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73 results on '"Steven E. Skutnik"'

1. Plutonium Signatures in Molten-Salt Reactor Off-Gas Tank and Safeguards Considerations

Author: Nicholas Dunkle, Alex Wheeler, Jarod Richardson, Sandra Bogetic, Ondrej Chvala, and Steven E. Skutnik
Subjects: molten-salt reactors, plutonium signatures, beta particle spectroscopy, safeguards, Off-Gas management, Nuclear engineering. Atomic power, TK9001-9401
Abstract: Fluid-fueled molten-salt reactors (MSRs) are actively being developed by several companies, with plans to deploy them internationally. The current IAEA inspection tools are largely incompatible with the unique design features of liquid fuel MSRs (e.g., the complex fuel chemistry, circulating fuel inventory, bulk accountancy, and high radiation environment). For these reasons, safeguards for MSRs are seen as challenging and require the development of new techniques. This paper proposes one such technique through the observation of the reactor’s off-gas. Any reactor design using low-enriched uranium will build up plutonium as the fuel undergoes burnup. Plutonium has different fission product yields than uranium. Therefore, a shift in fission product production is expected with fuel evolution. The passive removal of certain gaseous fission products to the off-gas tank of an MSR provides a valuable opportunity for analysis without significant modifications to the design of the system. Uniquely, due to the gaseous nature of the isotopes, beta particle emissions are available for observation. The ratios of these fission product isotopes can, thus, be traced back to the relative amount and types of fissile isotopes in the core. This proposed technique represents an effective safeguards tool for bulk accountancy which, while avoiding being onerous, could be used in concert with other techniques to meet the IAEA’s timeliness goals for the detection of a diversion.
Published: 2023
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2. High Flux Isotope Reactor Neutron Spectrum Shape Estimation From Activation Experiment Data

Author: Steven E. Skutnik and Austin C. Stanford
Subjects: Nuclear and High Energy Physics, Nuclear Energy and Engineering, Electrical and Electronic Engineering
Published: 2023

3. Nerthus Thermal Spectrum Molten Salt Reactor Neutronics and Dynamic Model

Author: Nicholas Jon Dunkle, Jarod Richardson, Visura Pathirana, Alexander Wheeler, Ondrej Chvala, and Steven E. Skutnik
Published: 2023

4. Plutonium Signatures in Molten Salt Reactor Offgas Tank and Safeguards Considerations

Author: Nicholas Jon Dunkle, Alexander Wheeler, Jarod Richardson, Sandra Bogetic, Ondrej Chvala, and Steven E. Skutnik
Published: 2023

5. Examination of (α,n) Signatures as a Means of Plutonium Quantification in Electrochemical Reprocessing

Author: Stephen N. Gilliam, Jamie B. Coble, and Steven E. Skutnik
Subjects: Materials science, 010308 nuclear & particles physics, Radiochemistry, 0211 other engineering and technologies, chemistry.chemical_element, 02 engineering and technology, Electrochemistry, 01 natural sciences, Plutonium, Nuclear Energy and Engineering, chemistry, 0103 physical sciences, Neutron, 021108 energy, Nondestructive assay
Abstract: In this paper, we investigate the possibility of plutonium quantification within the electrorefiner vessel of an electrochemical separation facility via the use of the (α,n) neutron signature from ...
Published: 2021

6. Review of Candidate Techniques for Material Accountancy Measurements in Electrochemical Separations Facilities

Author: S. Nathan Gilliam, Steven E. Skutnik, Jamie B. Coble, and Michael P. Cooper
Subjects: Nuclear and High Energy Physics, Materials science, business.industry, 020209 energy, 02 engineering and technology, Pyroprocessing, Condensed Matter Physics, Electrochemistry, Spent nuclear fuel, 020303 mechanical engineering & transports, 0203 mechanical engineering, Nuclear Energy and Engineering, 0202 electrical engineering, electronic engineering, information engineering, Process engineering, business
Abstract: Electrochemical reprocessing (also commonly known as pyroprocessing) of used nuclear fuel is an alternative to aqueous reprocessing that confers a number of advantages, including the ability to pro...
Published: 2020

