (GSI) were used to conduct high-resolution simulations and data assimilation experiments. The results indicate that the data assimilation has a large influence on surface thermodynamic and wind fields in the model initial condition for both events. With cycled data assimilation, a significantly positive influence of the retrieved surface observation was found for the March case, with improved quantitative precipitation forecasts and reduced errors in temperature forecasts. A slightly smaller yet positive impact was also found in the forecast for the February case.
Published: 2021

7. Detecting Desert Locust Breeding Grounds: A Satellite-Assisted Modeling Approach

Author: Jonathan L. Case, J. B. Roberts, Keith Cressman, Water Lee Ellenburg, Clay Blankenship, Ashutosh Limaye, and Vikalp Mishra
Subjects: desert locust, 010504 meteorology & atmospheric sciences, Soil texture, Science, 0211 other engineering and technologies, 02 engineering and technology, 01 natural sciences, Soil moisture content, Desert locust, Water content, 021101 geological & geomatics engineering, 0105 earth and related environmental sciences, biology, Moisture, business.industry, modeling, biology.organism_classification, Agronomy, Agriculture, General Earth and Planetary Sciences, Environmental science, Satellite, soil moisture, business, Locust
Abstract: The objective of this study is to evaluate the ability of soil physical characteristics (i.e., texture and moisture conditions) to better understand the breeding conditions of desert locust (DL). Though soil moisture and texture are well-known and necessary environmental conditions for DL breeding, in this study, we highlight the ability of model-derived soil moisture estimates to contribute towards broader desert locust monitoring activities. We focus on the recent DL upsurge in East Africa from October 2019 though June 2020, utilizing known locust observations from the United Nations Food and Agriculture Organization (FAO). We compare this information to results from the current literature and combine the two datasets to create “optimal thresholds” of breeding conditions. When considering the most optimal conditions (all thresholds met), the soil texture combined with modeled soil moisture content predicted the estimated DL egg-laying period 62.5% of the time. Accounting for the data errors and uncertainties, a 3 × 3 pixel buffer increased this to 85.2%. By including soil moisture, the areas of optimal egg laying conditions decreased from 33% to less than 20% on average.
Published: 2021

8. Uncertainties in Ocean Latent Heat Flux Variations over Recent Decades in Satellite-Based Estimates and Reduced Observation Reanalyses

Author: Marc Schröder, J. B. Roberts, Gilbert P. Compo, Lucrezia Ricciardulli, Karsten Fennig, Michael G. Bosilovich, Franklin R. Robertson, Hiroyuki Tomita, Hans Hersbach, Carol Anne Clayson, Marloes Gutenstein, Chiaki Kobayashi, Prashant D. Sardeshmukh, Laura C. Slivinski, and Abderrahim Bentamy
Subjects: Atmospheric Science, 010504 meteorology & atmospheric sciences, 13. Climate action, Latent heat, Climatology, Environmental science, Satellite, 14. Life underwater, 010502 geochemistry & geophysics, 01 natural sciences, 0105 earth and related environmental sciences
Abstract: Four state-of-the-art satellite-based estimates of ocean surface latent heat fluxes (LHFs) extending over three decades are analyzed, focusing on the interannual variability and trends of near-global averages and regional patterns. Detailed intercomparisons are made with other datasets including 1) reduced observation reanalyses (RedObs) whose exclusion of satellite data renders them an important independent diagnostic tool; 2) a moisture budget residual LHF estimate using reanalysis moisture transport, atmospheric storage, and satellite precipitation; 3) the ECMWF Reanalysis 5 (ERA5); 4) Remote Sensing Systems (RSS) single-sensor passive microwave and scatterometer wind speed retrievals; and 5) several sea surface temperature (SST) datasets. Large disparities remain in near-global satellite LHF trends and their regional expression over the 1990–2010 period, during which time the interdecadal Pacific oscillation changed sign. The budget residual diagnostics support the smaller RedObs LHF trends. The satellites, ERA5, and RedObs are reasonably consistent in identifying contributions by the 10-m wind speed variations to the LHF trend patterns. However, contributions by the near-surface vertical humidity gradient from satellites and ERA5 trend upward in time with respect to the RedObs ensemble and show less agreement in trend patterns. Problems with wind speed retrievals from Special Sensor Microwave Imager/Sounder satellite sensors, excessive upward trends in trends in Optimal Interpolation Sea Surface Temperature (OISST AVHRR-Only) data used in most satellite LHF estimates, and uncertainties associated with poor satellite coverage before the mid-1990s are noted. Possibly erroneous trends are also identified in ERA5 LHF associated with the onset of scatterometer wind data assimilation in the early 1990s.
Published: 2020

9. Reconciling land / ocean moisture transport variability in reanalyses with P-ET in observationally-driven land surface models

Author: Michael G. Bosilovich, J. B. Roberts, and Franklin R. Robertson
Subjects: Atmospheric Science, 010504 meteorology & atmospheric sciences, Moisture, Rain gauge, Hydrological modelling, 0208 environmental biotechnology, Flux, 02 engineering and technology, Atmospheric sciences, 01 natural sciences, Article, 020801 environmental engineering, Data assimilation, Evapotranspiration, Climatology, Environmental science, Satellite, Precipitation, 0105 earth and related environmental sciences
Abstract: Vertically integrated atmospheric moisture transport from ocean to land [vertically integrated atmospheric moisture flux convergence (VMFC)] is a dynamic component of the global climate system but remains problematic in atmospheric reanalyses, with current estimates having significant multidecadal global trends differing even in sign. Continual evolution of the global observing system, particularly stepwise improvements in satellite observations, has introduced discrete changes in the ability of data assimilation to correct systematic model biases, manifesting as nonphysical variability. Land surface models (LSMs) forced with observed precipitation P and near-surface meteorology and radiation provide estimates of evapotranspiration (ET). Since variability of atmospheric moisture storage is small on interannual and longer time scales, VMFC = P − ET is a good approximation and LSMs can provide an alternative estimate. However, heterogeneous density of rain gauge coverage, especially the sparse coverage over tropical continents, remains a serious concern. Rotated principal component analysis (RPCA) with prefiltering of VMFC to isolate the artificial variability is used to investigate artifacts in five reanalysis systems. This procedure, although ad hoc, enables useful VMFC corrections over global land. The P − ET estimates from seven different LSMs are evaluated and subsequently used to confirm the efficacy of the RPCA-based adjustments. Global VMFC trends over the period 1979–2012 ranging from 0.07 to −0.03 mm day−1 decade−1 are reduced by the adjustments to 0.016 mm day−1 decade−1, much closer to the LSM P − ET estimate (0.007 mm day−1 decade−1). Neither is significant at the 90% level. ENSO-related modulation of VMFC and P − ET remains the largest global interannual signal, with mean LSM and adjusted reanalysis time series correlating at 0.86.
Published: 2020

10. Using Kinaesthetic Exertion to Engender Team Psychological Safety in UK Higher Education

Author: Ioanna Iordanou and Ashley J. B. Roberts
Subjects: Higher education, business.industry, Physical performance, Intervention (counseling), Applied psychology, ComputingMilieux_COMPUTERSANDEDUCATION, Normative, Psychological safety, Space (commercial competition), business, Psychology, The arts
Abstract: This chapter is based on educating UK Undergraduate Business School students with the opportunities afforded by an Open Space Learning (OSL) environment. Our use of the Arts-based Intervention (ABI) of physical performance challenges normative Business School pedagogy that has been claimed to reduce students to becoming “voracious copy machines” (Beghetto and Kauffman 2009, p. 300).
Published: 2019

11. Measurements of dihadron correlations relative to the event plane in Au+Au collisions at GeV *

Author: H. Agakishiev, M. M. Aggarwal, Z. Ahammed, A. V. Alakhverdyants, I. Alekseev, J. Alford, B. D. Anderson, C. D. Anson, D. Arkhipkin, G. S. Averichev, J. Balewski, D. R. Beavis, N. K. Behera, R. Bellwied, M. J. Betancourt, R. R. Betts, A. Bhasin, A. K. Bhati, H. Bichsel, J. Bielcik, J. Bielcikova, B. Biritz, L. C. Bland, W. Borowski, J. Bouchet, E. Braidot, A. V. Brandin, A. Bridgeman, S. G. Brovko, E. Bruna, S. Bueltmann, I. Bunzarov, T. P. Burton, X. Z. Cai, H. Caines, M. Calderón de la Barca Sánchez, D. Cebra, R. Cendejas, M. C. Cervantes, Z. Chajecki, P. Chaloupka, S. Chattopadhyay, H. F. Chen, J. H. Chen, J. Y. Chen, L. Chen, J. Cheng, M. Cherney, A. Chikanian, K. E. Choi, W. Christie, P. Chung, M. J. M. Codrington, R. Corliss, J. G. Cramer, H. J. Crawford, S. Dash, A. Davila Leyva, L. C. De Silva, R. R. Debbe, T. G. Dedovich, A. A. Derevschikov, R. Derradi de Souza, L. Didenko, P. Djawotho, S. M. Dogra, X. Dong, J. L. Drachenberg, J. E. Draper, J. C. Dunlop, L. G. Efimov, M. Elnimr, J. Engelage, G. Eppley, M. Estienne, L. Eun, O. Evdokimov, R. Fatemi, J. Fedorisin, A. Feng, R. G. Fersch, P. Filip, E. Finch, V. Fine, Y. Fisyak, C. A. Gagliardi, D. R. Gangadharan, A. Geromitsos, F. Geurts, P. Ghosh, Y. N. Gorbunov, A. Gordon, O. Grebenyuk, D. Grosnick, S. M. Guertin, A. Gupta, W. Guryn, B. Haag, O. Hajkova, A. Hamed, L-X. Han, J. W. Harris, J. P. Hays-Wehle, M. Heinz, S. Heppelmann, A. Hirsch, E. Hjort, G. W. Hoffmann, D. J. Hofman, B. Huang, H. Z. Huang, T. J. Humanic, L. Huo, G. Igo, P. Jacobs, W. W. Jacobs, C. Jena, F. Jin, J. Joseph, E. G. Judd, S. Kabana, K. Kang, J. Kapitan, K. Kauder, H. Ke, D. Keane, A. Kechechyan, D. Kettler, D. P. Kikola, J. Kiryluk, A. Kisiel, V. Kizka, A. G. Knospe, D. D. Koetke, T. Kollegger, J. Konzer, I. Koralt, L. Koroleva, W. Korsch, L. Kotchenda, V. Kouchpil, P. Kravtsov, K. Krueger, M. Krus, L. Kumar, P. Kurnadi, M. A. C. Lamont, J. M. Landgraf, S. LaPointe, J. Lauret, A. Lebedev, R. Lednicky, J. H. Lee, W. Leight, M. J. LeVine, C. Li, L. Li, N. Li, W. Li, X. Li, Y. Li, Z. M. Li, M. A. Lisa, F. Liu, H. Liu, J. Liu, T. Ljubicic, W. J. Llope, R. S. Longacre, W. A. Love, Y. Lu, E. V. Lukashov, X. Luo, G. L. Ma, Y. G. Ma, D. P. Mahapatra, R. Majka, O. I. Mall, L. K. Mangotra, R. Manweiler, S. Margetis, C. Markert, H. Masui, H. S. Matis, Yu. A. Matulenko, D. McDonald, T. S. McShane, A. Meschanin, R. Milner, N. G. Minaev, S. Mioduszewski, A. Mischke, M. K. Mitrovski, B. Mohanty, M. M. Mondal, B. Morozov, D. A. Morozov, M. G. Munhoz, M. Naglis, B. K. Nandi, T. K. Nayak, P. K. Netrakanti, L. V. Nogach, S. B. Nurushev, G. Odyniec, A. Ogawa, null Oh, null Ohlson, V. Okorokov, E. W. Oldag, D. Olson, M. Pachr, B. S. Page, S. K. Pal, Y. Pandit, Y. Panebratsev, T. Pawlak, H. Pei, T. Peitzmann, C. Perkins, W. Peryt, S. C. Phatak, P. Pile, M. Planinic, M. A. Ploskon, J. Pluta, D. Plyku, N. Poljak, A. M. Poskanzer, B. V. K. S. Potukuchi, C. B. Powell, D. Prindle, N. K. Pruthi, P. R. Pujahari, J. Putschke, H. Qiu, R. Raniwala, S. Raniwala, R. L. Ray, R. Redwine, R. Reed, H. G. Ritter, J. B. Roberts, O. V. Rogachevskiy, J. L. Romero, A. Rose, L. Ruan, J. Rusnak, N. R. Sahoo, S. Sakai, I. Sakrejda, T. Sakuma, S. Salur, J. Sandweiss, E. Sangaline, A. Sarkar, J. Schambach, R. P. Scharenberg, A. M. Schmah, N. Schmitz, T. R. Schuster, J. Seele, J. Seger, I. Selyuzhenkov, P. Seyboth, E. Shahaliev, M. Shao, M. Sharma, S. S. Shi, Q. Y. Shou, E. P. Sichtermann, F. Simon, R. N. Singaraju, M. J. Skoby, N. Smirnov, H. M. Spinka, B. Srivastava, T. D. S. Stanislaus, D. Staszak, S. G. Steadman, J. R. Stevens, R. Stock, M. Strikhanov, B. Stringfellow, A. A. P. Suaide, M. C. Suarez, N. L. Subba, M. Sumbera, X. M. Sun, Y. Sun, Z. Sun, B. Surrow, D. N. Svirida, T. J. M. Symons, A. Szanto de Toledo, J. Takahashi, A. H. Tang, Z. Tang, L. H. Tarini, T. Tarnowsky, D. Thein, J. H. Thomas, J. Tian, A. R. Timmins, D. Tlusty, M. Tokarev, V. N. Tram, S. Trentalange, R. E. Tribble, null Tribedy, O. D. Tsai, T. Ullrich, D. G. Underwood, G. Van Buren, G. van Nieuwenhuizen, J. A. Vanfossen, Jr., R. Varma, G. M. S. Vasconcelos, A. N. Vasiliev, F. Videbæk, Y. P. Viyogi, S. Vokal, M. Wada, M. Walker, F. Wang, G. Wang, H. Wang, J. S. Wang, Q. Wang, X. L. Wang, Y. Wang, G. Webb, J. C. Webb, G. D. Westfall, C. Whitten Jr., H. Wieman, S. W. Wissink, R. Witt, W. Witzke, Y. F. Wu, null Xiao, W. Xie, H. Xu, N. Xu, Q. H. Xu, W. Xu, Y. Xu, Z. Xu, L. Xue, Y. Yang, P. Yepes, K. Yip, I-K. Yoo, M. Zawisza, H. Zbroszczyk, W. Zhan, J. B. Zhang, S. Zhang, W. M. Zhang, X. P. Zhang, Y. Zhang, Z. P. Zhang, J. Zhao, C. Zhong, W. Zhou, X. Zhu, Y. H. Zhu, R. Zoulkarneev, and Y. Zoulkarneeva
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Star (game theory), Elliptic flow, Zero (complex analysis), Astronomy and Astrophysics, Parton, Correlation function (quantum field theory), Nuclear matter, 01 natural sciences, 0103 physical sciences, 010306 general physics, Jet quenching, Centrality, Instrumentation
Abstract: Dihadron azimuthal correlations containing a high transverse momentum ( ) trigger particle are sensitive to the properties of the nuclear medium created at RHIC through the strong interactions occurring between the traversing parton and the medium, i.e. jet-quenching. Previous measurements revealed a strong modification to dihadron azimuthal correlations in Au+Au collisions with respect to p+p and d+Au collisions. The modification increases with the collision centrality, suggesting a path-length or energy density dependence to the jet-quenching effect. This paper reports STAR measurements of dihadron azimuthal correlations in mid-central (20%-60%) Au+Au collisions at GeV as a function of the trigger particle's azimuthal angle relative to the event plane, . The azimuthal correlation is studied as a function of both the trigger and associated particle . The subtractions of the combinatorial background and anisotropic flow, assuming Zero Yield At Minimum (ZYAM), are described. The correlation results are first discussed with subtraction of the even harmonic (elliptic and quadrangular) flow backgrounds. The away-side correlation is strongly modified, and the modification varies with , with a double-peak structure for out-of-plane trigger particles. The near-side ridge (long range pseudo-rapidity correlation) appears to drop with increasing while the jet-like component remains approximately constant. The correlation functions are further studied with the subtraction of odd harmonic triangular flow background arising from fluctuations. It is found that the triangular flow, while responsible for the majority of the amplitudes, is not sufficient to explain the -dependence of the ridge or the away-side double-peak structure. The dropping ridge with could be attributed to a -dependent elliptic anisotropy; however, the physics mechanism of the ridge remains an open question. Even with a -dependent elliptic flow, the away-side correlation structure is robust. These results, with extensive systematic studies of the dihadron correlations as a function of , trigger and associated particle , and the pseudo-rapidity range , should provide stringent inputs to help understand the underlying physics mechanisms of jet-medium interactions in high energy nuclear collisions.
Published: 2021

12. Predicting East African spring droughts using Pacific and Indian Ocean sea surface temperature indices

Author: Gregory Husak, J. B. Roberts, Shraddhanand Shukla, Franklin R. Robertson, Chris Funk, Andrew Hoell, Brant Liebmann, and Ileana Bladé
Subjects: lcsh:GE1-350, Wet season, Agricultural development, geography.geographical_feature_category, Disaster risk reduction, lcsh:T, lcsh:Geography. Anthropology. Recreation, lcsh:Technology, lcsh:TD1-1066, Indian ocean, Sea surface temperature, Geography, lcsh:G, Climatology, Spring (hydrology), East africa, Walker circulation, lcsh:Environmental technology. Sanitary engineering, lcsh:Environmental sciences
Abstract: In eastern East Africa (the southern Ethiopia, eastern Kenya and southern Somalia region), poor boreal spring (long wet season) rains in 1999, 2000, 2004, 2007, 2008, 2009, and 2011 contributed to severe food insecurity and high levels of malnutrition. Predicting rainfall deficits in this region on seasonal and decadal time frames can help decision makers implement disaster risk reduction measures while guiding climate-smart adaptation and agricultural development. Building on recent research that links more frequent East African droughts to a stronger Walker circulation, resulting from warming in the Indo–Pacific warm pool and an increased east-to-west sea surface temperature (SST) gradient in the western Pacific, we show that the two dominant modes of East African boreal spring rainfall variability are tied to SST fluctuations in the western central Pacific and central Indian Ocean, respectively. Variations in these two rainfall modes can thus be predicted using two SST indices – the western Pacific gradient (WPG) and central Indian Ocean index (CIO), with our statistical forecasts exhibiting reasonable cross-validated skill (rcv ≈ 0.6). In contrast, the current generation of coupled forecast models show no skill during the long rains. Our SST indices also appear to capture most of the major recent drought events such as 2000, 2009 and 2011. Predictions based on these simple indices can be used to support regional forecasting efforts and land surface data assimilations to help inform early warning and guide climate outlooks.
Published: 2014

13. Consistency of Estimated Global Water Cycle Variations over the Satellite Era

Author: Michael G. Bosilovich, J. B. Roberts, Franklin R. Robertson, Lucrezia Ricciardulli, Robert F. Adler, Wesley Berg, George J. Huffman, and Rolf H. Reichle
Subjects: Atmospheric Science, Sea surface temperature, La Niña, Water balance, Climatology, Evapotranspiration, Environmental science, Satellite, Precipitation, Water cycle, Atmospheric sciences, Pacific decadal oscillation
Abstract: Motivated by the question of whether recent interannual to decadal climate variability and a possible “climate shift” may have affected the global water balance, we examine precipitation minus evaporation (P – E) variability integrated over the global oceans and global land for the period 1979–2010 from three points of view—remotely sensed retrievals and syntheses over the oceans, reanalysis vertically integrated moisture flux convergence (VMFC) over land, and land surface models (LSMs) forced with observations-based precipitation, radiation, and near-surface meteorology. Over land, reanalysis VMFC and P − evapotranspiration (ET) from observationally forced LSMs agree on interannual variations (e.g., El Niño/La Niña events); however, reanalyses exhibit upward VMFC trends 3–4 times larger than P − ET trends of the LSMs. Experiments with other reanalyses using reduced observations show that upward VMFC trends in the full reanalyses are due largely to observing system changes interacting with assimilation model physics. The much smaller P − ET trend in the LSMs appears due to changes in frequency and amplitude of warm events after the 1997/98 El Niño, a result consistent with coolness in the eastern tropical Pacific sea surface temperature (SST) after that date. When integrated over the global oceans, E and especially P variations show consistent signals of El Niño/La Niña events. However, at scales longer than interannual there is considerable uncertainty especially in E. This results from differences among datasets in near-surface atmospheric specific humidity and wind speed used in bulk aerodynamic retrievals. The P variations, all relying substantially on passive microwave retrievals over ocean, also have uncertainties in decadal variability, but to a smaller degree.
Published: 2014

14. Intraseasonal Variability in MERRA Energy Fluxes over the Tropical Oceans

Author: Franklin R. Robertson and J. B. Roberts
Subjects: Troposphere, Cloud forcing, Atmospheric Science, Radiative flux, Data assimilation, Anomaly (natural sciences), Climatology, Radiative transfer, Environmental science, Madden–Julian oscillation, Precipitation, Atmospheric sciences
Abstract: This paper investigates intraseasonal variability as represented by the recent NASA Global Modeling and Assimilation Office (GMAO) reanalysis, the Modern-Era Retrospective analysis for Research and Applications (MERRA). The authors examine the behavior of heat, moisture, and radiative fluxes emphasizing their contribution to intraseasonal variations in heat and moisture balance integrated over the tropical oceans. MERRA successfully captures intraseasonal signals in both state variables and fluxes, though it depends heavily on the analysis increment update terms that constrain the reanalysis to be near the observations. Precipitation anomaly patterns evolve in close agreement with those from the Tropical Rainfall Measuring Mission (TRMM) though locally MERRA may occasionally be smaller by up to 20%. As in the TRMM observations, tropical convection increases lead tropospheric warming by approximately 7 days. Radiative flux anomalies are dominated by cloud forcing and are found to replicate the top-of-the-atmosphere (TOA) energy loss associated with increased convection found by other observationally based studies. However, MERRA’s convectively produced clouds appear to deepen too soon as precipitation increases. Total fractional cloud cover variations appear somewhat weak compared to observations from the Moderate Resolution Imaging Spectroradiometer (MODIS). Evolution of the surface fluxes, convection, and TOA radiation is consistent with the “discharge–recharge” paradigm that posits the importance of lower-tropospheric moisture accumulation prior to the expansion of organized deep convection. The authors conclude that MERRA constitutes a very useful representation of intraseasonal variability that will support a variety of studies concerning radiative–convective–dynamical processes and will help identify pathways for improved moist physical parameterization in global models.
Published: 2012

15. Effects of temperature variation on suicide in five U.S. counties, 1991–2001

Author: J. B. Roberts, M. R. Holley, D. D. Inman, P. G. Dixon, A. N. McDonald, W. M. Carter, J. S. Allen, J. E. Stapleton, and K. N. Scheitlin
Subjects: Male, Atmospheric Science, Climate, Health, Toxicology and Mutagenesis, Annual average, Poison control, Suicide rates, Suicide prevention, medicine, Forensic engineering, Humans, Weather, Ecology, Spring season, Temperature, Linear model, Seasonality, medicine.disease, United States, Suicide, Geography, Linear Models, Female, Seasons, Simple linear regression, Demography
Abstract: Effects of weather variables on suicide are well-documented, but there is still little consistency among the results of most studies. Nevertheless, most studies show a peak in suicides during the spring season, and this is often attributed to increased temperatures. The purpose of this study is to test the relationship between monthly temperature and monthly suicide, independent of months or seasons, for five counties located across the United States. Harmonic analysis shows that four of the five counties display some seasonal components in the suicide data. However, simple linear regression shows no correlation between suicide and temperature, and discriminant analysis shows that monthly departure from mean annual suicide rates is not a useful tool for identifying months with temperatures that are colder or warmer than the annual average. Therefore, it appears that the seasonality of suicides is due to factors other than temperature.
Published: 2007

16. Λ Λ correlation function in Au+Au collisions at sNN =200GeV

Author: L, Adamczyk, J K, Adkins, G, Agakishiev, M M, Aggarwal, Z, Ahammed, I, Alekseev, J, Alford, C D, Anson, A, Aparin, D, Arkhipkin, E C, Aschenauer, G S, Averichev, A, Banerjee, D R, Beavis, R, Bellwied, A, Bhasin, A K, Bhati, P, Bhattarai, H, Bichsel, J, Bielcik, J, Bielcikova, L C, Bland, I G, Bordyuzhin, W, Borowski, J, Bouchet, A V, Brandin, S G, Brovko, S, Bültmann, I, Bunzarov, T P, Burton, J, Butterworth, H, Caines, M, Calderón de la Barca Sánchez, J M, Campbell, D, Cebra, R, Cendejas, M C, Cervantes, P, Chaloupka, Z, Chang, S, Chattopadhyay, H F, Chen, J H, Chen, L, Chen, J, Cheng, M, Cherney, A, Chikanian, W, Christie, J, Chwastowski, M J M, Codrington, G, Contin, J G, Cramer, H J, Crawford, X, Cui, S, Das, A, Davila Leyva, L C, De Silva, R R, Debbe, T G, Dedovich, J, Deng, A A, Derevschikov, R, Derradi de Souza, B, di Ruzza, L, Didenko, C, Dilks, F, Ding, P, Djawotho, X, Dong, J L, Drachenberg, J E, Draper, C M, Du, L E, Dunkelberger, J C, Dunlop, L G, Efimov, J, Engelage, K S, Engle, G, Eppley, L, Eun, O, Evdokimov, O, Eyser, R, Fatemi, S, Fazio, J, Fedorisin, P, Filip, Y, Fisyak, C E, Flores, C A, Gagliardi, D R, Gangadharan, D, Garand, F, Geurts, A, Gibson, M, Girard, S, Gliske, L, Greiner, D, Grosnick, D S, Gunarathne, Y, Guo, A, Gupta, S, Gupta, W, Guryn, B, Haag, A, Hamed, L-X, Han, R, Haque, J W, Harris, S, Heppelmann, A, Hirsch, G W, Hoffmann, D J, Hofman, S, Horvat, B, Huang, H Z, Huang, X, Huang, P, Huck, T J, Humanic, G, Igo, W W, Jacobs, H, Jang, E G, Judd, S, Kabana, D, Kalinkin, K, Kang, K, Kauder, H W, Ke, D, Keane, A, Kechechyan, A, Kesich, Z H, Khan, D P, Kikola, I, Kisel, A, Kisiel, D D, Koetke, T, Kollegger, J, Konzer, I, Koralt, L K, Kosarzewski, L, Kotchenda, A F, Kraishan, P, Kravtsov, K, Krueger, I, Kulakov, L, Kumar, R A, Kycia, M A C, Lamont, J M, Landgraf, K D, Landry, J, Lauret, A, Lebedev, R, Lednicky, J H, Lee, C, Li, W, Li, X, Li, Y, Li, Z M, Li, M A, Lisa, F, Liu, T, Ljubicic, W J, Llope, M, Lomnitz, R S, Longacre, X, Luo, G L, Ma, Y G, Ma, D P, Mahapatra, R, Majka, S, Margetis, C, Markert, H, Masui, H S, Matis, D, McDonald, T S, McShane, N G, Minaev, S, Mioduszewski, B, Mohanty, M M, Mondal, D A, Morozov, M K, Mustafa, B K, Nandi, Md, Nasim, T K, Nayak, J M, Nelson, G, Nigmatkulov, L V, Nogach, S Y, Noh, J, Novak, S B, Nurushev, G, Odyniec, A, Ogawa, K, Oh, A, Ohlson, V, Okorokov, E W, Oldag, D L, Olvitt, B S, Page, Y X, Pan, Y, Pandit, Y, Panebratsev, T, Pawlak, B, Pawlik, H, Pei, C, Perkins, P, Pile, M, Planinic, J, Pluta, N, Poljak, K, Poniatowska, J, Porter, A M, Poskanzer, N K, Pruthi, M, Przybycien, J, Putschke, H, Qiu, A, Quintero, S, Ramachandran, R, Raniwala, S, Raniwala, R L, Ray, C K, Riley, H G, Ritter, J B, Roberts, O V, Rogachevskiy, J L, Romero, J F, Ross, A, Roy, L, Ruan, J, Rusnak, O, Rusnakova, N R, Sahoo, P K, Sahu, I, Sakrejda, S, Salur, J, Sandweiss, E, Sangaline, A, Sarkar, J, Schambach, R P, Scharenberg, A M, Schmah, W B, Schmidke, N, Schmitz, J, Seger, P, Seyboth, N, Shah, E, Shahaliev, P V, Shanmuganathan, M, Shao, B, Sharma, W Q, Shen, S S, Shi, Q Y, Shou, E P, Sichtermann, M, Simko, M J, Skoby, D, Smirnov, N, Smirnov, D, Solanki, P, Sorensen, H M, Spinka, B, Srivastava, T D S, Stanislaus, J R, Stevens, R, Stock, M, Strikhanov, B, Stringfellow, M, Sumbera, X, Sun, X M, Sun, Y, Sun, Z, Sun, B, Surrow, D N, Svirida, T J M, Symons, M A, Szelezniak, J, Takahashi, A H, Tang, Z, Tang, T, Tarnowsky, J H, Thomas, A R, Timmins, D, Tlusty, M, Tokarev, S, Trentalange, R E, Tribble, P, Tribedy, B A, Trzeciak, O D, Tsai, J, Turnau, T, Ullrich, D G, Underwood, G, Van Buren, G, van Nieuwenhuizen, M, Vandenbroucke, J A, Vanfossen, R, Varma, G M S, Vasconcelos, A N, Vasiliev, R, Vertesi, F, Videbæk, Y P, Viyogi, S, Vokal, A, Vossen, M, Wada, F, Wang, G, Wang, H, Wang, J S, Wang, X L, Wang, Y, Wang, G, Webb, J C, Webb, G D, Westfall, H, Wieman, S W, Wissink, R, Witt, Y F, Wu, Z, Xiao, W, Xie, K, Xin, H, Xu, J, Xu, N, Xu, Q H, Xu, Y, Xu, Z, Xu, W, Yan, C, Yang, Y, Yang, Z, Ye, P, Yepes, L, Yi, K, Yip, I-K, Yoo, N, Yu, H, Zbroszczyk, W, Zha, J B, Zhang, J L, Zhang, S, Zhang, X P, Zhang, Y, Zhang, Z P, Zhang, F, Zhao, J, Zhao, C, Zhong, X, Zhu, Y H, Zhu, Y, Zoulkarneeva, M, Zyzak, Adamczyk, L., Adkins, J. K., Agakishiev, G., Aggarwal, M. M., Ahammed, Z., Alekseev, I., Alford, J., Anson, C. D., Aparin, A., Arkhipkin, D., Aschenauer, E. C., Averichev, G. S., Banerjee, A., Beavis, D. R., Bellwied, R., Bhasin, A., Bhati, A. K., Bhattarai, P., Bichsel, H., Bielcik, J., Bielcikova, J., Bland, L. C., Bordyuzhin, I. G., Borowski, W., Bouchet, J., Brandin, A. V., Brovko, S. G., Bültmann, S., Bunzarov, I., Burton, T. P., Butterworth, J., Caines, H., Calderón De La Barca Sánchez, M., Campbell, J. M., Cebra, D., Cendejas, R., Cervantes, M. C., Chaloupka, P., Chang, Z., Chattopadhyay, S., Chen, H. F., Chen, J. H., Chen, L., Cheng, J., Cherney, M., Chikanian, A., Christie, W., Chwastowski, J., Codrington, M. J. M., Contin, G., Cramer, J. G., Crawford, H. J., Cui, X., Das, S., Davila Leyva, A., De Silva, L. C., Debbe, R. R., Dedovich, T. G., Deng, J., Derevschikov, A. A., Derradi De Souza, R., Di Ruzza, B., Didenko, L., Dilks, C., Ding, F., Djawotho, P., Dong, X., Drachenberg, J. L., Draper, J. E., Du, C. M., Dunkelberger, L. E., Dunlop, J. C., Efimov, L. G., Engelage, J., Engle, K. S., Eppley, G., Eun, L., Evdokimov, O., Eyser, O., Fatemi, R., Fazio, S., Fedorisin, J., Filip, P., Fisyak, Y., Flores, C. E., Gagliardi, C. A., Gangadharan, D. R., Garand, D., Geurts, F., Gibson, A., Girard, M., Gliske, S., Greiner, L., Grosnick, D., Gunarathne, D. S., Guo, Y., Gupta, A., Gupta, S., Guryn, W., Haag, B., Hamed, A., Han, L. -X., Haque, R., Harris, J. W., Heppelmann, S., Hirsch, A., Hoffmann, G. W., Hofman, D. J., Horvat, S., Huang, B., Huang, H. Z., Huang, X., Huck, P., Humanic, T. J., Igo, G., Jacobs, W. W., Jang, H., Judd, E. G., Kabana, S., Kalinkin, D., Kang, K., Kauder, K., Ke, H. W., Keane, D., Kechechyan, A., Kesich, A., Khan, Z. H., Kikola, D. P., Kisel, I., Kisiel, A., Koetke, D. D., Kollegger, T., Konzer, J., Koralt, I., Kosarzewski, L. K., Kotchenda, L., Kraishan, A. F., Kravtsov, P., Krueger, K., Kulakov, I., Kumar, L., Kycia, R. A., Lamont, M. A. C., Landgraf, J. M., Landry, K. D., Lauret, J., Lebedev, A., Lednicky, R., Lee, J. H., Li, C., Li, W., Li, X., Li, Y., Li, Z. M., Lisa, M. A., Liu, F., Ljubicic, T., Llope, W. J., Lomnitz, M., Longacre, R. S., Luo, X., Ma, G. L., Ma, Y. G., Mahapatra, D. P., Majka, R., Margetis, S., Markert, C., Masui, H., Matis, H. S., Mcdonald, D., Mcshane, T. S., Minaev, N. G., Mioduszewski, S., Mohanty, B., Mondal, M. M., Morozov, D. A., Mustafa, M. K., Nandi, B. K., Nasim, Md., Nayak, T. K., Nelson, J. M., Nigmatkulov, G., Nogach, L. V., Noh, S. Y., Novak, J., Nurushev, S. B., Odyniec, G., Ogawa, A., Oh, K., Ohlson, A., Okorokov, V., Oldag, E. W., Olvitt, D. L., Page, B. S., Pan, Y. X., Pandit, Y., Panebratsev, Y., Pawlak, T., Pawlik, B., Pei, H., Perkins, C., Pile, P., Planinic, M., Pluta, J., Poljak, N., Poniatowska, K., Porter, J., Poskanzer, A. M., Pruthi, N. K., Przybycien, M., Putschke, J., Qiu, H., Quintero, A., Ramachandran, S., Raniwala, R., Raniwala, S., Ray, R. L., Riley, C. K., Ritter, H. G., Roberts, J. B., Rogachevskiy, O. V., Romero, J. L., Ross, J. F., Roy, A., Ruan, L., Rusnak, J., Rusnakova, O., Sahoo, N. R., Sahu, P. K., Sakrejda, I., Salur, S., Sandweiss, J., Sangaline, E., Sarkar, A., Schambach, J., Scharenberg, R. P., Schmah, A. M., Schmidke, W. B., Schmitz, N., Seger, J., Seyboth, P., Shah, N., Shahaliev, E., Shanmuganathan, P. V., Shao, M., Sharma, B., Shen, W. Q., Shi, S. S., Shou, Q. Y., Sichtermann, E. P., Simko, M., Skoby, M. J., Smirnov, D., Smirnov, N., Solanki, D., Sorensen, P., Spinka, H. M., Srivastava, B., Stanislaus, T. D. S., Stevens, J. R., Stock, R., Strikhanov, M., Stringfellow, B., Sumbera, M., Sun, X., Sun, X. M., Sun, Y., Sun, Z., Surrow, B., Svirida, D. N., Symons, T. J. M., Szelezniak, M. A., Takahashi, J., Tang, A. H., Tang, Z., Tarnowsky, T., Thomas, J. H., Timmins, A. R., Tlusty, D., Tokarev, M., Trentalange, S., Tribble, R. E., Tribedy, P., Trzeciak, B. A., Tsai, O. D., Turnau, J., Ullrich, T., Underwood, D. G., Van Buren, G., Van Nieuwenhuizen, G., Vandenbroucke, M., Vanfossen, J. A., Varma, R., Vasconcelos, G. M. S., Vasiliev, A. N., Vertesi, R., Videbæk, F., Viyogi, Y. P., Vokal, S., Vossen, A., Wada, M., Wang, F., Wang, G., Wang, H., Wang, J. S., Wang, X. L., Wang, Y., Webb, G., Webb, J. C., Westfall, G. D., Wieman, H., Wissink, S. W., Witt, R., Wu, Y. F., Xiao, Z., Xie, W., Xin, K., Xu, H., Xu, J., Xu, N., Xu, Q. H., Xu, Y., Xu, Z., Yan, W., Yang, C., Yang, Y., Ye, Z., Yepes, P., Yi, L., Yip, K., Yoo, I. -K., Yu, N., Zbroszczyk, H., Zha, W., Zhang, J. B., Zhang, J. L., Zhang, S., Zhang, X. P., Zhang, Y., Zhang, Z. P., Zhao, F., Zhao, J., Zhong, C., Zhu, X., Zhu, Y. H., Zoulkarneeva, Y., and Zyzak, M.
Subjects: Physics and Astronomy (all), RHIC, STAR
Abstract: We present ΛΛ correlation measurements in heavy-ion collisions for Au+Au collisions at sqrt[s_{NN}]=200 GeV using the STAR experiment at the Relativistic Heavy-Ion Collider. The Lednický-Lyuboshitz analytical model has been used to fit the data to obtain a source size, a scattering length and an effective range. Implications of the measurement of the ΛΛ correlation function and interaction parameters for dihyperon searches are discussed.
Published: 2015

17. Markov modelling and stochastic identification for nonlinear ship rolling in random waves

Author: Marcello Vasta and J. B. Roberts
Subjects: Stationary distribution, Markov chain, General Mathematics, General Engineering, General Physics and Astronomy, Response amplitude operator, Markov model, Moment (mathematics), Nonlinear system, Control theory, Applied mathematics, Envelope (mathematics), Energy (signal processing), Mathematics
Abstract: A physically based averaging procedure is applied to a stochastic nonlinear single-degree-of-freedom equation for ship rolling, leading to a one-dimensional continuous Markov model for the energy envelope of the roll motion. It is shown that this model enables various statistics of the roll response to be estimated, including its stationary distribution and the mean time for the energy to reach a critical level. Moreover, it is demonstrated that the Markov model can be used as the basis of a new stochastic identification technique for estimating the spectrum of the excitation, and the nonlinear damping moment, from measurements of the roll response alone.
Published: 2000