7. NERTHUS Thermal Molten Salt Reactor Neutronics and Fuel Cycle Model

Author: Nicholas Jon Dunkle, Visura Pathirana, Alexander Wheeler, Ondrej Chvala, and Steven E. Skutnik
Subjects: History, Polymers and Plastics, Business and International Management, Industrial and Manufacturing Engineering
Published: 2022

8. Assessment of SCALE and MELCOR for a generic pebble bed fluoride high-temperature reactor

Author: Robert F. Kile, Friederike Bostelmann, Steven E. Skutnik, William A. Wieselquist, and Nicholas R. Brown
Subjects: Nuclear Energy and Engineering
Published: 2022

9. Integrating Data Sources for Improved Safeguards and Accountancy of Electrochemical Fuel Reprocessing Systems. Final Report

Author: Jamie B. Coble, Jonathan T. Mitchell, Steven E. Skutnik, Stephen N. Gilliam, and Michael P. Cooper
Subjects: Waste management, Environmental science, Fuel reprocessing
Published: 2020

10. Signatures of plutonium diversion in Molten Salt Reactor dynamics

Author: Alexander M. Wheeler, Steven E. Skutnik, and Ondřej Chvála
Subjects: Frequency response, Molten salt reactor, 020209 energy, Nuclear engineering, chemistry.chemical_element, 02 engineering and technology, Enriched uranium, 01 natural sciences, 010305 fluids & plasmas, law.invention, Plutonium, Nuclear Energy and Engineering, chemistry, law, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, Environmental science, Neutron, Delayed neutron, Burnup
Abstract: Safeguarding a Molten Salt Reactor (MSR) is an underexplored research topic. The high temperature, radiation, and corrosive nature of the fuel salt make installing and using instrumentation difficult. This study introduces a new innovative way of using the reactor’s frequency response to determine if plutonium is diverted. As a low enriched uranium fueled MSR undergoes burnup, plutonium builds up in the fuel salt and increasingly contributes to fissions. As a result, the kinetic parameters, mean neutron generation time and delayed neutron fraction, evolve with depletion. These changes are large enough to be discerned as unique patterns in the MSR system frequency response. Likewise, a specific pattern is seen if there is a removal of plutonium. Given the simplicity of establishing a frequency response of an operating MSR, this method presents a breakthrough in MSR safeguards.
Published: 2021

11. Determining Optimal Used Fuel Allocation Strategies

Author: Steven E. Skutnik, James Ostrowski, Gordon M Petersen, and Robert Anthony Joseph Iii
Subjects: Nuclear and High Energy Physics, Government, Nuclear Energy and Engineering, Key (cryptography), Radioactive waste, Business, Environmental economics, Condensed Matter Physics, Spent nuclear fuel
Abstract: A key challenge in fulfilling the U.S. federal government’s obligations under the Nuclear Waste Policy Act is in the transition of used nuclear fuel (UNF) storage away from at-reactor storage and t...
Published: 2017