18. Freeze-out dynamics via charged kaon femtoscopy insNN=200GeV central Au + Au collisions

Author: L. Adamczyk, J. K. Adkins, G. Agakishiev, M. M. Aggarwal, Z. Ahammed, I. Alekseev, J. Alford, C. D. Anson, A. Aparin, D. Arkhipkin, E. Aschenauer, G. S. Averichev, J. Balewski, A. Banerjee, Z. Barnovska, D. R. Beavis, R. Bellwied, M. J. Betancourt, R. R. Betts, A. Bhasin, A. K. Bhati, null Bhattarai, H. Bichsel, J. Bielcik, J. Bielcikova, L. C. Bland, I. G. Bordyuzhin, W. Borowski, J. Bouchet, A. V. Brandin, S. G. Brovko, E. Bruna, S. Bültmann, I. Bunzarov, T. P. Burton, J. Butterworth, H. Caines, M. Calderón de la Barca Sánchez, D. Cebra, R. Cendejas, M. C. Cervantes, P. Chaloupka, Z. Chang, S. Chattopadhyay, H. F. Chen, J. H. Chen, J. Y. Chen, L. Chen, J. Cheng, M. Cherney, A. Chikanian, W. Christie, P. Chung, J. Chwastowski, M. J. M. Codrington, R. Corliss, J. G. Cramer, H. J. Crawford, X. Cui, S. Das, A. Davila Leyva, L. C. De Silva, R. R. Debbe, T. G. Dedovich, J. Deng, R. Derradi de Souza, S. Dhamija, B. di Ruzza, L. Didenko, null Dilks, F. Ding, A. Dion, P. Djawotho, X. Dong, J. L. Drachenberg, J. E. Draper, C. M. Du, L. E. Dunkelberger, J. C. Dunlop, L. G. Efimov, M. Elnimr, J. Engelage, K. S. Engle, G. Eppley, L. Eun, O. Evdokimov, R. Fatemi, S. Fazio, J. Fedorisin, R. G. Fersch, P. Filip, E. Finch, Y. Fisyak, C. E. Flores, C. A. Gagliardi, D. R. Gangadharan, D. Garand, F. Geurts, A. Gibson, S. Gliske, O. G. Grebenyuk, D. Grosnick, Y. Guo, A. Gupta, S. Gupta, W. Guryn, B. Haag, O. Hajkova, A. Hamed, L-X. Han, R. Haque, J. W. Harris, J. P. Hays-Wehle, S. Heppelmann, A. Hirsch, G. W. Hoffmann, D. J. Hofman, S. Horvat, B. Huang, H. Z. Huang, P. Huck, T. J. Humanic, G. Igo, W. W. Jacobs, C. Jena, E. G. Judd, S. Kabana, K. Kang, K. Kauder, H. W. Ke, D. Keane, A. Kechechyan, A. Kesich, D. P. Kikola, J. Kiryluk, I. Kisel, A. Kisiel, D. D. Koetke, T. Kollegger, J. Konzer, I. Koralt, W. Korsch, L. Kotchenda, P. Kravtsov, K. Krueger, I. Kulakov, L. Kumar, R. A. Kycia, M. A. C. Lamont, J. M. Landgraf, K. D. Landry, S. LaPointe, J. Lauret, A. Lebedev, R. Lednicky, J. H. Lee, W. Leight, M. J. LeVine, C. Li, W. Li, X. Li, Y. Li, Z. M. Li, L. M. Lima, M. A. Lisa, F. Liu, T. Ljubicic, W. J. Llope, R. S. Longacre, X. Luo, G. L. Ma, Y. G. Ma, D. M. M. D. Madagodagettige Don, D. P. Mahapatra, R. Majka, S. Margetis, C. Markert, H. Masui, H. S. Matis, D. McDonald, T. S. McShane, S. Mioduszewski, M. K. Mitrovski, Y. Mohammed, B. Mohanty, M. M. Mondal, M. G. Munhoz, M. K. Mustafa, M. Naglis, B. K. Nandi, Md. Nasim, T. K. Nayak, J. M. Nelson, L. V. Nogach, J. Novak, G. Odyniec, A. Ogawa, K. Oh, A. Ohlson, V. Okorokov, E. W. Oldag, R. A. N. Oliveira, D. Olson, M. Pachr, B. S. Page, S. K. Pal, Y. X. Pan, Y. Pandit, Y. Panebratsev, T. Pawlak, B. Pawlik, H. Pei, C. Perkins, W. Peryt, P. Pile, M. Planinic, J. Pluta, D. Plyku, N. Poljak, J. Porter, A. M. Poskanzer, C. B. Powell, C. Pruneau, N. K. Pruthi, M. Przybycien, P. R. Pujahari, J. Putschke, H. Qiu, S. Ramachandran, R. Raniwala, S. Raniwala, R. L. Ray, C. K. Riley, H. G. Ritter, J. B. Roberts, O. V. Rogachevskiy, J. L. Romero, J. F. Ross, A. Roy, L. Ruan, J. Rusnak, N. R. Sahoo, P. K. Sahu, I. Sakrejda, S. Salur, A. Sandacz, J. Sandweiss, E. Sangaline, A. Sarkar, J. Schambach, R. P. Scharenberg, A. M. Schmah, B. Schmidke, N. Schmitz, T. R. Schuster, J. Seger, P. Seyboth, N. Shah, E. Shahaliev, M. Shao, B. Sharma, M. Sharma, W. Q. Shen, S. S. Shi, Q. Y. Shou, E. P. Sichtermann, R. N. Singaraju, M. J. Skoby, D. Smirnov, N. Smirnov, D. Solanki, P. Sorensen, U. G. deSouza, H. M. Spinka, B. Srivastava, T. D. S. Stanislaus, J. R. Stevens, R. Stock, M. Strikhanov, B. Stringfellow, A. A. P. Suaide, M. C. Suarez, M. Sumbera, X. M. Sun, Y. Sun, Z. Sun, B. Surrow, D. N. Svirida, T. J. M. Symons, A. Szanto de Toledo, J. Takahashi, A. H. Tang, Z. Tang, L. H. Tarini, T. Tarnowsky, J. H. Thomas, A. R. Timmins, D. Tlusty, M. Tokarev, S. Trentalange, R. E. Tribble, P. Tribedy, B. A. Trzeciak, O. D. Tsai, J. Turnau, T. Ullrich, D. G. Underwood, G. Van Buren, G. van Nieuwenhuizen, J. A. Vanfossen, R. Varma, G. M. S. Vasconcelos, R. Vertesi, F. Videbæk, Y. P. Viyogi, S. Vokal, S. A. Voloshin, A. Vossen, M. Wada, M. Walker, F. Wang, G. Wang, H. Wang, J. S. Wang, Q. Wang, X. L. Wang, Y. Wang, G. Webb, J. C. Webb, G. D. Westfall, H. Wieman, S. W. Wissink, R. Witt, Y. F. Wu, Z. Xiao, W. Xie, K. Xin, H. Xu, N. Xu, Q. H. Xu, W. Xu, Y. Xu, Z. Xu, null Yan, C. Yang, Y. Yang, P. Yepes, L. Yi, K. Yip, I-K. Yoo, Y. Zawisza, H. Zbroszczyk, W. Zha, J. B. Zhang, S. Zhang, X. P. Zhang, Y. Zhang, Z. P. Zhang, F. Zhao, J. Zhao, C. Zhong, X. Zhu, Y. H. Zhu, Y. Zoulkarneeva, and M. Zyzak
Subjects: Physics, Source function, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Nuclear Theory, Resonance, Bose–Einstein correlations, 01 natural sciences, Nuclear physics, Pion, Correlation function, 0103 physical sciences, Quark–gluon plasma, Transverse mass, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Scaling
Abstract: We present measurements of three-dimensional correlation functions of like-sign, low-transverse-momentum kaon pairs from root sNN = 200 GeV Au + Au collisions. A Cartesian surface-spherical harmonic decomposition technique was used to extract the kaon source function. The latter was found to have a three-dimensional Gaussian shape and can be adequately reproduced by Therminator event-generator simulations with resonance contributions taken into account. Compared to the pion one, the kaon source function is generally narrower and does not have the long tail along the pair transverse momentum direction. The kaon Gaussian radii display a monotonic decrease with increasing transverse mass m(T) over the interval of 0.55
Published: 2013

19. Third harmonic flow of charged particles in Au+Au collisions atsNN=200 GeV

Author: L. Adamczyk, J. K. Adkins, G. Agakishiev, M. M. Aggarwal, Z. Ahammed, A. V. Alakhverdyants, I. Alekseev, J. Alford, C. D. Anson, D. Arkhipkin, E. Aschenauer, G. S. Averichev, J. Balewski, A. Banerjee, Z. Barnovska, D. R. Beavis, R. Bellwied, M. J. Betancourt, R. R. Betts, A. Bhasin, A. K. Bhati, H. Bichsel, J. Bielcik, J. Bielcikova, L. C. Bland, I. G. Bordyuzhin, W. Borowski, J. Bouchet, A. V. Brandin, S. G. Brovko, E. Bruna, S. Bültmann, I. Bunzarov, T. P. Burton, J. Butterworth, X. Z. Cai, H. Caines, M. Calderón de la Barca Sánchez, D. Cebra, R. Cendejas, M. C. Cervantes, P. Chaloupka, Z. Chang, S. Chattopadhyay, H. F. Chen, J. H. Chen, J. Y. Chen, L. Chen, J. Cheng, M. Cherney, A. Chikanian, W. Christie, P. Chung, J. Chwastowski, M. J. M. Codrington, R. Corliss, J. G. Cramer, H. J. Crawford, X. Cui, S. Das, A. Davila Leyva, L. C. De Silva, R. R. Debbe, T. G. Dedovich, J. Deng, R. Derradi de Souza, S. Dhamija, L. Didenko, F. Ding, A. Dion, P. Djawotho, X. Dong, J. L. Drachenberg, J. E. Draper, C. M. Du, L. E. Dunkelberger, J. C. Dunlop, L. G. Efimov, M. Elnimr, J. Engelage, G. Eppley, L. Eun, O. Evdokimov, R. Fatemi, S. Fazio, J. Fedorisin, R. G. Fersch, P. Filip, E. Finch, Y. Fisyak, E. Flores, C. A. Gagliardi, D. R. Gangadharan, D. Garand, F. Geurts, A. Gibson, S. Gliske, Y. N. Gorbunov, O. G. Grebenyuk, D. Grosnick, A. Gupta, S. Gupta, W. Guryn, B. Haag, O. Hajkova, A. Hamed, L-X. Han, J. W. Harris, J. P. Hays-Wehle, S. Heppelmann, A. Hirsch, G. W. Hoffmann, D. J. Hofman, S. Horvat, B. Huang, H. Z. Huang, P. Huck, T. J. Humanic, G. Igo, W. W. Jacobs, C. Jena, E. G. Judd, S. Kabana, K. Kang, J. Kapitan, K. Kauder, H. W. Ke, D. Keane, A. Kechechyan, A. Kesich, D. P. Kikola, J. Kiryluk, I. Kisel, A. Kisiel, V. Kizka, S. R. Klein, D. D. Koetke, T. Kollegger, J. Konzer, I. Koralt, L. Koroleva, W. Korsch, L. Kotchenda, P. Kravtsov, K. Krueger, I. Kulakov, L. Kumar, M. A. C. Lamont, J. M. Landgraf, K. D. Landry, S. LaPointe, J. Lauret, A. Lebedev, R. Lednicky, J. H. Lee, W. Leight, M. J. LeVine, C. Li, W. Li, X. Li, Y. Li, Z. M. Li, L. M. Lima, M. A. Lisa, F. Liu, T. Ljubicic, W. J. Llope, R. S. Longacre, Y. Lu, X. Luo, A. Luszczak, G. L. Ma, Y. G. Ma, D. M. M. D. Madagodagettige Don, D. P. Mahapatra, R. Majka, S. Margetis, C. Markert, H. Masui, H. S. Matis, D. McDonald, T. S. McShane, S. Mioduszewski, M. K. Mitrovski, Y. Mohammed, B. Mohanty, M. M. Mondal, B. Morozov, M. G. Munhoz, M. K. Mustafa, M. Naglis, B. K. Nandi, Md. Nasim, T. K. Nayak, J. M. Nelson, L. V. Nogach, J. Novak, G. Odyniec, A. Ogawa, K. Oh, A. Ohlson, V. Okorokov, E. W. Oldag, R. A. N. Oliveira, D. Olson, P. Ostrowski, M. Pachr, B. S. Page, S. K. Pal, Y. X. Pan, Y. Pandit, Y. Panebratsev, T. Pawlak, B. Pawlik, H. Pei, C. Perkins, W. Peryt, P. Pile, M. Planinic, J. Pluta, N. Poljak, J. Porter, A. M. Poskanzer, C. B. Powell, C. Pruneau, N. K. Pruthi, M. Przybycien, P. R. Pujahari, J. Putschke, H. Qiu, A. Quintero, S. Ramachandran, R. Raniwala, S. Raniwala, R. Redwine, C. K. Riley, H. G. Ritter, J. B. Roberts, O. V. Rogachevskiy, J. L. Romero, J. F. Ross, L. Ruan, J. Rusnak, N. R. Sahoo, P. K. Sahu, I. Sakrejda, S. Salur, A. Sandacz, J. Sandweiss, E. Sangaline, A. Sarkar, J. Schambach, R. P. Scharenberg, A. M. Schmah, B. Schmidke, N. Schmitz, T. R. Schuster, J. Seele, J. Seger, P. Seyboth, N. Shah, E. Shahaliev, M. Shao, B. Sharma, M. Sharma, S. S. Shi, Q. Y. Shou, E. P. Sichtermann, R. N. Singaraju, M. J. Skoby, D. Smirnov, N. Smirnov, D. Solanki, P. Sorensen, U. G. deSouza, H. M. Spinka, B. Srivastava, T. D. S. Stanislaus, S. G. Steadman, J. R. Stevens, R. Stock, M. Strikhanov, B. Stringfellow, A. A. P. Suaide, M. C. Suarez, M. Sumbera, X. M. Sun, Y. Sun, Z. Sun, B. Surrow, D. N. Svirida, T. J. M. Symons, A. Szanto de Toledo, J. Takahashi, A. H. Tang, Z. Tang, L. H. Tarini, T. Tarnowsky, J. H. Thomas, J. Tian, A. R. Timmins, D. Tlusty, M. Tokarev, S. Trentalange, R. E. Tribble, P. Tribedy, B. A. Trzeciak, O. D. Tsai, J. Turnau, T. Ullrich, D. G. Underwood, G. Van Buren, G. van Nieuwenhuizen, J. A. Vanfossen, R. Varma, G. M. S. Vasconcelos, F. Videbæk, Y. P. Viyogi, S. Vokal, S. A. Voloshin, A. Vossen, M. Wada, F. Wang, G. Wang, H. Wang, J. S. Wang, Q. Wang, X. L. Wang, Y. Wang, G. Webb, J. C. Webb, G. D. Westfall, C. Whitten, H. Wieman, S. W. Wissink, R. Witt, Y. F. Wu, Z. Xiao, W. Xie, K. Xin, H. Xu, N. Xu, Q. H. Xu, W. Xu, Y. Xu, Z. Xu, L. Xue, Y. Yang, P. Yepes, L. Yi, K. Yip, I-K. Yoo, M. Zawisza, H. Zbroszczyk, J. B. Zhang, S. Zhang, X. P. Zhang, Y. Zhang, Z. P. Zhang, F. Zhao, J. Zhao, C. Zhong, X. Zhu, Y. H. Zhu, Y. Zoulkarneeva, and M. Zyzak
Subjects: Physics, Nuclear and High Energy Physics, Time projection chamber, 010308 nuclear & particles physics, Plane (geometry), Gaussian, 01 natural sciences, Charged particle, Nuclear physics, symbols.namesake, Pseudorapidity, 0103 physical sciences, symbols, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Anisotropy, Relativistic Heavy Ion Collider, Event (particle physics)
Abstract: We report measurements of the third harmonic coefficient of the azimuthal anisotropy, upsilon(3), known as triangular flow. The analysis is for charged particles in Au + Au collisions at root s(NN) = 200 GeV, based on data from the STAR experiment at the BNL Relativistic Heavy Ion Collider. Two-particle correlations as a function of their pseudorapidity separation are fit with narrow and wide Gaussians. Measurements of triangular flow are extracted from the wide Gaussian, from two-particle cumulants with a pseudorapidity gap, and also from event plane analysis methods with a large pseudorapidity gap between the particles and the event plane. These results are reported as a function of transverse momentum and centrality. A large dependence on the pseudorapidity gap is found. Results are compared with other experiments and model calculations.
Published: 2013

20. Elliptic flow of identified hadrons in Au+Au collisions atsNN=7.7–62.4 GeV

Author: L. Adamczyk, J. K. Adkins, G. Agakishiev, M. M. Aggarwal, Z. Ahammed, I. Alekseev, J. Alford, C. D. Anson, A. Aparin, D. Arkhipkin, E. Aschenauer, G. S. Averichev, J. Balewski, A. Banerjee, Z. Barnovska, D. R. Beavis, R. Bellwied, M. J. Betancourt, R. R. Betts, A. Bhasin, A. K. Bhati, P. Bhattarai, H. Bichsel, J. Bielcik, J. Bielcikova, L. C. Bland, I. G. Bordyuzhin, W. Borowski, J. Bouchet, A. V. Brandin, S. G. Brovko, E. Bruna, S. Bültmann, I. Bunzarov, T. P. Burton, J. Butterworth, X. Z. Cai, H. Caines, M. Calderón de la Barca Sánchez, D. Cebra, R. Cendejas, M. C. Cervantes, P. Chaloupka, Z. Chang, S. Chattopadhyay, H. F. Chen, J. H. Chen, J. Y. Chen, L. Chen, J. Cheng, M. Cherney, A. Chikanian, W. Christie, P. Chung, J. Chwastowski, M. J. M. Codrington, R. Corliss, J. G. Cramer, H. J. Crawford, X. Cui, S. Das, A. Davila Leyva, L. C. De Silva, R. R. Debbe, T. G. Dedovich, J. Deng, R. Derradi de Souza, S. Dhamija, B. di Ruzza, L. Didenko, F. Ding, A. Dion, P. Djawotho, X. Dong, J. L. Drachenberg, J. E. Draper, C. M. Du, L. E. Dunkelberger, J. C. Dunlop, L. G. Efimov, M. Elnimr, J. Engelage, G. Eppley, L. Eun, O. Evdokimov, R. Fatemi, S. Fazio, J. Fedorisin, R. G. Fersch, P. Filip, E. Finch, Y. Fisyak, E. Flores, C. A. Gagliardi, D. R. Gangadharan, D. Garand, F. Geurts, A. Gibson, S. Gliske, O. G. Grebenyuk, D. Grosnick, A. Gupta, S. Gupta, W. Guryn, B. Haag, O. Hajkova, A. Hamed, L-X. Han, J. W. Harris, J. P. Hays-Wehle, S. Heppelmann, A. Hirsch, G. W. Hoffmann, D. J. Hofman, S. Horvat, B. Huang, H. Z. Huang, P. Huck, T. J. Humanic, G. Igo, W. W. Jacobs, C. Jena, E. G. Judd, S. Kabana, K. Kang, J. Kapitan, K. Kauder, H. W. Ke, D. Keane, A. Kechechyan, A. Kesich, D. P. Kikola, J. Kiryluk, I. Kisel, A. Kisiel, S. R. Klein, D. D. Koetke, T. Kollegger, J. Konzer, I. Koralt, W. Korsch, L. Kotchenda, P. Kravtsov, K. Krueger, I. Kulakov, L. Kumar, M. A. C. Lamont, J. M. Landgraf, K. D. Landry, S. LaPointe, J. Lauret, A. Lebedev, R. Lednicky, J. H. Lee, W. Leight, M. J. LeVine, C. Li, W. Li, X. Li, Y. Li, Z. M. Li, L. M. Lima, M. A. Lisa, F. Liu, T. Ljubicic, W. J. Llope, R. S. Longacre, Y. Lu, X. Luo, A. Luszczak, G. L. Ma, Y. G. Ma, D. M. M. D. Madagodagettige Don, D. P. Mahapatra, R. Majka, S. Margetis, C. Markert, H. Masui, H. S. Matis, D. McDonald, T. S. McShane, S. Mioduszewski, M. K. Mitrovski, Y. Mohammed, B. Mohanty, M. M. Mondal, M. G. Munhoz, M. K. Mustafa, M. Naglis, B. K. Nandi, Md. Nasim, T. K. Nayak, J. M. Nelson, L. V. Nogach, J. Novak, G. Odyniec, A. Ogawa, K. Oh, A. Ohlson, V. Okorokov, E. W. Oldag, R. A. N. Oliveira, D. Olson, M. Pachr, B. S. Page, S. K. Pal, Y. X. Pan, Y. Pandit, Y. Panebratsev, T. Pawlak, B. Pawlik, H. Pei, C. Perkins, W. Peryt, P. Pile, M. Planinic, J. Pluta, N. Poljak, J. Porter, A. M. Poskanzer, C. B. Powell, C. Pruneau, N. K. Pruthi, M. Przybycien, P. R. Pujahari, J. Putschke, H. Qiu, S. Ramachandran, R. Raniwala, S. Raniwala, R. L. Ray, C. K. Riley, H. G. Ritter, J. B. Roberts, O. V. Rogachevskiy, J. L. Romero, J. F. Ross, L. Ruan, J. Rusnak, N. R. Sahoo, P. K. Sahu, I. Sakrejda, S. Salur, A. Sandacz, J. Sandweiss, E. Sangaline, A. Sarkar, J. Schambach, R. P. Scharenberg, A. M. Schmah, B. Schmidke, N. Schmitz, T. R. Schuster, J. Seger, P. Seyboth, N. Shah, E. Shahaliev, M. Shao, B. Sharma, M. Sharma, S. S. Shi, Q. Y. Shou, E. P. Sichtermann, R. N. Singaraju, M. J. Skoby, D. Smirnov, N. Smirnov, D. Solanki, P. Sorensen, U. G. deSouza, H. M. Spinka, B. Srivastava, T. D. S. Stanislaus, J. R. Stevens, R. Stock, M. Strikhanov, B. Stringfellow, A. A. P. Suaide, M. C. Suarez, M. Sumbera, X. M. Sun, Y. Sun, Z. Sun, B. Surrow, D. N. Svirida, T. J. M. Symons, A. Szanto de Toledo, J. Takahashi, A. H. Tang, Z. Tang, L. H. Tarini, T. Tarnowsky, J. H. Thomas, J. Tian, A. R. Timmins, D. Tlusty, M. Tokarev, S. Trentalange, R. E. Tribble, P. Tribedy, B. A. Trzeciak, O. D. Tsai, J. Turnau, T. Ullrich, D. G. Underwood, G. Van Buren, G. van Nieuwenhuizen, J. A. Vanfossen, R. Varma, G. M. S. Vasconcelos, F. Videbæk, Y. P. Viyogi, S. Vokal, S. A. Voloshin, A. Vossen, M. Wada, F. Wang, G. Wang, H. Wang, J. S. Wang, Q. Wang, X. L. Wang, Y. Wang, G. Webb, J. C. Webb, G. D. Westfall, C. Whitten, H. Wieman, S. W. Wissink, R. Witt, Y. F. Wu, Z. Xiao, W. Xie, K. Xin, H. Xu, N. Xu, Q. H. Xu, W. Xu, Y. Xu, Z. Xu, L. Xue, Y. Yang, P. Yepes, L. Yi, K. Yip, I-K. Yoo, M. Zawisza, H. Zbroszczyk, J. B. Zhang, S. Zhang, X. P. Zhang, Y. Zhang, Z. P. Zhang, F. Zhao, J. Zhao, C. Zhong, X. Zhu, Y. H. Zhu, Y. Zoulkarneeva, and M. Zyzak
Subjects: Quark, Physics, Nuclear and High Energy Physics, Particle physics, Meson, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Hadron, Elliptic flow, Lambda, 01 natural sciences, Omega, Nuclear physics, Baryon, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Relativistic Heavy Ion Collider
Abstract: Measurements of the elliptic flow, upsilon(2), of identified hadrons (pi(+/-), K-+/-, K-s(0), p, (p) over bar, phi, Lambda, (Lambda) over bar, Xi(-), (Xi) over bar (+), Omega(-), (Omega) over bar (+)) in Au + Au collisions at root s(NN) = 7.7, 11.5, 19.6, 27, 39, and 62.4 GeV are presented. The measurements were done at midrapidity using the time-projection chamber and the time-of-flight detectors of the Solenoidal Tracker at RHIC experiment during the beam-energy scan program at Relativistic Heavy Ion Collider. A significant difference in the upsilon(2) values for particles and the corresponding antiparticles was observed at all transverse momenta for the first time. The difference increases with decreasing center-of-mass energy, root s(NN) (or increasing baryon chemical potential, mu(B)), and is larger for the baryons as compared to the mesons. This implies that particles and antiparticles are no longer consistent with the universal number-of-constituent quark (NCQ) scaling of upsilon(2) that was observed at root s(NN) = 200 GeV. However, for the selected group of particles (p(+), K+, K-s(0), p, Lambda, Xi(-), Omega(-)) NCQ scaling at (m(T) - m(0))/n(q) > 0.4 GeV/c(2) is not violated within +/- 10%. The upsilon(2) values for f mesons at 7.7 and 11.5 GeV are approximately two standard deviations from the trend defined by the other hadrons at the highest measured p(T) values.
Published: 2013

21. The Hurricane Imaging Radiometer: Present and future

Author: Sayak Biswas, Spencer Farrar, Saleem Sahawneh, Timothy L. Miller, J. B. Roberts, Peter G. Black, Eric W. Uhlhorn, Daniel J. Cecil, James A. Johnson, Mary Morris, W.L. Jones, Christopher S. Ruf, and Mark James
Subjects: Radiometer, Meteorology, Microwave radiometer, Radiometry, Environmental science, Storm, Tropical cyclone, Antenna (radio), Wind direction, Wind speed, Remote sensing
Abstract: The Hurricane Imaging Radiometer (HIRAD) is an airborne passive microwave radiometer designed to provide high resolution, wide swath imagery of surface wind speed in tropical cyclones from a low profile planar antenna with no mechanical scanning. Wind speed and rain rate images from HIRAD's first field campaign (GRIP, 2010) are presented here followed, by a discussion on the performance of the newly installed thermal control system during the 2012 HS3 campaign. The paper ends with a discussion on the next generation dual polarization HIRAD antenna (already designed) for a future system capable of measuring wind direction as well as wind speed.
Published: 2013

22. System-size dependence of transverse momentum correlations atsNN=62.4and 200 GeV at the BNL Relativistic Heavy Ion Collider

Author: L. Adamczyk, J. K. Adkins, G. Agakishiev, M. M. Aggarwal, Z. Ahammed, I. Alekseev, J. Alford, C. D. Anson, A. Aparin, D. Arkhipkin, E. Aschenauer, G. S. Averichev, J. Balewski, A. Banerjee, Z. Barnovska, D. R. Beavis, R. Bellwied, M. J. Betancourt, R. R. Betts, A. Bhasin, A. K. Bhati, null Bhattarai, H. Bichsel, J. Bielcik, J. Bielcikova, L. C. Bland, I. G. Bordyuzhin, W. Borowski, J. Bouchet, A. V. Brandin, S. G. Brovko, E. Bruna, S. Bültmann, I. Bunzarov, T. P. Burton, J. Butterworth, X. Z. Cai, H. Caines, M. Calderón de la Barca Sánchez, D. Cebra, R. Cendejas, M. C. Cervantes, P. Chaloupka, Z. Chang, S. Chattopadhyay, H. F. Chen, J. H. Chen, J. Y. Chen, L. Chen, J. Cheng, M. Cherney, A. Chikanian, W. Christie, P. Chung, J. Chwastowski, M. J. M. Codrington, R. Corliss, J. G. Cramer, H. J. Crawford, X. Cui, S. Das, A. Davila Leyva, L. C. De Silva, R. R. Debbe, T. G. Dedovich, J. Deng, R. Derradi de Souza, S. Dhamija, B. di Ruzza, L. Didenko, F. Ding, A. Dion, P. Djawotho, X. Dong, J. L. Drachenberg, J. E. Draper, C. M. Du, L. E. Dunkelberger, J. C. Dunlop, L. G. Efimov, M. Elnimr, J. Engelage, G. Eppley, L. Eun, O. Evdokimov, R. Fatemi, S. Fazio, J. Fedorisin, R. G. Fersch, P. Filip, E. Finch, Y. Fisyak, E. Flores, C. A. Gagliardi, D. R. Gangadharan, D. Garand, F. Geurts, A. Gibson, S. Gliske, O. G. Grebenyuk, D. Grosnick, A. Gupta, S. Gupta, W. Guryn, B. Haag, O. Hajkova, A. Hamed, L-X. Han, J. W. Harris, J. P. Hays-Wehle, S. Heppelmann, A. Hirsch, G. W. Hoffmann, D. J. Hofman, S. Horvat, B. Huang, H. Z. Huang, P. Huck, T. J. Humanic, G. Igo, W. W. Jacobs, C. Jena, E. G. Judd, S. Kabana, K. Kang, J. Kapitan, K. Kauder, H. W. Ke, D. Keane, A. Kechechyan, A. Kesich, D. P. Kikola, J. Kiryluk, I. Kisel, A. Kisiel, S. R. Klein, D. D. Koetke, T. Kollegger, J. Konzer, I. Koralt, W. Korsch, L. Kotchenda, P. Kravtsov, K. Krueger, I. Kulakov, L. Kumar, M. A. C. Lamont, J. M. Landgraf, K. D. Landry, S. LaPointe, J. Lauret, A. Lebedev, R. Lednicky, J. H. Lee, W. Leight, M. J. LeVine, C. Li, W. Li, X. Li, Y. Li, Z. M. Li, L. M. Lima, M. A. Lisa, F. Liu, T. Ljubicic, W. J. Llope, R. S. Longacre, Y. Lu, X. Luo, A. Luszczak, G. L. Ma, Y. G. Ma, D. M. M. D. Madagodagettige Don, D. P. Mahapatra, R. Majka, S. Margetis, C. Markert, H. Masui, H. S. Matis, D. McDonald, T. S. McShane, S. Mioduszewski, M. K. Mitrovski, Y. Mohammed, B. Mohanty, M. M. Mondal, M. G. Munhoz, M. K. Mustafa, M. Naglis, B. K. Nandi, Md. Nasim, T. K. Nayak, J. M. Nelson, L. V. Nogach, J. Novak, G. Odyniec, A. Ogawa, K. Oh, A. Ohlson, V. Okorokov, E. W. Oldag, R. A. N. Oliveira, D. Olson, M. Pachr, B. S. Page, S. K. Pal, Y. X. Pan, Y. Pandit, Y. Panebratsev, T. Pawlak, B. Pawlik, H. Pei, C. Perkins, W. Peryt, P. Pile, M. Planinic, J. Pluta, N. Poljak, J. Porter, A. M. Poskanzer, C. B. Powell, C. Pruneau, N. K. Pruthi, M. Przybycien, P. R. Pujahari, J. Putschke, H. Qiu, S. Ramachandran, R. Raniwala, S. Raniwala, R. L. Ray, R. Redwine, C. K. Riley, H. G. Ritter, J. B. Roberts, O. V. Rogachevskiy, J. L. Romero, J. F. Ross, L. Ruan, J. Rusnak, N. R. Sahoo, P. K. Sahu, I. Sakrejda, S. Salur, A. Sandacz, J. Sandweiss, E. Sangaline, A. Sarkar, J. Schambach, R. P. Scharenberg, A. M. Schmah, B. Schmidke, N. Schmitz, T. R. Schuster, J. Seele, J. Seger, P. Seyboth, N. Shah, E. Shahaliev, M. Shao, B. Sharma, M. Sharma, S. S. Shi, Q. Y. Shou, E. P. Sichtermann, R. N. Singaraju, M. J. Skoby, D. Smirnov, N. Smirnov, D. Solanki, P. Sorensen, U. G. deSouza, H. M. Spinka, B. Srivastava, T. D. S. Stanislaus, S. G. Steadman, J. R. Stevens, R. Stock, M. Strikhanov, B. Stringfellow, A. A. P. Suaide, M. C. Suarez, M. Sumbera, X. M. Sun, Y. Sun, Z. Sun, B. Surrow, D. N. Svirida, T. J. M. Symons, A. Szanto de Toledo, J. Takahashi, A. H. Tang, Z. Tang, L. H. Tarini, T. Tarnowsky, J. H. Thomas, J. Tian, A. R. Timmins, D. Tlusty, M. Tokarev, S. Trentalange, R. E. Tribble, P. Tribedy, B. A. Trzeciak, O. D. Tsai, J. Turnau, T. Ullrich, D. G. Underwood, G. Van Buren, G. van Nieuwenhuizen, J. A. Vanfossen, R. Varma, G. M. S. Vasconcelos, F. Videbæk, Y. P. Viyogi, S. Vokal, S. A. Voloshin, A. Vossen, M. Wada, F. Wang, G. Wang, H. Wang, J. S. Wang, Q. Wang, X. L. Wang, Y. Wang, G. Webb, J. C. Webb, G. D. Westfall, C. Whitten, H. Wieman, S. W. Wissink, R. Witt, Y. F. Wu, Z. Xiao, W. Xie, K. Xin, H. Xu, N. Xu, Q. H. Xu, W. Xu, Y. Xu, Z. Xu, L. Xue, Y. Yang, P. Yepes, L. Yi, K. Yip, I-K. Yoo, M. Zawisza, H. Zbroszczyk, J. B. Zhang, S. Zhang, X. P. Zhang, Y. Zhang, Z. P. Zhang, F. Zhao, J. Zhao, C. Zhong, X. Zhu, Y. H. Zhu, Y. Zoulkarneeva, and M. Zyzak
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Star (game theory), Monte Carlo method, Jet (particle physics), 7. Clean energy, 01 natural sciences, Charged particle, Nuclear physics, Pseudorapidity, 0103 physical sciences, Nuclear Experiment, 010306 general physics, Relativistic Heavy Ion Collider, Size dependence, Energy (signal processing)
Abstract: We present a study of the average transverse momentum (${p}_{t}$) fluctuations and ${p}_{t}$ correlations for charged particles produced in Cu+Cu collisions at midrapidity for $\sqrt{{s}_{NN}}=$ 62.4 and 200 GeV. These results are compared with those published for Au+Au collisions at the same energies, to explore the system size dependence. In addition to the collision energy and system size dependence, the ${p}_{t}$ correlation results have been studied as functions of the collision centralities, the ranges in ${p}_{t}$, the pseudorapidity $\ensuremath{\eta}$, and the azimuthal angle $\ensuremath{\phi}$. The square root of the measured ${p}_{t}$ correlations when scaled by mean ${p}_{t}$ is found to be independent of both colliding beam energy and system size studied. Transport-based model calculations are found to have a better quantitative agreement with the measurements compared to models which incorporate only jetlike correlations.
Published: 2013

23. Experimental studies of di-jets in Au plus Au collisions using angular correlations with respect to back-to-back leading hadrons

Author: L. Adamczyk, G. Agakishiev, M. M. Aggarwal, Z. Ahammed, A. V. Alakhverdyants, I. Alekseev, J. Alford, C. D. Anson, D. Arkhipkin, E. Aschenauer, G. S. Averichev, J. Balewski, A. Banerjee, Z. Barnovska, D. R. Beavis, R. Bellwied, M. J. Betancourt, R. R. Betts, A. Bhasin, A. K. Bhati, H. Bichsel, J. Bielcik, J. Bielcikova, L. C. Bland, I. G. Bordyuzhin, W. Borowski, J. Bouchet, A. V. Brandin, S. G. Brovko, E. Bruna, S. Bültmann, I. Bunzarov, T. P. Burton, J. Butterworth, X. Z. Cai, H. Caines, M. Calderón de la Barca Sánchez, D. Cebra, R. Cendejas, M. C. Cervantes, P. Chaloupka, Z. Chang, S. Chattopadhyay, H. F. Chen, J. H. Chen, J. Y. Chen, L. Chen, J. Cheng, M. Cherney, A. Chikanian, W. Christie, P. Chung, J. Chwastowski, M. J. M. Codrington, R. Corliss, J. G. Cramer, H. J. Crawford, X. Cui, S. Das, A. Davila Leyva, L. C. De Silva, R. R. Debbe, T. G. Dedovich, J. Deng, R. Derradi de Souza, S. Dhamija, L. Didenko, F. Ding, A. Dion, P. Djawotho, X. Dong, J. L. Drachenberg, J. E. Draper, C. M. Du, L. E. Dunkelberger, J. C. Dunlop, L. G. Efimov, M. Elnimr, J. Engelage, G. Eppley, L. Eun, O. Evdokimov, R. Fatemi, S. Fazio, J. Fedorisin, R. G. Fersch, P. Filip, E. Finch, Y. Fisyak, C. A. Gagliardi, D. R. Gangadharan, F. Geurts, A. Gibson, S. Gliske, Y. N. Gorbunov, O. G. Grebenyuk, D. Grosnick, S. Gupta, W. Guryn, B. Haag, O. Hajkova, A. Hamed, L-X. Han, J. W. Harris, J. P. Hays-Wehle, S. Heppelmann, A. Hirsch, G. W. Hoffmann, D. J. Hofman, S. Horvat, B. Huang, H. Z. Huang, P. Huck, T. J. Humanic, L. Huo, G. Igo, W. W. Jacobs, C. Jena, E. G. Judd, S. Kabana, K. Kang, J. Kapitan, K. Kauder, H. W. Ke, D. Keane, A. Kechechyan, A. Kesich, D. P. Kikola, J. Kiryluk, I. Kisel, A. Kisiel, V. Kizka, S. R. Klein, D. D. Koetke, T. Kollegger, J. Konzer, I. Koralt, L. Koroleva, W. Korsch, L. Kotchenda, P. Kravtsov, K. Krueger, I. Kulakov, L. Kumar, M. A. C. Lamont, J. M. Landgraf, S. LaPointe, J. Lauret, A. Lebedev, R. Lednicky, J. H. Lee, W. Leight, M. J. LeVine, C. Li, L. Li, W. Li, X. Li, Y. Li, Z. M. Li, L. M. Lima, M. A. Lisa, F. Liu, T. Ljubicic, W. J. Llope, R. S. Longacre, Y. Lu, X. Luo, A. Luszczak, G. L. Ma, Y. G. Ma, D. M. M. D. Madagodagettige Don, D. P. Mahapatra, R. Majka, O. I. Mall, S. Margetis, C. Markert, H. Masui, H. S. Matis, D. McDonald, T. S. McShane, S. Mioduszewski, M. K. Mitrovski, Y. Mohammed, B. Mohanty, M. M. Mondal, B. Morozov, M. G. Munhoz, M. K. Mustafa, M. Naglis, B. K. Nandi, Md. Nasim, T. K. Nayak, J. M. Nelson, L. V. Nogach, J. Novak, G. Odyniec, A. Ogawa, K. Oh, A. Ohlson, V. Okorokov, E. W. Oldag, R. A. N. Oliveira, D. Olson, P. Ostrowski, M. Pachr, B. S. Page, S. K. Pal, Y. X. Pan, Y. Pandit, Y. Panebratsev, T. Pawlak, B. Pawlik, H. Pei, C. Perkins, W. Peryt, P. Pile, M. Planinic, J. Pluta, D. Plyku, N. Poljak, J. Porter, A. M. Poskanzer, C. B. Powell, C. Pruneau, N. K. Pruthi, M. Przybycien, P. R. Pujahari, J. Putschke, H. Qiu, R. Raniwala, S. Raniwala, R. L. Ray, R. Redwine, R. Reed, C. K. Riley, H. G. Ritter, J. B. Roberts, O. V. Rogachevskiy, J. L. Romero, J. F. Ross, L. Ruan, J. Rusnak, N. R. Sahoo, P. K. Sahu, I. Sakrejda, S. Salur, A. Sandacz, J. Sandweiss, E. Sangaline, A. Sarkar, J. Schambach, R. P. Scharenberg, A. M. Schmah, B. Schmidke, N. Schmitz, T. R. Schuster, J. Seele, J. Seger, P. Seyboth, N. Shah, E. Shahaliev, M. Shao, B. Sharma, M. Sharma, S. S. Shi, Q. Y. Shou, E. P. Sichtermann, R. N. Singaraju, M. J. Skoby, D. Smirnov, N. Smirnov, D. Solanki, P. Sorensen, U. G. deSouza, H. M. Spinka, B. Srivastava, T. D. S. Stanislaus, S. G. Steadman, J. R. Stevens, R. Stock, M. Strikhanov, B. Stringfellow, A. A. P. Suaide, M. C. Suarez, M. Sumbera, X. M. Sun, Y. Sun, Z. Sun, B. Surrow, D. N. Svirida, T. J. M. Symons, A. Szanto de Toledo, J. Takahashi, A. H. Tang, Z. Tang, L. H. Tarini, T. Tarnowsky, D. Thein, J. H. Thomas, J. Tian, A. R. Timmins, D. Tlusty, M. Tokarev, S. Trentalange, R. E. Tribble, P. Tribedy, B. A. Trzeciak, O. D. Tsai, J. Turnau, T. Ullrich, D. G. Underwood, G. Van Buren, G. van Nieuwenhuizen, J. A. Vanfossen, R. Varma, G. M. S. Vasconcelos, F. Videbæk, Y. P. Viyogi, S. Vokal, S. A. Voloshin, A. Vossen, M. Wada, F. Wang, G. Wang, H. Wang, J. S. Wang, Q. Wang, X. L. Wang, Y. Wang, G. Webb, J. C. Webb, G. D. Westfall, C. Whitten, H. Wieman, S. W. Wissink, R. Witt, W. Witzke, Y. F. Wu, Z. Xiao, W. Xie, K. Xin, H. Xu, N. Xu, Q. H. Xu, W. Xu, Y. Xu, Z. Xu, L. Xue, Y. Yang, P. Yepes, Y. Yi, K. Yip, I-K. Yoo, M. Zawisza, H. Zbroszczyk, J. B. Zhang, S. Zhang, X. P. Zhang, Y. Zhang, Z. P. Zhang, F. Zhao, J. Zhao, C. Zhong, X. Zhu, Y. H. Zhu, Y. Zoulkarneeva, and M. Zyzak
Subjects: Physics, AuAu, Nuclear and High Energy Physics, Particle physics, STAR, 010308 nuclear & particles physics, media_common.quotation_subject, Hadron, Di-jets, 01 natural sciences, Asymmetry, NATURAL SCIENCES. Physics, Nuclear physics, PRIRODNE ZNANOSTI. Fizika, hadrons, Deuterium, Angular correlation, 0103 physical sciences, Transverse momentum, High Energy Physics::Experiment, 010306 general physics, Relativistic Heavy Ion Collider, Nuclear Experiment, media_common
Abstract: Jet-medium interactions are studied via a multihadron correlation technique ( called "2 + 1"), where a pair of back-to-back hadron triggers with large transverse momentum is used as a proxy for a di-jet. This work extends the previous analysis for nearly symmetric trigger pairs with the highest momentum threshold of trigger hadron of 5 GeV/c with the new calorimeter-based triggers with energy thresholds of up to 10 GeV and above. The distributions of associated hadrons are studied in terms of correlation shapes and per-trigger yields on each trigger side. In contrast with di-hadron correlation results with single triggers, the associated hadron distributions for back-to-back triggers from central Au + Au data at root S-NN = 200 GeV show no strong modifications compared to d + Au data at the same energy. An imbalance in the total transverse momentum between hadrons attributed to the near-side and away-side of jetlike peaks is observed. The relative imbalance in the Au + Au measurement with respect to d + Au reference is found to increase with the asymmetry of the trigger pair, consistent with the expectation from medium-induced energy-loss effects. In addition, this relative total transverse momentum imbalance is found to decrease for softer associated hadrons. Such evolution indicates that the energy missing at higher associated momenta is converted into softer hadrons. DOI:10.1103/PhysRevC.87.044903
Published: 2013

24. Anomalous centrality evolution of two-particle angular correlations from Au-Au collisions atsNN=62and 200 GeV

Author: G. Agakishiev, M. M. Aggarwal, Z. Ahammed, A. V. Alakhverdyants, I. Alekseev, J. Alford, B. D. Anderson, C. D. Anson, D. Arkhipkin, G. S. Averichev, J. Balewski, D. R. Beavis, N. K. Behera, R. Bellwied, M. J. Betancourt, R. R. Betts, A. Bhasin, A. K. Bhati, H. Bichsel, J. Bielcik, J. Bielcikova, L. C. Bland, I. G. Bordyuzhin, W. Borowski, J. Bouchet, E. Braidot, A. V. Brandin, S. G. Brovko, E. Bruna, S. Bueltmann, I. Bunzarov, T. P. Burton, X. Z. Cai, H. Caines, M. Calderón de la Barca Sánchez, D. Cebra, R. Cendejas, M. C. Cervantes, P. Chaloupka, S. Chattopadhyay, H. F. Chen, J. H. Chen, J. Y. Chen, L. Chen, J. Cheng, M. Cherney, A. Chikanian, W. Christie, P. Chung, M. J. M. Codrington, R. Corliss, J. G. Cramer, H. J. Crawford, X. Cui, M. S. Daugherity, A. Davila Leyva, L. C. De Silva, R. R. Debbe, T. G. Dedovich, J. Deng, A. A. Derevschikov, R. Derradi de Souza, L. Didenko, P. Djawotho, X. Dong, J. L. Drachenberg, J. E. Draper, C. M. Du, J. C. Dunlop, L. G. Efimov, M. Elnimr, J. Engelage, G. Eppley, M. Estienne, L. Eun, O. Evdokimov, R. Fatemi, J. Fedorisin, R. G. Fersch, P. Filip, E. Finch, V. Fine, Y. Fisyak, C. A. Gagliardi, D. R. Gangadharan, F. Geurts, P. Ghosh, Y. N. Gorbunov, A. Gordon, O. G. Grebenyuk, D. Grosnick, A. Gupta, S. Gupta, B. Haag, O. Hajkova, A. Hamed, L.-X. Han, J. P. Hays-Wehle, S. Heppelmann, A. Hirsch, G. W. Hoffmann, D. J. Hofman, B. Huang, H. Z. Huang, T. J. Humanic, L. Huo, G. Igo, W. W. Jacobs, C. Jena, J. Joseph, E. G. Judd, S. Kabana, K. Kang, J. Kapitan, K. Kauder, H. W. Ke, D. Keane, A. Kechechyan, D. Kettler, D. P. Kikola, J. Kiryluk, A. Kisiel, V. Kizka, S. R. Klein, D. D. Koetke, T. Kollegger, J. Konzer, I. Koralt, L. Koroleva, W. Korsch, L. Kotchenda, P. Kravtsov, K. Krueger, L. Kumar, M. A. C. Lamont, J. M. Landgraf, S. LaPointe, J. Lauret, A. Lebedev, R. Lednicky, J. H. Lee, W. Leight, M. J. LeVine, C. Li, L. Li, W. Li, X. Li, Y. Li, Z. M. Li, L. M. Lima, M. A. Lisa, F. Liu, T. Ljubicic, W. J. Llope, R. S. Longacre, Y. Lu, E. V. Lukashov, X. Luo, G. L. Ma, Y. G. Ma, D. P. Mahapatra, R. Majka, O. I. Mall, R. Manweiler, S. Margetis, C. Markert, H. Masui, H. S. Matis, D. McDonald, T. S. McShane, A. Meschanin, R. Milner, N. G. Minaev, S. Mioduszewski, M. K. Mitrovski, Y. Mohammed, B. Mohanty, M. M. Mondal, B. Morozov, D. A. Morozov, M. G. Munhoz, M. K. Mustafa, M. Naglis, B. K. Nandi, T. K. Nayak, L. V. Nogach, S. B. Nurushev, G. Odyniec, A. Ogawa, K. Oh, A. Ohlson, V. Okorokov, E. W. Oldag, R. A. N. Oliveira, D. Olson, M. Pachr, B. S. Page, S. K. Pal, Y. Pandit, Y. Panebratsev, T. Pawlak, H. Pei, T. Peitzmann, C. Perkins, W. Peryt, P. Pile, M. Planinic, J. Pluta, D. Plyku, N. Poljak, J. Porter, C. B. Powell, D. Prindle, C. Pruneau, N. K. Pruthi, P. R. Pujahari, J. Putschke, H. Qiu, R. Raniwala, S. Raniwala, R. L. Ray, R. Redwine, R. Reed, H. G. Ritter, J. B. Roberts, O. V. Rogachevskiy, J. L. Romero, L. Ruan, J. Rusnak, N. R. Sahoo, I. Sakrejda, S. Salur, J. Sandweiss, E. Sangaline, A. Sarkar, J. Schambach, R. P. Scharenberg, J. Schaub, A. M. Schmah, N. Schmitz, T. R. Schuster, J. Seele, J. Seger, I. Selyuzhenkov, P. Seyboth, N. Shah, E. Shahaliev, M. Shao, M. Sharma, S. S. Shi, Q. Y. Shou, E. P. Sichtermann, F. Simon, R. N. Singaraju, M. J. Skoby, N. Smirnov, D. Solanki, P. Sorensen, U. G. deSouza, H. M. Spinka, B. Srivastava, T. D. S. Stanislaus, S. G. Steadman, J. R. Stevens, R. Stock, M. Strikhanov, B. Stringfellow, A. A. P. Suaide, M. C. Suarez, M. Sumbera, X. M. Sun, Y. Sun, Z. Sun, B. Surrow, D. N. Svirida, T. J. M. Symons, A. Szanto de Toledo, J. Takahashi, A. H. Tang, Z. Tang, L. H. Tarini, T. Tarnowsky, D. Thein, J. H. Thomas, J. Tian, A. R. Timmins, D. Tlusty, M. Tokarev, T. A. Trainor, S. Trentalange, R. E. Tribble, P. Tribedy, B. A. Trzeciak, O. D. Tsai, T. Ullrich, D. G. Underwood, G. Van Buren, G. van Nieuwenhuizen, J. A. Vanfossen, R. Varma, G. M. S. Vasconcelos, A. N. Vasiliev, F. Videbæk, Y. P. Viyogi, S. Vokal, M. Wada, M. Walker, F. Wang, G. Wang, H. Wang, J. S. Wang, Q. Wang, X. L. Wang, Y. Wang, G. Webb, J. C. Webb, G. D. Westfall, C. Whitten, H. Wieman, S. W. Wissink, R. Witt, W. Witzke, Y. F. Wu, Z. Xiao, W. Xie, H. Xu, N. Xu, Q. H. Xu, W. Xu, Y. Xu, Z. Xu, L. Xue, Y. Yang, P. Yepes, K. Yip, I.-K. Yoo, M. Zawisza, H. Zbroszczyk, W. Zhan, J. B. Zhang, S. Zhang, W. M. Zhang, X. P. Zhang, Y. Zhang, Z. P. Zhang, F. Zhao, J. Zhao, C. Zhong, X. Zhu, Y. H. Zhu, and Y. Zoulkarneeva
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Scattering, Elliptic flow, Perturbative QCD, Parton, 01 natural sciences, Charged particle, Nuclear physics, Pseudorapidity, 0103 physical sciences, Nuclear Experiment, 010306 general physics, Jet quenching, QCD matter
Abstract: We present two-dimensional (2D) two-particle angular correlations measured with the STAR detector on relative pseudorapidity η and azimuth ϕ for charged particles from Au-Au collisions at √sNN=62 and 200 GeV with transverse momentum pt≥0.15 GeV/c, |η|≤1, and 2π in azimuth. Observed correlations include a same-side (relative azimuth
Published: 2012

25. Inclusive charged hadron elliptic flow in Au+Au collisions atsNN=7.7–39 GeV

Author: L. Adamczyk, G. Agakishiev, M. M. Aggarwal, Z. Ahammed, A. V. Alakhverdyants, I. Alekseev, J. Alford, B. D. Anderson, C. D. Anson, D. Arkhipkin, E. Aschenauer, G. S. Averichev, J. Balewski, A. Banerjee, Z. Barnovska, D. R. Beavis, R. Bellwied, M. J. Betancourt, R. R. Betts, A. Bhasin, A. K. Bhati, H. Bichsel, J. Bielcik, J. Bielcikova, L. C. Bland, I. G. Bordyuzhin, W. Borowski, J. Bouchet, A. V. Brandin, S. G. Brovko, E. Bruna, S. Bültmann, I. Bunzarov, T. P. Burton, J. Butterworth, X. Z. Cai, H. Caines, M. Calderón de la Barca Sánchez, D. Cebra, R. Cendejas, M. C. Cervantes, P. Chaloupka, Z. Chang, S. Chattopadhyay, H. F. Chen, J. H. Chen, J. Y. Chen, L. Chen, J. Cheng, M. Cherney, A. Chikanian, W. Christie, P. Chung, J. Chwastowski, M. J. M. Codrington, R. Corliss, J. G. Cramer, H. J. Crawford, X. Cui, A. Davila Leyva, L. C. De Silva, R. R. Debbe, T. G. Dedovich, J. Deng, R. Derradi de Souza, S. Dhamija, L. Didenko, F. Ding, A. Dion, P. Djawotho, X. Dong, J. L. Drachenberg, J. E. Draper, C. M. Du, L. E. Dunkelberger, J. C. Dunlop, L. G. Efimov, M. Elnimr, J. Engelage, G. Eppley, L. Eun, O. Evdokimov, R. Fatemi, S. Fazio, J. Fedorisin, R. G. Fersch, P. Filip, E. Finch, Y. Fisyak, C. A. Gagliardi, D. R. Gangadharan, F. Geurts, A. Gibson, S. Gliske, Y. N. Gorbunov, O. G. Grebenyuk, D. Grosnick, S. Gupta, W. Guryn, B. Haag, O. Hajkova, A. Hamed, L-X. Han, J. W. Harris, J. P. Hays-Wehle, S. Heppelmann, A. Hirsch, G. W. Hoffmann, D. J. Hofman, S. Horvat, B. Huang, H. Z. Huang, P. Huck, T. J. Humanic, L. Huo, G. Igo, W. W. Jacobs, C. Jena, J. Joseph, E. G. Judd, S. Kabana, K. Kang, J. Kapitan, K. Kauder, H. W. Ke, D. Keane, A. Kechechyan, A. Kesich, D. Kettler, D. P. Kikola, J. Kiryluk, I. Kisel, A. Kisiel, V. Kizka, S. R. Klein, D. D. Koetke, T. Kollegger, J. Konzer, I. Koralt, L. Koroleva, W. Korsch, L. Kotchenda, P. Kravtsov, K. Krueger, I. Kulakov, L. Kumar, M. A. C. Lamont, J. M. Landgraf, S. LaPointe, J. Lauret, A. Lebedev, R. Lednicky, J. H. Lee, W. Leight, M. J. LeVine, C. Li, L. Li, W. Li, X. Li, Y. Li, Z. M. Li, L. M. Lima, M. A. Lisa, F. Liu, T. Ljubicic, W. J. Llope, R. S. Longacre, Y. Lu, X. Luo, A. Luszczak, G. L. Ma, Y. G. Ma, D. M. M. D. Madagodagettige Don, D. P. Mahapatra, R. Majka, O. I. Mall, S. Margetis, C. Markert, H. Masui, H. S. Matis, D. McDonald, T. S. McShane, S. Mioduszewski, M. K. Mitrovski, Y. Mohammed, B. Mohanty, M. M. Mondal, B. Morozov, M. G. Munhoz, M. K. Mustafa, M. Naglis, B. K. Nandi, Md. Nasim, T. K. Nayak, J. M. Nelson, L. V. Nogach, J. Novak, G. Odyniec, A. Ogawa, K. Oh, A. Ohlson, V. Okorokov, E. W. Oldag, R. A. N. Oliveira, D. Olson, P. Ostrowski, M. Pachr, B. S. Page, S. K. Pal, Y. X. Pan, Y. Pandit, Y. Panebratsev, T. Pawlak, B. Pawlik, H. Pei, C. Perkins, W. Peryt, P. Pile, M. Planinic, J. Pluta, D. Plyku, N. Poljak, J. Porter, A. M. Poskanzer, C. B. Powell, D. Prindle, C. Pruneau, N. K. Pruthi, M. Przybycien, P. R. Pujahari, J. Putschke, H. Qiu, R. Raniwala, S. Raniwala, R. L. Ray, R. Redwine, R. Reed, C. K. Riley, H. G. Ritter, J. B. Roberts, O. V. Rogachevskiy, J. L. Romero, J. F. Ross, L. Ruan, J. Rusnak, N. R. Sahoo, I. Sakrejda, S. Salur, A. Sandacz, J. Sandweiss, E. Sangaline, A. Sarkar, J. Schambach, R. P. Scharenberg, A. M. Schmah, B. Schmidke, N. Schmitz, T. R. Schuster, J. Seele, J. Seger, P. Seyboth, N. Shah, E. Shahaliev, M. Shao, B. Sharma, M. Sharma, S. S. Shi, Q. Y. Shou, E. P. Sichtermann, R. N. Singaraju, M. J. Skoby, D. Smirnov, N. Smirnov, D. Solanki, P. Sorensen, U. G. deSouza, H. M. Spinka, B. Srivastava, T. D. S. Stanislaus, S. G. Steadman, G. S. F. Stephans, J. R. Stevens, R. Stock, M. Strikhanov, B. Stringfellow, A. A. P. Suaide, M. C. Suarez, M. Sumbera, X. M. Sun, Y. Sun, Z. Sun, B. Surrow, D. N. Svirida, T. J. M. Symons, A. Szanto de Toledo, J. Takahashi, A. H. Tang, Z. Tang, L. H. Tarini, T. Tarnowsky, D. Thein, J. H. Thomas, J. Tian, A. R. Timmins, D. Tlusty, M. Tokarev, S. Trentalange, R. E. Tribble, P. Tribedy, B. A. Trzeciak, O. D. Tsai, J. Turnau, T. Ullrich, D. G. Underwood, G. Van Buren, G. van Nieuwenhuizen, J. A. Vanfossen, R. Varma, G. M. S. Vasconcelos, F. Videbæk, Y. P. Viyogi, S. Vokal, S. A. Voloshin, A. Vossen, M. Wada, F. Wang, G. Wang, H. Wang, J. S. Wang, Q. Wang, X. L. Wang, Y. Wang, G. Webb, J. C. Webb, G. D. Westfall, C. Whitten, H. Wieman, S. W. Wissink, R. Witt, W. Witzke, Y. F. Wu, Z. Xiao, W. Xie, K. Xin, H. Xu, N. Xu, Q. H. Xu, W. Xu, Y. Xu, Z. Xu, L. Xue, Y. Yang, P. Yepes, Y. Yi, K. Yip, I-K. Yoo, M. Zawisza, H. Zbroszczyk, J. B. Zhang, S. Zhang, W. M. Zhang, X. P. Zhang, Y. Zhang, Z. P. Zhang, F. Zhao, J. Zhao, C. Zhong, X. Zhu, Y. H. Zhu, Y. Zoulkarneeva, and M. Zyzak
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, 010308 nuclear & particles physics, Hadron, Elliptic flow, Collision, 01 natural sciences, Nuclear physics, Critical point (thermodynamics), Pseudorapidity, 0103 physical sciences, High Energy Physics::Experiment, Coordinate space, Nuclear Experiment, 010306 general physics, Relativistic Heavy Ion Collider
Abstract: A systematic study is presented for centrality, transverse momentum (p(T)), and pseudorapidity (eta) dependence of the inclusive charged hadron elliptic flow (v(2)) at midrapidity (vertical bar eta vertical bar < 1.0) in Au + Au collisions at root s(NN) = 7.7, 11.5, 19.6, 27, and 39 GeV. The results obtained with different methods, including correlations with the event plane reconstructed in a region separated by a large pseudorapidity gap and four-particle cumulants (v(2){4}), are presented to investigate nonflow correlations and v(2) fluctuations. We observe that the difference between v(2){2} and v(2){4} is smaller at the lower collision energies. Values of v(2), scaled by the initial coordinate space eccentricity, v(2)/epsilon, as a function of p(T) are larger in more central collisions, suggesting stronger collective flow develops in more central collisions, similar to the results at higher collision energies. These results are compared to measurements at higher energies at the Relativistic Heavy Ion Collider (root s(NN) = 62.4 and 200 GeV) and at the Large Hadron Collider (Pb + Pb collisions at root s(NN) = 2.76 TeV). The v(2)(pT) values for fixed pT rise with increasing collision energy within the pT range studied (
Published: 2012

26. Longitudinal and transverse spin asymmetries for inclusive jet production at mid-rapidity in polarizedp+pcollisions ats=200 GeV

Author: L. Adamczyk, G. Agakishiev, M. M. Aggarwal, Z. Ahammed, A. V. Alakhverdyants, I. Alekseev, J. Alford, B. D. Anderson, C. D. Anson, D. Arkhipkin, E. Aschenauer, G. S. Averichev, J. Balewski, A. Banerjee, Z. Barnovska, D. R. Beavis, R. Bellwied, M. J. Betancourt, R. R. Betts, A. Bhasin, A. K. Bhati, H. Bichsel, J. Bielcik, J. Bielcikova, L. C. Bland, I. G. Bordyuzhin, W. Borowski, J. Bouchet, A. V. Brandin, A. Bridgeman, S. G. Brovko, E. Bruna, S. Bueltmann, I. Bunzarov, T. P. Burton, J. Butterworth, X. Z. Cai, H. Caines, M. Calderón de la Barca Sánchez, D. Cebra, R. Cendejas, M. C. Cervantes, P. Chaloupka, S. Chattopadhyay, H. F. Chen, J. H. Chen, J. Y. Chen, L. Chen, J. Cheng, M. Cherney, A. Chikanian, W. Christie, P. Chung, J. Chwastowski, M. J. M. Codrington, R. Corliss, J. G. Cramer, H. J. Crawford, X. Cui, A. Davila Leyva, L. C. De Silva, R. R. Debbe, T. G. Dedovich, J. Deng, R. Derradi de Souza, S. Dhamija, L. Didenko, F. Ding, A. Dion, P. Djawotho, X. Dong, J. L. Drachenberg, J. E. Draper, C. M. Du, L. E. Dunkelberger, J. C. Dunlop, L. G. Efimov, M. Elnimr, J. Engelage, G. Eppley, L. Eun, O. Evdokimov, R. Fatemi, S. Fazio, J. Fedorisin, R. G. Fersch, P. Filip, E. Finch, Y. Fisyak, C. A. Gagliardi, D. R. Gangadharan, F. Geurts, S. Gliske, Y. N. Gorbunov, O. G. Grebenyuk, D. Grosnick, S. Gupta, W. Guryn, B. Haag, O. Hajkova, A. Hamed, L-X. Han, J. W. Harris, J. P. Hays-Wehle, S. Heppelmann, A. Hirsch, G. W. Hoffmann, D. J. Hofman, S. Horvat, B. Huang, H. Z. Huang, P. Huck, T. J. Humanic, L. Huo, G. Igo, W. W. Jacobs, C. Jena, J. Joseph, E. G. Judd, S. Kabana, K. Kang, J. Kapitan, K. Kauder, H. W. Ke, D. Keane, A. Kechechyan, A. Kesich, D. Kettler, D. P. Kikola, J. Kiryluk, A. Kisiel, V. Kizka, S. R. Klein, D. D. Koetke, T. Kollegger, J. Konzer, I. Koralt, L. Koroleva, W. Korsch, L. Kotchenda, K. Kowalik, P. Kravtsov, K. Krueger, L. Kumar, M. A. C. Lamont, J. M. Landgraf, S. LaPointe, J. Lauret, A. Lebedev, R. Lednicky, J. H. Lee, W. Leight, M. J. LeVine, C. Li, L. Li, W. Li, X. Li, Y. Li, Z. M. Li, L. M. Lima, M. A. Lisa, F. Liu, T. Ljubicic, W. J. Llope, R. S. Longacre, Y. Lu, X. Luo, A. Luszczak, G. L. Ma, Y. G. Ma, D. M. M. D. Madagodagettige Don, D. P. Mahapatra, R. Majka, O. I. Mall, S. Margetis, C. Markert, H. Masui, H. S. Matis, D. McDonald, T. S. McShane, J. Millane, S. Mioduszewski, M. K. Mitrovski, Y. Mohammed, B. Mohanty, M. M. Mondal, B. Morozov, M. G. Munhoz, M. K. Mustafa, M. Naglis, B. K. Nandi, Md. Nasim, T. K. Nayak, L. V. Nogach, J. Novak, G. Odyniec, A. Ogawa, K. Oh, A. Ohlson, V. Okorokov, E. W. Oldag, R. A. N. Oliveira, D. Olson, P. Ostrowski, M. Pachr, B. S. Page, S. K. Pal, Y. X. Pan, Y. Pandit, Y. Panebratsev, T. Pawlak, B. Pawlik, H. Pei, C. Perkins, W. Peryt, P. Pile, M. Planinic, J. Pluta, D. Plyku, N. Poljak, J. Porter, A. M. Poskanzer, C. B. Powell, D. Prindle, C. Pruneau, N. K. Pruthi, M. Przybycien, P. R. Pujahari, J. Putschke, H. Qiu, R. Raniwala, S. Raniwala, R. L. Ray, R. Redwine, R. Reed, C. K. Riley, H. G. Ritter, J. B. Roberts, O. V. Rogachevskiy, J. L. Romero, J. F. Ross, L. Ruan, J. Rusnak, N. R. Sahoo, I. Sakrejda, T. Sakuma, S. Salur, A. Sandacz, J. Sandweiss, E. Sangaline, A. Sarkar, M. Sarsour, J. Schambach, R. P. Scharenberg, A. M. Schmah, B. Schmidke, N. Schmitz, T. R. Schuster, J. Seele, J. Seger, P. Seyboth, N. Shah, E. Shahaliev, M. Shao, B. Sharma, M. Sharma, S. S. Shi, Q. Y. Shou, E. P. Sichtermann, R. N. Singaraju, M. J. Skoby, D. Smirnov, N. Smirnov, D. Solanki, P. Sorensen, U. G. deSouza, H. M. Spinka, B. Srivastava, T. D. S. Stanislaus, D. Staszak, S. G. Steadman, J. R. Stevens, R. Stock, M. Strikhanov, B. Stringfellow, A. A. P. Suaide, M. C. Suarez, M. Sumbera, X. M. Sun, Y. Sun, Z. Sun, B. Surrow, D. N. Svirida, T. J. M. Symons, A. Szanto de Toledo, J. Takahashi, A. H. Tang, Z. Tang, L. H. Tarini, T. Tarnowsky, D. Thein, J. H. Thomas, J. Tian, A. R. Timmins, D. Tlusty, M. Tokarev, T. A. Trainor, S. Trentalange, R. E. Tribble, P. Tribedy, B. A. Trzeciak, O. D. Tsai, J. Turnau, T. Ullrich, D. G. Underwood, G. Van Buren, G. van Nieuwenhuizen, J. A. Vanfossen, R. Varma, G. M. S. Vasconcelos, F. Videbæk, Y. P. Viyogi, S. Vokal, S. A. Voloshin, A. Vossen, M. Wada, F. Wang, G. Wang, H. Wang, J. S. Wang, Q. Wang, X. L. Wang, Y. Wang, G. Webb, J. C. Webb, G. D. Westfall, C. Whitten, H. Wieman, S. W. Wissink, R. Witt, W. Witzke, Y. F. Wu, Z. Xiao, W. Xie, K. Xin, H. Xu, N. Xu, Q. H. Xu, W. Xu, Y. Xu, Z. Xu, L. Xue, Y. Yang, P. Yepes, Y. Yi, K. Yip, I-K. Yoo, M. Zawisza, H. Zbroszczyk, J. B. Zhang, S. Zhang, W. M. Zhang, X. P. Zhang, Y. Zhang, Z. P. Zhang, F. Zhao, J. Zhao, C. Zhong, X. Zhu, Y. H. Zhu, and Y. Zoulkarneeva
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, media_common.quotation_subject, Sigma, Polarization (waves), 01 natural sciences, Asymmetry, Gluon, Nuclear physics, Transverse plane, 0103 physical sciences, High Energy Physics::Experiment, Rapidity, Nuclear Experiment, 010306 general physics, Nucleon, Relativistic Heavy Ion Collider, media_common
Abstract: We report STAR measurements of the longitudinal double-spin asymmetry A_LL, the transverse single-spin asymmetry A_N, and the transverse double-spin asymmetries A_Sigma and A_TT for inclusive jet production at mid-rapidity in polarized p+p collisions at a center-of-mass energy of sqrt{s} = 200 GeV. The data represent integrated luminosities of 7.6 /pb with longitudinal polarization and 1.8 /pb with transverse polarization, with 50-55% beam polarization, and were recorded in 2005 and 2006. No evidence is found for the existence of statistically significant jet A_N, A_Sigma, or A_TT at mid-rapidity. Recent model calculations indicate the A_N results may provide new limits on the gluon Sivers distribution in the proton. The asymmetry A_LL significantly improves the knowledge of gluon polarization in the nucleon.
Published: 2012

27. Di-electron spectrum at mid-rapidity inp+pcollisions ats=200GeV

Author: L. Adamczyk, G. Agakishiev, M. M. Aggarwal, Z. Ahammed, A. V. Alakhverdyants, I. Alekseev, J. Alford, B. D. Anderson, C. D. Anson, D. Arkhipkin, E. Aschenauer, G. S. Averichev, J. Balewski, A. Banerjee, Z. Barnovska, D. R. Beavis, R. Bellwied, M. J. Betancourt, R. R. Betts, A. Bhasin, A. K. Bhati, H. Bichsel, J. Bielcik, J. Bielcikova, L. C. Bland, I. G. Bordyuzhin, W. Borowski, J. Bouchet, A. V. Brandin, S. G. Brovko, E. Bruna, S. Bueltmann, I. Bunzarov, T. P. Burton, J. Butterworth, X. Z. Cai, H. Caines, M. Calderón de la Barca Sánchez, D. Cebra, R. Cendejas, M. C. Cervantes, P. Chaloupka, Z. Chang, S. Chattopadhyay, H. F. Chen, J. H. Chen, J. Y. Chen, L. Chen, J. Cheng, M. Cherney, A. Chikanian, W. Christie, P. Chung, J. Chwastowski, M. J. M. Codrington, R. Corliss, J. G. Cramer, H. J. Crawford, X. Cui, A. Davila Leyva, L. C. De Silva, R. R. Debbe, T. G. Dedovich, J. Deng, R. Derradi de Souza, S. Dhamija, L. Didenko, F. Ding, A. Dion, P. Djawotho, X. Dong, J. L. Drachenberg, J. E. Draper, C. M. Du, L. E. Dunkelberger, J. C. Dunlop, L. G. Efimov, M. Elnimr, J. Engelage, G. Eppley, L. Eun, O. Evdokimov, R. Fatemi, S. Fazio, J. Fedorisin, R. G. Fersch, P. Filip, E. Finch, Y. Fisyak, C. A. Gagliardi, D. R. Gangadharan, F. Geurts, A. Gibson, S. Gliske, Y. N. Gorbunov, O. G. Grebenyuk, D. Grosnick, S. Gupta, W. Guryn, B. Haag, O. Hajkova, A. Hamed, L-X. Han, J. W. Harris, J. P. Hays-Wehle, S. Heppelmann, A. Hirsch, G. W. Hoffmann, D. J. Hofman, S. Horvat, B. Huang, H. Z. Huang, P. Huck, T. J. Humanic, L. Huo, G. Igo, W. W. Jacobs, C. Jena, J. Joseph, E. G. Judd, S. Kabana, K. Kang, J. Kapitan, K. Kauder, H. W. Ke, D. Keane, A. Kechechyan, A. Kesich, D. Kettler, D. P. Kikola, J. Kiryluk, A. Kisiel, V. Kizka, S. R. Klein, D. D. Koetke, T. Kollegger, J. Konzer, I. Koralt, L. Koroleva, W. Korsch, L. Kotchenda, P. Kravtsov, K. Krueger, L. Kumar, M. A. C. Lamont, J. M. Landgraf, S. LaPointe, J. Lauret, A. Lebedev, R. Lednicky, J. H. Lee, W. Leight, M. J. LeVine, C. Li, L. Li, W. Li, X. Li, Y. Li, Z. M. Li, L. M. Lima, M. A. Lisa, F. Liu, T. Ljubicic, W. J. Llope, R. S. Longacre, Y. Lu, X. Luo, A. Luszczak, G. L. Ma, Y. G. Ma, D. M. M. D. Madagodagettige Don, D. P. Mahapatra, R. Majka, O. I. Mall, S. Margetis, C. Markert, H. Masui, H. S. Matis, D. McDonald, T. S. McShane, S. Mioduszewski, M. K. Mitrovski, Y. Mohammed, B. Mohanty, M. M. Mondal, B. Morozov, M. G. Munhoz, M. K. Mustafa, M. Naglis, B. K. Nandi, Md. Nasim, T. K. Nayak, L. V. Nogach, J. Novak, G. Odyniec, A. Ogawa, K. Oh, A. Ohlson, V. Okorokov, E. W. Oldag, R. A. N. Oliveira, D. Olson, P. Ostrowski, M. Pachr, B. S. Page, S. K. Pal, Y. X. Pan, Y. Pandit, Y. Panebratsev, T. Pawlak, B. Pawlik, H. Pei, C. Perkins, W. Peryt, P. Pile, M. Planinic, J. Pluta, D. Plyku, N. Poljak, J. Porter, A. M. Poskanzer, C. B. Powell, D. Prindle, C. Pruneau, N. K. Pruthi, M. Przybycien, P. R. Pujahari, J. Putschke, H. Qiu, R. Raniwala, S. Raniwala, R. L. Ray, R. Redwine, R. Reed, C. K. Riley, H. G. Ritter, J. B. Roberts, O. V. Rogachevskiy, J. L. Romero, J. F. Ross, L. Ruan, J. Rusnak, N. R. Sahoo, I. Sakrejda, S. Salur, A. Sandacz, J. Sandweiss, E. Sangaline, A. Sarkar, J. Schambach, R. P. Scharenberg, A. M. Schmah, B. Schmidke, N. Schmitz, T. R. Schuster, J. Seele, J. Seger, P. Seyboth, N. Shah, E. Shahaliev, M. Shao, B. Sharma, M. Sharma, S. S. Shi, Q. Y. Shou, E. P. Sichtermann, R. N. Singaraju, M. J. Skoby, D. Smirnov, N. Smirnov, D. Solanki, P. Sorensen, U. G. deSouza, H. M. Spinka, B. Srivastava, T. D. S. Stanislaus, S. G. Steadman, J. R. Stevens, R. Stock, M. Strikhanov, B. Stringfellow, A. A. P. Suaide, M. C. Suarez, M. Sumbera, X. M. Sun, Y. Sun, Z. Sun, B. Surrow, D. N. Svirida, T. J. M. Symons, A. Szanto de Toledo, J. Takahashi, A. H. Tang, Z. Tang, L. H. Tarini, T. Tarnowsky, D. Thein, J. H. Thomas, J. Tian, A. R. Timmins, D. Tlusty, M. Tokarev, T. A. Trainor, S. Trentalange, R. E. Tribble, P. Tribedy, B. A. Trzeciak, O. D. Tsai, J. Turnau, T. Ullrich, D. G. Underwood, G. Van Buren, G. van Nieuwenhuizen, J. A. Vanfossen, R. Varma, G. M. S. Vasconcelos, F. Videbæk, Y. P. Viyogi, S. Vokal, S. A. Voloshin, A. Vossen, M. Wada, F. Wang, G. Wang, H. Wang, J. S. Wang, Q. Wang, X. L. Wang, Y. Wang, G. Webb, J. C. Webb, G. D. Westfall, C. Whitten, H. Wieman, S. W. Wissink, R. Witt, W. Witzke, Y. F. Wu, Z. Xiao, W. Xie, K. Xin, H. Xu, N. Xu, Q. H. Xu, W. Xu, Y. Xu, Z. Xu, L. Xue, Y. Yang, P. Yepes, Y. Yi, K. Yip, I-K. Yoo, M. Zawisza, H. Zbroszczyk, J. B. Zhang, S. Zhang, W. M. Zhang, X. P. Zhang, Y. Zhang, Z. P. Zhang, F. Zhao, J. Zhao, C. Zhong, X. Zhu, Y. H. Zhu, and Y. Zoulkarneeva
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Meson, 010308 nuclear & particles physics, Branching fraction, High Energy Physics::Phenomenology, 01 natural sciences, 7. Clean energy, Omega, Particle identification, Nuclear physics, Pseudoscalar, 0103 physical sciences, Mass spectrum, High Energy Physics::Experiment, Rapidity, Nuclear Experiment, 010306 general physics, Relativistic Heavy Ion Collider
Abstract: We report on the mid-rapidity mass spectrum of di-electrons and cross sections of pseudoscalar and vector mesons via e(+) e(-) decays, from root s = 200 GeV p + p collisions, measured by the large-acceptance experiment STAR at the Relativistic Heavy Ion Collider. The ratio of the di-electron continuum to the combinatorial background is larger than 10% over the entire mass range. Simulations of di-electrons from light-meson decays and heavy-flavor decays (charmonium and open charm correlation) are found to describe the data. The extracted omega -> e(+) e(-) invariant yields are consistent with previous measurements. The mid-rapidity yields (dN/dy) of phi and J/psi are extracted through their di-electron decay channels and are consistent with the previous measurements of phi -> K+ K- and J/psi -> e(+) e(-). Our results suggest a new upper limit of the branching ratio of the eta -> e(+) e(-) of 1.7 x 10(-5) at the 90% confidence level.
Published: 2012

28. Energy and system-size dependence of two- and four-particlev2measurements in heavy-ion collisions atsNN=62.4and 200 GeV and their implications on flow fluctuations and nonflow