12. Sensitivity analysis for best-estimate thermal models of vertical dry cask storage systems

Author: Steven E. Skutnik, Remy R. DeVoe, and Kevin R Robb
Subjects: Pressure drop, Nuclear and High Energy Physics, Dry cask storage, Convective heat transfer, 020209 energy, Mechanical Engineering, Nuclear engineering, Mechanical engineering, 02 engineering and technology, Thermal conduction, 01 natural sciences, Spent nuclear fuel, 010305 fluids & plasmas, Thermal conductivity, Nuclear Energy and Engineering, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, Environmental science, General Materials Science, Decay heat, Safety, Risk, Reliability and Quality, Waste Management and Disposal, Burnup
Abstract: Loading requirements for dry cask storage of spent nuclear fuel are driven primarily by decay heat capacity limitations, which themselves are determined through recommended limits on peak cladding temperature within the cask. This study examines the relative sensitivity of peak material temperatures within the cask to parameters that influence both the stored fuel residual decay heat as well as heat removal mechanisms. These parameters include the detailed reactor operating history parameters (e.g., soluble boron concentrations and the presence of burnable poisons) as well as factors that influence heat removal, including non-dominant processes (such as conduction from the fuel basket to the canister and radiation within the canister) and ambient environmental conditions. By examining the factors that drive heat removal from the cask alongside well-understood factors that drive decay heat, it is therefore possible to make a contextual analysis of the most important parameters to evaluation of peak material temperatures within the cask. The goal of this analysis is to afford modelers the ability to develop best-estimate thermal models for vertical dry cask storage systems useful for material degradation studies. In contrast to more conservative bounding analyses used for safety and licensing studies (which are primarily intended to illustrate that recommended temperature limits are not exceeded), material degradation phenomena are frequently temperature-dependent, requiring best-estimate thermal models to properly evaluate. The canister-level parameters that have the greatest impact on peak fuel material temperatures drive convective heat transfer in the cask annulus (comprised of the region between the storage canister and the concrete overpack) and within the canister basket. These parameters include the ambient air temperature, the canister fill gas pressure, and the pressure drop between the annular region inlet and outlet. Other cask design parameters which would be expected to contribute substantially to the peak clad temperature were overall proved to be of marginal significance, including material properties such as the fuel basket thermal conductivity and emissivity, along with frictional flow losses from the spacer grid. Meanwhile, factors that drive conduction from the fuel basket region and material properties which drive radiative transport between the fuel and basket likewise exhibit low sensitivity for peak clad temperature estimates. Fuel irradiation history parameters that drive decay heat (such as the discharge burnup and average moderator density) nevertheless dominate peak clad temperature sensitivity. While the assembly power history significantly influences short-term decay heat post-discharge, it manifests minimal sensitivity for cooling times over 10 years and is thus of negligible importance for assemblies stored in wet storage for at least this time.
Published: 2017

13. Proposed re-evaluation of the 154Eu thermal n,γ capture cross-section based on spent fuel benchmarking studies

Author: Steven E. Skutnik
Subjects: 020209 energy, Nuclear data, 02 engineering and technology, Residual, Spent nuclear fuel, Nuclear physics, Cross section (physics), Neutron capture, Nuclear Energy and Engineering, Thermal, 0202 electrical engineering, electronic engineering, information engineering, Environmental science, Nuclide, Burnup
Abstract: 154 Eu is a nuclide of considerable importance to both non-destructive measurements of used nuclear fuel assembly burnup as well as for calculating the radiation source term for used fuel storage and transportation. However, recent evidence from code validation studies of spent fuel benchmarks have revealed evidence of a systemic bias in predicted 154 Eu inventories when using ENDF/B-VII.0 and ENDF/B-VII.1 nuclear data libraries, wherein 154 Eu is consistently over-predicted on the order of 10% or more. Further, this bias is found to correlate with sample burnup, resulting in a larger departure from experimental measurements for higher sample burnups. In this paper, the bias in 154 Eu is characterized across eleven spent fuel destructive assay benchmarks from five different assemblies. Based on these studies, possible amendments to the ENDF/B-VII.0 and VII.1 evaluations of the 154 Eu n , γ 155 Eu are explored. By amending the location of the first resolved resonance for the 154 Eu radiative capture cross-section (centered at 0.195 eV in ENDF/B-VII.0 and VII.1) to 0.188 eV and adjusting the neutron capture width proportional to 1 / E , the amended cross-section evaluation was found to reduce the bias in predicted 154 Eu inventories by approximately 5–7%. While the amended capture cross-section still results in a residual over-prediction of 154 Eu (ranging from 2% to 9%), the effect is substantially attenuated compared with the nominal ENDF/B-VII.0 and VII.1 evaluations.
Published: 2017