Author: G. Agakishiev, M. M. Aggarwal, Z. Ahammed, A. V. Alakhverdyants, I. Alekseev, J. Alford, B. D. Anderson, C. D. Anson, D. Arkhipkin, G. S. Averichev, J. Balewski, D. R. Beavis, N. K. Behera, R. Bellwied, M. J. Betancourt, R. R. Betts, A. Bhasin, A. K. Bhati, H. Bichsel, J. Bielcik, J. Bielcikova, L. C. Bland, I. G. Bordyuzhin, W. Borowski, J. Bouchet, E. Braidot, A. V. Brandin, A. Bridgeman, S. G. Brovko, E. Bruna, S. Bueltmann, I. Bunzarov, T. P. Burton, X. Z. Cai, H. Caines, M. Calderón de la Barca Sánchez, D. Cebra, R. Cendejas, M. C. Cervantes, P. Chaloupka, S. Chattopadhyay, H. F. Chen, J. H. Chen, J. Y. Chen, L. Chen, J. Cheng, M. Cherney, A. Chikanian, K. E. Choi, W. Christie, P. Chung, M. J. M. Codrington, R. Corliss, J. G. Cramer, H. J. Crawford, X. Cui, A. Davila Leyva, L. C. De Silva, R. R. Debbe, T. G. Dedovich, J. Deng, A. A. Derevschikov, R. Derradi de Souza, L. Didenko, P. Djawotho, X. Dong, J. L. Drachenberg, J. E. Draper, C. M. Du, J. C. Dunlop, L. G. Efimov, M. Elnimr, J. Engelage, G. Eppley, M. Estienne, L. Eun, O. Evdokimov, R. Fatemi, J. Fedorisin, R. G. Fersch, P. Filip, E. Finch, V. Fine, Y. Fisyak, C. A. Gagliardi, D. R. Gangadharan, F. Geurts, P. Ghosh, Y. N. Gorbunov, A. Gordon, O. G. Grebenyuk, D. Grosnick, A. Gupta, S. Gupta, W. Guryn, B. Haag, O. Hajkova, A. Hamed, L-X. Han, J. W. Harris, J. P. Hays-Wehle, M. Heinz, S. Heppelmann, A. Hirsch, G. W. Hoffmann, D. J. Hofman, B. Huang, H. Z. Huang, T. J. Humanic, L. Huo, G. Igo, W. W. Jacobs, C. Jena, F. Jin, J. Joseph, E. G. Judd, S. Kabana, K. Kang, J. Kapitan, K. Kauder, H. W. Ke, D. Keane, A. Kechechyan, D. Kettler, D. P. Kikola, J. Kiryluk, A. Kisiel, V. Kizka, S. R. Klein, A. G. Knospe, D. D. Koetke, T. Kollegger, J. Konzer, I. Koralt, L. Koroleva, W. Korsch, L. Kotchenda, V. Kouchpil, P. Kravtsov, K. Krueger, M. Krus, L. Kumar, M. A. C. Lamont, J. M. Landgraf, S. LaPointe, J. Lauret, A. Lebedev, R. Lednicky, J. H. Lee, W. Leight, M. J. LeVine, C. Li, L. Li, N. Li, W. Li, X. Li, Y. Li, Z. M. Li, L. M. Lima, M. A. Lisa, F. Liu, H. Liu, J. Liu, T. Ljubicic, W. J. Llope, R. S. Longacre, Y. Lu, E. V. Lukashov, X. Luo, G. L. Ma, Y. G. Ma, D. P. Mahapatra, R. Majka, O. I. Mall, R. Manweiler, S. Margetis, C. Markert, H. Masui, H. S. Matis, D. McDonald, T. S. McShane, A. Meschanin, R. Milner, N. G. Minaev, S. Mioduszewski, M. K. Mitrovski, Y. Mohammed, B. Mohanty, M. M. Mondal, B. Morozov, D. A. Morozov, M. G. Munhoz, M. K. Mustafa, M. Naglis, B. K. Nandi, T. K. Nayak, L. V. Nogach, S. B. Nurushev, G. Odyniec, A. Ogawa, K. Oh, A. Ohlson, V. Okorokov, E. W. Oldag, R. A. N. Oliveira, D. Olson, M. Pachr, B. S. Page, S. K. Pal, Y. Pandit, Y. Panebratsev, T. Pawlak, H. Pei, T. Peitzmann, C. Perkins, W. Peryt, P. Pile, M. Planinic, J. Pluta, D. Plyku, N. Poljak, J. Porter, A. M. Poskanzer, C. B. Powell, D. Prindle, C. Pruneau, N. K. Pruthi, P. R. Pujahari, J. Putschke, H. Qiu, R. Raniwala, S. Raniwala, R. Redwine, R. Reed, H. G. Ritter, J. B. Roberts, O. V. Rogachevskiy, J. L. Romero, L. Ruan, J. Rusnak, N. R. Sahoo, I. Sakrejda, S. Salur, J. Sandweiss, E. Sangaline, A. Sarkar, J. Schambach, R. P. Scharenberg, J. Schaub, A. M. Schmah, N. Schmitz, T. R. Schuster, J. Seele, J. Seger, I. Selyuzhenkov, P. Seyboth, N. Shah, E. Shahaliev, M. Shao, B. Sharma, M. Sharma, S. S. Shi, Q. Y. Shou, E. P. Sichtermann, F. Simon, R. N. Singaraju, M. J. Skoby, N. Smirnov, D. Solanki, P. Sorensen, U. G. de Souza, H. M. Spinka, B. Srivastava, T. D. S. Stanislaus, S. G. Steadman, J. R. Stevens, R. Stock, M. Strikhanov, B. Stringfellow, A. A. P. Suaide, M. C. Suarez, N. L. Subba, M. Sumbera, X. M. Sun, Y. Sun, Z. Sun, B. Surrow, D. N. Svirida, T. J. M. Symons, A. Szanto de Toledo, J. Takahashi, A. H. Tang, Z. Tang, L. H. Tarini, T. Tarnowsky, D. Thein, J. H. Thomas, J. Tian, A. R. Timmins, D. Tlusty, M. Tokarev, S. Trentalange, R. E. Tribble, P. Tribedy, B. A. Trzeciak, O. D. Tsai, T. Ullrich, D. G. Underwood, G. Van Buren, G. van Nieuwenhuizen, J. A. Vanfossen, R. Varma, G. M. S. Vasconcelos, A. N. Vasiliev, F. Videbæk, Y. P. Viyogi, S. Vokal, S. A. Voloshin, M. Wada, M. Walker, F. Wang, G. Wang, H. Wang, J. S. Wang, Q. Wang, X. L. Wang, Y. Wang, G. Webb, J. C. Webb, G. D. Westfall, C. Whitten, H. Wieman, S. W. Wissink, R. Witt, W. Witzke, Y. F. Wu, Z. Xiao, W. Xie, H. Xu, N. Xu, Q. H. Xu, W. Xu, Y. Xu, Z. Xu, L. Xue, Y. Yang, P. Yepes, K. Yip, I-K. Yoo, M. Zawisza, H. Zbroszczyk, W. Zhan, J. B. Zhang, S. Zhang, W. M. Zhang, X. P. Zhang, Y. Zhang, Z. P. Zhang, F. Zhao, J. Zhao, C. Zhong, X. Zhu, Y. H. Zhu, and Y. Zoulkarneeva
Subjects: Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, media_common.quotation_subject, Star (game theory), Elliptic flow, 01 natural sciences, Azimuth, Nuclear physics, 0103 physical sciences, Particle, Eccentricity (behavior), 010306 general physics, Anisotropy, Cumulant, Energy (signal processing), media_common
Abstract: We present STAR measurements of azimuthal anisotropy by means of the two- and four-particle cumulants v2 (v2{; ; 2}; ; and v2{; ; 4}; ; ) for Au+Au and Cu+Cu collisions at center-of-mass energies √sNN=62.4 and 200 GeV. The difference between v2{; ; 2}; ; 2 and v2{; ; 4}; ; 2 is related to v2 fluctuations (σv2) and nonflow (δ2). We present an upper limit to σv2/v2. Following the assumption that eccentricity fluctuations σɛ dominate v2 fluctuations σv2/v2≈σɛ/ɛ we deduce the nonflow implied for several models of eccentricity fluctuations that would be required for consistency with v2{; ; 2}; ; and v2{; ; 4}; ; . We also present results on the ratio of v2 to eccentricity.
Published: 2012

29. ρ0photoproduction in AuAu collisions atsNN=62.4GeV measured with the STAR detector

Author: G. Agakishiev, M. M. Aggarwal, Z. Ahammed, A. V. Alakhverdyants, I. Alekseev, J. Alford, B. D. Anderson, C. D. Anson, D. Arkhipkin, G. S. Averichev, J. Balewski, D. R. Beavis, N. K. Behera, R. Bellwied, M. J. Betancourt, R. R. Betts, A. Bhasin, A. K. Bhati, H. Bichsel, J. Bielcik, J. Bielcikova, L. C. Bland, I. G. Bordyuzhin, W. Borowski, J. Bouchet, E. Braidot, A. V. Brandin, A. Bridgeman, S. G. Brovko, E. Bruna, S. Bueltmann, I. Bunzarov, T. P. Burton, X. Z. Cai, H. Caines, M. Calderón de la Barca Sánchez, D. Cebra, R. Cendejas, M. C. Cervantes, P. Chaloupka, S. Chattopadhyay, H. F. Chen, J. H. Chen, J. Y. Chen, L. Chen, J. Cheng, M. Cherney, A. Chikanian, K. E. Choi, W. Christie, P. Chung, M. J. M. Codrington, R. Corliss, J. G. Cramer, H. J. Crawford, A. Davila Leyva, L. C. De Silva, R. R. Debbe, T. G. Dedovich, J. Deng, A. A. Derevschikov, R. Derradi de Souza, L. Didenko, P. Djawotho, S. M. Dogra, X. Dong, J. L. Drachenberg, J. E. Draper, C. M. Du, J. C. Dunlop, L. G. Efimov, M. Elnimr, J. Engelage, G. Eppley, M. Estienne, L. Eun, O. Evdokimov, R. Fatemi, J. Fedorisin, R. G. Fersch, P. Filip, E. Finch, V. Fine, Y. Fisyak, C. A. Gagliardi, F. Geurts, P. Ghosh, Y. N. Gorbunov, A. Gordon, O. G. Grebenyuk, D. Grosnick, A. Gupta, S. Gupta, W. Guryn, B. Haag, O. Hajkova, A. Hamed, L-X. Han, J. W. Harris, J. P. Hays-Wehle, M. Heinz, S. Heppelmann, A. Hirsch, E. Hjort, G. W. Hoffmann, D. J. Hofman, B. Huang, H. Z. Huang, T. J. Humanic, L. Huo, G. Igo, P. Jacobs, W. W. Jacobs, C. Jena, F. Jin, J. Joseph, E. G. Judd, S. Kabana, K. Kang, J. Kapitan, K. Kauder, H. W. Ke, D. Keane, A. Kechechyan, D. Kettler, D. P. Kikola, J. Kiryluk, A. Kisiel, V. Kizka, S. R. Klein, A. G. Knospe, D. D. Koetke, T. Kollegger, J. Konzer, I. Koralt, L. Koroleva, W. Korsch, L. Kotchenda, V. Kouchpil, P. Kravtsov, K. Krueger, M. Krus, L. Kumar, M. A. C. Lamont, J. M. Landgraf, S. LaPointe, J. Lauret, A. Lebedev, R. Lednicky, J. H. Lee, W. Leight, M. J. LeVine, C. Li, L. Li, N. Li, W. Li, X. Li, Y. Li, Z. M. Li, L. M. Lima, M. A. Lisa, F. Liu, H. Liu, J. Liu, T. Ljubicic, W. J. Llope, R. S. Longacre, Y. Lu, E. V. Lukashov, X. Luo, G. L. Ma, Y. G. Ma, D. P. Mahapatra, R. Majka, O. I. Mall, R. Manweiler, S. Margetis, C. Markert, H. Masui, H. S. Matis, D. McDonald, T. S. McShane, A. Meschanin, R. Milner, N. G. Minaev, S. Mioduszewski, M. K. Mitrovski, Y. Mohammed, B. Mohanty, M. M. Mondal, B. Morozov, D. A. Morozov, M. G. Munhoz, M. K. Mustafa, M. Naglis, B. K. Nandi, T. K. Nayak, L. V. Nogach, S. B. Nurushev, G. Odyniec, A. Ogawa, K. Oh, A. Ohlson, V. Okorokov, E. W. Oldag, R. A. N. Oliveira, D. Olson, M. Pachr, B. S. Page, S. K. Pal, Y. Pandit, Y. Panebratsev, T. Pawlak, H. Pei, T. Peitzmann, C. Perkins, W. Peryt, P. Pile, M. Planinic, M. A. Ploskon, J. Pluta, D. Plyku, N. Poljak, J. Porter, A. M. Poskanzer, B. V. K. S. Potukuchi, C. B. Powell, D. Prindle, C. Pruneau, N. K. Pruthi, P. R. Pujahari, J. Putschke, H. Qiu, R. Raniwala, S. Raniwala, R. L. Ray, R. Redwine, R. Reed, H. G. Ritter, J. B. Roberts, O. V. Rogachevskiy, J. L. Romero, L. Ruan, J. Rusnak, N. R. Sahoo, I. Sakrejda, S. Salur, J. Sandweiss, E. Sangaline, A. Sarkar, J. Schambach, R. P. Scharenberg, J. Schaub, A. M. Schmah, N. Schmitz, T. R. Schuster, J. Seele, J. Seger, I. Selyuzhenkov, P. Seyboth, N. Shah, E. Shahaliev, M. Shao, M. Sharma, S. S. Shi, Q. Y. Shou, E. P. Sichtermann, F. Simon, R. N. Singaraju, M. J. Skoby, N. Smirnov, D. Solanki, P. Sorensen, U. G. deSouza, H. M. Spinka, B. Srivastava, T. D. S. Stanislaus, S. G. Steadman, J. R. Stevens, R. Stock, M. Strikhanov, B. Stringfellow, A. A. P. Suaide, M. C. Suarez, N. L. Subba, M. Sumbera, X. M. Sun, Y. Sun, Z. Sun, B. Surrow, D. N. Svirida, T. J. M. Symons, A. Szanto de Toledo, J. Takahashi, A. H. Tang, Z. Tang, L. H. Tarini, T. Tarnowsky, D. Thein, J. H. Thomas, J. Tian, A. R. Timmins, D. Tlusty, M. Tokarev, T. A. Trainor, S. Trentalange, R. E. Tribble, P. Tribedy, B. A. Trzeciak, O. D. Tsai, T. Ullrich, D. G. Underwood, G. Van Buren, G. van Nieuwenhuizen, J. A. Vanfossen, R. Varma, G. M. S. Vasconcelos, A. N. Vasiliev, F. Videbæk, Y. P. Viyogi, S. Vokal, S. A. Voloshin, M. Wada, M. Walker, F. Wang, G. Wang, H. Wang, J. S. Wang, Q. Wang, X. L. Wang, Y. Wang, G. Webb, J. C. Webb, G. D. Westfall, C. Whitten, H. Wieman, S. W. Wissink, R. Witt, W. Witzke, Y. F. Wu, Z. Xiao, W. Xie, H. Xu, N. Xu, Q. H. Xu, W. Xu, Y. Xu, Z. Xu, L. Xue, Y. Yang, P. Yepes, K. Yip, I-K. Yoo, M. Zawisza, H. Zbroszczyk, W. Zhan, J. B. Zhang, S. Zhang, W. M. Zhang, X. P. Zhang, Y. Zhang, Z. P. Zhang, F. Zhao, J. Zhao, C. Zhong, X. Zhu, Y. H. Zhu, and Y. Zoulkarneeva
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Meson, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Theoretical models, Virtual particle, 01 natural sciences, Nuclear physics, medicine.anatomical_structure, 0103 physical sciences, medicine, High Energy Physics::Experiment, Vector meson, Center of mass, Nuclear Experiment, 010306 general physics, Relativistic Heavy Ion Collider, Nucleus, STAR detector
Abstract: Vector mesons may be photoproduced in relativistic heavy-ion collisions when a virtual photon emitted by one nucleus scatters from the other nucleus, emerging as a vector meson. The STAR Collaboration has previously presented measurements of coherent rho(0) photoproduction at center of mass energies of 130 GeV and 200 GeV in AuAu collisions. Here, we present a measurement of the cross section at 62.4 GeV; we find that the cross section for coherent rho(0) photoproduction with nuclear breakup is 10.5 +/- 1.5 +/- 1.6mb at 62.4 GeV. The cross-section ratio between 200 GeV and 62.4 GeV is 4.4 +/- 0.6, less than is predicted by most theoretical models. It is, however, proportionally much larger than the previously observed 15% +/- 55% increase between 130 GeV and 200 GeV.
Published: 2012

30. Directed and elliptic flow of charged particles in Cu+Cu collisions atsNN=22.4GeV

Author: G. Agakishiev, M. M. Aggarwal, Z. Ahammed, A. V. Alakhverdyants, I. Alekseev, J. Alford, B. D. Anderson, C. D. Anson, D. Arkhipkin, G. S. Averichev, J. Balewski, D. R. Beavis, N. K. Behera, R. Bellwied, M. J. Betancourt, R. R. Betts, A. Bhasin, A. K. Bhati, H. Bichsel, J. Bielcik, J. Bielcikova, L. C. Bland, I. G. Bordyuzhin, W. Borowski, J. Bouchet, E. Braidot, A. V. Brandin, A. Bridgeman, S. G. Brovko, E. Bruna, S. Bueltmann, I. Bunzarov, T. P. Burton, X. Z. Cai, H. Caines, M. Calderón de la Barca Sánchez, D. Cebra, R. Cendejas, M. C. Cervantes, P. Chaloupka, S. Chattopadhyay, H. F. Chen, J. H. Chen, J. Y. Chen, L. Chen, J. Cheng, M. Cherney, A. Chikanian, K. E. Choi, W. Christie, P. Chung, M. J. M. Codrington, R. Corliss, J. G. Cramer, H. J. Crawford, null Cui, A. Davila Leyva, L. C. De Silva, R. R. Debbe, T. G. Dedovich, J. Deng, A. A. Derevschikov, R. Derradi de Souza, L. Didenko, P. Djawotho, S. M. Dogra, X. Dong, J. L. Drachenberg, J. E. Draper, C. M. Du, J. C. Dunlop, L. G. Efimov, M. Elnimr, J. Engelage, G. Eppley, M. Estienne, L. Eun, O. Evdokimov, R. Fatemi, J. Fedorisin, R. G. Fersch, P. Filip, E. Finch, V. Fine, Y. Fisyak, C. A. Gagliardi, D. R. Gangadharan, F. Geurts, P. Ghosh, Y. N. Gorbunov, A. Gordon, O. G. Grebenyuk, D. Grosnick, A. Gupta, S. Gupta, W. Guryn, B. Haag, O. Hajkova, A. Hamed, L.-X. Han, J. W. Harris, J. P. Hays-Wehle, M. Heinz, S. Heppelmann, A. Hirsch, E. Hjort, G. W. Hoffmann, D. J. Hofman, B. Huang, H. Z. Huang, T. J. Humanic, L. Huo, G. Igo, P. Jacobs, W. W. Jacobs, C. Jena, F. Jin, J. Joseph, E. G. Judd, S. Kabana, K. Kang, J. Kapitan, K. Kauder, H. W. Ke, D. Keane, A. Kechechyan, D. Kettler, D. P. Kikola, J. Kiryluk, A. Kisiel, V. Kizka, S. R. Klein, A. G. Knospe, D. D. Koetke, T. Kollegger, J. Konzer, I. Koralt, L. Koroleva, W. Korsch, L. Kotchenda, V. Kouchpil, P. Kravtsov, K. Krueger, M. Krus, L. Kumar, M. A. C. Lamont, J. M. Landgraf, S. LaPointe, J. Lauret, A. Lebedev, R. Lednicky, J. H. Lee, W. Leight, M. J. LeVine, C. Li, L. Li, N. Li, W. Li, X. Li, Y. Li, Z. M. Li, L. M. Lima, M. A. Lisa, F. Liu, H. Liu, J. Liu, T. Ljubicic, W. J. Llope, R. S. Longacre, Y. Lu, E. V. Lukashov, X. Luo, G. L. Ma, Y. G. Ma, D. P. Mahapatra, R. Majka, O. I. Mall, R. Manweiler, S. Margetis, C. Markert, H. Masui, H. S. Matis, D. McDonald, T. S. McShane, A. Meschanin, R. Milner, N. G. Minaev, S. Mioduszewski, M. K. Mitrovski, Y. Mohammed, B. Mohanty, M. M. Mondal, B. Morozov, D. A. Morozov, M. G. Munhoz, M. K. Mustafa, M. Naglis, B. K. Nandi, T. K. Nayak, L. V. Nogach, S. B. Nurushev, G. Odyniec, A. Ogawa, K. Oh, A. Ohlson, V. Okorokov, E. W. Oldag, R. A. N. Oliveira, D. Olson, M. Pachr, B. S. Page, S. K. Pal, Y. Pandit, Y. Panebratsev, T. Pawlak, H. Pei, T. Peitzmann, C. Perkins, W. Peryt, P. Pile, M. Planinic, M. A. Ploskon, J. Pluta, D. Plyku, N. Poljak, J. Porter, A. M. Poskanzer, B. V. K. S. Potukuchi, C. B. Powell, D. Prindle, C. Pruneau, N. K. Pruthi, P. R. Pujahari, J. Putschke, H. Qiu, R. Raniwala, S. Raniwala, R. L. Ray, R. Redwine, R. Reed, H. G. Ritter, J. B. Roberts, O. V. Rogachevskiy, J. L. Romero, L. Ruan, J. Rusnak, N. R. Sahoo, I. Sakrejda, S. Salur, J. Sandweiss, E. Sangaline, A. Sarkar, J. Schambach, R. P. Scharenberg, J. Schaub, A. M. Schmah, N. Schmitz, T. R. Schuster, J. Seele, J. Seger, I. Selyuzhenkov, P. Seyboth, N. Shah, E. Shahaliev, M. Shao, M. Sharma, S. S. Shi, Q. Y. Shou, E. P. Sichtermann, F. Simon, R. N. Singaraju, M. J. Skoby, N. Smirnov, D. Solanki, P. Sorensen, U. G. deSouza, H. M. Spinka, B. Srivastava, T. D. S. Stanislaus, S. G. Steadman, J. R. Stevens, R. Stock, M. Strikhanov, B. Stringfellow, A. A. P. Suaide, M. C. Suarez, N. L. Subba, M. Sumbera, X. M. Sun, Y. Sun, Z. Sun, B. Surrow, D. N. Svirida, T. J. M. Symons, A. Szanto de Toledo, J. Takahashi, A. H. Tang, Z. Tang, L. H. Tarini, T. Tarnowsky, D. Thein, J. H. Thomas, J. Tian, A. R. Timmins, D. Tlusty, M. Tokarev, S. Trentalange, R. E. Tribble, P. Tribedy, B. A. Trzeciak, O. D. Tsai, T. Ullrich, D. G. Underwood, G. Van Buren, G. van Nieuwenhuizen, J. A. Vanfossen, R. Varma, G. M. S. Vasconcelos, A. N. Vasiliev, F. Videbæk, Y. P. Viyogi, S. Vokal, S. A. Voloshin, M. Wada, M. Walker, F. Wang, G. Wang, H. Wang, J. S. Wang, Q. Wang, X. L. Wang, Y. Wang, G. Webb, J. C. Webb, G. D. Westfall, C. Whitten, H. Wieman, S. W. Wissink, R. Witt, W. Witzke, Y. F. Wu, Z. Xiao, W. Xie, H. Xu, N. Xu, Q. H. Xu, W. Xu, Y. Xu, Z. Xu, L. Xue, Y. Yang, P. Yepes, K. Yip, I.-K. Yoo, M. Zawisza, H. Zbroszczyk, W. Zhan, J. B. Zhang, S. Zhang, W. M. Zhang, X. P. Zhang, Y. Zhang, Z. P. Zhang, F. Zhao, J. Zhao, C. Zhong, X. Zhu, Y. H. Zhu, and Y. Zoulkarneeva
Subjects: Physics, Nuclear and High Energy Physics, Range (particle radiation), Time projection chamber, Quantitative Biology::Neurons and Cognition, 010308 nuclear & particles physics, Elliptic flow, 01 natural sciences, Charged particle, Nuclear physics, 0103 physical sciences, Quark–gluon plasma, Particle, Atomic physics, Nuclear Experiment, 010306 general physics, Relativistic Heavy Ion Collider, STAR detector
Abstract: This paper reports results for directed flow v1 and elliptic flow v2 of charged particles in Cu + Cu collisions at √sNN=22.4 GeV at the Relativistic Heavy Ion Collider. The measurements are for the 0–60% most central collisions, using charged particles observed in the STAR detector. Our measurements extend to 22.4-GeV Cu + Cu collisions the prior observation that v1 is independent of the system size at 62.4 and 200 GeV and also extend the scaling of v1 with η/ybeam to this system. The measured v2(pT) in Cu + Cu collisions is similar for √sNN throughout the range 22.4 to 200 GeV. We also report a comparison with results from transport model (ultrarelativistic quantum molecular dynamics and multiphase transport model) calculations. The model results do not agree quantitatively with the measured v1(η), v2(pT), and v2(η).
Published: 2012

31. Measurement of the double-spin asymmetry A for inclusive multi-γ pair production with 200 GeV/c polarized proton beam and polarized proton target

Author: T. Iijima, M. D. Corcoran, A. L. Read, D. Grosnick, T. Yoshida, N. Tanaka, A. N. Vasiliev, L. van Rossum, Kozo Miyake, S. B. Nurushev, D. L. Adams, Y. Goto, H M. Spinka, F. Nessi-Tedaldi, V. L. Solovyanov, M. Nessi, M. Laghai, Y. Itow, J. Cranshaw, S. Yamashita, VL Rykov, J. L. White, Akira Masaike, F. Takeutchi, A. A. Derevschikov, K. Krueger, J. Skeens, R. Takashima, G. Durand, P. Schiavon, J. B. Roberts, Fnal E, A. P. Meschanin, K. Iwatani, T. Nagamine, A. Michalowicz, T. Kasprzyk, Yu.A. Matulenko, A. Yokosawa, H. En'yo, G. Salvato, J. Deregel, H. Funahashi, K. Kuroda, G. Pauletta, A. Bravar, N. Tamura, N. I. Belikov, J. Fabre, J. D. Cossairt, N. Saito, O. A. Grachov, F. Luehring, P. Chaumette, J. Shepard, C. Nguyen, A. Penzo, Y. Ohashi, J. Bystricky, D. Lopiano, T. Maki, S. Makino, K. Fukuda, D. H. Miller, D. I. Patalakha, F. Lehar, A. de Lesquen, D. A. Hill, N. Akchurin, D. G. Underwood, K. Imai, A. Villari, Anna Zanetti, and Yasar Onel
Subjects: Physics, Quark, Nuclear and High Energy Physics, Particle physics, Meson, media_common.quotation_subject, Hadron, Monte Carlo method, Asymmetry, Gluon, Nuclear physics, Pair production, High Energy Physics::Experiment, Nucleon, LARGE TRANSVERSE-MOMENTUM, DIRECT PHOTON PRODUCTION, PI-0 PRODUCTION, PP COLLISIONS, 300 GEV/C, DEPENDENCE, SCATTERING, NUCLEON, HADRON, PI+P, media_common
Abstract: The invariant double-differential cross section, E1E2d6 delta/dp(1)3dp(2)3, and the double-spin asymmetry, A(LL), for inclusive multi-gamma pair production in which gamma-rays came from neutral mesons were measured with a 200 GeV/c longitudinally-polarized proton beam and a longitudinally-polarized proton target. Most of the multi-gamma pairs comes from two-jet type events which are sensitive to partonic interaction. The A(LL) values were found to be consistent with zero. The invariant double-differential cross section for inclusive pi0pi0 production was also measured. These measured cross sections are consistent with LUND Monte Carlo simulations. Using the LUND Monte Carlo simulation package with the Carlitz-Kaur model of spin dependent distribution functions of valence quarks, the A(LL) values have been compared with theoretical predictions of gluon polarization, DELTAG/G. The results put restrictions on the size of DELTAG/G in the region of 0.05 less-than-or-similar-to x less-than-or-similar-to 0.35.
Published: 1994

32. K*0production in Cu+Cu and Au+Au collisions atsNN=62.4GeV and 200 GeV

Author: M. M. Aggarwal, Z. Ahammed, A. V. Alakhverdyants, I. Alekseev, J. Alford, B. D. Anderson, C. D. Anson, D. Arkhipkin, G. S. Averichev, J. Balewski, L. S. Barnby, S. Baumgart, D. R. Beavis, R. Bellwied, M. J. Betancourt, R. R. Betts, A. Bhasin, A. K. Bhati, H. Bichsel, J. Bielcik, J. Bielcikova, B. Biritz, L. C. Bland, B. E. Bonner, J. Bouchet, E. Braidot, A. V. Brandin, A. Bridgeman, E. Bruna, S. Bueltmann, I. Bunzarov, T. P. Burton, X. Z. Cai, H. Caines, M. Calderon de la Barca Sanchez, O. Catu, D. Cebra, R. Cendejas, M. C. Cervantes, Z. Chajecki, P. Chaloupka, S. Chattopadhyay, H. F. Chen, J. H. Chen, J. Y. Chen, J. Cheng, M. Cherney, A. Chikanian, K. E. Choi, W. Christie, P. Chung, R. F. Clarke, M. J. M. Codrington, R. Corliss, J. G. Cramer, H. J. Crawford, D. Das, S. Dash, A. Davila Leyva, L. C. De Silva, R. R. Debbe, T. G. Dedovich, A. A. Derevschikov, R. Derradi de Souza, L. Didenko, P. Djawotho, S. M. Dogra, X. Dong, J. L. Drachenberg, J. E. Draper, J. C. Dunlop, M. R. Dutta Mazumdar, L. G. Efimov, E. Elhalhuli, M. Elnimr, J. Engelage, G. Eppley, B. Erazmus, M. Estienne, L. Eun, O. Evdokimov, P. Fachini, R. Fatemi, J. Fedorisin, R. G. Fersch, P. Filip, E. Finch, V. Fine, Y. Fisyak, C. A. Gagliardi, D. R. Gangadharan, M. S. Ganti, E. J. Garcia-Solis, A. Geromitsos, F. Geurts, V. Ghazikhanian, P. Ghosh, Y. N. Gorbunov, A. Gordon, O. Grebenyuk, D. Grosnick, S. M. Guertin, A. Gupta, W. Guryn, B. Haag, A. Hamed, L.-X. Han, J. W. Harris, J. P. Hays-Wehle, M. Heinz, S. Heppelmann, A. Hirsch, E. Hjort, A. M. Hoffman, G. W. Hoffmann, D. J. Hofman, B. Huang, H. Z. Huang, T. J. Humanic, L. Huo, G. Igo, P. Jacobs, W. W. Jacobs, C. Jena, F. Jin, C. L. Jones, P. G. Jones, J. Joseph, E. G. Judd, S. Kabana, K. Kajimoto, K. Kang, J. Kapitan, K. Kauder, D. Keane, A. Kechechyan, D. Kettler, D. P. Kikola, J. Kiryluk, A. Kisiel, S. R. Klein, A. G. Knospe, A. Kocoloski, D. D. Koetke, T. Kollegger, J. Konzer, I. Koralt, L. Koroleva, W. Korsch, L. Kotchenda, V. Kouchpil, P. Kravtsov, K. Krueger, M. Krus, L. Kumar, P. Kurnadi, M. A. C. Lamont, J. M. Landgraf, S. LaPointe, J. Lauret, A. Lebedev, R. Lednicky, C.-H. Lee, J. H. Lee, W. Leight, M. J. LeVine, C. Li, L. Li, N. Li, W. Li, X. Li, Y. Li, Z. M. Li, G. Lin, S. J. Lindenbaum, M. A. Lisa, F. Liu, H. Liu, J. Liu, T. Ljubicic, W. J. Llope, R. S. Longacre, W. A. Love, Y. Lu, E. V. Lukashov, X. Luo, G. L. Ma, Y. G. Ma, D. P. Mahapatra, R. Majka, O. I. Mall, L. K. Mangotra, R. Manweiler, S. Margetis, C. Markert, H. Masui, H. S. Matis, Yu. A. Matulenko, D. McDonald, T. S. McShane, A. Meschanin, R. Milner, N. G. Minaev, S. Mioduszewski, A. Mischke, M. K. Mitrovski, B. Mohanty, M. M. Mondal, B. Morozov, D. A. Morozov, M. G. Munhoz, B. K. Nandi, C. Nattrass, T. K. Nayak, J. M. Nelson, P. K. Netrakanti, M. J. Ng, L. V. Nogach, S. B. Nurushev, G. Odyniec, A. Ogawa, V. Okorokov, E. W. Oldag, D. Olson, M. Pachr, B. S. Page, S. K. Pal, Y. Pandit, Y. Panebratsev, T. Pawlak, T. Peitzmann, V. Perevoztchikov, C. Perkins, W. Peryt, S. C. Phatak, P. Pile, M. Planinic, M. A. Ploskon, J. Pluta, D. Plyku, N. Poljak, A. M. Poskanzer, B. V. K. S. Potukuchi, C. B. Powell, D. Prindle, C. Pruneau, N. K. Pruthi, P. R. Pujahari, J. Putschke, H. Qiu, R. Raniwala, S. Raniwala, R. L. Ray, R. Redwine, R. Reed, H. G. Ritter, J. B. Roberts, O. V. Rogachevskiy, J. L. Romero, A. Rose, C. Roy, L. Ruan, R. Sahoo, S. Sakai, I. Sakrejda, T. Sakuma, S. Salur, J. Sandweiss, E. Sangaline, J. Schambach, R. P. Scharenberg, N. Schmitz, T. R. Schuster, J. Seele, J. Seger, I. Selyuzhenkov, P. Seyboth, E. Shahaliev, M. Shao, M. Sharma, S. S. Shi, E. P. Sichtermann, F. Simon, R. N. Singaraju, M. J. Skoby, N. Smirnov, P. Sorensen, J. Sowinski, H. M. Spinka, B. Srivastava, T. D. S. Stanislaus, D. Staszak, J. R. Stevens, R. Stock, M. Strikhanov, B. Stringfellow, A. A. P. Suaide, M. C. Suarez, N. L. Subba, M. Sumbera, X. M. Sun, Y. Sun, Z. Sun, B. Surrow, D. N. Svirida, T. J. M. Symons, A. Szanto de Toledo, J. Takahashi, A. H. Tang, Z. Tang, L. H. Tarini, T. Tarnowsky, D. Thein, J. H. Thomas, J. Tian, A. R. Timmins, S. Timoshenko, D. Tlusty, M. Tokarev, T. A. Trainor, V. N. Tram, S. Trentalange, R. E. Tribble, O. D. Tsai, J. Ulery, T. Ullrich, D. G. Underwood, G. Van Buren, M. van Leeuwen, G. van Nieuwenhuizen, J. A. Vanfossen, R. Varma, G. M. S. Vasconcelos, A. N. Vasiliev, F. Videbaek, Y. P. Viyogi, S. Vokal, S. A. Voloshin, M. Wada, M. Walker, F. Wang, G. Wang, H. Wang, J. S. Wang, Q. Wang, X. L. Wang, Y. Wang, G. Webb, J. C. Webb, G. D. Westfall, C. Whitten, H. Wieman, S. W. Wissink, R. Witt, Y. F. Wu, W. Xie, H. Xu, N. Xu, Q. H. Xu, W. Xu, Y. Xu, Z. Xu, L. Xue, Y. Yang, P. Yepes, K. Yip, I.-K. Yoo, Q. Yue, M. Zawisza, H. Zbroszczyk, W. Zhan, J. B. Zhang, S. Zhang, W. M. Zhang, X. P. Zhang, Y. Zhang, Z. P. Zhang, J. Zhao, C. Zhong, J. Zhou, W. Zhou, X. Zhu, Y. H. Zhu, R. Zoulkarneev, and Y. Zoulkarneeva
Subjects: Physics, Nuclear and High Energy Physics, Meson, 010308 nuclear & particles physics, Hadron, Elliptic flow, Elementary particle, Fermion, 01 natural sciences, Nuclear physics, Particle decay, 0103 physical sciences, High Energy Physics::Experiment, Rapidity, Nuclear Experiment, 010306 general physics, Relativistic Heavy Ion Collider
Abstract: We report on K*(0) production at midrapidity in Au + Au and Cu + Cu collisions at root s(NN) = 62.4 and 200 GeV collected by the Solenoid Tracker at the Relativistic Heavy Ion Collider detector. The K*(0) is reconstructed via the hadronic decays K*(0) -> K+pi(-) and (K*(0)) over bar -> K+pi(-). Transverse momentum, p(T), spectra are measured over a range of p(T) extending from 0.2 GeV/c up to 5 GeV/c. The center-of-mass energy and system size dependence of the rapidity density, dN/dy, and the average transverse momentum, , are presented. The measured N(K*(0))/N(K) and N(phi)/N(K*(0)) ratios favor the dominance of rescattering of decay daughters of K*(0) over the hadronic regeneration for the K*(0) production. In the intermediate p(T) region (2.0 < p(T) < 4.0 GeV/c), the elliptic flow parameter, v(2), and the nuclear modification factor, R-CP, agree with the expectations from the quark coalescence model of particle production.
Published: 2011

33. Pion femtoscopy inp + pcollisions ats=200GeV

Author: M. M. Aggarwal, Z. Ahammed, A. V. Alakhverdyants, I. Alekseev, J. Alford, B. D. Anderson, D. Arkhipkin, G. S. Averichev, J. Balewski, L. S. Barnby, S. Baumgart, D. R. Beavis, R. Bellwied, M. J. Betancourt, R. R. Betts, A. Bhasin, A. K. Bhati, H. Bichsel, J. Bielcik, J. Bielcikova, B. Biritz, L. C. Bland, B. E. Bonner, J. Bouchet, E. Braidot, A. V. Brandin, A. Bridgeman, E. Bruna, S. Bueltmann, I. Bunzarov, T. P. Burton, X. Z. Cai, H. Caines, M. Calderón de la Barca Sánchez, O. Catu, D. Cebra, R. Cendejas, M. C. Cervantes, Z. Chajecki, P. Chaloupka, S. Chattopadhyay, H. F. Chen, J. H. Chen, J. Y. Chen, J. Cheng, M. Cherney, A. Chikanian, K. E. Choi, W. Christie, P. Chung, R. F. Clarke, M. J. M. Codrington, R. Corliss, J. G. Cramer, H. J. Crawford, D. Das, S. Dash, A. Davila Leyva, L. C. De Silva, R. R. Debbe, T. G. Dedovich, A. A. Derevschikov, R. Derradi de Souza, L. Didenko, P. Djawotho, S. M. Dogra, X. Dong, J. L. Drachenberg, J. E. Draper, J. C. Dunlop, M. R. Dutta Mazumdar, L. G. Efimov, E. Elhalhuli, M. Elnimr, J. Engelage, G. Eppley, B. Erazmus, M. Estienne, L. Eun, O. Evdokimov, P. Fachini, R. Fatemi, J. Fedorisin, R. G. Fersch, P. Filip, E. Finch, V. Fine, Y. Fisyak, C. A. Gagliardi, D. R. Gangadharan, M. S. Ganti, E. J. Garcia-Solis, A. Geromitsos, F. Geurts, V. Ghazikhanian, P. Ghosh, Y. N. Gorbunov, A. Gordon, O. Grebenyuk, D. Grosnick, S. M. Guertin, A. Gupta, N. Gupta, W. Guryn, B. Haag, A. Hamed, L-X. Han, J. W. Harris, J. P. Hays-Wehle, M. Heinz, S. Heppelmann, A. Hirsch, E. Hjort, A. M. Hoffman, G. W. Hoffmann, D. J. Hofman, B. Huang, H. Z. Huang, T. J. Humanic, L. Huo, G. Igo, P. Jacobs, W. W. Jacobs, C. Jena, F. Jin, C. L. Jones, P. G. Jones, J. Joseph, E. G. Judd, S. Kabana, K. Kajimoto, K. Kang, J. Kapitan, K. Kauder, D. Keane, A. Kechechyan, D. Kettler, D. P. Kikola, J. Kiryluk, A. Kisiel, S. R. Klein, A. G. Knospe, A. Kocoloski, D. D. Koetke, T. Kollegger, J. Konzer, I. Koralt, L. Koroleva, W. Korsch, L. Kotchenda, V. Kouchpil, P. Kravtsov, K. Krueger, M. Krus, L. Kumar, P. Kurnadi, M. A. C. Lamont, J. M. Landgraf, S. LaPointe, J. Lauret, A. Lebedev, R. Lednicky, C-H. Lee, J. H. Lee, W. Leight, M. J. LeVine, C. Li, L. Li, N. Li, W. Li, X. Li, Y. Li, Z. M. Li, G. Lin, S. J. Lindenbaum, M. A. Lisa, F. Liu, H. Liu, J. Liu, T. Ljubicic, W. J. Llope, R. S. Longacre, W. A. Love, Y. Lu, E. V. Lukashov, X. Luo, G. L. Ma, Y. G. Ma, D. P. Mahapatra, R. Majka, O. I. Mall, L. K. Mangotra, R. Manweiler, S. Margetis, C. Markert, H. Masui, H. S. Matis, Yu. A. Matulenko, D. McDonald, T. S. McShane, A. Meschanin, R. Milner, N. G. Minaev, S. Mioduszewski, A. Mischke, M. K. Mitrovski, B. Mohanty, M. M. Mondal, B. Morozov, D. A. Morozov, M. G. Munhoz, B. K. Nandi, C. Nattrass, T. K. Nayak, J. M. Nelson, P. K. Netrakanti, M. J. Ng, L. V. Nogach, S. B. Nurushev, G. Odyniec, A. Ogawa, V. Okorokov, E. W. Oldag, D. Olson, M. Pachr, B. S. Page, S. K. Pal, Y. Pandit, Y. Panebratsev, T. Pawlak, T. Peitzmann, V. Perevoztchikov, C. Perkins, W. Peryt, S. C. Phatak, P. Pile, M. Planinic, M. A. Ploskon, J. Pluta, D. Plyku, N. Poljak, A. M. Poskanzer, B. V. K. S. Potukuchi, C. B. Powell, D. Prindle, C. Pruneau, N. K. Pruthi, P. R. Pujahari, J. Putschke, H. Qiu, R. Raniwala, S. Raniwala, R. L. Ray, R. Redwine, R. Reed, H. G. Ritter, J. B. Roberts, O. V. Rogachevskiy, J. L. Romero, A. Rose, C. Roy, L. Ruan, R. Sahoo, S. Sakai, I. Sakrejda, T. Sakuma, S. Salur, J. Sandweiss, E. Sangaline, J. Schambach, R. P. Scharenberg, N. Schmitz, T. R. Schuster, J. Seele, J. Seger, I. Selyuzhenkov, P. Seyboth, E. Shahaliev, M. Shao, M. Sharma, S. S. Shi, E. P. Sichtermann, F. Simon, R. N. Singaraju, M. J. Skoby, N. Smirnov, P. Sorensen, J. Sowinski, H. M. Spinka, B. Srivastava, T. D. S. Stanislaus, D. Staszak, J. R. Stevens, R. Stock, M. Strikhanov, B. Stringfellow, A. A. P. Suaide, M. C. Suarez, N. L. Subba, M. Sumbera, X. M. Sun, Y. Sun, Z. Sun, B. Surrow, D. N. Svirida, T. J. M. Symons, A. Szanto de Toledo, J. Takahashi, A. H. Tang, Z. Tang, L. H. Tarini, T. Tarnowsky, D. Thein, J. H. Thomas, J. Tian, A. R. Timmins, S. Timoshenko, D. Tlusty, M. Tokarev, T. A. Trainor, V. N. Tram, S. Trentalange, R. E. Tribble, O. D. Tsai, J. Ulery, T. Ullrich, D. G. Underwood, G. Van Buren, M. van Leeuwen, G. van Nieuwenhuizen, J. A. Vanfossen, R. Varma, G. M. S. Vasconcelos, A. N. Vasiliev, F. Videbaek, Y. P. Viyogi, S. Vokal, S. A. Voloshin, M. Wada, M. Walker, F. Wang, G. Wang, H. Wang, J. S. Wang, Q. Wang, X. L. Wang, Y. Wang, G. Webb, J. C. Webb, G. D. Westfall, C. Whitten, H. Wieman, S. W. Wissink, R. Witt, Y. F. Wu, W. Xie, H. Xu, N. Xu, Q. H. Xu, W. Xu, Y. Xu, Z. Xu, L. Xue, Y. Yang, P. Yepes, K. Yip, I-K. Yoo, Q. Yue, M. Zawisza, H. Zbroszczyk, W. Zhan, J. B. Zhang, S. Zhang, W. M. Zhang, X. P. Zhang, Y. Zhang, Z. P. Zhang, J. Zhao, C. Zhong, J. Zhou, W. Zhou, X. Zhu, Y. H. Zhu, R. Zoulkarneev, and Y. Zoulkarneeva
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Meson, 010308 nuclear & particles physics, Nuclear Theory, Hadron, Elementary particle, Context (language use), Bose–Einstein correlations, 01 natural sciences, Nuclear physics, Pion, 0103 physical sciences, Quark–gluon plasma, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Relativistic Heavy Ion Collider
Abstract: The STAR Collaboration at the BNL Relativistic Heavy Ion Collider has measured two-pion correlation functions from p + p collisions at root s = 200 GeV. Spatial scales are extracted via a femtoscopic analysis of the correlations, though this analysis is complicated by the presence of strong nonfemtoscopic effects. Our results are put into the context of the world data set of femtoscopy in hadron-hadron collisions. We present the first direct comparison of femtoscopy in p + p and heavy ion collisions, under identical analysis and detector conditions.
Published: 2011

34. Experimental studies of di-jet survival and surface emission bias inAu+Aucollisions via angular correlations with respect to back-to-back leading hadrons

Author: H. Agakishiev, M. M. Aggarwal, Z. Ahammed, A. V. Alakhverdyants, I. Alekseev, J. Alford, B. D. Anderson, C. D. Anson, D. Arkhipkin, G. S. Averichev, J. Balewski, D. R. Beavis, N. K. Behera, R. Bellwied, M. J. Betancourt, R. R. Betts, A. Bhasin, A. K. Bhati, H. Bichsel, J. Bielcik, J. Bielcikova, B. Biritz, L. C. Bland, I. G. Bordyuzhin, W. Borowski, J. Bouchet, E. Braidot, A. V. Brandin, A. Bridgeman, S. G. Brovko, E. Bruna, S. Bueltmann, I. Bunzarov, T. P. Burton, X. Z. Cai, H. Caines, M. Calderón de la Barca Sánchez, D. Cebra, R. Cendejas, M. C. Cervantes, Z. Chajecki, P. Chaloupka, S. Chattopadhyay, H. F. Chen, J. H. Chen, J. Y. Chen, L. Chen, J. Cheng, M. Cherney, A. Chikanian, K. E. Choi, W. Christie, P. Chung, M. J. M. Codrington, R. Corliss, J. G. Cramer, H. J. Crawford, S. Dash, A. Davila Leyva, L. C. De Silva, R. R. Debbe, T. G. Dedovich, A. A. Derevschikov, R. Derradi de Souza, L. Didenko, P. Djawotho, S. M. Dogra, X. Dong, J. L. Drachenberg, J. E. Draper, J. C. Dunlop, L. G. Efimov, M. Elnimr, J. Engelage, G. Eppley, M. Estienne, L. Eun, O. Evdokimov, R. Fatemi, J. Fedorisin, R. G. Fersch, P. Filip, E. Finch, V. Fine, Y. Fisyak, C. A. Gagliardi, D. R. Gangadharan, A. Geromitsos, F. Geurts, P. Ghosh, Y. N. Gorbunov, A. Gordon, O. G. Grebenyuk, D. Grosnick, S. M. Guertin, A. Gupta, W. Guryn, B. Haag, O. Hajkova, A. Hamed, L-X. Han, J. W. Harris, J. P. Hays-Wehle, M. Heinz, S. Heppelmann, A. Hirsch, E. Hjort, G. W. Hoffmann, D. J. Hofman, B. Huang, H. Z. Huang, T. J. Humanic, L. Huo, G. Igo, P. Jacobs, W. W. Jacobs, C. Jena, F. Jin, J. Joseph, E. G. Judd, S. Kabana, K. Kang, J. Kapitan, K. Kauder, H. W. Ke, D. Keane, A. Kechechyan, D. Kettler, D. P. Kikola, J. Kiryluk, A. Kisiel, V. Kizka, S. R. Klein, A. G. Knospe, D. D. Koetke, T. Kollegger, J. Konzer, I. Koralt, L. Koroleva, W. Korsch, L. Kotchenda, V. Kouchpil, P. Kravtsov, K. Krueger, M. Krus, L. Kumar, P. Kurnadi, M. A. C. Lamont, J. M. Landgraf, S. LaPointe, J. Lauret, A. Lebedev, R. Lednicky, J. H. Lee, W. Leight, M. J. LeVine, C. Li, L. Li, N. Li, W. Li, X. Li, Y. Li, Z. M. Li, M. A. Lisa, F. Liu, H. Liu, J. Liu, T. Ljubicic, W. J. Llope, R. S. Longacre, W. A. Love, Y. Lu, E. V. Lukashov, X. Luo, G. L. Ma, Y. G. Ma, D. P. Mahapatra, R. Majka, O. I. Mall, L. K. Mangotra, R. Manweiler, S. Margetis, C. Markert, H. Masui, H. S. Matis, Yu. A. Matulenko, D. McDonald, T. S. McShane, A. Meschanin, R. Milner, N. G. Minaev, S. Mioduszewski, A. Mischke, M. K. Mitrovski, Y. Mohammed, B. Mohanty, M. M. Mondal, B. Morozov, D. A. Morozov, M. G. Munhoz, M. K. Mustafa, M. Naglis, B. K. Nandi, T. K. Nayak, P. K. Netrakanti, L. V. Nogach, S. B. Nurushev, G. Odyniec, A. Ogawa, K. Oh, A. Ohlson, V. Okorokov, E. W. Oldag, D. Olson, M. Pachr, B. S. Page, S. K. Pal, Y. Pandit, Y. Panebratsev, T. Pawlak, H. Pei, T. Peitzmann, C. Perkins, W. Peryt, S. C. Phatak, P. Pile, M. Planinic, M. A. Ploskon, J. Pluta, D. Plyku, N. Poljak, A. M. Poskanzer, B. V. K. S. Potukuchi, C. B. Powell, D. Prindle, C. Pruneau, N. K. Pruthi, P. R. Pujahari, J. Putschke, H. Qiu, R. Raniwala, S. Raniwala, R. L. Ray, R. Redwine, R. Reed, H. G. Ritter, J. B. Roberts, O. V. Rogachevskiy, J. L. Romero, A. Rose, L. Ruan, J. Rusnak, N. R. Sahoo, S. Sakai, I. Sakrejda, S. Salur, J. Sandweiss, E. Sangaline, A. Sarkar, J. Schambach, R. P. Scharenberg, A. M. Schmah, N. Schmitz, T. R. Schuster, J. Seele, J. Seger, I. Selyuzhenkov, P. Seyboth, E. Shahaliev, M. Shao, M. Sharma, S. S. Shi, Q. Y. Shou, E. P. Sichtermann, F. Simon, R. N. Singaraju, M. J. Skoby, N. Smirnov, P. Sorensen, H. M. Spinka, B. Srivastava, T. D. S. Stanislaus, D. Staszak, S. G. Steadman, J. R. Stevens, R. Stock, M. Strikhanov, B. Stringfellow, A. A. P. Suaide, M. C. Suarez, N. L. Subba, M. Sumbera, X. M. Sun, Y. Sun, Z. Sun, B. Surrow, D. N. Svirida, T. J. M. Symons, A. Szanto de Toledo, J. Takahashi, A. H. Tang, Z. Tang, L. H. Tarini, T. Tarnowsky, D. Thein, J. H. Thomas, J. Tian, A. R. Timmins, D. Tlusty, M. Tokarev, T. A. Trainor, V. N. Tram, S. Trentalange, R. E. Tribble, P. Tribedy, O. D. Tsai, T. Ullrich, D. G. Underwood, G. Van Buren, G. van Nieuwenhuizen, J. A. Vanfossen, R. Varma, G. M. S. Vasconcelos, A. N. Vasiliev, F. Videbæk, Y. P. Viyogi, S. Vokal, S. A. Voloshin, M. Wada, M. Walker, F. Wang, G. Wang, H. Wang, J. S. Wang, Q. Wang, X. L. Wang, Y. Wang, G. Webb, J. C. Webb, G. D. Westfall, C. Whitten, H. Wieman, S. W. Wissink, R. Witt, W. Witzke, Y. F. Wu, Z. Xiao, W. Xie, H. Xu, N. Xu, Q. H. Xu, W. Xu, Y. Xu, Z. Xu, L. Xue, Y. Yang, P. Yepes, K. Yip, I-K. Yoo, M. Zawisza, H. Zbroszczyk, W. Zhan, J. B. Zhang, S. Zhang, W. M. Zhang, X. P. Zhang, Y. Zhang, Z. P. Zhang, J. Zhao, C. Zhong, W. Zhou, X. Zhu, Y. H. Zhu, R. Zoulkarneev, and Y. Zoulkarneeva
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Hadron, Particle accelerator, Elementary particle, Jet (particle physics), 01 natural sciences, Spectral line, law.invention, Nuclear physics, Deuterium, law, Pseudorapidity, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Relativistic Heavy Ion Collider
Abstract: We report first results from an analysis based on a new multi-hadron correlation technique, exploring jet-medium interactions and di-jet surface emission bias at the BNL Relativistic Heavy Ion Collider (RHIC). Pairs of back-to-back high-transverse-momentum hadrons are used for triggers to study associated hadron distributions. In contrast with two-and three-particle correlations with a single trigger with similar kinematic selections, the associated hadron distribution of both trigger sides reveals no modification in either relative pseudorapidity Delta eta or relative azimuthal angle Delta phi from d + Au to central Au + Au collisions. We determine associated hadron yields and spectra as well as production rates for such correlated back-to-back triggers to gain additional insights on medium properties.
Published: 2011

35. Strange and multistrange particle production in Au + Au collisions atsNN=62.4 GeV

Author: M. M. Aggarwal, Z. Ahammed, A. V. Alakhverdyants, I. Alekseev, J. Alford, B. D. Anderson, C. D. Anson, D. Arkhipkin, G. S. Averichev, J. Balewski, D. R. Beavis, R. Bellwied, M. J. Betancourt, R. R. Betts, A. Bhasin, A. K. Bhati, H. Bichsel, J. Bielcik, J. Bielcikova, B. Biritz, L. C. Bland, W. Borowski, J. Bouchet, E. Braidot, A. V. Brandin, A. Bridgeman, S. G. Brovko, E. Bruna, S. Bueltmann, I. Bunzarov, T. P. Burton, X. Z. Cai, H. Caines, M. Calderón de la Barca Sánchez, D. Cebra, R. Cendejas, M. C. Cervantes, Z. Chajecki, P. Chaloupka, S. Chattopadhyay, H. F. Chen, J. H. Chen, J. Y. Chen, J. Cheng, M. Cherney, A. Chikanian, K. E. Choi, W. Christie, P. Chung, M. J. M. Codrington, R. Corliss, J. G. Cramer, H. J. Crawford, S. Dash, A. Davila Leyva, L. C. De Silva, R. R. Debbe, T. G. Dedovich, A. A. Derevschikov, R. Derradi de Souza, L. Didenko, P. Djawotho, S. M. Dogra, X. Dong, J. L. Drachenberg, J. E. Draper, J. C. Dunlop, M. R. Dutta Mazumdar, L. G. Efimov, M. Elnimr, J. Engelage, G. Eppley, M. Estienne, L. Eun, O. Evdokimov, R. Fatemi, J. Fedorisin, R. G. Fersch, E. Finch, V. Fine, Y. Fisyak, C. A. Gagliardi, D. R. Gangadharan, A. Geromitsos, F. Geurts, P. Ghosh, Y. N. Gorbunov, A. Gordon, O. Grebenyuk, D. Grosnick, S. M. Guertin, A. Gupta, W. Guryn, B. Haag, O. Hajkova, A. Hamed, L-X. Han, J. W. Harris, J. P. Hays-Wehle, M. Heinz, S. Heppelmann, A. Hirsch, E. Hjort, G. W. Hoffmann, D. J. Hofman, B. Huang, H. Z. Huang, T. J. Humanic, L. Huo, G. Igo, P. Jacobs, W. W. Jacobs, C. Jena, F. Jin, J. Joseph, E. G. Judd, S. Kabana, K. Kang, J. Kapitan, K. Kauder, D. Keane, A. Kechechyan, D. Kettler, D. P. Kikola, J. Kiryluk, A. Kisiel, V. Kizka, S. R. Klein, A. G. Knospe, D. D. Koetke, T. Kollegger, J. Konzer, I. Koralt, L. Koroleva, W. Korsch, L. Kotchenda, V. Kouchpil, P. Kravtsov, K. Krueger, M. Krus, L. Kumar, P. Kurnadi, M. A. C. Lamont, J. M. Landgraf, S. LaPointe, J. Lauret, A. Lebedev, R. Lednicky, J. H. Lee, W. Leight, M. J. LeVine, C. Li, L. Li, N. Li, W. Li, X. Li, Y. Li, Z. M. Li, M. A. Lisa, F. Liu, H. Liu, J. Liu, T. Ljubicic, W. J. Llope, R. S. Longacre, W. A. Love, Y. Lu, E. V. Lukashov, X. Luo, G. L. Ma, Y. G. Ma, D. P. Mahapatra, R. Majka, O. I. Mall, L. K. Mangotra, R. Manweiler, S. Margetis, C. Markert, H. Masui, H. S. Matis, Yu. A. Matulenko, D. McDonald, T. S. McShane, A. Meschanin, R. Milner, N. G. Minaev, S. Mioduszewski, A. Mischke, M. K. Mitrovski, B. Mohanty, M. M. Mondal, B. Morozov, D. A. Morozov, M. G. Munhoz, M. Naglis, B. K. Nandi, T. K. Nayak, P. K. Netrakanti, M. J. Ng, L. V. Nogach, S. B. Nurushev, G. Odyniec, A. Ogawa, K. Oh, A. Ohlson, V. Okorokov, E. W. Oldag, D. Olson, M. Pachr, B. S. Page, S. K. Pal, Y. Pandit, Y. Panebratsev, T. Pawlak, H. Pei, T. Peitzmann, C. Perkins, W. Peryt, S. C. Phatak, P. Pile, M. Planinic, M. A. Ploskon, J. Pluta, D. Plyku, N. Poljak, A. M. Poskanzer, B. V. K. S. Potukuchi, C. B. Powell, D. Prindle, C. Pruneau, N. K. Pruthi, P. R. Pujahari, J. Putschke, H. Qiu, R. Raniwala, S. Raniwala, R. L. Ray, R. Redwine, R. Reed, H. G. Ritter, J. B. Roberts, O. V. Rogachevskiy, J. L. Romero, A. Rose, L. Ruan, J. Rusnak, S. Sakai, I. Sakrejda, T. Sakuma, S. Salur, J. Sandweiss, E. Sangaline, J. Schambach, R. P. Scharenberg, A. M. Schmah, N. Schmitz, T. R. Schuster, J. Seele, J. Seger, I. Selyuzhenkov, P. Seyboth, E. Shahaliev, M. Shao, M. Sharma, S. S. Shi, E. P. Sichtermann, F. Simon, R. N. Singaraju, M. J. Skoby, N. Smirnov, P. Sorensen, J. Speltz, H. M. Spinka, B. Srivastava, T. D. S. Stanislaus, D. Staszak, S. G. Steadman, J. R. Stevens, R. Stock, M. Strikhanov, B. Stringfellow, A. A. P. Suaide, M. C. Suarez, N. L. Subba, M. Sumbera, X. M. Sun, Y. Sun, Z. Sun, B. Surrow, D. N. Svirida, T. J. M. Symons, A. Szanto de Toledo, J. Takahashi, A. H. Tang, Z. Tang, L. H. Tarini, T. Tarnowsky, D. Thein, J. H. Thomas, J. Tian, A. R. Timmins, D. Tlusty, M. Tokarev, T. A. Trainor, V. N. Tram, S. Trentalange, R. E. Tribble, P. Tribedy, O. D. Tsai, T. Ullrich, D. G. Underwood, G. Van Buren, G. van Nieuwenhuizen, J. A. Vanfossen, R. Varma, G. M. S. Vasconcelos, A. N. Vasiliev, F. Videbæk, Y. P. Viyogi, S. Vokal, S. A. Voloshin, M. Wada, M. Walker, F. Wang, G. Wang, H. Wang, J. S. Wang, Q. Wang, X. L. Wang, Y. Wang, G. Webb, J. C. Webb, G. D. Westfall, C. Whitten, H. Wieman, S. W. Wissink, R. Witt, W. Witzke, Y. F. Wu, W. Xie, H. Xu, N. Xu, Q. H. Xu, W. Xu, Y. Xu, Z. Xu, L. Xue, Y. Yang, P. Yepes, K. Yip, I-K. Yoo, Q. Yue, M. Zawisza, H. Zbroszczyk, W. Zhan, J. B. Zhang, S. Zhang, W. M. Zhang, X. P. Zhang, Y. Zhang, Z. P. Zhang, J. Zhao, C. Zhong, W. Zhou, X. Zhu, Y. H. Zhu, R. Zoulkarneev, and Y. Zoulkarneeva
Subjects: Physics, Nuclear and High Energy Physics, Meson, 010308 nuclear & particles physics, Nuclear Theory, Hadron, Elementary particle, Strangeness, 01 natural sciences, 7. Clean energy, Omega, Baryon, Nuclear physics, Antimatter, 0103 physical sciences, Nuclear Experiment, 010306 general physics, Relativistic Heavy Ion Collider
Abstract: We present results on strange and multistrange particle production in Au + Au collisions at root s(NN) = 62.4 GeV as measured with the STAR detector at RHIC. Midrapidity transverse momentum spectra and integrated yields of K-S(0), Lambda, Xi, and Omega and their antiparticles are presented for different centrality classes. The particle yields and ratios follow a smooth energy dependence. Chemical freeze-out parameters, temperature, baryon chemical potential, and strangeness saturation factor obtained from the particle yields are presented. Intermediate transverse momentum (p(T)) phenomena are discussed based on the ratio of the measured baryon-to-meson spectra and nuclear modification factor. The centrality dependence of various measurements presented show a similar behavior as seen in Au + Au collisions at root s(NN) = 200 GeV.
Published: 2011

36. Scaling properties at freeze-out in relativistic heavy-ion collisions

Author: M. M. Aggarwal, Z. Ahammed, A. V. Alakhverdyants, I. Alekseev, J. Alford, B. D. Anderson, C. D. Anson, D. Arkhipkin, G. S. Averichev, J. Balewski, L. S. Barnby, D. R. Beavis, R. Bellwied, M. J. Betancourt, R. R. Betts, A. Bhasin, A. K. Bhati, H. Bichsel, J. Bielcik, J. Bielcikova, B. Biritz, L. C. Bland, W. Borowski, J. Bouchet, E. Braidot, A. V. Brandin, A. Bridgeman, E. Bruna, S. Bueltmann, I. Bunzarov, T. P. Burton, X. Z. Cai, H. Caines, M. Calderón de la Barca Sánchez, D. Cebra, R. Cendejas, M. C. Cervantes, Z. Chajecki, P. Chaloupka, S. Chattopadhyay, H. F. Chen, J. H. Chen, J. Y. Chen, J. Cheng, M. Cherney, A. Chikanian, K. E. Choi, W. Christie, P. Chung, M. J. M. Codrington, R. Corliss, J. G. Cramer, H. J. Crawford, S. Dash, A. Davila Leyva, L. C. De Silva, R. R. Debbe, T. G. Dedovich, A. A. Derevschikov, R. Derradi de Souza, L. Didenko, P. Djawotho, S. M. Dogra, X. Dong, J. L. Drachenberg, J. E. Draper, J. C. Dunlop, M. R. Dutta Mazumdar, L. G. Efimov, M. Elnimr, J. Engelage, G. Eppley, B. Erazmus, M. Estienne, L. Eun, O. Evdokimov, R. Fatemi, J. Fedorisin, R. G. Fersch, E. Finch, V. Fine, Y. Fisyak, C. A. Gagliardi, D. R. Gangadharan, M. S. Ganti, A. Geromitsos, F. Geurts, P. Ghosh, Y. N. Gorbunov, A. Gordon, O. Grebenyuk, D. Grosnick, S. M. Guertin, A. Gupta, W. Guryn, B. Haag, A. Hamed, L-X. Han, J. W. Harris, J. P. Hays-Wehle, M. Heinz, S. Heppelmann, A. Hirsch, E. Hjort, G. W. Hoffmann, D. J. Hofman, R. S. Hollis, B. Huang, H. Z. Huang, T. J. Humanic, L. Huo, G. Igo, A. Iordanova, P. Jacobs, W. W. Jacobs, C. Jena, F. Jin, J. Joseph, E. G. Judd, S. Kabana, K. Kang, J. Kapitan, K. Kauder, D. Keane, A. Kechechyan, D. Kettler, D. P. Kikola, J. Kiryluk, A. Kisiel, V. Kizka, S. R. Klein, A. G. Knospe, A. Kocoloski, D. D. Koetke, T. Kollegger, J. Konzer, I. Koralt, L. Koroleva, W. Korsch, L. Kotchenda, V. Kouchpil, P. Kravtsov, K. Krueger, M. Krus, L. Kumar, P. Kurnadi, M. A. C. Lamont, J. M. Landgraf, S. LaPointe, J. Lauret, A. Lebedev, R. Lednicky, C-H. Lee, J. H. Lee, W. Leight, M. J. LeVine, C. Li, L. Li, N. Li, W. Li, X. Li, Y. Li, Z. M. Li, M. A. Lisa, F. Liu, H. Liu, J. Liu, T. Ljubicic, W. J. Llope, R. S. Longacre, W. A. Love, Y. Lu, E. V. Lukashov, X. Luo, G. L. Ma, Y. G. Ma, D. P. Mahapatra, R. Majka, O. I. Mall, L. K. Mangotra, R. Manweiler, S. Margetis, C. Markert, H. Masui, H. S. Matis, Yu. A. Matulenko, D. McDonald, T. S. McShane, A. Meschanin, R. Milner, N. G. Minaev, S. Mioduszewski, M. K. Mitrovski, B. Mohanty, M. M. Mondal, B. Morozov, D. A. Morozov, M. G. Munhoz, M. Naglis, B. K. Nandi, T. K. Nayak, P. K. Netrakanti, M. J. Ng, L. V. Nogach, S. B. Nurushev, G. Odyniec, A. Ogawa, A. Ohlson, V. Okorokov, E. W. Oldag, D. Olson, M. Pachr, B. S. Page, S. K. Pal, Y. Pandit, Y. Panebratsev, T. Pawlak, T. Peitzmann, C. Perkins, W. Peryt, S. C. Phatak, P. Pile, M. Planinic, M. A. Ploskon, J. Pluta, D. Plyku, N. Poljak, A. M. Poskanzer, B. V. K. S. Potukuchi, C. B. Powell, D. Prindle, C. Pruneau, N. K. Pruthi, P. R. Pujahari, J. Putschke, H. Qiu, R. Raniwala, S. Raniwala, R. L. Ray, R. Redwine, R. Reed, H. G. Ritter, J. B. Roberts, O. V. Rogachevskiy, J. L. Romero, A. Rose, L. Ruan, S. Sakai, I. Sakrejda, T. Sakuma, S. Salur, J. Sandweiss, E. Sangaline, J. Schambach, R. P. Scharenberg, A. M. Schmah, N. Schmitz, T. R. Schuster, J. Seele, J. Seger, I. Selyuzhenkov, P. Seyboth, E. Shahaliev, M. Shao, M. Sharma, S. S. Shi, E. P. Sichtermann, F. Simon, R. N. Singaraju, M. J. Skoby, N. Smirnov, P. Sorensen, H. M. Spinka, B. Srivastava, T. D. S. Stanislaus, D. Staszak, J. R. Stevens, R. Stock, M. Strikhanov, B. Stringfellow, A. A. P. Suaide, M. C. Suarez, N. L. Subba, M. Sumbera, X. M. Sun, Y. Sun, Z. Sun, B. Surrow, D. N. Svirida, T. J. M. Symons, A. Szanto de Toledo, J. Takahashi, A. H. Tang, Z. Tang, L. H. Tarini, T. Tarnowsky, D. Thein, J. H. Thomas, J. Tian, A. R. Timmins, S. Timoshenko, D. Tlusty, M. Tokarev, V. N. Tram, S. Trentalange, R. E. Tribble, O. D. Tsai, T. Ullrich, D. G. Underwood, G. Van Buren, M. van Leeuwen, G. van Nieuwenhuizen, J. A. Vanfossen, R. Varma, G. M. S. Vasconcelos, A. N. Vasiliev, F. Videbæk, Y. P. Viyogi, S. Vokal, S. A. Voloshin, M. Wada, M. Walker, F. Wang, G. Wang, H. Wang, J. S. Wang, Q. Wang, X. L. Wang, Y. Wang, G. Webb, J. C. Webb, G. D. Westfall, C. Whitten Jr., H. Wieman, S. W. Wissink, R. Witt, Y. F. Wu, W. Xie, H. Xu, N. Xu, Q. H. Xu, W. Xu, Y. Xu, Z. Xu, L. Xue, Y. Yang, P. Yepes, K. Yip, I-K. Yoo, Q. Yue, M. Zawisza, H. Zbroszczyk, W. Zhan, J. B. Zhang, S. Zhang, W. M. Zhang, X. P. Zhang, Y. Zhang, Z. P. Zhang, J. Zhao, C. Zhong, W. Zhou, X. Zhu, Y. H. Zhu, R. Zoulkarneev, Y. Zoulkarneeva, Laboratoire SUBATECH Nantes (SUBATECH), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Nantes (UN)-Mines Nantes (Mines Nantes), and STAR
Subjects: Nuclear reaction, Nuclear and High Energy Physics, Meson, Hadron, Nuclear Theory, FOS: Physical sciences, Elementary particle, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 200GeV, 01 natural sciences, Nuclear physics, Pion, 0103 physical sciences, Nuclear Experiment (nucl-ex), Multiplicity (chemistry), 010306 general physics, Nuclear Experiment, Quantum chromodynamics, Physics, STAR, 010308 nuclear & particles physics, scaling, Charged particle, NATURAL SCIENCES. Physics, PRIRODNE ZNANOSTI. Fizika
Abstract: Identified charged pion, kaon, and proton spectra are used to explore the system size dependence of bulk freeze-out properties in Cu+Cu collisions at $\sqrt{s_{NN}}$=200 and 62.4 GeV. The data are studied with hydrodynamically-motivated Blast-wave and statistical model frameworks in order to characterize the freeze-out properties of the system. The dependence of freeze-out parameters on beam energy and collision centrality is discussed. Using the existing results from Au+Au and $pp$ collisions, the dependence of freeze-out parameters on the system size is also explored. This multi-dimensional systematic study furthers our understanding of the QCD phase diagram revealing the importance of the initial geometrical overlap of the colliding ions. The analysis of Cu+Cu collisions, which expands the system size dependence studies from Au+Au data with detailed measurements in the smaller system, shows that the bulk freeze-out properties of charged particles studied here scale with the total charged particle multiplicity at mid-rapidity, suggesting the relevance of initial state effects., submitted to Phys.Rev.C, 13 pages, 14 figures
Published: 2011

37. Measurement of the Bottom Quark Contribution to Nonphotonic Electron Production inp+pCollisions ats=200 GeV

Author: M. M. Aggarwal, Z. Ahammed, A. V. Alakhverdyants, I. Alekseev, J. Alford, B. D. Anderson, Daniel Anson, D. Arkhipkin, G. S. Averichev, J. Balewski, L. S. Barnby, S. Baumgart, D. R. Beavis, R. Bellwied, M. J. Betancourt, R. R. Betts, A. Bhasin, A. K. Bhati, H. Bichsel, J. Bielcik, J. Bielcikova, B. Biritz, L. C. Bland, B. E. Bonner, J. Bouchet, E. Braidot, A. V. Brandin, A. Bridgeman, E. Bruna, S. Bueltmann, I. Bunzarov, T. P. Burton, X. Z. Cai, H. Caines, M. Calderón de la Barca Sánchez, O. Catu, D. Cebra, R. Cendejas, M. C. Cervantes, Z. Chajecki, P. Chaloupka, S. Chattopadhyay, H. F. Chen, J. H. Chen, J. Y. Chen, J. Cheng, M. Cherney, A. Chikanian, K. E. Choi, W. Christie, P. Chung, R. F. Clarke, M. J. M. Codrington, R. Corliss, J. G. Cramer, H. J. Crawford, D. Das, S. Dash, A. Davila Leyva, L. C. De Silva, R. R. Debbe, T. G. Dedovich, A. A. Derevschikov, R. Derradi de Souza, L. Didenko, P. Djawotho, S. M. Dogra, X. Dong, J. L. Drachenberg, J. E. Draper, J. C. Dunlop, M. R. Dutta Mazumdar, L. G. Efimov, E. Elhalhuli, M. Elnimr, J. Engelage, G. Eppley, B. Erazmus, M. Estienne, L. Eun, O. Evdokimov, P. Fachini, R. Fatemi, J. Fedorisin, R. G. Fersch, P. Filip, E. Finch, V. Fine, Y. Fisyak, C. A. Gagliardi, D. R. Gangadharan, M. S. Ganti, E. J. Garcia-Solis, A. Geromitsos, F. Geurts, V. Ghazikhanian, P. Ghosh, Y. N. Gorbunov, A. Gordon, O. Grebenyuk, D. Grosnick, S. M. Guertin, A. Gupta, W. Guryn, B. Haag, A. Hamed, L-X. Han, J. W. Harris, J. P. Hays-Wehle, M. Heinz, S. Heppelmann, A. Hirsch, E. Hjort, A. M. Hoffman, G. W. Hoffmann, D. J. Hofman, B. Huang, H. Z. Huang, T. J. Humanic, L. Huo, G. Igo, P. Jacobs, W. W. Jacobs, C. Jena, F. Jin, C. L. Jones, P. G. Jones, J. Joseph, E. G. Judd, S. Kabana, K. Kajimoto, K. Kang, J. Kapitan, K. Kauder, D. Keane, A. Kechechyan, D. Kettler, D. P. Kikola, J. Kiryluk, A. Kisiel, V. Kizka, S. R. Klein, A. G. Knospe, A. Kocoloski, D. D. Koetke, T. Kollegger, J. Konzer, I. Koralt, L. Koroleva, W. Korsch, L. Kotchenda, V. Kouchpil, P. Kravtsov, K. Krueger, M. Krus, L. Kumar, P. Kurnadi, M. A. C. Lamont, J. M. Landgraf, S. LaPointe, J. Lauret, A. Lebedev, R. Lednicky, C-H. Lee, J. H. Lee, W. Leight, M. J. LeVine, C. Li, L. Li, N. Li, W. Li, X. Li, Y. Li, Z. M. Li, G. Lin, X. Y. Lin, S. J. Lindenbaum, M. A. Lisa, F. Liu, H. Liu, J. Liu, T. Ljubicic, W. J. Llope, R. S. Longacre, W. A. Love, Y. Lu, E. V. Lukashov, X. Luo, G. L. Ma, Y. G. Ma, D. P. Mahapatra, R. Majka, O. I. Mall, L. K. Mangotra, R. Manweiler, S. Margetis, C. Markert, H. Masui, H. S. Matis, Yu. A. Matulenko, D. McDonald, T. S. McShane, A. Meschanin, R. Milner, N. G. Minaev, S. Mioduszewski, A. Mischke, M. K. Mitrovski, B. Mohanty, M. M. Mondal, B. Morozov, D. A. Morozov, M. G. Munhoz, B. K. Nandi, C. Nattrass, T. K. Nayak, J. M. Nelson, P. K. Netrakanti, M. J. Ng, L. V. Nogach, S. B. Nurushev, G. Odyniec, A. Ogawa, V. Okorokov, E. W. Oldag, D. Olson, M. Pachr, B. S. Page, S. K. Pal, Y. Pandit, Y. Panebratsev, T. Pawlak, T. Peitzmann, V. Perevoztchikov, C. Perkins, W. Peryt, S. C. Phatak, P. Pile, M. Planinic, M. A. Ploskon, J. Pluta, D. Plyku, N. Poljak, A. M. Poskanzer, B. V. K. S. Potukuchi, C. B. Powell, D. Prindle, C. Pruneau, N. K. Pruthi, P. R. Pujahari, J. Putschke, H. Qiu, R. Raniwala, S. Raniwala, R. L. Ray, R. Redwine, R. Reed, H. G. Ritter, J. B. Roberts, O. V. Rogachevskiy, J. L. Romero, A. Rose, C. Roy, L. Ruan, R. Sahoo, S. Sakai, I. Sakrejda, T. Sakuma, S. Salur, J. Sandweiss, E. Sangaline, J. Schambach, R. P. Scharenberg, N. Schmitz, T. R. Schuster, J. Seele, J. Seger, I. Selyuzhenkov, P. Seyboth, E. Shahaliev, M. Shao, M. Sharma, S. S. Shi, E. P. Sichtermann, F. Simon, R. N. Singaraju, M. J. Skoby, N. Smirnov, P. Sorensen, J. Sowinski, H. M. Spinka, B. Srivastava, T. D. S. Stanislaus, D. Staszak, J. R. Stevens, R. Stock, M. Strikhanov, B. Stringfellow, A. A. P. Suaide, M. C. Suarez, N. L. Subba, M. Sumbera, X. M. Sun, Y. Sun, Z. Sun, B. Surrow, D. N. Svirida, T. J. M. Symons, A. Szanto de Toledo, J. Takahashi, A. H. Tang, Z. Tang, L. H. Tarini, T. Tarnowsky, D. Thein, J. H. Thomas, J. Tian, A. R. Timmins, S. Timoshenko, D. Tlusty, M. Tokarev, T. A. Trainor, V. N. Tram, S. Trentalange, R. E. Tribble, O. D. Tsai, J. Ulery, T. Ullrich, D. G. Underwood, G. Van Buren, M. van Leeuwen, G. van Nieuwenhuizen, J. A. Vanfossen, R. Varma, G. M. S. Vasconcelos, A. N. Vasiliev, F. Videbaek, Y. P. Viyogi, S. Vokal, S. A. Voloshin, M. Wada, M. Walker, F. Wang, G. Wang, H. Wang, J. S. Wang, Q. Wang, X. L. Wang, Y. Wang, G. Webb, J. C. Webb, G. D. Westfall, C. Whitten, H. Wieman, S. W. Wissink, R. Witt, Y. F. Wu, W. Xie, H. Xu, N. Xu, Q. H. Xu, W. Xu, Y. Xu, Z. Xu, L. Xue, Y. Yang, P. Yepes, K. Yip, I-K. Yoo, Q. Yue, M. Zawisza, H. Zbroszczyk, W. Zhan, J. B. Zhang, S. Zhang, W. M. Zhang, X. P. Zhang, Y. Zhang, Z. P. Zhang, J. Zhao, C. Zhong, J. Zhou, W. Zhou, X. Zhu, Y. H. Zhu, R. Zoulkarneev, and Y. Zoulkarneeva
Subjects: Physics, Quark, Semileptonic decay, Particle physics, Meson, 010308 nuclear & particles physics, High Energy Physics::Lattice, Nuclear Theory, High Energy Physics::Phenomenology, Hadron, Quark model, General Physics and Astronomy, 01 natural sciences, 7. Clean energy, Bottom quark, Nuclear physics, 0103 physical sciences, D meson, High Energy Physics::Experiment, B meson, Nuclear Experiment, 010306 general physics
Abstract: The contribution of B meson decays to nonphotonic electrons, which are mainly produced by the semileptonic decays of heavy-flavor mesons, in p + p collisions at root s = 200 GeV has been measured using azimuthal correlations between nonphotonic electrons and hadrons. The extracted B decay contribution is approximately 50% at a transverse momentum of p(T) >= 5 GeV/c. These measurements constrain the nuclear modification factor for electrons from B and D meson decays. The result indicates that B meson production in heavy ion collisions is also suppressed at high p(T).
Published: 2010