14. Beam Energy and Centrality Dependence of Direct-Photon Emission from Ultrarelativistic Heavy-Ion Collisions

Author: A. Sen, V. S. Pantuev, M. Sano, M. Stepanov, Emily D. Richardson, X. He, J. Zimamyi, O. O. Omiwade, M. Harvey, S. Belikov, K. S. Joo, A. Rakotozafindrabe, J. Hamblen, K. Hasuko, Y. Aramaki, V. Peresedov, Y. Watanabe, Ajit Kumar Mohanty, T. A. Shibata, C. L. Silva, R. A. Soltz, T. Sato, C. M. Camacho, R. S. Towell, Prashant Shukla, S. F. Pate, Dmitry Blau, Y. Fukao, A. Shevel, O. Jinnouchi, H. En'yo, J. Koster, M. Grosse Perdekamp, A. Hadj Henni, T. Hester, I. Younus, Ke. Nakamura, O. Drapier, H. Al-Bataineh, E. Vazquez-Zambrano, A. Nederlof, J. Park, H. Masui, A. K. Dubey, F. Matathias, H. Asano, Florian Bauer, M. Kasai, Y. Iwanaga, Joakim Nystrand, A. Vossen, T. L. Thomas, I. E. Yushmanov, Eun-Hee Kim, P. Constantin, Beomkyu Kim, Wei Xie, M. J. Leitch, A. A. Bickley, C. L. Woody, A. Veicht, A. Mwai, Eva Haslum, B. Lenzi, A. Soldatov, D. Isenhower, A. Toia, Tamas Novak, T. Moon, Kensuke Homma, H. Pei, L. Guo, Alexei Khanzadeev, Shinichi Masumoto, E. Stenlund, J. B. Choi, H. Sakata, Min-Hye Kim, R. Vértesi, S. H. Lee, Dipak Kumar Mishra, C. Baumann, M. S. Daugherity, C. P. Singh, T. Jones, Z. Rowan, Tomoya Tsuji, J. H. Bhom, T. V. Moukhanova, M. Mendoza, Peter Christiansen, R. Ichimiya, Atsushi Takahara, L. Mašek, D. Kawall, K. Tanida, Ryugo S. Hayano, I. J. Choi, B. Xia, S. Motschwiller, D. Ivanishchev, Dennis Perepelitsa, H. Themann, S. Chernichenko, V. Papavassiliou, Z. Ji, D. Winter, D. Yu Peressounko, Y. Riabov, Y. Onuki, C. E. Perezlara, Filip Krizek, N. A. Lewis, K. A. Drees, H. Lim, B. Bassalleck, S. Takagi, J. Bryslawskyj, Kenta Shigaki, M. Boer, M. Nguyen, V. I. Kochetkov, L. Aphecetche, S. Park, J. Murata, I. Nakagawa, Aaron Angerami, V-N. Tram, N. Grau, R. J. Petti, Sándor Lökös, K. N. Barish, J. M. Burward-Hoy, P. Tarján, S. N. White, J. G. Lajoie, Deepa Thomas, Jan Rak, R. Lacey, A. V. Kazantsev, Alexander Milov, Tae-Yeon Lee, Martin Purschke, C. A. Aidala, H. J. Kim, R. Granier de Cassagnac, A. Isupov, C. Suire, A. S. Nyanin, S. Zharko, S. Sano, S. Butsyk, Vladimir Samsonov, M. Konno, Gerd Joachim Kunde, A. Dion, Johannes Peter Wessels, I. Ravinovich, J. L. Charvet, S. Afanasiev, A. Ster, N. Feege, I. Otterlund, Christine Nattrass, A. Adare, J. Klatsky, C. P. Wong, M. Connors, W. A. Zajc, V. Baublis, A. Denisov, M. Leitgab, J. Sziklai, I. Shein, V. Cianciolo, Zvi Hirsh Citron, H. Ge, Rachid Nouicer, A. N. Zelenski, M. Proissl, Young-Ki Kim, T. Engelmore, Y. Tomita, Motoi Inaba, K. Nakano, M. J. Skoby, J. Newby, G. Roche, M. Mitrovski, Takafumi Niida, J. Huang, Hiroaki Ohnishi, K. B. Lee, Brian Cole, L. Tomášek, R. M. Wright, T. E. Miller, M. Kurosawa, Sergey Fokin, Z. Sun, A. Yu. Semenov, Bum-Hoon Lee, D. E. Mihalik, Senta