38. Balance functions fromAu+Au,d+Au, andp+pcollisions atsNN=200GeV

Author: M. M. Aggarwal, Z. Ahammed, A. V. Alakhverdyants, I. Alekseev, J. Alford, B. D. Anderson, D. Arkhipkin, G. S. Averichev, J. Balewski, L. S. Barnby, S. Baumgart, D. R. Beavis, R. Bellwied, M. J. Betancourt, R. R. Betts, A. Bhasin, A. K. Bhati, H. Bichsel, J. Bielcik, J. Bielcikova, B. Biritz, L. C. Bland, B. E. Bonner, J. Bouchet, E. Braidot, A. V. Brandin, A. Bridgeman, E. Bruna, S. Bueltmann, I. Bunzarov, T. P. Burton, X. Z. Cai, H. Caines, M. Calderón de la Barca Sánchez, O. Catu, D. Cebra, R. Cendejas, M. C. Cervantes, Z. Chajecki, P. Chaloupka, S. Chattopadhyay, H. F. Chen, J. H. Chen, J. Y. Chen, J. Cheng, M. Cherney, A. Chikanian, K. E. Choi, W. Christie, P. Chung, R. F. Clarke, M. J. M. Codrington, R. Corliss, J. G. Cramer, H. J. Crawford, D. Das, S. Dash, A. Davila Leyva, L. C. De Silva, R. R. Debbe, T. G. Dedovich, A. A. Derevschikov, R. Derradi de Souza, L. Didenko, P. Djawotho, S. M. Dogra, X. Dong, J. L. Drachenberg, J. E. Draper, J. C. Dunlop, M. R. Dutta Mazumdar, L. G. Efimov, E. Elhalhuli, M. Elnimr, J. Engelage, G. Eppley, B. Erazmus, M. Estienne, L. Eun, O. Evdokimov, P. Fachini, R. Fatemi, J. Fedorisin, R. G. Fersch, P. Filip, E. Finch, V. Fine, Y. Fisyak, C. A. Gagliardi, D. R. Gangadharan, M. S. Ganti, E. J. Garcia-Solis, A. Geromitsos, F. Geurts, V. Ghazikhanian, P. Ghosh, Y. N. Gorbunov, A. Gordon, O. Grebenyuk, D. Grosnick, S. M. Guertin, A. Gupta, N. Gupta, W. Guryn, B. Haag, A. Hamed, L-X. Han, J. W. Harris, J. P. Hays-Wehle, M. Heinz, S. Heppelmann, A. Hirsch, E. Hjort, A. M. Hoffman, G. W. Hoffmann, D. J. Hofman, B. Huang, H. Z. Huang, T. J. Humanic, L. Huo, G. Igo, P. Jacobs, W. W. Jacobs, C. Jena, F. Jin, C. L. Jones, P. G. Jones, J. Joseph, E. G. Judd, S. Kabana, K. Kajimoto, K. Kang, J. Kapitan, K. Kauder, D. Keane, A. Kechechyan, D. Kettler, D. P. Kikola, J. Kiryluk, A. Kisiel, S. R. Klein, A. G. Knospe, A. Kocoloski, D. D. Koetke, T. Kollegger, J. Konzer, I. Koralt, L. Koroleva, W. Korsch, L. Kotchenda, V. Kouchpil, P. Kravtsov, K. Krueger, M. Krus, L. Kumar, P. Kurnadi, M. A. C. Lamont, J. M. Landgraf, S. LaPointe, J. Lauret, A. Lebedev, R. Lednicky, C-H. Lee, J. H. Lee, W. Leight, M. J. LeVine, C. Li, L. Li, N. Li, W. Li, X. Li, Y. Li, Z. M. Li, G. Lin, S. J. Lindenbaum, M. A. Lisa, F. Liu, H. Liu, J. Liu, T. Ljubicic, W. J. Llope, R. S. Longacre, W. A. Love, Y. Lu, X. Luo, G. L. Ma, Y. G. Ma, D. P. Mahapatra, R. Majka, O. I. Mall, L. K. Mangotra, R. Manweiler, S. Margetis, C. Markert, H. Masui, H. S. Matis, Yu. A. Matulenko, D. McDonald, T. S. McShane, A. Meschanin, R. Milner, N. G. Minaev, S. Mioduszewski, A. Mischke, M. K. Mitrovski, B. Mohanty, M. M. Mondal, B. Morozov, D. A. Morozov, M. G. Munhoz, B. K. Nandi, C. Nattrass, T. K. Nayak, J. M. Nelson, P. K. Netrakanti, M. J. Ng, L. V. Nogach, S. B. Nurushev, G. Odyniec, A. Ogawa, V. Okorokov, E. W. Oldag, D. Olson, M. Pachr, B. S. Page, S. K. Pal, Y. Pandit, Y. Panebratsev, T. Pawlak, T. Peitzmann, V. Perevoztchikov, C. Perkins, W. Peryt, S. C. Phatak, P. Pile, M. Planinic, M. A. Ploskon, J. Pluta, D. Plyku, N. Poljak, A. M. Poskanzer, B. V. K. S. Potukuchi, C. B. Powell, D. Prindle, C. Pruneau, N. K. Pruthi, P. R. Pujahari, J. Putschke, R. Raniwala, S. Raniwala, R. L. Ray, R. Redwine, R. Reed, H. G. Ritter, J. B. Roberts, O. V. Rogachevskiy, J. L. Romero, A. Rose, C. Roy, L. Ruan, R. Sahoo, S. Sakai, I. Sakrejda, T. Sakuma, S. Salur, J. Sandweiss, E. Sangaline, J. Schambach, R. P. Scharenberg, N. Schmitz, T. R. Schuster, J. Seele, J. Seger, I. Selyuzhenkov, P. Seyboth, E. Shahaliev, M. Shao, M. Sharma, S. S. Shi, E. P. Sichtermann, F. Simon, R. N. Singaraju, M. J. Skoby, N. Smirnov, P. Sorensen, J. Sowinski, H. M. Spinka, B. Srivastava, T. D. S. Stanislaus, D. Staszak, J. R. Stevens, R. Stock, M. Strikhanov, B. Stringfellow, A. A. P. Suaide, M. C. Suarez, N. L. Subba, M. Sumbera, X. M. Sun, Y. Sun, Z. Sun, B. Surrow, D. N. Svirida, T. J. M. Symons, A. Szanto de Toledo, J. Takahashi, A. H. Tang, Z. Tang, L. H. Tarini, T. Tarnowsky, D. Thein, J. H. Thomas, J. Tian, A. R. Timmins, S. Timoshenko, D. Tlusty, M. Tokarev, V. N. Tram, S. Trentalange, R. E. Tribble, O. D. Tsai, J. Ulery, T. Ullrich, D. G. Underwood, G. Van Buren, M. van Leeuwen, G. van Nieuwenhuizen, J. A. Vanfossen, R. Varma, G. M. S. Vasconcelos, A. N. Vasiliev, F. Videbaek, Y. P. Viyogi, S. Vokal, S. A. Voloshin, M. Wada, M. Walker, F. Wang, G. Wang, H. Wang, J. S. Wang, Q. Wang, X. L. Wang, Y. Wang, G. Webb, J. C. Webb, G. D. Westfall, C. Whitten, H. Wieman, S. W. Wissink, R. Witt, Y. F. Wu, W. Xie, N. Xu, Q. H. Xu, W. Xu, Y. Xu, Z. Xu, L. Xue, Y. Yang, P. Yepes, K. Yip, I-K. Yoo, Q. Yue, M. Zawisza, H. Zbroszczyk, W. Zhan, J. B. Zhang, S. Zhang, W. M. Zhang, X. P. Zhang, Y. Zhang, Z. P. Zhang, J. Zhao, C. Zhong, J. Zhou, W. Zhou, X. Zhu, Y. H. Zhu, R. Zoulkarneev, and Y. Zoulkarneeva
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Nuclear Theory, Kinetic energy, 01 natural sciences, Hadronization, Pion, Pseudorapidity, 0103 physical sciences, High Energy Physics::Experiment, Rapidity, Production (computer science), Nuclear Experiment, 010306 general physics, Centrality, Nucleon
Abstract: Balance functions have been measured for charged-particle pairs, identified charged-pion pairs, and identified charged-kaon pairs in $\mathrm{Au}+\mathrm{Au}$, $d+\mathrm{Au}$, and $p+p$ collisions at $\sqrt{{s}_{\mathit{NN}}}=200$ GeV at the Relativistic Heavy Ion Collider using the STAR detector. These balance functions are presented in terms of relative pseudorapidity, $\ensuremath{\Delta}\ensuremath{\eta}$, relative rapidity, $\ensuremath{\Delta}y$, relative azimuthal angle, $\ensuremath{\Delta}\ensuremath{\phi}$, and invariant relative momentum, ${q}_{\mathrm{inv}}$. For charged-particle pairs, the width of the balance function in terms of $\ensuremath{\Delta}\ensuremath{\eta}$ scales smoothly with the number of participating nucleons, while hijing and urqmd model calculations show no dependence on centrality or system size. For charged-particle and charged-pion pairs, the balance functions widths in terms of $\ensuremath{\Delta}\ensuremath{\eta}$ and $\ensuremath{\Delta}y$ are narrower in central $\mathrm{Au}+\mathrm{Au}$ collisions than in peripheral collisions. The width for central collisions is consistent with thermal blast-wave models where the balancing charges are highly correlated in coordinate space at breakup. This strong correlation might be explained by either delayed hadronization or limited diffusion during the reaction. Furthermore, the narrowing trend is consistent with the lower kinetic temperatures inherent to more central collisions. In contrast, the width of the balance function for charged-kaon pairs in terms of $\ensuremath{\Delta}y$ shows little centrality dependence, which may signal a different production mechanism for kaons. The widths of the balance functions for charged pions and kaons in terms of ${q}_{\mathrm{inv}}$ narrow in central collisions compared to peripheral collisions, which may be driven by the change in the kinetic temperature.
Published: 2010

39. Υcross section inp+pcollisions ats=200 GeV

Author: B. I. Abelev, M. M. Aggarwal, Z. Ahammed, A. V. Alakhverdyants, B. D. Anderson, D. Arkhipkin, G. S. Averichev, J. Balewski, L. S. Barnby, S. Baumgart, D. R. Beavis, R. Bellwied, M. J. Betancourt, R. R. Betts, A. Bhasin, A. K. Bhati, H. Bichsel, J. Bielcik, J. Bielcikova, B. Biritz, L. C. Bland, B. E. Bonner, J. Bouchet, E. Braidot, A. V. Brandin, A. Bridgeman, E. Bruna, S. Bueltmann, I. Bunzarov, T. P. Burton, X. Z. Cai, H. Caines, M. Calderón de la Barca Sánchez, O. Catu, D. Cebra, R. Cendejas, M. C. Cervantes, Z. Chajecki, P. Chaloupka, S. Chattopadhyay, H. F. Chen, J. H. Chen, J. Y. Chen, J. Cheng, M. Cherney, A. Chikanian, K. E. Choi, W. Christie, P. Chung, R. F. Clarke, M. J. M. Codrington, R. Corliss, M. R. Cosentino, J. G. Cramer, H. J. Crawford, D. Das, S. Dash, A. Davila Leyva, L. C. De Silva, R. R. Debbe, T. G. Dedovich, M. DePhillips, A. A. Derevschikov, R. Derradi de Souza, L. Didenko, P. Djawotho, S. M. Dogra, X. Dong, J. L. Drachenberg, J. E. Draper, J. C. Dunlop, M. R. Dutta Mazumdar, L. G. Efimov, E. Elhalhuli, M. Elnimr, J. Engelage, G. Eppley, B. Erazmus, M. Estienne, L. Eun, O. Evdokimov, P. Fachini, R. Fatemi, J. Fedorisin, R. G. Fersch, P. Filip, E. Finch, V. Fine, Y. Fisyak, C. A. Gagliardi, D. R. Gangadharan, M. S. Ganti, E. J. Garcia-Solis, A. Geromitsos, F. Geurts, V. Ghazikhanian, P. Ghosh, Y. N. Gorbunov, A. Gordon, O. Grebenyuk, D. Grosnick, B. Grube, S. M. Guertin, A. Gupta, N. Gupta, W. Guryn, B. Haag, T. J. Hallman, A. Hamed, L-X. Han, J. W. Harris, J. P. Hays-Wehle, M. Heinz, S. Heppelmann, A. Hirsch, E. Hjort, A. M. Hoffman, G. W. Hoffmann, D. J. Hofman, R. S. Hollis, H. Z. Huang, T. J. Humanic, L. Huo, G. Igo, A. Iordanova, P. Jacobs, W. W. Jacobs, P. Jakl, C. Jena, F. Jin, C. L. Jones, P. G. Jones, J. Joseph, E. G. Judd, S. Kabana, K. Kajimoto, K. Kang, J. Kapitan, K. Kauder, D. Keane, A. Kechechyan, D. Kettler, D. P. Kikola, J. Kiryluk, A. Kisiel, A. G. Knospe, A. Kocoloski, D. D. Koetke, T. Kollegger, J. Konzer, M. Kopytine, I. Koralt, W. Korsch, L. Kotchenda, V. Kouchpil, P. Kravtsov, K. Krueger, M. Krus, L. Kumar, P. Kurnadi, M. A. C. Lamont, J. M. Landgraf, S. LaPointe, J. Lauret, A. Lebedev, R. Lednicky, C-H. Lee, J. H. Lee, W. Leight, M. J. LeVine, C. Li, L. Li, N. Li, W. Li, X. Li, Y. Li, Z. Li, G. Lin, S. J. Lindenbaum, M. A. Lisa, F. Liu, H. Liu, J. Liu, T. Ljubicic, W. J. Llope, R. S. Longacre, W. A. Love, Y. Lu, G. L. Ma, Y. G. Ma, D. P. Mahapatra, R. Majka, O. I. Mall, L. K. Mangotra, R. Manweiler, S. Margetis, C. Markert, H. Masui, H. S. Matis, Yu. A. Matulenko, D. McDonald, T. S. McShane, A. Meschanin, R. Milner, N. G. Minaev, S. Mioduszewski, A. Mischke, M. K. Mitrovski, B. Mohanty, M. M. Mondal, D. A. Morozov, M. G. Munhoz, B. K. Nandi, C. Nattrass, T. K. Nayak, J. M. Nelson, P. K. Netrakanti, M. J. Ng, L. V. Nogach, S. B. Nurushev, G. Odyniec, A. Ogawa, H. Okada, V. Okorokov, D. Olson, M. Pachr, B. S. Page, S. K. Pal, Y. Pandit, Y. Panebratsev, T. Pawlak, T. Peitzmann, V. Perevoztchikov, C. Perkins, W. Peryt, S. C. Phatak, P. Pile, M. Planinic, M. A. Ploskon, J. Pluta, D. Plyku, N. Poljak, A. M. Poskanzer, B. V. K. S. Potukuchi, C. B. Powell, D. Prindle, C. Pruneau, N. K. Pruthi, P. R. Pujahari, J. Putschke, R. Raniwala, S. Raniwala, R. L. Ray, R. Redwine, R. Reed, J. M. Rehberg, H. G. Ritter, J. B. Roberts, O. V. Rogachevskiy, J. L. Romero, A. Rose, C. Roy, L. Ruan, R. Sahoo, S. Sakai, I. Sakrejda, T. Sakuma, S. Salur, J. Sandweiss, E. Sangaline, J. Schambach, R. P. Scharenberg, N. Schmitz, T. R. Schuster, J. Seele, J. Seger, I. Selyuzhenkov, P. Seyboth, E. Shahaliev, M. Shao, M. Sharma, S. S. Shi, E. P. Sichtermann, F. Simon, R. N. Singaraju, M. J. Skoby, N. Smirnov, P. Sorensen, J. Sowinski, H. M. Spinka, B. Srivastava, T. D. S. Stanislaus, D. Staszak, J. R. Stevens, R. Stock, M. Strikhanov, B. Stringfellow, A. A. P. Suaide, M. C. Suarez, N. L. Subba, M. Sumbera, X. M. Sun, Y. Sun, Z. Sun, B. Surrow, T. J. M. Symons, A. Szanto de Toledo, J. Takahashi, A. H. Tang, Z. Tang, L. H. Tarini, T. Tarnowsky, D. Thein, J. H. Thomas, J. Tian, A. R. Timmins, S. Timoshenko, D. Tlusty, M. Tokarev, T. A. Trainor, V. N. Tram, S. Trentalange, R. E. Tribble, O. D. Tsai, J. Ulery, T. Ullrich, D. G. Underwood, G. Van Buren, M. van Leeuwen, G. van Nieuwenhuizen, J. A. Vanfossen, R. Varma, G. M. S. Vasconcelos, A. N. Vasiliev, F. Videbaek, Y. P. Viyogi, S. Vokal, S. A. Voloshin, M. Wada, M. Walker, F. Wang, G. Wang, H. Wang, J. S. Wang, Q. Wang, X. L. Wang, Y. Wang, G. Webb, J. C. Webb, G. D. Westfall, C. Whitten, H. Wieman, E. Wingfield, S. W. Wissink, R. Witt, Y. Wu, W. Xie, N. Xu, Q. H. Xu, W. Xu, Y. Xu, Z. Xu, L. Xue, Y. Yang, P. Yepes, K. Yip, I-K. Yoo, Q. Yue, M. Zawisza, H. Zbroszczyk, W. Zhan, S. Zhang, W. M. Zhang, X. P. Zhang, Y. Zhang, Z. P. Zhang, J. Zhao, C. Zhong, J. Zhou, W. Zhou, X. Zhu, Y. H. Zhu, R. Zoulkarneev, and Y. Zoulkarneeva
Subjects: Physics, Quantum chromodynamics, Nuclear and High Energy Physics, Particle physics, Antiparticle, Meson, 010308 nuclear & particles physics, Hadron, Drell–Yan process, Perturbative QCD, 01 natural sciences, Nuclear physics, Color model, Antimatter, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics
Abstract: We report on a measurement of the gamma(1S + 2S + 3S) -> e(+)e(-) cross section at midrapidity in p + p collisions at root s = 200 GeV. We find the cross section to be 114 +/- 38(stat + fit)(-24)(+23)(syst) pb. Perturbative QCD calculations at next-to-leading order in the color evaporation model are in agreement with our measurement, while calculations in the color singlet model underestimate it by 2 sigma. Our result is consistent with the trend seen in world data as a function of the center-of-mass energy of the collision and extends the availability of gamma data to RHIC energies. The dielectron continuum in the invariant-mass range near the gamma is also studied to obtain a combined yield of e(+)e(-) pairs from the sum of the Drell-Yan process and b-(b) over bar production.
Published: 2010

40. Inclusiveπ0,η, and direct photon production at high transverse momentum inp+pandd+Aucollisions atsNN=200GeV

Author: B. I. Abelev, M. M. Aggarwal, Z. Ahammed, A. V. Alakhverdyants, B. D. Anderson, D. Arkhipkin, G. S. Averichev, J. Balewski, O. Barannikova, L. S. Barnby, S. Baumgart, D. R. Beavis, R. Bellwied, F. Benedosso, M. J. Betancourt, R. R. Betts, A. Bhasin, A. K. Bhati, H. Bichsel, J. Bielcik, J. Bielcikova, B. Biritz, L. C. Bland, B. E. Bonner, J. Bouchet, E. Braidot, A. V. Brandin, A. Bridgeman, E. Bruna, S. Bueltmann, I. Bunzarov, T. P. Burton, X. Z. Cai, H. Caines, M. Calderón de la Barca Sánchez, O. Catu, D. Cebra, R. Cendejas, M. C. Cervantes, Z. Chajecki, P. Chaloupka, S. Chattopadhyay, H. F. Chen, J. H. Chen, J. Y. Chen, J. Cheng, M. Cherney, A. Chikanian, K. E. Choi, W. Christie, P. Chung, R. F. Clarke, M. J. M. Codrington, R. Corliss, J. G. Cramer, H. J. Crawford, D. Das, S. Dash, A. Davila Leyva, L. C. De Silva, R. R. Debbe, T. G. Dedovich, M. DePhillips, A. A. Derevschikov, R. Derradi de Souza, L. Didenko, P. Djawotho, S. M. Dogra, X. Dong, J. L. Drachenberg, J. E. Draper, J. C. Dunlop, M. R. Dutta Mazumdar, L. G. Efimov, E. Elhalhuli, M. Elnimr, J. Engelage, G. Eppley, B. Erazmus, M. Estienne, L. Eun, P. Fachini, R. Fatemi, J. Fedorisin, R. G. Fersch, P. Filip, E. Finch, V. Fine, Y. Fisyak, C. A. Gagliardi, D. R. Gangadharan, M. S. Ganti, E. J. Garcia-Solis, A. Geromitsos, F. Geurts, V. Ghazikhanian, P. Ghosh, Y. N. Gorbunov, A. Gordon, O. Grebenyuk, D. Grosnick, B. Grube, S. M. Guertin, A. Gupta, N. Gupta, W. Guryn, B. Haag, T. J. Hallman, A. Hamed, L.-X. Han, J. W. Harris, J. P. Hays-Wehle, M. Heinz, S. Heppelmann, A. Hirsch, E. Hjort, A. M. Hoffman, G. W. Hoffmann, D. J. Hofman, R. S. Hollis, H. Z. Huang, T. J. Humanic, L. Huo, G. Igo, A. Iordanova, P. Jacobs, W. W. Jacobs, P. Jakl, C. Jena, F. Jin, C. L. Jones, P. G. Jones, J. Joseph, E. G. Judd, S. Kabana, K. Kajimoto, K. Kang, J. Kapitan, K. Kauder, D. Keane, A. Kechechyan, D. Kettler, D. P. Kikola, J. Kiryluk, A. Kisiel, S. R. Klein, A. G. Knospe, A. Kocoloski, D. D. Koetke, T. Kollegger, J. Konzer, M. Kopytine, I. Koralt, W. Korsch, L. Kotchenda, V. Kouchpil, P. Kravtsov, K. Krueger, M. Krus, L. Kumar, P. Kurnadi, M. A. C. Lamont, J. M. Landgraf, S. LaPointe, J. Lauret, A. Lebedev, R. Lednicky, C.-H. Lee, J. H. Lee, W. Leight, M. J. LeVine, C. Li, L. Li, N. Li, W. Li, X. Li, Y. Li, Z. Li, G. Lin, S. J. Lindenbaum, M. A. Lisa, F. Liu, H. Liu, J. Liu, T. Ljubicic, W. J. Llope, R. S. Longacre, W. A. Love, Y. Lu, G. L. Ma, Y. G. Ma, D. P. Mahapatra, R. Majka, O. I. Mall, L. K. Mangotra, R. Manweiler, S. Margetis, C. Markert, H. Masui, H. S. Matis, Yu. A. Matulenko, D. McDonald, T. S. McShane, A. Meschanin, R. Milner, N. G. Minaev, S. Mioduszewski, A. Mischke, M. K. Mitrovski, B. Mohanty, M. M. Mondal, D. A. Morozov, M. G. Munhoz, B. K. Nandi, C. Nattrass, T. K. Nayak, J. M. Nelson, P. K. Netrakanti, M. J. Ng, L. V. Nogach, S. B. Nurushev, G. Odyniec, A. Ogawa, H. Okada, V. Okorokov, D. Olson, M. Pachr, B. S. Page, S. K. Pal, Y. Pandit, Y. Panebratsev, T. Pawlak, T. Peitzmann, V. Perevoztchikov, C. Perkins, W. Peryt, S. C. Phatak, P. Pile, M. Planinic, M. A. Ploskon, J. Pluta, D. Plyku, N. Poljak, A. M. Poskanzer, B. V. K. S. Potukuchi, C. B. Powell, D. Prindle, C. Pruneau, N. K. Pruthi, P. R. Pujahari, J. Putschke, R. Raniwala, S. Raniwala, R. L. Ray, R. Redwine, R. Reed, J. M. Rehberg, H. G. Ritter, J. B. Roberts, O. V. Rogachevskiy, J. L. Romero, A. Rose, C. Roy, L. Ruan, M. J. Russcher, R. Sahoo, S. Sakai, I. Sakrejda, T. Sakuma, S. Salur, J. Sandweiss, E. Sangaline, J. Schambach, R. P. Scharenberg, N. Schmitz, T. R. Schuster, J. Seele, J. Seger, I. Selyuzhenkov, P. Seyboth, E. Shahaliev, M. Shao, M. Sharma, S. S. Shi, E. P. Sichtermann, F. Simon, R. N. Singaraju, M. J. Skoby, N. Smirnov, P. Sorensen, J. Sowinski, H. M. Spinka, B. Srivastava, T. D. S. Stanislaus, D. Staszak, J. R. Stevens, R. Stock, M. Strikhanov, B. Stringfellow, A. A. P. Suaide, M. C. Suarez, N. L. Subba, M. Sumbera, X. M. Sun, Y. Sun, Z. Sun, B. Surrow, T. J. M. Symons, A. Szanto de Toledo, J. Takahashi, A. H. Tang, Z. Tang, L. H. Tarini, T. Tarnowsky, D. Thein, J. H. Thomas, J. Tian, A. R. Timmins, S. Timoshenko, D. Tlusty, M. Tokarev, T. A. Trainor, V. N. Tram, S. Trentalange, R. E. Tribble, O. D. Tsai, J. Ulery, T. Ullrich, D. G. Underwood, G. Van Buren, G. van Nieuwenhuizen, J. A. Vanfossen, R. Varma, G. M. S. Vasconcelos, A. N. Vasiliev, F. Videbaek, Y. P. Viyogi, S. Vokal, S. A. Voloshin, M. Wada, M. Walker, F. Wang, G. Wang, H. Wang, J. S. Wang, Q. Wang, X. Wang, X. L. Wang, Y. Wang, G. Webb, J. C. Webb, G. D. Westfall, C. Whitten, H. Wieman, E. Wingfield, S. W. Wissink, R. Witt, Y. Wu, W. Xie, N. Xu, Q. H. Xu, W. Xu, Y. Xu, Z. Xu, L. Xue, Y. Yang, P. Yepes, K. Yip, I.-K. Yoo, Q. Yue, M. Zawisza, H. Zbroszczyk, W. Zhan, S. Zhang, W. M. Zhang, X. P. Zhang, Y. Zhang, Z. P. Zhang, J. Zhao, C. Zhong, J. Zhou, W. Zhou, X. Zhu, Y. H. Zhu, R. Zoulkarneev, and Y. Zoulkarneeva
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Photon, Meson, 010308 nuclear & particles physics, Hadron, Perturbative QCD, Elementary particle, 7. Clean energy, 01 natural sciences, Nuclear physics, Particle decay, Pion, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Relativistic Heavy Ion Collider
Abstract: We report a measurement of high-p(T) inclusive pi(0), eta, and direct photon production in p + p and d + Au collisions at root s(NN) = 200 GeV at midrapidity (0 gamma gamma were detected in the barrel electromagnetic calorimeter of the STAR experiment at the Relativistic Heavy Ion Collider. The eta -> gamma gamma decay was also observed and constituted the first eta measurement by STAR. The first direct photon cross-section measurement by STAR is also presented; the signal was extracted statistically by subtracting the pi(0), eta, and omega(782) decay background from the inclusive photon distribution observed in the calorimeter. The analysis is described in detail, and the results are found to be in good agreement with earlier measurements and with next-to-leading-order perturbative QCD calculations.
Published: 2010

41. Spectra of identified high-pTπ±andp(p¯)inCu+Cucollisions atsNN=200GeV

Author: B. I. Abelev, M. M. Aggarwal, Z. Ahammed, A. V. Alakhverdyants, B. D. Anderson, D. Arkhipkin, G. S. Averichev, J. Balewski, L. S. Barnby, S. Baumgart, D. R. Beavis, R. Bellwied, F. Benedosso, M. J. Betancourt, R. R. Betts, A. Bhasin, A. K. Bhati, H. Bichsel, J. Bielcik, J. Bielcikova, B. Biritz, L. C. Bland, B. E. Bonner, J. Bouchet, E. Braidot, A. V. Brandin, A. Bridgeman, E. Bruna, S. Bueltmann, I. Bunzarov, T. P. Burton, X. Z. Cai, H. Caines, M. Calderón de la Barca Sánchez, O. Catu, D. Cebra, R. Cendejas, M. C. Cervantes, Z. Chajecki, P. Chaloupka, S. Chattopadhyay, H. F. Chen, J. H. Chen, J. Y. Chen, J. Cheng, M. Cherney, A. Chikanian, K. E. Choi, W. Christie, P. Chung, R. F. Clarke, M. J. M. Codrington, R. Corliss, J. G. Cramer, H. J. Crawford, D. Das, S. Dash, A. Davila Leyva, L. C. De Silva, R. R. Debbe, T. G. Dedovich, M. DePhillips, A. A. Derevschikov, R. Derradi de Souza, L. Didenko, P. Djawotho, S. M. Dogra, X. Dong, J. L. Drachenberg, J. E. Draper, J. C. Dunlop, M. R. Dutta Mazumdar, L. G. Efimov, E. Elhalhuli, M. Elnimr, J. Engelage, G. Eppley, B. Erazmus, M. Estienne, L. Eun, O. Evdokimov, P. Fachini, R. Fatemi, J. Fedorisin, R. G. Fersch, P. Filip, E. Finch, V. Fine, Y. Fisyak, C. A. Gagliardi, D. R. Gangadharan, M. S. Ganti, E. J. Garcia-Solis, A. Geromitsos, F. Geurts, V. Ghazikhanian, P. Ghosh, Y. N. Gorbunov, A. Gordon, O. Grebenyuk, D. Grosnick, B. Grube, S. M. Guertin, A. Gupta, N. Gupta, W. Guryn, B. Haag, T. J. Hallman, A. Hamed, L.-X. Han, J. W. Harris, J. P. Hays-Wehle, M. Heinz, S. Heppelmann, A. Hirsch, E. Hjort, A. M. Hoffman, G. W. Hoffmann, D. J. Hofman, R. S. Hollis, H. Z. Huang, T. J. Humanic, L. Huo, G. Igo, A. Iordanova, P. Jacobs, W. W. Jacobs, P. Jakl, C. Jena, F. Jin, C. L. Jones, P. G. Jones, J. Joseph, E. G. Judd, S. Kabana, K. Kajimoto, K. Kang, J. Kapitan, K. Kauder, D. Keane, A. Kechechyan, D. Kettler, D. P. Kikola, J. Kiryluk, A. Kisiel, S. R. Klein, A. G. Knospe, A. Kocoloski, D. D. Koetke, T. Kollegger, J. Konzer, M. Kopytine, I. Koralt, W. Korsch, L. Kotchenda, V. Kouchpil, P. Kravtsov, K. Krueger, M. Krus, L. Kumar, P. Kurnadi, M. A. C. Lamont, J. M. Landgraf, S. LaPointe, J. Lauret, A. Lebedev, R. Lednicky, C.-H. Lee, J. H. Lee, W. Leight, M. J. LeVine, C. Li, L. Li, N. Li, W. Li, X. Li, Y. Li, Z. Li, G. Lin, S. J. Lindenbaum, M. A. Lisa, F. Liu, H. Liu, J. Liu, T. Ljubicic, W. J. Llope, R. S. Longacre, W. A. Love, Y. Lu, G. L. Ma, Y. G. Ma, D. P. Mahapatra, R. Majka, O. I. Mall, L. K. Mangotra, R. Manweiler, S. Margetis, C. Markert, H. Masui, H. S. Matis, Yu. A. Matulenko, D. McDonald, T. S. McShane, A. Meschanin, R. Milner, N. G. Minaev, S. Mioduszewski, A. Mischke, M. K. Mitrovski, B. Mohanty, M. M. Mondal, D. A. Morozov, M. G. Munhoz, B. K. Nandi, C. Nattrass, T. K. Nayak, J. M. Nelson, P. K. Netrakanti, M. J. Ng, L. V. Nogach, S. B. Nurushev, G. Odyniec, A. Ogawa, H. Okada, V. Okorokov, D. Olson, M. Pachr, B. S. Page, S. K. Pal, Y. Pandit, Y. Panebratsev, T. Pawlak, T. Peitzmann, V. Perevoztchikov, C. Perkins, W. Peryt, S. C. Phatak, P. Pile, M. Planinic, M. A. Ploskon, J. Pluta, D. Plyku, N. Poljak, A. M. Poskanzer, B. V. K. S. Potukuchi, C. B. Powell, D. Prindle, C. Pruneau, N. K. Pruthi, P. R. Pujahari, J. Putschke, R. Raniwala, S. Raniwala, R. L. Ray, R. Redwine, R. Reed, J. M. Rehberg, H. G. Ritter, J. B. Roberts, O. V. Rogachevskiy, J. L. Romero, A. Rose, C. Roy, L. Ruan, M. J. Russcher, R. Sahoo, S. Sakai, I. Sakrejda, T. Sakuma, S. Salur, J. Sandweiss, E. Sangaline, J. Schambach, R. P. Scharenberg, N. Schmitz, T. R. Schuster, J. Seele, J. Seger, I. Selyuzhenkov, P. Seyboth, E. Shahaliev, M. Shao, M. Sharma, S. S. Shi, E. P. Sichtermann, F. Simon, R. N. Singaraju, M. J. Skoby, N. Smirnov, P. Sorensen, J. Sowinski, H. M. Spinka, B. Srivastava, T. D. S. Stanislaus, D. Staszak, J. R. Stevens, R. Stock, M. Strikhanov, B. Stringfellow, A. A. P. Suaide, M. C. Suarez, N. L. Subba, M. Sumbera, X. M. Sun, Y. Sun, Z. Sun, B. Surrow, T. J. M. Symons, A. Szanto de Toledo, J. Takahashi, A. H. Tang, Z. Tang, L. H. Tarini, T. Tarnowsky, D. Thein, J. H. Thomas, J. Tian, A. R. Timmins, S. Timoshenko, D. Tlusty, M. Tokarev, T. A. Trainor, V. N. Tram, S. Trentalange, R. E. Tribble, O. D. Tsai, J. Ulery, T. Ullrich, D. G. Underwood, G. Van Buren, G. van Nieuwenhuizen, J. A. Vanfossen, R. Varma, G. M. S. Vasconcelos, A. N. Vasiliev, F. Videbaek, Y. P. Viyogi, S. Vokal, S. A. Voloshin, M. Wada, M. Walker, F. Wang, G. Wang, H. Wang, J. S. Wang, Q. Wang, X. Wang, X. L. Wang, Y. Wang, G. Webb, J. C. Webb, G. D. Westfall, C. Whitten, H. Wieman, E. Wingfield, S. W. Wissink, R. Witt, Y. Wu, W. Xie, N. Xu, Q. H. Xu, W. Xu, Y. Xu, Z. Xu, L. Xue, Y. Yang, P. Yepes, K. Yip, I.-K. Yoo, Q. Yue, M. Zawisza, H. Zbroszczyk, W. Zhan, S. Zhang, W. M. Zhang, X. P. Zhang, Y. Zhang, Z. P. Zhang, J. Zhao, C. Zhong, J. Zhou, W. Zhou, X. Zhu, Y. H. Zhu, R. Zoulkarneev, and Y. Zoulkarneeva
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Proton, Meson, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Nuclear Theory, Hadron, 01 natural sciences, Baryon, Pion, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Relativistic Heavy Ion Collider, QCD matter, STAR detector
Abstract: We report new results on identified (anti)proton and charged pion spectra at large transverse momenta ($3l{p}_{T}l10$ GeV$/c$) from $\mathrm{Cu}+\mathrm{Cu}$ collisions at $\sqrt{{s}_{\mathit{NN}}}=200$ GeV using the STAR detector at the Relativistic Heavy Ion Collider (RHIC). This study explores the system size dependence of two novel features observed at RHIC with heavy ions: the hadron suppression at high-${p}_{T}$ and the anomalous baryon to meson enhancement at intermediate transverse momenta. Both phenomena could be attributed to the creation of a new form of QCD matter. The results presented here bridge the system size gap between the available $\mathit{pp}$ and $\mathrm{Au}+\mathrm{Au}$ data, and allow for a detailed exploration of the onset of the novel features. Comparative analysis of all available 200 GeV data indicates that the system size is a major factor determining both the magnitude of the hadron spectra suppression at large transverse momenta and the relative baryon to meson enhancement.
Published: 2010

42. Charged and strange hadron elliptic flow inCu+Cucollisions atsNN=62.4and 200 GeV

Author: B. I. Abelev, M. M. Aggarwal, Z. Ahammed, A. V. Alakhverdyants, I. Alekseev, B. D. Anderson, D. Arkhipkin, G. S. Averichev, J. Balewski, L. S. Barnby, S. Baumgart, D. R. Beavis, R. Bellwied, M. J. Betancourt, R. R. Betts, A. Bhasin, A. K. Bhati, H. Bichsel, J. Bielcik, J. Bielcikova, B. Biritz, L. C. Bland, B. E. Bonner, J. Bouchet, E. Braidot, A. V. Brandin, A. Bridgeman, E. Bruna, S. Bueltmann, I. Bunzarov, T. P. Burton, X. Z. Cai, H. Caines, M. Calderón de la Barca Sánchez, O. Catu, D. Cebra, R. Cendejas, M. C. Cervantes, Z. Chajecki, P. Chaloupka, S. Chattopadhyay, H. F. Chen, J. H. Chen, J. Y. Chen, J. Cheng, M. Cherney, A. Chikanian, K. E. Choi, W. Christie, P. Chung, R. F. Clarke, M. J. M. Codrington, R. Corliss, J. G. Cramer, H. J. Crawford, D. Das, S. Dash, A. Davila Leyva, L. C. De Silva, R. R. Debbe, T. G. Dedovich, M. DePhillips, A. A. Derevschikov, R. Derradi de Souza, L. Didenko, P. Djawotho, S. M. Dogra, X. Dong, J. L. Drachenberg, J. E. Draper, J. C. Dunlop, M. R. Dutta Mazumdar, L. G. Efimov, E. Elhalhuli, M. Elnimr, J. Engelage, G. Eppley, B. Erazmus, M. Estienne, L. Eun, O. Evdokimov, P. Fachini, R. Fatemi, J. Fedorisin, R. G. Fersch, P. Filip, E. Finch, V. Fine, Y. Fisyak, C. A. Gagliardi, D. R. Gangadharan, M. S. Ganti, E. J. Garcia-Solis, A. Geromitsos, F. Geurts, V. Ghazikhanian, P. Ghosh, Y. N. Gorbunov, A. Gordon, O. Grebenyuk, D. Grosnick, B. Grube, S. M. Guertin, A. Gupta, N. Gupta, W. Guryn, B. Haag, A. Hamed, L.-X. Han, J. W. Harris, J. P. Hays-Wehle, M. Heinz, S. Heppelmann, A. Hirsch, E. Hjort, A. M. Hoffman, G. W. Hoffmann, D. J. Hofman, R. S. Hollis, H. Z. Huang, T. J. Humanic, L. Huo, G. Igo, A. Iordanova, P. Jacobs, W. W. Jacobs, P. Jakl, C. Jena, F. Jin, C. L. Jones, P. G. Jones, J. Joseph, E. G. Judd, S. Kabana, K. Kajimoto, K. Kang, J. Kapitan, K. Kauder, D. Keane, A. Kechechyan, D. Kettler, D. P. Kikola, J. Kiryluk, A. Kisiel, S. R. Klein, A. G. Knospe, A. Kocoloski, D. D. Koetke, T. Kollegger, J. Konzer, M. Kopytine, I. Koralt, L. Koroleva, W. Korsch, L. Kotchenda, V. Kouchpil, P. Kravtsov, K. Krueger, M. Krus, L. Kumar, P. Kurnadi, M. A. C. Lamont, J. M. Landgraf, S. LaPointe, J. Lauret, A. Lebedev, R. Lednicky, C.-H. Lee, J. H. Lee, W. Leight, M. J. LeVine, C. Li, L. Li, N. Li, W. Li, X. Li, Y. Li, Z. Li, G. Lin, S. J. Lindenbaum, M. A. Lisa, F. Liu, H. Liu, J. Liu, T. Ljubicic, W. J. Llope, R. S. Longacre, W. A. Love, Y. Lu, G. L. Ma, Y. G. Ma, D. P. Mahapatra, R. Majka, O. I. Mall, L. K. Mangotra, R. Manweiler, S. Margetis, C. Markert, H. Masui, H. S. Matis, Yu. A. Matulenko, D. McDonald, T. S. McShane, A. Meschanin, R. Milner, N. G. Minaev, S. Mioduszewski, A. Mischke, M. K. Mitrovski, B. Mohanty, M. M. Mondal, B. Morozov, D. A. Morozov, M. G. Munhoz, B. K. Nandi, C. Nattrass, T. K. Nayak, J. M. Nelson, P. K. Netrakanti, M. J. Ng, L. V. Nogach, S. B. Nurushev, G. Odyniec, A. Ogawa, H. Okada, V. Okorokov, D. Olson, M. Pachr, B. S. Page, S. K. Pal, Y. Pandit, Y. Panebratsev, T. Pawlak, T. Peitzmann, V. Perevoztchikov, C. Perkins, W. Peryt, S. C. Phatak, P. Pile, M. Planinic, M. A. Ploskon, J. Pluta, D. Plyku, N. Poljak, A. M. Poskanzer, B. V. K. S. Potukuchi, C. B. Powell, D. Prindle, C. Pruneau, N. K. Pruthi, P. R. Pujahari, J. Putschke, R. Raniwala, S. Raniwala, R. L. Ray, R. Redwine, R. Reed, J. M. Rehberg, H. G. Ritter, J. B. Roberts, O. V. Rogachevskiy, J. L. Romero, A. Rose, C. Roy, L. Ruan, R. Sahoo, S. Sakai, I. Sakrejda, T. Sakuma, S. Salur, J. Sandweiss, E. Sangaline, J. Schambach, R. P. Scharenberg, N. Schmitz, T. R. Schuster, J. Seele, J. Seger, I. Selyuzhenkov, P. Seyboth, E. Shahaliev, M. Shao, M. Sharma, S. S. Shi, X. H. Shi, E. P. Sichtermann, F. Simon, R. N. Singaraju, M. J. Skoby, N. Smirnov, P. Sorensen, J. Sowinski, H. M. Spinka, B. Srivastava, T. D. S. Stanislaus, D. Staszak, J. R. Stevens, R. Stock, M. Strikhanov, B. Stringfellow, A. A. P. Suaide, M. C. Suarez, N. L. Subba, M. Sumbera, X. M. Sun, Y. Sun, Z. Sun, B. Surrow, D. N. Svirida, T. J. M. Symons, A. Szanto de Toledo, J. Takahashi, A. H. Tang, Z. Tang, L. H. Tarini, T. Tarnowsky, D. Thein, J. H. Thomas, J. Tian, A. R. Timmins, S. Timoshenko, D. Tlusty, M. Tokarev, V. N. Tram, S. Trentalange, R. E. Tribble, O. D. Tsai, J. Ulery, T. Ullrich, D. G. Underwood, G. Van Buren, M. van Leeuwen, G. van Nieuwenhuizen, J. A. Vanfossen, R. Varma, G. M. S. Vasconcelos, A. N. Vasiliev, F. Videbaek, Y. P. Viyogi, S. Vokal, S. A. Voloshin, M. Wada, M. Walker, F. Wang, G. Wang, H. Wang, J. S. Wang, Q. Wang, X. L. Wang, Y. Wang, G. Webb, J. C. Webb, G. D. Westfall, C. Whitten, H. Wieman, E. Wingfield, S. W. Wissink, R. Witt, Y. Wu, W. Xie, N. Xu, Q. H. Xu, W. Xu, Y. Xu, Z. Xu, L. Xue, Y. Yang, P. Yepes, K. Yip, I.-K. Yoo, Q. Yue, M. Zawisza, H. Zbroszczyk, W. Zhan, S. Zhang, W. M. Zhang, X. P. Zhang, Y. Zhang, Z. P. Zhang, J. Zhao, C. Zhong, J. Zhou, W. Zhou, X. Zhu, Y. H. Zhu, R. Zoulkarneev, and Y. Zoulkarneeva
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Meson, 010308 nuclear & particles physics, Elliptic flow, Hadron, Elementary particle, Kinetic energy, 01 natural sciences, Nuclear physics, 0103 physical sciences, Quark–gluon plasma, High Energy Physics::Experiment, Rapidity, Nuclear Experiment, 010306 general physics, Relativistic Heavy Ion Collider
Abstract: We present the results of an elliptic flow, v(2), analysis of Cu + Cu collisions recorded with the solenoidal tracker detector (STAR) at the BNL Relativistic Heavy Ion Collider at root s(NN) = 62.4 and 200 GeV. Elliptic flow as a function of transverse momentum, v(2)(p(T)), is reported for different collision centralities for charged hadrons h(+/-) and strangeness-ontaining hadrons K(S)(0), Lambda, Xi, and phi in the midrapidity region vertical bar eta vertical bar < 1.0. Significant reduction in systematic uncertainty of the measurement due to nonflow effects has been achieved by correlating particles at midrapidity, vertical bar eta vertical bar < 1.0, with those at forward rapidity, 2.5 < vertical bar eta vertical bar < 4.0. We also present azimuthal correlations in p + p collisions at root s = 200 GeV to help in estimating nonflow effects. To study the system-size dependence of elliptic flow, we present a detailed comparison with previously published results from Au + Au collisions at root s(NN) = 200 GeV. We observe that v(2)(p(T)) of strange hadrons has similar scaling properties as were first observed in Au + Au collisions, that is, (i) at low transverse momenta, p(T) < 2 GeV/c, v(2) scales with transverse kinetic energy, m(T) - m, and (ii) at intermediate p(T), 2 < p(T) < 4 GeV/c, it scales with the number of constituent quarks, n(q.) We have found that ideal hydrodynamic calculations fail to reproduce the centrality dependence of v(2)(p(T)) for K(S)(0) and Lambda. Eccentricity scaled v(2) values, v(2)/epsilon, are larger in more central collisions, suggesting stronger collective flow develops in more central collisions. The comparison with Au + Au collisions, which go further in density, shows that v(2)/epsilon depends on the system size, that is, the number of participants N(part). This indicates that the ideal hydrodynamic limit is not reached in Cu + Cu collisions, presumably because the assumption of thermalization is not attained.
Published: 2010

43. Observation ofπ+π−π+π−photoproduction in ultraperipheral heavy-ion collisions atsNN=200GeV at the STAR detector

Author: B. I. Abelev, M. M. Aggarwal, Z. Ahammed, A. V. Alakhverdyants, B. D. Anderson, D. Arkhipkin, G. S. Averichev, J. Balewski, L. S. Barnby, S. Baumgart, D. R. Beavis, R. Bellwied, F. Benedosso, M. J. Betancourt, R. R. Betts, A. Bhasin, A. K. Bhati, H. Bichsel, J. Bielcik, J. Bielcikova, B. Biritz, L. C. Bland, B. E. Bonner, J. Bouchet, E. Braidot, A. V. Brandin, A. Bridgeman, E. Bruna, S. Bueltmann, I. Bunzarov, T. P. Burton, X. Z. Cai, H. Caines, M. Calderón de la Barca Sánchez, O. Catu, D. Cebra, R. Cendejas, M. C. Cervantes, Z. Chajecki, P. Chaloupka, S. Chattopadhyay, H. F. Chen, J. H. Chen, J. Y. Chen, J. Cheng, M. Cherney, A. Chikanian, K. E. Choi, W. Christie, P. Chung, S. U. Chung, R. F. Clarke, M. J. M. Codrington, R. Corliss, J. G. Cramer, H. J. Crawford, D. Das, S. Dash, A. Davila Leyva, L. C. De Silva, R. R. Debbe, T. G. Dedovich, M. DePhillips, A. A. Derevschikov, R. Derradi de Souza, L. Didenko, P. Djawotho, S. M. Dogra, X. Dong, J. L. Drachenberg, J. E. Draper, J. C. Dunlop, M. R. Dutta Mazumdar, L. G. Efimov, E. Elhalhuli, M. Elnimr, J. Engelage, G. Eppley, B. Erazmus, M. Estienne, L. Eun, O. Evdokimov, P. Fachini, R. Fatemi, J. Fedorisin, R. G. Fersch, P. Filip, E. Finch, V. Fine, Y. Fisyak, C. A. Gagliardi, D. R. Gangadharan, M. S. Ganti, E. J. Garcia-Solis, A. Geromitsos, F. Geurts, V. Ghazikhanian, P. Ghosh, Y. N. Gorbunov, A. Gordon, O. Grebenyuk, D. Grosnick, B. Grube, S. M. Guertin, A. Gupta, N. Gupta, W. Guryn, B. Haag, T. J. Hallman, A. Hamed, L. -X. Han, J. W. Harris, J. P. Hays-Wehle, M. Heinz, S. Heppelmann, A. Hirsch, E. Hjort, A. M. Hoffman, G. W. Hoffmann, D. J. Hofman, R. S. Hollis, H. Z. Huang, T. J. Humanic, L. Huo, G. Igo, A. Iordanova, P. Jacobs, W. W. Jacobs, P. Jakl, C. Jena, F. Jin, C. L. Jones, P. G. Jones, J. Joseph, E. G. Judd, S. Kabana, K. Kajimoto, K. Kang, J. Kapitan, K. Kauder, D. Keane, A. Kechechyan, D. Kettler, D. P. Kikola, J. Kiryluk, A. Kisiel, S. R. Klein, A. G. Knospe, A. Kocoloski, D. D. Koetke, T. Kollegger, J. Konzer, M. Kopytine, I. Koralt, W. Korsch, L. Kotchenda, V. Kouchpil, P. Kravtsov, K. Krueger, M. Krus, L. Kumar, P. Kurnadi, M. A. C. Lamont, J. M. Landgraf, S. LaPointe, J. Lauret, A. Lebedev, R. Lednicky, C. -H. Lee, J. H. Lee, W. Leight, M. J. LeVine, C. Li, L. Li, N. Li, W. Li, X. Li, Y. Li, Z. Li, G. Lin, S. J. Lindenbaum, M. A. Lisa, F. Liu, H. Liu, J. Liu, T. Ljubicic, W. J. Llope, R. S. Longacre, W. A. Love, Y. Lu, G. L. Ma, Y. G. Ma, D. P. Mahapatra, R. Majka, O. I. Mall, L. K. Mangotra, R. Manweiler, S. Margetis, C. Markert, H. Masui, H. S. Matis, Yu. A. Matulenko, D. McDonald, T. S. McShane, A. Meschanin, R. Milner, N. G. Minaev, S. Mioduszewski, A. Mischke, M. K. Mitrovski, B. Mohanty, M. M. Mondal, D. A. Morozov, M. G. Munhoz, B. K. Nandi, C. Nattrass, T. K. Nayak, J. M. Nelson, P. K. Netrakanti, M. J. Ng, L. V. Nogach, S. B. Nurushev, G. Odyniec, A. Ogawa, H. Okada, V. Okorokov, D. Olson, M. Pachr, B. S. Page, S. K. Pal, Y. Pandit, Y. Panebratsev, T. Pawlak, T. Peitzmann, V. Perevoztchikov, C. Perkins, W. Peryt, S. C. Phatak, P. Pile, M. Planinic, M. A. Ploskon, J. Pluta, D. Plyku, N. Poljak, A. M. Poskanzer, B. V. K. S. Potukuchi, C. B. Powell, D. Prindle, C. Pruneau, N. K. Pruthi, P. R. Pujahari, J. Putschke, R. Raniwala, S. Raniwala, R. L. Ray, R. Redwine, R. Reed, J. M. Rehberg, H. G. Ritter, J. B. Roberts, O. V. Rogachevskiy, J. L. Romero, A. Rose, C. Roy, L. Ruan, M. J. Russcher, R. Sahoo, S. Sakai, I. Sakrejda, T. Sakuma, S. Salur, J. Sandweiss, E. Sangaline, J. Schambach, R. P. Scharenberg, N. Schmitz, T. R. Schuster, J. Seele, J. Seger, I. Selyuzhenkov, P. Seyboth, E. Shahaliev, M. Shao, M. Sharma, S. S. Shi, E. P. Sichtermann, F. Simon, R. N. Singaraju, M. J. Skoby, N. Smirnov, P. Sorensen, J. Sowinski, H. M. Spinka, B. Srivastava, T. D. S. Stanislaus, D. Staszak, J. R. Stevens, R. Stock, M. Strikhanov, B. Stringfellow, A. A. P. Suaide, M. C. Suarez, N. L. Subba, M. Sumbera, X. M. Sun, Y. Sun, Z. Sun, B. Surrow, T. J. M. Symons, A. Szanto de Toledo, J. Takahashi, A. H. Tang, Z. Tang, L. H. Tarini, T. Tarnowsky, D. Thein, J. H. Thomas, J. Tian, A. R. Timmins, S. Timoshenko, D. Tlusty, M. Tokarev, T. A. Trainor, V. N. Tram, S. Trentalange, R. E. Tribble, O. D. Tsai, J. Ulery, T. Ullrich, D. G. Underwood, G. Van Buren, G. van Nieuwenhuizen, J. A. Vanfossen, R. Varma, G. M. S. Vasconcelos, A. N. Vasiliev, F. Videbaek, Y. P. Viyogi, S. Vokal, S. A. Voloshin, M. Wada, M. Walker, F. Wang, G. Wang, H. Wang, J. S. Wang, Q. Wang, X. Wang, X. L. Wang, Y. Wang, G. Webb, J. C. Webb, G. D. Westfall, C. Whitten, H. Wieman, E. Wingfield, S. W. Wissink, R. Witt, Y. Wu, W. Xie, N. Xu, Q. H. Xu, W. Xu, Y. Xu, Z. Xu, L. Xue, Y. Yang, P. Yepes, K. Yip, I. -K. Yoo, Q. Yue, M. Zawisza, H. Zbroszczyk, W. Zhan, S. Zhang, W. M. Zhang, X. P. Zhang, Y. Zhang, Z. P. Zhang, J. Zhao, C. Zhong, J. Zhou, W. Zhou, X. Zhu, Y. H. Zhu, R. Zoulkarneev, and Y. Zoulkarneeva
Subjects: Nuclear reaction, Physics, Nuclear and High Energy Physics, Meson, 010308 nuclear & particles physics, Branching fraction, Hadron, Elementary particle, 01 natural sciences, Pion, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, 0103 physical sciences, Production (computer science), Atomic physics, 010306 general physics, Dimensionless quantity
Abstract: We present a measurement of pi{sup +}pi{sup -}pi{sup +}pi{sup -} photonuclear production in ultraperipheral Au-Au collisions at sq root(s{sub N{sub N}})=200 GeV from the STAR experiment. The pi{sup +}pi{sup -}pi{sup +}pi{sup -} final states are observed at low transverse momentum and are accompanied by mutual nuclear excitation of the beam particles. The strong enhancement of the production cross section at low transverse momentum is consistent with coherent photoproduction. The pi{sup +}pi{sup -}pi{sup +}pi{sup -} invariant mass spectrum of the coherent events exhibits a broad peak around 1540+-40 MeV/c{sup 2} with a width of 570+-60 MeV/c{sup 2}, in agreement with the photoproduction data for the rho{sup 0}(1700). We do not observe a corresponding peak in the pi{sup +}pi{sup -} final state and measure an upper limit for the ratio of the branching fractions of the rho{sup 0}(1700) to pi{sup +}pi{sup -} and pi{sup +}pi{sup -}pi{sup +}pi{sup -} of 2.5% at 90% confidence level. The ratio of rho{sup 0}(1700) and rho{sup 0}(770) coherent production cross sections is measured to be 13.4+-0.8{sub stat.}+-4.4{sub syst.}%.
Published: 2010

44. Higher Moments of Net-proton Multiplicity Distributions at RHIC

Author: M. M. Aggarwal, Z. Ahammed, A. V. Alakhverdyants, I. Alekseev, J. Alford, B. D. Anderson, D. Arkhipkin, G. S. Averichev, J. Balewski, L. S. Barnby, S. Baumgart, D. R. Beavis, R. Bellwied, M. J. Betancourt, R. R. Betts, A. Bhasin, A. K. Bhati, H. Bichsel, J. Bielcik, J. Bielcikova, B. Biritz, L. C. Bland, B. E. Bonner, J. Bouchet, E. Braidot, A. V. Brandin, A. Bridgeman, E. Bruna, S. Bueltmann, I. Bunzarov, T. P. Burton, X. Z. Cai, H. Caines, M. Calderón de la Barca Sánchez, O. Catu, D. Cebra, R. Cendejas, M. C. Cervantes, Z. Chajecki, P. Chaloupka, S. Chattopadhyay, H. F. Chen, J. H. Chen, J. Y. Chen, J. Cheng, M. Cherney, A. Chikanian, K. E. Choi, W. Christie, P. Chung, R. F. Clarke, M. J. M. Codrington, R. Corliss, J. G. Cramer, H. J. Crawford, D. Das, S. Dash, A. Davila Leyva, L. C. De Silva, R. R. Debbe, T. G. Dedovich, A. A. Derevschikov, R. Derradi de Souza, L. Didenko, P. Djawotho, S. M. Dogra, X. Dong, J. L. Drachenberg, J. E. Draper, J. C. Dunlop, M. R. Dutta Mazumdar, L. G. Efimov, E. Elhalhuli, M. Elnimr, J. Engelage, G. Eppley, B. Erazmus, M. Estienne, L. Eun, O. Evdokimov, P. Fachini, R. Fatemi, J. Fedorisin, R. G. Fersch, P. Filip, E. Finch, V. Fine, Y. Fisyak, C. A. Gagliardi, D. R. Gangadharan, M. S. Ganti, E. J. Garcia-Solis, A. Geromitsos, F. Geurts, V. Ghazikhanian, P. Ghosh, Y. N. Gorbunov, A. Gordon, O. Grebenyuk, D. Grosnick, S. M. Guertin, A. Gupta, N. Gupta, W. Guryn, B. Haag, A. Hamed, L-X. Han, J. W. Harris, J. P. Hays-Wehle, M. Heinz, S. Heppelmann, A. Hirsch, E. Hjort, A. M. Hoffman, G. W. Hoffmann, D. J. Hofman, B. Huang, H. Z. Huang, T. J. Humanic, L. Huo, G. Igo, P. Jacobs, W. W. Jacobs, C. Jena, F. Jin, C. L. Jones, P. G. Jones, J. Joseph, E. G. Judd, S. Kabana, K. Kajimoto, K. Kang, J. Kapitan, K. Kauder, D. Keane, A. Kechechyan, D. Kettler, D. P. Kikola, J. Kiryluk, A. Kisiel, S. R. Klein, A. G. Knospe, A. Kocoloski, D. D. Koetke, T. Kollegger, J. Konzer, I. Koralt, L. Koroleva, W. Korsch, L. Kotchenda, V. Kouchpil, P. Kravtsov, K. Krueger, M. Krus, L. Kumar, P. Kurnadi, M. A. C. Lamont, J. M. Landgraf, S. LaPointe, J. Lauret, A. Lebedev, R. Lednicky, C-H. Lee, J. H. Lee, W. Leight, M. J. LeVine, C. Li, L. Li, N. Li, W. Li, X. Li, Y. Li, Z. M. Li, G. Lin, S. J. Lindenbaum, M. A. Lisa, F. Liu, H. Liu, J. Liu, T. Ljubicic, W. J. Llope, R. S. Longacre, W. A. Love, Y. Lu, E. V. Lukashov, X. Luo, G. L. Ma, Y. G. Ma, D. P. Mahapatra, R. Majka, O. I. Mall, L. K. Mangotra, R. Manweiler, S. Margetis, C. Markert, H. Masui, H. S. Matis, Yu. A. Matulenko, D. McDonald, T. S. McShane, A. Meschanin, R. Milner, N. G. Minaev, S. Mioduszewski, A. Mischke, M. K. Mitrovski, B. Mohanty, M. M. Mondal, B. Morozov, D. A. Morozov, M. G. Munhoz, B. K. Nandi, C. Nattrass, T. K. Nayak, J. M. Nelson, P. K. Netrakanti, M. J. Ng, L. V. Nogach, S. B. Nurushev, G. Odyniec, A. Ogawa, V. Okorokov, E. W. Oldag, D. Olson, M. Pachr, B. S. Page, S. K. Pal, Y. Pandit, Y. Panebratsev, T. Pawlak, T. Peitzmann, V. Perevoztchikov, C. Perkins, W. Peryt, S. C. Phatak, P. Pile, M. Planinic, M. A. Ploskon, J. Pluta, D. Plyku, N. Poljak, A. M. Poskanzer, B. V. K. S. Potukuchi, C. B. Powell, D. Prindle, C. Pruneau, N. K. Pruthi, P. R. Pujahari, J. Putschke, H. Qiu, R. Raniwala, S. Raniwala, R. L. Ray, R. Redwine, R. Reed, H. G. Ritter, J. B. Roberts, O. V. Rogachevskiy, J. L. Romero, A. Rose, C. Roy, L. Ruan, R. Sahoo, S. Sakai, I. Sakrejda, T. Sakuma, S. Salur, J. Sandweiss, E. Sangaline, J. Schambach, R. P. Scharenberg, N. Schmitz, T. R. Schuster, J. Seele, J. Seger, I. Selyuzhenkov, P. Seyboth, E. Shahaliev, M. Shao, M. Sharma, S. S. Shi, E. P. Sichtermann, F. Simon, R. N. Singaraju, M. J. Skoby, N. Smirnov, P. Sorensen, J. Sowinski, H. M. Spinka, B. Srivastava, T. D. S. Stanislaus, D. Staszak, J. R. Stevens, R. Stock, M. Strikhanov, B. Stringfellow, A. A. P. Suaide, M. C. Suarez, N. L. Subba, M. Sumbera, X. M. Sun, Y. Sun, Z. Sun, B. Surrow, D. N. Svirida, T. J. M. Symons, A. Szanto de Toledo, J. Takahashi, A. H. Tang, Z. Tang, L. H. Tarini, T. Tarnowsky, D. Thein, J. H. Thomas, J. Tian, A. R. Timmins, S. Timoshenko, D. Tlusty, M. Tokarev, V. N. Tram, S. Trentalange, R. E. Tribble, O. D. Tsai, J. Ulery, T. Ullrich, D. G. Underwood, G. Van Buren, M. van Leeuwen, G. van Nieuwenhuizen, J. A. Vanfossen, R. Varma, G. M. S. Vasconcelos, A. N. Vasiliev, F. Videbaek, Y. P. Viyogi, S. Vokal, S. A. Voloshin, M. Wada, M. Walker, F. Wang, G. Wang, H. Wang, J. S. Wang, Q. Wang, X. L. Wang, Y. Wang, G. Webb, J. C. Webb, G. D. Westfall, C. Whitten, H. Wieman, S. W. Wissink, R. Witt, Y. F. Wu, W. Xie, H. Xu, N. Xu, Q. H. Xu, W. Xu, Y. Xu, Z. Xu, L. Xue, Y. Yang, P. Yepes, K. Yip, I-K. Yoo, Q. Yue, M. Zawisza, H. Zbroszczyk, W. Zhan, J. B. Zhang, S. Zhang, W. M. Zhang, X. P. Zhang, Y. Zhang, Z. P. Zhang, J. Zhao, C. Zhong, J. Zhou, W. Zhou, X. Zhu, Y. H. Zhu, R. Zoulkarneev, Y. Zoulkarneeva, Laboratoire SUBATECH Nantes (SUBATECH), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Nantes (UN)-Mines Nantes (Mines Nantes), and STAR
Subjects: Particle physics, Nuclear Theory, Proton, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Lattice field theory, FOS: Physical sciences, General Physics and Astronomy, dependence lattice field theory energy dependence quantum chromodynamics, measured potential, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], scattering gold p, 01 natural sciences, heavy ion, multiplicity, measured anti-p, chemical multiplicity, moment baryon number, susceptibility correlation, long-range impact parameter, critical phenomena STAR Brookhaven RHIC Coll 19.6, 62.4, 200.0 GeV-cms/nucleon, High Energy Physics - Experiment, Nuclear Theory (nucl-th), Nuclear physics, High Energy Physics - Experiment (hep-ex), High Energy Physics - Lattice, High Energy Physics - Phenomenology (hep-ph), 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Physics, Quantum chromodynamics, 010308 nuclear & particles physics, [PHYS.HLAT]Physics [physics]/High Energy Physics - Lattice [hep-lat], High Energy Physics - Lattice (hep-lat), Sigma, Multiplicity (mathematics), Lattice QCD, NATURAL SCIENCES. Physics, Baryon, PRIRODNE ZNANOSTI. Fizika, High Energy Physics - Phenomenology, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], Baryon number
Abstract: We report the first measurements of the kurtosis (\kappa), skewness (S) and variance (\sigma^2) of net-proton multiplicity (N_p - N_pbar) distributions at midrapidity for Au+Au collisions at \sqrt(s_NN) = 19.6, 62.4, and 200 GeV corresponding to baryon chemical potentials (\mu_B) between 200 - 20 MeV. Our measurements of the products \kappa \sigma^2 and S \sigma, which can be related to theoretical calculations sensitive to baryon number susceptibilities and long range correlations, are constant as functions of collision centrality. We compare these products with results from lattice QCD and various models without a critical point and study the \sqrt(s_NN) dependence of \kappa \sigma^2. From the measurements at the three beam energies, we find no evidence for a critical point in the QCD phase diagram for \mu_B below 200 MeV., Comment: 6 pages and 4 figures. Version accepted for publication in Physical Review Letters
Published: 2010

45. Three-Particle Coincidence of the Long Range Pseudorapidity Correlation in High Energy Nucleus-Nucleus Collisions

Author: B. I. Abelev, M. M. Aggarwal, Z. Ahammed, A. V. Alakhverdyants, B. D. Anderson, D. Arkhipkin, G. S. Averichev, J. Balewski, O. Barannikova, L. S. Barnby, S. Baumgart, D. R. Beavis, R. Bellwied, M. J. Betancourt, R. R. Betts, A. Bhasin, A. K. Bhati, H. Bichsel, J. Bielcik, J. Bielcikova, B. Biritz, L. C. Bland, I. Bnzarov, B. E. Bonner, J. Bouchet, E. Braidot, A. V. Brandin, A. Bridgeman, E. Bruna, S. Bueltmann, T. P. Burton, X. Z. Cai, H. Caines, M. Calderón de la Barca Sánchez, O. Catu, D. Cebra, R. Cendejas, M. C. Cervantes, Z. Chajecki, P. Chaloupka, S. Chattopadhyay, H. F. Chen, J. H. Chen, J. Y. Chen, J. Cheng, M. Cherney, A. Chikanian, K. E. Choi, W. Christie, P. Chung, R. F. Clarke, M. J. M. Codrington, R. Corliss, J. G. Cramer, H. J. Crawford, D. Das, S. Dash, A. Davila Leyva, L. C. De Silva, R. R. Debbe, T. G. Dedovich, M. DePhillips, A. A. Derevschikov, R. Derradi de Souza, L. Didenko, P. Djawotho, S. M. Dogra, X. Dong, J. L. Drachenberg, J. E. Draper, J. C. Dunlop, M. R. Dutta Mazumdar, L. G. Efimov, E. Elhalhuli, M. Elnimr, J. Engelage, G. Eppley, B. Erazmus, M. Estienne, L. Eun, P. Fachini, R. Fatemi, J. Fedorisin, R. G. Fersch, P. Filip, E. Finch, V. Fine, Y. Fisyak, C. A. Gagliardi, D. R. Gangadharan, M. S. Ganti, E. J. Garcia-Solis, A. Geromitsos, F. Geurts, V. Ghazikhanian, P. Ghosh, Y. N. Gorbunov, A. Gordon, O. Grebenyuk, D. Grosnick, B. Grube, S. M. Guertin, A. Gupta, N. Gupta, W. Guryn, B. Haag, T. J. Hallman, A. Hamed, L-X. Han, J. W. Harris, J. P. Hays-Wehle, M. Heinz, S. Heppelmann, A. Hirsch, E. Hjort, A. M. Hoffman, G. W. Hoffmann, D. J. Hofman, R. S. Hollis, H. Z. Huang, T. J. Humanic, L. Huo, G. Igo, A. Iordanova, P. Jacobs, W. W. Jacobs, P. Jakl, C. Jena, F. Jin, C. L. Jones, P. G. Jones, J. Joseph, E. G. Judd, S. Kabana, K. Kajimoto, K. Kang, J. Kapitan, K. Kauder, D. Keane, A. Kechechyan, D. Kettler, V. Yu. Khodyrev, D. P. Kikola, J. Kiryluk, A. Kisiel, A. G. Knospe, A. Kocoloski, D. D. Koetke, T. Kollegger, J. Konzer, M. Kopytine, I. Koralt, W. Korsch, L. Kotchenda, V. Kouchpil, P. Kravtsov, V. I. Kravtsov, K. Krueger, M. Krus, L. Kumar, P. Kurnadi, M. A. C. Lamont, J. M. Landgraf, S. LaPointe, J. Lauret, A. Lebedev, R. Lednicky, C-H. Lee, J. H. Lee, W. Leight, M. J. LeVine, C. Li, L. Li, N. Li, W. Li, X. Li, Y. Li, Z. Li, G. Lin, S. J. Lindenbaum, M. A. Lisa, F. Liu, H. Liu, J. Liu, T. Ljubicic, W. J. Llope, R. S. Longacre, W. A. Love, Y. Lu, T. Ludlam, G. L. Ma, Y. G. Ma, D. P. Mahapatra, R. Majka, O. I. Mall, L. K. Mangotra, R. Manweiler, S. Margetis, C. Markert, H. Masui, H. S. Matis, Yu. A. Matulenko, D. McDonald, T. S. McShane, A. Meschanin, R. Milner, N. G. Minaev, S. Mioduszewski, A. Mischke, M. K. Mitrovski, B. Mohanty, D. A. Morozov, M. G. Munhoz, B. K. Nandi, C. Nattrass, T. K. Nayak, J. M. Nelson, P. K. Netrakanti, M. J. Ng, L. V. Nogach, S. B. Nurushev, G. Odyniec, A. Ogawa, H. Okada, V. Okorokov, D. Olson, M. Pachr, B. S. Page, S. K. Pal, Y. Pandit, Y. Panebratsev, T. Pawlak, T. Peitzmann, V. Perevoztchikov, C. Perkins, W. Peryt, S. C. Phatak, P. Pile, M. Planinic, M. A. Ploskon, J. Pluta, D. Plyku, N. Poljak, A. M. Poskanzer, B. V. K. S. Potukuchi, C. B. Powell, D. Prindle, C. Pruneau, N. K. Pruthi, P. R. Pujahari, J. Putschke, R. Raniwala, S. Raniwala, R. L. Ray, R. Redwine, R. Reed, J. M. Rehberg, H. G. Ritter, J. B. Roberts, O. V. Rogachevskiy, J. L. Romero, A. Rose, C. Roy, L. Ruan, R. Sahoo, S. Sakai, I. Sakrejda, T. Sakuma, S. Salur, J. Sandweiss, E. Sangaline, J. Schambach, R. P. Scharenberg, N. Schmitz, T. R. Schuster, J. Seele, J. Seger, I. Selyuzhenkov, P. Seyboth, E. Shahaliev, M. Shao, M. Sharma, S. S. Shi, E. P. Sichtermann, F. Simon, R. N. Singaraju, M. J. Skoby, N. Smirnov, P. Sorensen, J. Sowinski, H. M. Spinka, B. Srivastava, T. D. S. Stanislaus, D. Staszak, J. R. Stevens, R. Stock, M. Strikhanov, B. Stringfellow, A. A. P. Suaide, M. C. Suarez, N. L. Subba, M. Sumbera, X. M. Sun, Y. Sun, Z. Sun, B. Surrow, T. J. M. Symons, A. Szanto de Toledo, J. Takahashi, A. H. Tang, Z. Tang, L. H. Tarini, T. Tarnowsky, D. Thein, J. H. Thomas, J. Tian, A. R. Timmins, S. Timoshenko, D. Tlusty, M. Tokarev, V. N. Tram, S. Trentalange, R. E. Tribble, O. D. Tsai, J. Ulery, T. Ullrich, D. G. Underwood, G. Van Buren, G. van Nieuwenhuizen, M. van Leeuwen, J. A. Vanfossen, R. Varma, G. M. S. Vasconcelos, A. N. Vasiliev, F. Videbæk, Y. P. Viyogi, S. Vokal, M. Wada, M. Walker, F. Wang, G. Wang, H. Wang, J. S. Wang, Q. Wang, X. Wang, X. L. Wang, Y. Wang, G. Webb, J. C. Webb, G. D. Westfall, C. Whitten, H. Wieman, E. Wingfield, S. W. Wissink, R. Witt, Y. Wu, W. Xie, N. Xu, Q. H. Xu, W. Xu, Y. Xu, Z. Xu, L. Xue, Y. Yang, P. Yepes, K. Yip, I-K. Yoo, Q. Yue, M. Zawisza, H. Zbroszczyk, W. Zhan, S. Zhang, W. M. Zhang, X. P. Zhang, Y. Zhang, Z. P. Zhang, J. Zhao, C. Zhong, J. Zhou, W. Zhou, X. Zhu, Y-H. Zhu, R. Zoulkarneev, Y. Zoulkarneeva, Laboratoire SUBATECH Nantes (SUBATECH), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Nantes (UN)-Mines Nantes (Mines Nantes), and STAR
Subjects: Nuclear Theory, General Physics and Astronomy, FOS: Physical sciences, 01 natural sciences, Coincidence, deuteron gold transverse momentum, High Energy Physics - Experiment, Nuclear physics, Nuclear Theory (nucl-th), Charge ordering, High Energy Physics - Experiment (hep-ex), (3particle) impact parameter, High Energy Physics - Phenomenology (hep-ph), trigger heavy ion, scattering correlation, long-range rapidity, correlation correlation, dependence STAR Brookhaven RHIC Coll 200 GeV-cms/nucleon, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Physics, Range (particle radiation), 010308 nuclear & particles physics, Ridge (differential geometry), NATURAL SCIENCES. Physics, PRIRODNE ZNANOSTI. Fizika, High Energy Physics - Phenomenology, Deuterium, Pseudorapidity, Physics::Space Physics, Particle, High Energy Physics::Experiment, Atomic physics, Event (particle physics)
Abstract: We report the first three-particle coincidence measurement in pseudorapidity ($\Delta\eta$) between a high transverse momentum ($p_{\perp}$) trigger particle and two lower $p_{\perp}$ associated particles within azimuth $\mid$$\Delta\phi$$\mid$$, Comment: 7 pages, 4 figures
Published: 2010

46. Longitudinal double-spin asymmetry and cross section for inclusive neutral pion production at midrapidity in polarized proton collisions ats=200 GeV