Greene, K. Sedgwick, M. L. Brooks, S. Yokkaichi, W. C. Smith, B. M. Johnson, Alberto Baldisseri, Mihael Makek, K. Das, J. T. Mitchell, P. Mikeš, N. Hotvedt, R. Seidl, M. K. Dayananda, Prakhar Garg, B. Bannier, R. Belmont, M. Sarsour, A. T. Basye, M. K. Lee, B. Love, Marie Germain, C. Xu, E. P. Hartouni, Y. Miyachi, K. B. Kim, W. E. Sondheim, K. Boyle, P. A. Rukoyatkin, K. S. Sim, Kei Nagashima, V. Canoa Roman, P. Chung, M. I. Nagy, A. Morreale, Z. Fraenkel, Y. Nagata, M. Bai, D. Watanabe, M. D. Malik, Vladislav Manko, Saskia Mioduszewski, H. A. Gustafsson, M. Slunečka, E. Vznuzdaev, E. C. Aschenauer, S. S. Ryu, J. S. Kang, Junji Tojo, J. Gosset, Mate Csanad, A. Berdnikov, C. Zhang, J. P. Sullivan, A. Iordanova, A. Caringi, Frank Ellinghaus, E. R. Kinney, D. P. Morrison, B. H. Kang, M. Naglis, Tomofumi Nagae, J. L. Nagle, S. Y. Fung, M. B. Deaton, Y. Tanaka, T. K. Shea, P. Rosnet, B. Meredith, V. Khachatryan, D. Hornback, B. Komkov, P. Castera, J. Imrek, V. E. Semenov, B. E. Norman, M. Holmes, P. Ružička, Raphael Noel Tieulent, W. S. Emam, A. Datta, M. Javani, B. Fadem, E. O'Brien, Y. Kwon, A. G. Litvinenko, A. Kozlov, R. Seto, A. Bagoly, Maya Hachiya Shimomura, R. S. Hollis, G. David, L. Patel, T. C. Awes, Kyoichiro Ozawa, T. Liška, K. O. Eyser, K. Fujiwara, Y. L. Yamaguchi, N. Kamihara, R. K. Choudhury, T. Murakami, Robert F. Hobbs, B. Lewis, Viktor Riabov, Jun Kikuchi, Tadaaki Isobe, B. Azmoun, Y. J. Mao, K. Haruna, T. W. Danley, J. D. Osborn, A. Taranenko, R. Yang, H. Hiejima, S. Taneja, Kazushi Miki, H. Al-Ta'Ani, A. Král, M. J. Kweon, H. Kanou, J. S. Chai, Petr Gallus, T. Majoros, L. Ding, D. Roach, K. M. Kijima, Taku Gunji, H. Gong, M. Nihashi, Tatsuya Chujo, D. Richford, Zhiying You, K. Imai, Shoji Nagamiya, John Hill, K. Hashimoto, T. Horaguchi, Brajesh K. Singh, C. Silvestre, R. Bennett, M. Kawashima, J. Seele, Yoshifumi Ueda, H. J. Moon, Norio Saito, Tsutomu Mibe, P. Liebing, M. A. L. Leite, D. Sharma, C. Vale, P. L. McGaughey, K. Karatsu, M. Patel, F. Kajihara, F. Staley, L. Baksay, V. Dzhordzhadze, I. Danchev, A. Garishvili, David D'Enterria, Gary Grim, J. H. Do, T. Tabaru, S. Batsouli, B. Kurgyis, Toru Sugitate, L. D. Isenhower, K. V. Dharmawardane, Susumu Sato, Y. I. Makdisi, M. Kaneta, Xingguo Li, B. S. Chang, Y. Le Bornec, Ahmed Al-Jamel, Marisilvia Donadelli, V. Bumazhnov, M. P. Comets, Charles Maguire, J. L. Drachenberg, S. Leckey, M. Finger, S. Tarafdar, G. Mitsuka, Y. Hori, Anne Marie Sickles, J. Jin, J. E. Frantz, Jen-Chieh Peng, K. Gainey, I. V. Sourikova, N. Novitzky, Jongmin Lee, S. Choi, J. Klay, S. I. Morrow, H. Delagrange, Y. S. Kim, Y. H. Leung, Josh Moss, E. M. Takagui, S. P. Sorensen, Dylan Walker, R. P. Pisani, Debashish Pal, Y. Nakamiya, D. Lynch, S. Sawada, J. S. Bok, D. Kotchetkov, D. Reynolds, François Fleuret, H. W. Van