Author: B. I. Abelev, M. M. Aggarwal, Z. Ahammed, A. V. Alakhverdyants, B. D. Anderson, D. Arkhipkin, G. S. Averichev, J. Balewski, O. Barannikova, L. S. Barnby, S. Baumgart, D. R. Beavis, R. Bellwied, F. Benedosso, M. J. Betancourt, R. R. Betts, A. Bhasin, A. K. Bhati, H. Bichsel, J. Bielcik, J. Bielcikova, B. Biritz, L. C. Bland, B. E. Bonner, J. Bouchet, E. Braidot, A. V. Brandin, A. Bridgeman, E. Bruna, S. Bueltmann, I. Bunzarov, T. P. Burton, X. Z. Cai, H. Caines, M. Calderón de la Barca Sánchez, O. Catu, D. Cebra, R. Cendejas, M. C. Cervantes, Z. Chajecki, P. Chaloupka, S. Chattopadhyay, H. F. Chen, J. H. Chen, J. Y. Chen, J. Cheng, M. Cherney, A. Chikanian, K. E. Choi, W. Christie, P. Chung, R. F. Clarke, M. J. M. Codrington, R. Corliss, J. G. Cramer, H. J. Crawford, D. Das, S. Dash, A. Davila Leyva, L. C. De Silva, R. R. Debbe, T. G. Dedovich, M. DePhillips, A. A. Derevschikov, R. Derradi de Souza, L. Didenko, P. Djawotho, S. M. Dogra, X. Dong, J. L. Drachenberg, J. E. Draper, J. C. Dunlop, M. R. Dutta Mazumdar, L. G. Efimov, E. Elhalhuli, M. Elnimr, J. Engelage, G. Eppley, B. Erazmus, M. Estienne, L. Eun, P. Fachini, R. Fatemi, J. Fedorisin, R. G. Fersch, P. Filip, E. Finch, V. Fine, Y. Fisyak, C. A. Gagliardi, D. R. Gangadharan, M. S. Ganti, E. J. Garcia-Solis, A. Geromitsos, F. Geurts, V. Ghazikhanian, P. Ghosh, Y. N. Gorbunov, A. Gordon, O. Grebenyuk, D. Grosnick, B. Grube, S. M. Guertin, A. Gupta, N. Gupta, W. Guryn, B. Haag, T. J. Hallman, A. Hamed, L.-X. Han, J. W. Harris, J. P. Hays-Wehle, M. Heinz, S. Heppelmann, A. Hirsch, E. Hjort, A. M. Hoffman, G. W. Hoffmann, D. J. Hofman, R. S. Hollis, H. Z. Huang, T. J. Humanic, L. Huo, G. Igo, A. Iordanova, P. Jacobs, W. W. Jacobs, P. Jakl, C. Jena, F. Jin, C. L. Jones, P. G. Jones, J. Joseph, E. G. Judd, S. Kabana, K. Kajimoto, K. Kang, J. Kapitan, K. Kauder, D. Keane, A. Kechechyan, D. Kettler, D. P. Kikola, J. Kiryluk, A. Kisiel, S. R. Klein, A. G. Knospe, A. Kocoloski, D. D. Koetke, T. Kollegger, J. Konzer, M. Kopytine, I. Koralt, W. Korsch, L. Kotchenda, V. Kouchpil, P. Kravtsov, K. Krueger, M. Krus, L. Kumar, P. Kurnadi, M. A. C. Lamont, J. M. Landgraf, S. LaPointe, J. Lauret, A. Lebedev, R. Lednicky, C.-H. Lee, J. H. Lee, W. Leight, M. J. LeVine, C. Li, L. Li, N. Li, W. Li, X. Li, Y. Li, Z. Li, G. Lin, S. J. Lindenbaum, M. A. Lisa, F. Liu, H. Liu, J. Liu, T. Ljubicic, W. J. Llope, R. S. Longacre, W. A. Love, Y. Lu, G. L. Ma, Y. G. Ma, D. P. Mahapatra, R. Majka, O. I. Mall, L. K. Mangotra, R. Manweiler, S. Margetis, C. Markert, H. Masui, H. S. Matis, Yu. A. Matulenko, D. McDonald, T. S. McShane, A. Meschanin, R. Milner, N. G. Minaev, S. Mioduszewski, A. Mischke, M. K. Mitrovski, B. Mohanty, M. M. Mondal, D. A. Morozov, M. G. Munhoz, B. K. Nandi, C. Nattrass, T. K. Nayak, J. M. Nelson, P. K. Netrakanti, M. J. Ng, L. V. Nogach, S. B. Nurushev, G. Odyniec, A. Ogawa, H. Okada, V. Okorokov, D. Olson, M. Pachr, B. S. Page, S. K. Pal, Y. Pandit, Y. Panebratsev, T. Pawlak, T. Peitzmann, V. Perevoztchikov, C. Perkins, W. Peryt, S. C. Phatak, P. Pile, M. Planinic, M. A. Ploskon, J. Pluta, D. Plyku, N. Poljak, A. M. Poskanzer, B. V. K. S. Potukuchi, C. B. Powell, D. Prindle, C. Pruneau, N. K. Pruthi, P. R. Pujahari, J. Putschke, R. Raniwala, S. Raniwala, R. L. Ray, R. Redwine, R. Reed, J. M. Rehberg, H. G. Ritter, J. B. Roberts, O. V. Rogachevskiy, J. L. Romero, A. Rose, C. Roy, L. Ruan, M. J. Russcher, R. Sahoo, S. Sakai, I. Sakrejda, T. Sakuma, S. Salur, J. Sandweiss, E. Sangaline, J. Schambach, R. P. Scharenberg, N. Schmitz, T. R. Schuster, J. Seele, J. Seger, I. Selyuzhenkov, P. Seyboth, E. Shahaliev, M. Shao, M. Sharma, S. S. Shi, E. P. Sichtermann, F. Simon, R. N. Singaraju, M. J. Skoby, N. Smirnov, P. Sorensen, J. Sowinski, H. M. Spinka, B. Srivastava, T. D. S. Stanislaus, D. Staszak, J. R. Stevens, R. Stock, M. Strikhanov, B. Stringfellow, A. A. P. Suaide, M. C. Suarez, N. L. Subba, M. Sumbera, X. M. Sun, Y. Sun, Z. Sun, B. Surrow, T. J. M. Symons, A. Szanto de Toledo, J. Takahashi, A. H. Tang, Z. Tang, L. H. Tarini, T. Tarnowsky, D. Thein, J. H. Thomas, J. Tian, A. R. Timmins, S. Timoshenko, D. Tlusty, M. Tokarev, T. A. Trainor, V. N. Tram, S. Trentalange, R. E. Tribble, O. D. Tsai, J. Ulery, T. Ullrich, D. G. Underwood, G. Van Buren, G. van Nieuwenhuizen, J. A. Vanfossen, R. Varma, G. M. S. Vasconcelos, A. N. Vasiliev, F. Videbaek, Y. P. Viyogi, S. Vokal, S. A. Voloshin, M. Wada, M. Walker, F. Wang, G. Wang, H. Wang, J. S. Wang, Q. Wang, X. Wang, X. L. Wang, Y. Wang, G. Webb, J. C. Webb, G. D. Westfall, C. Whitten, H. Wieman, E. Wingfield, S. W. Wissink, R. Witt, Y. Wu, W. Xie, N. Xu, Q. H. Xu, W. Xu, Y. Xu, Z. Xu, L. Xue, Y. Yang, P. Yepes, K. Yip, I-K. Yoo, Q. Yue, M. Zawisza, H. Zbroszczyk, W. Zhan, S. Zhang, W. M. Zhang, X. P. Zhang, Y. Zhang, Z. P. Zhang, J. Zhao, C. Zhong, J. Zhou, W. Zhou, X. Zhu, Y. H. Zhu, R. Zoulkarneev, and Y. Zoulkarneeva
Subjects: Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Proton, 010308 nuclear & particles physics, media_common.quotation_subject, Hadron, Perturbative QCD, 01 natural sciences, 7. Clean energy, Asymmetry, Gluon, Nuclear physics, Pion, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Nucleon, media_common
Abstract: We report a measurement of the longitudinal double-spin asymmetry ALL and the differential cross section for inclusive π0 production at midrapidity in polarized proton collisions at √s=200 GeV. The cross section was measured over a transverse momentum range of 1
Published: 2009

47. Growth of Long Range Forward-Backward Multiplicity Correlations with Centrality inAu+AuCollisions atsNN=200 GeV

Author: B. I. Abelev, M. M. Aggarwal, Z. Ahammed, B. D. Anderson, D. Arkhipkin, G. S. Averichev, J. Balewski, O. Barannikova, L. S. Barnby, J. Baudot, S. Baumgart, D. R. Beavis, R. Bellwied, F. Benedosso, M. J. Betancourt, R. R. Betts, A. Bhasin, A. K. Bhati, H. Bichsel, J. Bielcik, J. Bielcikova, B. Biritz, L. C. Bland, M. Bombara, B. E. Bonner, M. Botje, J. Bouchet, E. Braidot, A. V. Brandin, E. Bruna, S. Bueltmann, T. P. Burton, M. Bystersky, X. Z. Cai, H. Caines, M. Calderón de la Barca Sánchez, O. Catu, D. Cebra, R. Cendejas, M. C. Cervantes, Z. Chajecki, P. Chaloupka, S. Chattopadhyay, H. F. Chen, J. H. Chen, J. Y. Chen, J. Cheng, M. Cherney, A. Chikanian, K. E. Choi, W. Christie, R. F. Clarke, M. J. M. Codrington, R. Corliss, T. M. Cormier, M. R. Cosentino, J. G. Cramer, H. J. Crawford, D. Das, S. Dash, M. Daugherity, L. C. De Silva, T. G. Dedovich, M. DePhillips, A. A. Derevschikov, R. Derradi de Souza, L. Didenko, P. Djawotho, S. M. Dogra, X. Dong, J. L. Drachenberg, J. E. Draper, F. Du, J. C. Dunlop, M. R. Dutta Mazumdar, W. R. Edwards, L. G. Efimov, E. Elhalhuli, M. Elnimr, V. Emelianov, J. Engelage, G. Eppley, B. Erazmus, M. Estienne, L. Eun, P. Fachini, R. Fatemi, J. Fedorisin, A. Feng, P. Filip, E. Finch, V. Fine, Y. Fisyak, C. A. Gagliardi, L. Gaillard, D. R. Gangadharan, M. S. Ganti, E. J. Garcia-Solis, A. Geromitsos, F. Geurts, V. Ghazikhanian, P. Ghosh, Y. N. Gorbunov, A. Gordon, O. Grebenyuk, D. Grosnick, B. Grube, S. M. Guertin, K. S. F. F. Guimaraes, A. Gupta, N. Gupta, W. Guryn, B. Haag, T. J. Hallman, A. Hamed, J. W. Harris, W. He, M. Heinz, S. Heppelmann, B. Hippolyte, A. Hirsch, E. Hjort, A. M. Hoffman, G. W. Hoffmann, D. J. Hofman, R. S. Hollis, H. Z. Huang, T. J. Humanic, L. Huo, G. Igo, A. Iordanova, P. Jacobs, W. W. Jacobs, P. Jakl, C. Jena, F. Jin, C. L. Jones, P. G. Jones, J. Joseph, E. G. Judd, S. Kabana, K. Kajimoto, K. Kang, J. Kapitan, D. Keane, A. Kechechyan, D. Kettler, V. Yu. Khodyrev, D. P. Kikola, J. Kiryluk, A. Kisiel, A. G. Knospe, A. Kocoloski, D. D. Koetke, M. Kopytine, W. Korsch, L. Kotchenda, V. Kouchpil, P. Kravtsov, V. I. Kravtsov, K. Krueger, M. Krus, C. Kuhn, L. Kumar, P. Kurnadi, M. A. C. Lamont, J. M. Landgraf, S. LaPointe, J. Lauret, A. Lebedev, R. Lednicky, C-H. Lee, J. H. Lee, W. Leight, M. J. LeVine, N. Li, C. Li, Y. Li, G. Lin, S. J. Lindenbaum, M. A. Lisa, F. Liu, J. Liu, L. Liu, T. Ljubicic, W. J. Llope, R. S. Longacre, W. A. Love, Y. Lu, T. Ludlam, G. L. Ma, Y. G. Ma, D. P. Mahapatra, R. Majka, O. I. Mall, L. K. Mangotra, R. Manweiler, S. Margetis, C. Markert, H. S. Matis, Yu. A. Matulenko, T. S. McShane, A. Meschanin, R. Milner, N. G. Minaev, S. Mioduszewski, A. Mischke, J. Mitchell, B. Mohanty, D. A. Morozov, M. G. Munhoz, B. K. Nandi, C. Nattrass, T. K. Nayak, J. M. Nelson, P. K. Netrakanti, M. J. Ng, L. V. Nogach, S. B. Nurushev, G. Odyniec, A. Ogawa, H. Okada, V. Okorokov, D. Olson, M. Pachr, B. S. Page, S. K. Pal, Y. Pandit, Y. Panebratsev, T. Pawlak, T. Peitzmann, V. Perevoztchikov, C. Perkins, W. Peryt, S. C. Phatak, M. Planinic, J. Pluta, N. Poljak, A. M. Poskanzer, B. V. K. S. Potukuchi, D. Prindle, C. Pruneau, N. K. Pruthi, P. R. Pujahari, J. Putschke, R. Raniwala, S. Raniwala, R. Redwine, R. Reed, A. Ridiger, H. G. Ritter, J. B. Roberts, O. V. Rogachevskiy, J. L. Romero, A. Rose, C. Roy, L. Ruan, M. J. Russcher, R. Sahoo, I. Sakrejda, T. Sakuma, S. Salur, J. Sandweiss, M. Sarsour, J. Schambach, R. P. Scharenberg, N. Schmitz, J. Seger, I. Selyuzhenkov, P. Seyboth, A. Shabetai, E. Shahaliev, M. Shao, M. Sharma, S. S. Shi, X-H. Shi, E. P. Sichtermann, F. Simon, R. N. Singaraju, M. J. Skoby, N. Smirnov, R. Snellings, P. Sorensen, J. Sowinski, H. M. Spinka, B. Srivastava, A. Stadnik, T. D. S. Stanislaus, D. Staszak, M. Strikhanov, B. Stringfellow, A. A. P. Suaide, M. C. Suarez, N. L. Subba, M. Sumbera, X. M. Sun, Y. Sun, Z. Sun, B. Surrow, T. J. M. Symons, A. Szanto de Toledo, J. Takahashi, A. H. Tang, Z. Tang, T. Tarnowsky, D. Thein, J. H. Thomas, J. Tian, A. R. Timmins, S. Timoshenko, D. Tlusty, M. Tokarev, V. N. Tram, A. L. Trattner, S. Trentalange, R. E. Tribble, O. D. Tsai, J. Ulery, T. Ullrich, D. G. Underwood, G. Van Buren, M. van Leeuwen, A. M. Vander Molen, J. A. Vanfossen, R. Varma, G. M. S. Vasconcelos, I. M. Vasilevski, A. N. Vasiliev, F. Videbaek, S. E. Vigdor, Y. P. Viyogi, S. Vokal, S. A. Voloshin, M. Wada, M. Walker, F. Wang, G. Wang, J. S. Wang, Q. Wang, X. Wang, X. L. Wang, Y. Wang, G. Webb, J. C. Webb, G. D. Westfall, C. Whitten, H. Wieman, S. W. Wissink, R. Witt, Y. Wu, W. Xie, N. Xu, Q. H. Xu, Y. Xu, Z. Xu, Y. Yang, P. Yepes, I-K. Yoo, Q. Yue, M. Zawisza, H. Zbroszczyk, W. Zhan, S. Zhang, W. M. Zhang, X. P. Zhang, Y. Zhang, Z. P. Zhang, Y. Zhao, C. Zhong, J. Zhou, R. Zoulkarneev, Y. Zoulkarneeva, and J. X. Zuo
Subjects: Physics, Range (particle radiation), 010308 nuclear & particles physics, General Physics and Astronomy, Multiplicity (mathematics), Forward backward, Parton, 01 natural sciences, Color-glass condensate, Nuclear physics, 0103 physical sciences, Nuclear Experiment, 010306 general physics, Centrality, STAR detector
Abstract: Forward-backward multiplicity correlation strengths have been measured for the first time with the STAR detector for Au+Au and $\textit{p+p}$ collisions at $\sqrt{s_{NN}}$ = 200 GeV. Strong short and long range correlations are seen in central (0-10%) Au+Au collisions. The magnitude of these correlations decrease with decreasing centrality until only short range correlations are observed in 40-50% Au+Au collisions. The results are in agreement with predictions from the Dual Parton and Color Glass Condensate models.
Published: 2009

48. Measurements ofϕmeson production in relativistic heavy-ion collisions at the BNL Relativistic Heavy Ion Collider (RHIC)

Author: B. I. Abelev, M. M. Aggarwal, Z. Ahammed, B. D. Anderson, D. Arkhipkin, G. S. Averichev, Y. Bai, J. Balewski, O. Barannikova, L. S. Barnby, J. Baudot, S. Baumgart, D. R. Beavis, R. Bellwied, F. Benedosso, R. R. Betts, S. Bhardwaj, A. Bhasin, A. K. Bhati, H. Bichsel, J. Bielcik, J. Bielcikova, B. Biritz, L. C. Bland, S. -L. Blyth, M. Bombara, B. E. Bonner, M. Botje, J. Bouchet, E. Braidot, A. V. Brandin, E. Bruna, S. Bueltmann, T. P. Burton, M. Bystersky, X. Z. Cai, H. Caines, M. Calderón de la Barca Sánchez, J. Callner, O. Catu, D. Cebra, R. Cendejas, M. C. Cervantes, Z. Chajecki, P. Chaloupka, S. Chattopadhyay, H. F. Chen, J. H. Chen, J. Y. Chen, J. Cheng, M. Cherney, A. Chikanian, K. E. Choi, W. Christie, S. U. Chung, R. F. Clarke, M. J. M. Codrington, J. P. Coffin, T. M. Cormier, M. R. Cosentino, J. G. Cramer, H. J. Crawford, D. Das, S. Dash, M. Daugherity, C. De Silva, T. G. Dedovich, M. DePhillips, A. A. Derevschikov, R. Derradi de Souza, L. Didenko, P. Djawotho, S. M. Dogra, X. Dong, J. L. Drachenberg, J. E. Draper, F. Du, J. C. Dunlop, M. R. Dutta Mazumdar, W. R. Edwards, L. G. Efimov, E. Elhalhuli, M. Elnimr, V. Emelianov, J. Engelage, G. Eppley, B. Erazmus, M. Estienne, L. Eun, P. Fachini, R. Fatemi, J. Fedorisin, A. Feng, P. Filip, E. Finch, V. Fine, Y. Fisyak, C. A. Gagliardi, L. Gaillard, D. R. Gangadharan, M. S. Ganti, E. Garcia-Solis, V. Ghazikhanian, P. Ghosh, Y. N. Gorbunov, A. Gordon, O. Grebenyuk, D. Grosnick, B. Grube, S. M. Guertin, K. S. F. F. Guimaraes, A. Gupta, N. Gupta, W. Guryn, B. Haag, T. J. Hallman, A. Hamed, J. W. Harris, W. He, M. Heinz, S. Heppelmann, B. Hippolyte, A. Hirsch, A. M. Hoffman, G. W. Hoffmann, D. J. Hofman, R. S. Hollis, H. Z. Huang, T. J. Humanic, G. Igo, A. Iordanova, P. Jacobs, W. W. Jacobs, P. Jakl, F. Jin, P. G. Jones, J. Joseph, E. G. Judd, S. Kabana, K. Kajimoto, K. Kang, J. Kapitan, M. Kaplan, D. Keane, A. Kechechyan, D. Kettler, V. Yu. Khodyrev, J. Kiryluk, A. Kisiel, S. R. Klein, A. G. Knospe, A. Kocoloski, D. D. Koetke, M. Kopytine, L. Kotchenda, V. Kouchpil, P. Kravtsov, V. I. Kravtsov, K. Krueger, M. Krus, C. Kuhn, L. Kumar, P. Kurnadi, M. A. C. Lamont, J. M. Landgraf, S. LaPointe, J. Lauret, A. Lebedev, R. Lednicky, C. -H. Lee, M. J. LeVine, C. Li, Y. Li, G. Lin, X. Lin, S. J. Lindenbaum, M. A. Lisa, F. Liu, H. Liu, J. Liu, L. Liu, T. Ljubicic, W. J. Llope, R. S. Longacre, W. A. Love, Y. Lu, T. Ludlam, D. Lynn, G. L. Ma, J. G. Ma, Y. G. Ma, D. P. Mahapatra, R. Majka, M. I. Mall, L. K. Mangotra, R. Manweiler, S. Margetis, C. Markert, H. S. Matis, Yu. A. Matulenko, T. S. McShane, A. Meschanin, J. Millane, M. L. Miller, N. G. Minaev, S. Mioduszewski, A. Mischke, J. Mitchell, B. Mohanty, D. A. Morozov, M. G. Munhoz, B. K. Nandi, C. Nattrass, T. K. Nayak, J. M. Nelson, C. Nepali, P. K. Netrakanti, M. J. Ng, L. V. Nogach, S. B. Nurushev, G. Odyniec, A. Ogawa, H. Okada, V. Okorokov, D. Olson, M. Pachr, B. S. Page, S. K. Pal, Y. Pandit, Y. Panebratsev, T. Pawlak, T. Peitzmann, V. Perevoztchikov, C. Perkins, W. Peryt, S. C. Phatak, M. Planinic, J. Pluta, N. Poljak, A. M. Poskanzer, B. V. K. S. Potukuchi, D. Prindle, C. Pruneau, N. K. Pruthi, J. Putschke, R. Raniwala, S. Raniwala, R. L. Ray, R. Reed, A. Ridiger, H. G. Ritter, J. B. Roberts, O. V. Rogachevskiy, J. L. Romero, A. Rose, C. Roy, L. Ruan, M. J. Russcher, V. Rykov, R. Sahoo, I. Sakrejda, T. Sakuma, S. Salur, J. Sandweiss, M. Sarsour, J. Schambach, R. P. Scharenberg, N. Schmitz, J. Seger, I. Selyuzhenkov, P. Seyboth, A. Shabetai, E. Shahaliev, M. Shao, M. Sharma, S. S. Shi, X. -H. Shi, E. P. Sichtermann, F. Simon, R. N. Singaraju, M. J. Skoby, N. Smirnov, R. Snellings, P. Sorensen, J. Sowinski, H. M. Spinka, B. Srivastava, A. Stadnik, T. D. S. Stanislaus, D. Staszak, M. Strikhanov, B. Stringfellow, A. A. P. Suaide, M. C. Suarez, N. L. Subba, M. Sumbera, X. M. Sun, Y. Sun, Z. Sun, B. Surrow, T. J. M. Symons, A. Szanto de Toledo, J. Takahashi, A. H. Tang, Z. Tang, T. Tarnowsky, D. Thein, J. H. Thomas, J. Tian, A. R. Timmins, S. Timoshenko, null Tlusty, M. Tokarev, T. A. Trainor, V. N. Tram, A. L. Trattner, S. Trentalange, R. E. Tribble, O. D. Tsai, J. Ulery, T. Ullrich, D. G. Underwood, G. Van Buren, M. van Leeuwen, A. M. Vander Molen, J. A. Vanfossen, R. Varma, G. M. S. Vasconcelos, I. M. Vasilevski, A. N. Vasiliev, F. Videbaek, S. E. Vigdor, Y. P. Viyogi, S. Vokal, S. A. Voloshin, M. Wada, W. T. Waggoner, F. Wang, G. Wang, J. S. Wang, Q. Wang, X. Wang, X. L. Wang, Y. Wang, J. C. Webb, G. D. Westfall, C. Whitten, H. Wieman, S. W. Wissink, R. Witt, Y. Wu, N. Xu, Q. H. Xu, Y. Xu, Z. Xu, P. Yepes, I. -K. Yoo, Q. Yue, M. Zawisza, H. Zbroszczyk, W. Zhan, H. Zhang, S. Zhang, W. M. Zhang, Y. Zhang, Z. P. Zhang, Y. Zhao, C. Zhong, J. Zhou, R. Zoulkarneev, Y. Zoulkarneeva, J. X. Zuo, Département Recherches Subatomiques (DRS-IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Laboratoire SUBATECH Nantes (SUBATECH), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Nantes (UN)-Mines Nantes (Mines Nantes), and Mines Nantes (Mines Nantes)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Quark, Nuclear and High Energy Physics, Particle physics, Meson, 010308 nuclear & particles physics, Nuclear Theory, Hadron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Phi meson, 01 natural sciences, 7. Clean energy, Hadronization, Pion, 25.75.Dw, 0103 physical sciences, High Energy Physics::Experiment, Production (computer science), Nuclear Experiment, 010306 general physics, Relativistic Heavy Ion Collider
Abstract: We present results for the measurement of $\phi$ meson production via its charged kaon decay channel $\phi \to K^+K^-$ in Au+Au collisions at $\sqrt{s_{_{NN}}}=62.4$, 130, and 200 GeV, and in $p+p$ and $d$+Au collisions at $\sqrt{s_{_{NN}}}=200$ GeV from the STAR experiment at the BNL Relativistic Heavy Ion Collider (RHIC). The midrapidity ($|y
Published: 2009

49. ρ0photoproduction in ultraperipheral relativistic heavy ion collisions atsNN=200GeV

Author: B. I. Abelev, M. M. Aggarwal, Z. Ahammed, B. D. Anderson, D. Arkhipkin, G. S. Averichev, Y. Bai, J. Balewski, O. Barannikova, L. S. Barnby, J. Baudot, S. Baumgart, D. R. Beavis, R. Bellwied, F. Benedosso, R. R. Betts, S. Bhardwaj, A. Bhasin, A. K. Bhati, H. Bichsel, J. Bielcik, J. Bielcikova, L. C. Bland, S.-L. Blyth, M. Bombara, B. E. Bonner, M. Botje, J. Bouchet, E. Braidot, A. V. Brandin, S. Bueltmann, T. P. Burton, M. Bystersky, X. Z. Cai, H. Caines, M. Calderón de la Barca Sánchez, J. Callner, O. Catu, D. Cebra, M. C. Cervantes, Z. Chajecki, P. Chaloupka, S. Chattopadhyay, H. F. Chen, J. H. Chen, J. Y. Chen, J. Cheng, M. Cherney, A. Chikanian, K. E. Choi, W. Christie, S. U. Chung, R. F. Clarke, M. J. M. Codrington, J. P. Coffin, T. M. Cormier, M. R. Cosentino, J. G. Cramer, H. J. Crawford, D. Das, S. Dash, M. Daugherity, M. M. de Moura, T. G. Dedovich, M. DePhillips, A. A. Derevschikov, R. Derradi de Souza, L. Didenko, T. Dietel, P. Djawotho, S. M. Dogra, X. Dong, J. L. Drachenberg, J. E. Draper, F. Du, J. C. Dunlop, M. R. Dutta Mazumdar, W. R. Edwards, L. G. Efimov, E. Elhalhuli, V. Emelianov, J. Engelage, G. Eppley, B. Erazmus, M. Estienne, L. Eun, P. Fachini, R. Fatemi, J. Fedorisin, A. Feng, P. Filip, E. Finch, V. Fine, Y. Fisyak, J. Fu, C. A. Gagliardi, L. Gaillard, M. S. Ganti, E. Garcia-Solis, V. Ghazikhanian, P. Ghosh, Y. N. Gorbunov, A. Gordon, O. Grebenyuk, D. Grosnick, B. Grube, S. M. Guertin, K. S. F. F. Guimaraes, A. Gupta, N. Gupta, W. Guryn, B. Haag, T. J. Hallman, A. Hamed, J. W. Harris, W. He, M. Heinz, T. W. Henry, S. Hepplemann, B. Hippolyte, A. Hirsch, E. Hjort, A. M. Hoffman, G. W. Hoffmann, D. J. Hofman, R. S. Hollis, M. J. Horner, H. Z. Huang, E. W. Hughes, T. J. Humanic, G. Igo, A. Iordanova, P. Jacobs, W. W. Jacobs, P. Jakl, F. Jin, P. G. Jones, E. G. Judd, S. Kabana, K. Kajimoto, K. Kang, J. Kapitan, M. Kaplan, D. Keane, A. Kechechyan, D. Kettler, V. Yu. Khodyrev, J. Kiryluk, A. Kisiel, S. R. Klein, A. G. Knospe, A. Kocoloski, D. D. Koetke, T. Kollegger, M. Kopytine, L. Kotchenda, V. Kouchpil, K. L. Kowalik, P. Kravtsov, V. I. Kravtsov, K. Krueger, C. Kuhn, A. Kumar, P. Kurnadi, M. A. C. Lamont, J. M. Landgraf, S. Lange, S. LaPointe, F. Laue, J. Lauret, A. Lebedev, R. Lednicky, C.-H. Lee, M. J. LeVine, C. Li, Q. Li, Y. Li, G. Lin, X. Lin, S. J. Lindenbaum, M. A. Lisa, F. Liu, H. Liu, J. Liu, L. Liu, T. Ljubicic, W. J. Llope, R. S. Longacre, W. A. Love, Y. Lu, T. Ludlam, D. Lynn, G. L. Ma, J. G. Ma, Y. G. Ma, D. P. Mahapatra, R. Majka, L. K. Mangotra, R. Manweiler, S. Margetis, C. Markert, H. S. Matis, Yu. A. Matulenko, T. S. McShane, A. Meschanin, J. Millane, M. L. Miller, N. G. Minaev, S. Mioduszewski, A. Mischke, J. Mitchell, B. Mohanty, D. A. Morozov, M. G. Munhoz, B. K. Nandi, C. Nattrass, T. K. Nayak, J. M. Nelson, C. Nepali, P. K. Netrakanti, M. J. Ng, L. V. Nogach, S. B. Nurushev, G. Odyniec, A. Ogawa, H. Okada, V. Okorokov, D. Olson, M. Pachr, S. K. Pal, Y. Panebratsev, A. I. Pavlinov, T. Pawlak, T. Peitzmann, V. Perevoztchikov, C. Perkins, W. Peryt, S. C. Phatak, M. Planinic, J. Pluta, N. Poljak, N. Porile, A. M. Poskanzer, M. Potekhin, B. V. K. S. Potukuchi, D. Prindle, C. Pruneau, N. K. Pruthi, J. Putschke, I. A. Qattan, R. Raniwala, S. Raniwala, R. L. Ray, D. Relyea, A. Ridiger, H. G. Ritter, J. B. Roberts, O. V. Rogachevskiy, J. L. Romero, A. Rose, C. Roy, L. Ruan, M. J. Russcher, V. Rykov, R. Sahoo, I. Sakrejda, T. Sakuma, S. Salur, J. Sandweiss, M. Sarsour, J. Schambach, R. P. Scharenberg, N. Schmitz, J. Seger, I. Selyuzhenkov, P. Seyboth, A. Shabetai, E. Shahaliev, M. Shao, M. Sharma, X.-H. Shi, E. P. Sichtermann, F. Simon, R. N. Singaraju, M. J. Skoby, N. Smirnov, R. Snellings, P. Sorensen, J. Sowinski, J. Speltz, H. M. Spinka, B. Srivastava, A. Stadnik, T. D. S. Stanislaus, D. Staszak, R. Stock, M. Strikhanov, B. Stringfellow, A. A. P. Suaide, M. C. Suarez, N. L. Subba, M. Sumbera, X. M. Sun, Z. Sun, B. Surrow, T. J. M. Symons, A. Szanto de Toledo, J. Takahashi, A. H. Tang, Z. Tang, T. Tarnowsky, D. Thein, J. H. Thomas, J. Tian, A. R. Timmins, S. Timoshenko, M. Tokarev, T. A. Trainor, V. N. Tram, A. L. Trattner, S. Trentalange, R. E. Tribble, O. D. Tsai, J. Ulery, T. Ullrich, D. G. Underwood, G. Van Buren, N. van der Kolk, M. van Leeuwen, A. M. Vander Molen, R. Varma, G. M. S. Vasconcelos, I. M. Vasilevski, A. N. Vasiliev, R. Vernet, F. Videbaek, S. E. Vigdor, Y. P. Viyogi, S. Vokal, S. A. Voloshin, M. Wada, W. T. Waggoner, F. Wang, G. Wang, J. S. Wang, Q. Wang, X. Wang, X. L. Wang, Y. Wang, J. C. Webb, G. D. Westfall, C. Whitten Jr., H. Wieman, S. W. Wissink, R. Witt, J. Wu, Y. Wu, N. Xu, Q. H. Xu, Z. Xu, P. Yepes, I.-K. Yoo, Q. Yue, M. Zawisza, H. Zbroszczyk, W. Zhan, H. Zhang, S. Zhang, W. M. Zhang, Y. Zhang, Z. P. Zhang, Y. Zhao, C. Zhong, J. Zhou, R. Zoulkarneev, Y. Zoulkarneeva, and J. X. Zuo
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Sigma, HERA, Coulomb excitation, Photon energy, Coupling (probability), 01 natural sciences, Helicity, Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Spin (physics), Glauber
Abstract: Photoproduction reactions occur when the electromagnetic field of a relativistic heavy ion interacts with another heavy ion. The STAR collaboration presents a measurement of rho^0 and direct pi^+pi^- photoproduction in ultra-peripheral relativistic heavy ion collisions at sqrt(s_{NN})=200 GeV. We observe both exclusive photoproduction and photoproduction accompanied by mutual Coulomb excitation. We find a coherent cross-section of sigma(AuAu) -> Au^*Au^*rho^0 = 530 pm 19 (stat.) pm 57 (syst.) mb, in accord with theoretical calculations based on a Glauber approach, but considerably below the predictions of a color dipole model. The rho^0 transverse momentum spectrum (p_{T}^2) is fit by a double exponential curve including both coherent and incoherent coupling to the target nucleus; we find sigma_{inc}/sigma_{coh} = 0.29 pm 0.03 (stat.) pm 0.08 (syst.). The ratio of direct pi^+pi^- to rho^0 production is comparable to that observed in gamma p collisions at HERA, and appears to be independent of photon energy. Finally, the measured rho^0 spin helicity matrix elements agree within errors with the expected s-channel helicity conservation.
Published: 2008

50. Proton-Λ correlations in central Au+Au collisions atsNN=200GeV

Author: J. Adams, M. M. Aggarwal, Z. Ahammed, J. Amonett, B. D. Anderson, D. Arkhipkin, G. S. Averichev, S. K. Badyal, Y. Bai, J. Balewski, O. Barannikova, L. S. Barnby, J. Baudot, S. Bekele, V. V. Belaga, A. Bellingeri-Laurikainen, R. Bellwied, J. Berger, B. I. Bezverkhny, S. Bharadwaj, A. Bhasin, A. K. Bhati, V. S. Bhatia, H. Bichsel, J. Bielcik, J. Bielcikova, A. Billmeier, L. C. Bland, C. O. Blyth, S.-L. Blyth, B. E. Bonner, M. Botje, A. Boucham, J. Bouchet, A. V. Brandin, A. Bravar, M. Bystersky, R. V. Cadman, X. Z. Cai, H. Caines, M. Calderón de la Barca Sánchez, J. Castillo, O. Catu, D. Cebra, Z. Chajecki, P. Chaloupka, S. Chattopadhyay, H. F. Chen, J. H. Chen, Y. Chen, J. Cheng, M. Cherney, A. Chikanian, H. A. Choi, W. Christie, J. P. Coffin, T. M. Cormier, M. R. Cosentino, J. G. Cramer, H. J. Crawford, D. Das, S. Das, M. Daugherity, M. M. de Moura, T. G. Dedovich, M. DePhillips, A. A. Derevschikov, L. Didenko, T. Dietel, S. M. Dogra, W. J. Dong, X. Dong, J. E. Draper, F. Du, A. K. Dubey, V. B. Dunin, J. C. Dunlop, M. R. Dutta Mazumdar, V. Eckardt, W. R. Edwards, L. G. Efimov, V. Emelianov, J. Engelage, G. Eppley, B. Erazmus, M. Estienne, P. Fachini, J. Faivre, R. Fatemi, J. Fedorisin, K. Filimonov, P. Filip, E. Finch, V. Fine, Y. Fisyak, K. S. F. Fornazier, J. Fu, C. A. Gagliardi, L. Gaillard, J. Gans, M. S. Ganti, F. Geurts, V. Ghazikhanian, P. Ghosh, J. E. Gonzalez, H. Gos, O. Grachov, O. Grebenyuk, D. Grosnick, S. M. Guertin, Y. Guo, A. Gupta, N. Gupta, T. D. Gutierrez, T. J. Hallman, A. Hamed, D. Hardtke, J. W. Harris, M. Heinz, T. W. Henry, S. Hepplemann, B. Hippolyte, A. Hirsch, E. Hjort, G. W. Hoffmann, M. J. Horner, H. Z. Huang, S. L. Huang, E. W. Hughes, T. J. Humanic, G. Igo, A. Ishihara, P. Jacobs, W. W. Jacobs, M. Jedynak, H. Jiang, P. G. Jones, E. G. Judd, S. Kabana, K. Kang, M. Kaplan, D. Keane, A. Kechechyan, V. Yu. Khodyrev, B. C. Kim, J. Kiryluk, A. Kisiel, E. M. Kislov, J. Klay, S. R. Klein, D. D. Koetke, T. Kollegger, M. Kopytine, L. Kotchenda, K. L. Kowalik, M. Kramer, P. Kravtsov, V. I. Kravtsov, K. Krueger, C. Kuhn, A. I. Kulikov, A. Kumar, R. Kh. Kutuev, A. A. Kuznetsov, M. A. C. Lamont, J. M. Landgraf, S. Lange, F. Laue, J. Lauret, A. Lebedev, R. Lednicky, C.-H. Lee, S. Lehocka, M. J. LeVine, C. Li, Q. Li, Y. Li, G. Lin, S. J. Lindenbaum, M. A. Lisa, F. Liu, H. Liu, J. Liu, L. Liu, Q. J. Liu, Z. Liu, T. Ljubicic, W. J. Llope, H. Long, R. S. Longacre, M. Lopez-Noriega, W. A. Love, Y. Lu, T. Ludlam, D. Lynn, G. L. Ma, J. G. Ma, Y. G. Ma, D. Magestro, S. Mahajan, D. P. Mahapatra, R. Majka, L. K. Mangotra, R. Manweiler, S. Margetis, C. Markert, L. Martin, J. N. Marx, H. S. Matis, Yu. A. Matulenko, C. J. McClain, T. S. McShane, F. Meissner, Yu. Melnick, A. Meschanin, M. L. Miller, N. G. Minaev, C. Mironov, A. Mischke, D. K. Mishra, J. Mitchell, B. Mohanty, L. Molnar, C. F. Moore, D. A. Morozov, M. G. Munhoz, B. K. Nandi, S. K. Nayak, T. K. Nayak, J. M. Nelson, P. K. Netrakanti, V. A. Nikitin, L. V. Nogach, S. B. Nurushev, G. Odyniec, A. Ogawa, V. Okorokov, M. Oldenburg, D. Olson, S. K. Pal, Y. Panebratsev, S. Y. Panitkin, A. I. Pavlinov, T. Pawlak, T. Peitzmann, V. Perevoztchikov, C. Perkins, W. Peryt, V. A. Petrov, S. C. Phatak, R. Picha, M. Planinic, J. Pluta, N. Porile, J. Porter, A. M. Poskanzer, M. Potekhin, E. Potrebenikova, B. V. K. S. Potukuchi, D. Prindle, C. Pruneau, J. Putschke, G. Rakness, R. Raniwala, S. Raniwala, O. Ravel, R. L. Ray, S. V. Razin, D. Reichhold, J. G. Reid, J. Reinnarth, G. Renault, F. Retiere, A. Ridiger, H. G. Ritter, J. B. Roberts, O. V. Rogachevskiy, J. L. Romero, A. Rose, C. Roy, L. Ruan, M. J. Russcher, R. Sahoo, I. Sakrejda, S. Salur, J. Sandweiss, M. Sarsour, I. Savin, P. S. Sazhin, J. Schambach, R. P. Scharenberg, N. Schmitz, K. Schweda, J. Seger, I. Selyuzhenkov, P. Seyboth, E. Shahaliev, M. Shao, W. Shao, M. Sharma, W. Q. Shen, K. E. Shestermanov, S. S. Shimanskiy, E. Sichtermann, F. Simon, R. N. Singaraju, N. Smirnov, R. Snellings, G. Sood, P. Sorensen, J. Sowinski, J. Speltz, H. M. Spinka, B. Srivastava, A. Stadnik, T. D. S. Stanislaus, R. Stock, A. Stolpovsky, M. Strikhanov, B. Stringfellow, A. A. P. Suaide, E. Sugarbaker, M. Sumbera, B. Surrow, M. Swanger, T. J. M. Symons, A. Szanto de Toledo, A. Tai, J. Takahashi, A. H. Tang, T. Tarnowsky, D. Thein, J. H. Thomas, A. R. Timmins, S. Timoshenko, M. Tokarev, T. A. Trainor, S. Trentalange, R. E. Tribble, O. D. Tsai, J. Ulery, T. Ullrich, D. G. Underwood, G. Van Buren, N. van der Kolk, M. van Leeuwen, A. M. Vander Molen, R. Varma, I. M. Vasilevski, A. N. Vasiliev, R. Vernet, S. E. Vigdor, Y. P. Viyogi, S. Vokal, S. A. Voloshin, W. T. Waggoner, F. Wang, G. Wang, X. L. Wang, Y. Wang, Z. M. Wang, H. Ward, J. W. Watson, J. C. Webb, G. D. Westfall, A. Wetzler, C. Whitten Jr., H. Wieman, S. W. Wissink, R. Witt, J. Wood, J. Wu, N. Xu, Z. Xu, Z. Z. Xu, E. Yamamoto, P. Yepes, I-K. Yoo, V. I. Yurevich, I. Zborovsky, H. Zhang, W. M. Zhang, Y. Zhang, Z. P. Zhang, C. Zhong, R. Zoulkarneev, Y. Zoulkarneeva, A. N. Zubarev, and J. X. Zuo
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Proton, Meson, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Nuclear Theory, Hadron, Lambda, Lambda baryon, 01 natural sciences, Baryon, Nuclear physics, Correlation function (statistical mechanics), 0103 physical sciences, Physics::Accelerator Physics, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics
Abstract: We report on p-Lambda, p-(Lambda) over bar, (p) over bar-Lambda, and (p) over bar-(Lambda) over bar correlation functions constructed in central Au-Au collisions at root s(NN) = 200 GeV by the STAR experiment at RHIC. The proton and lambda source size is inferred from the p-Lambda and (p) over bar-(Lambda) over bar correlation functions. It is found to be smaller than the pion source size also measured by the STAR experiment at smaller transverse masses, in agreement with a scenario of a strong universal collective flow. The p-(Lambda) over bar and (p) over bar-Lambda correlation functions, which are measured for the first time, exhibit a large anticorrelation. Annihilation channels and/or a negative real part of the spin-averaged scattering length must be included in the final-state interactions calculation to reproduce the measured correlation function.
Published: 2006

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