Hecke, Y. Tsuchimoto, T. Ichihara, M. Oka, O. Chvala, H. Iinuma, M. C. McCain, S. Hasegawa, R. Tanabe, D. Layton, I. Garishvili, Akio Kiyomichi, J. Ying, Seong H. Kim, F. Wei, Inkyu Park, M. McCumber, J. Runchey, E. Kistenev, Xiong Wang, Z. Conesa del Valle, S. Zhou, Matthew G. Reuter, Herve Borel, B. Ujvari, Nikolay Tyurin, M. N. Wagner, Susanta K. Mohapatra, J. S. Kapustinsky, Takahiro Fusayasu, G. R. Young, M. Alfred, T. Hachiya, G. Baksay, Dong Jo Kim, A. P.T. Palounek, K. Okada, P. Lichtenwalner, A. Kiss, P. Kline, K. S. Lee, S. D. Rolnick, A. Enokizono, B. Espagnon, L. Zou, H. Harada, I. D. Ojha, Alexander Malakhov, Qiao Xu, N. Kurihara, ShinIchi Esumi, A. Glenn, A. Kravitz, J. M. Heuser, W. C. Chang, Z. Yasin, Henner Buesching, J. Sun, B. Forestier, M. T. Bjorndal, D. Silvermyr, S. Baumgart, L. S. Zolin, M. Ouchida, V. Babintsev, W. J. Park, Steve Edwards, M. Tomášek, N. Means, J. Asai, Atsushi Taketani, M. Wysocki, I. Tserruya, Masamichi Ishihara, A. Sukhanov, K. Kurita, Rushan Han, M. N. Hagiwara, Christopher Rosen, S. H. Lim, H. Pereira, P. D. Barnes, H. Yu, X. Gong, Y. Morino, Yu. Efremenko, A. Yanovich, V. Singh, V. L. Rykov, T. Dahms, A. Hodges, Marcus Hohlmann, G. S. Kyle, C. O. Kim, R. Pak, N. Willis, C. Y. Chi, M. J. Tannenbaum, James Alexander, Y. Ikeda, Shingo Sakai, S. P. Stoll, L. A. Linden Levy, J. G. Boissevain, Yasutada Akiba, H. Torii, P. V. Radzevich, Hirohiko Sato, S. K. Tuli, Minghui Liu, S. Bathe, Eunja Kim, E. J. Mannel, Agneta Oskarsson, S. Dairaku, D. Kincses, T. Rinn, Y. Berdnikov, R. Averbeck, Byung-Sik Hong, C. McKinney, M. Mishra, Kazuhiro Tanaka, Vaclav Vrba, Klaus Johannes Reygers, K. Hill, O. Zaudtke, Rui Wei, R. Akimoto, B. Sahlmueller, E. J. Desmond, A. Bazilevsky, Y. J. Kim, B. K. Schmoll, M. Virius, E. T. Atomssa, M. Heffner, A. Kim, Jaehyeok Yoo, D. Mukhopadhyay, E. Tennant, S. Rembeczki, M. Gonin, C. Pinkenburg, K. Dehmelt, J. D. Orjuela Koop, S. Kametani, C. H. Chen, Kenneth Francis Read, A. Manion, Y. Cobigo, Alexandre Lebedev, J. H. Kang, D. M. Lee, D. Bucher, J. S. Haggerty, S. R. Lee, A. Romana, S. Gadrat, Y. S. Lai, K. Kiriluk, J. Chiba, Alice Mignerey, X. Jiang, L. D'Orazio, S. Miyasaka, A. Franz, G. C. Mishra, Xiao-yan Li, Hiroyuki Sako, Y. Komatsu, Takao Sakaguchi, S. W. Nam, C. Klein-Boesing, A. D. Frawley, S. Huang, S. H. Aronson, W. Holzmann, O. Dietzsch, H. Valle, M. Chiu, Dipanwita Dutta, C. A. Ogilvie, Sung Keun Park, C. Gal, Julia Velkovska, S. Kelly, M. Rosati, N. N. Ajitanand, T. K. Hemmick, J. M. Durham, Yasuo Miake, Tamás Csörgő, Takahiro Nakamura, D. McGlinchey, Susumu Oda, A. A. Vinogradov, Henrik Tydesjö, L. Kochenda, M. Issah, T. Shohjoh, A. Durum, T. Kawagishi, Jiangyong Jia, D. S. Brown, K. Yamaura, S. Wolin, D. Kleinjan, S. Campbell, Hongfang Liu, D. E. Fields, B. V. Jacak, A. K. Purwar, R. Armendariz, J. Hanks, Byoungchoo Park, N. Apadula, C. Oakley, A. Drees, J. Kubart, K. Sakashita, D. Kotov, J. Egdemir, D. S. Jumper, F. Gastineau, Jason Kamin, Y. Goto, S. S.E. Rosendahl, K. Watanabe, G. Bunce, K. Shoji, A. Churyn, D. Jouan, W. Peng, P. W. Stankus, C. R. Cleven, C. Haegemann, Y. Inoue, P. J. Kroon, T. Kempel, Dong-Hun Kim, S. Kaneti, M. G. Hur, Steven E. Skutnik, M. Togawa, T. O. S. Haseler, H. Qu, Hideki Hamagaki, W. Fan, K. Aoki, M. Vargyas, T. Todoroki, K. I. Hahn, A. Deshpande, Helsinki Institute of Physics, Laboratoire de physique subatomique et des technologies associées (SUBATECH), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-IMT Atlantique (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique de Clermont (LPC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), PHENIX, Université de Nantes - Faculté des Sciences et des Techniques, Université de Nantes (UN)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Clermont Auvergne (UCA)-Centre National de la Recherche Scientifique (CNRS), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire de physique subatomique et des technologies associées ( SUBATECH ), IMT Atlantique Bretagne-Pays de la Loire ( IMT Atlantique ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ) -Université de Nantes ( UN ), Laboratoire Leprince-Ringuet ( LLR ), Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -École polytechnique ( X ) -Centre National de la Recherche Scientifique ( CNRS ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ), Institut de Physique Nucléaire d'Orsay ( IPNO ), Université Paris-Sud - Paris 11 ( UP11 ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire de Physique de Clermont ( LPC ), Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Université Clermont Auvergne ( UCA ) -Centre National de la Recherche Scientifique ( CNRS ), Institut de Physique Nucléaire de Lyon ( IPNL ), Université Claude Bernard Lyon 1 ( UCBL ), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS )
Subjects: Photon, heavy ion: scattering, 62.4 GeV-cms, Au+Au collisions, General Physics and Astronomy, transverse momentum dependence, 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], 39 GeV-cms/nucleon62.4 GeV-cms, [ PHYS.NEXP ] Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment (nucl-ex), Nuclear Experiment, 39 GeV-cms/nucleon, Physics, Range (particle radiation), RHIC, Large Hadron Collider, Multiplicative function, PHENIX, nucleus nucleus: colliding beams, PRIRODNE ZNANOSTI. Fizika, photon: direct production, CERN LHC Coll, photon: yield, COLISÕES DE ÍONS PESADOS RELATIVÍSTICOS, quark-gluon plasma, beam energy scan, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 114 Physical sciences, energy dependence, Nuclear physics, direct photons, energy: scaling, [ PHYS.HEXP ] Physics [physics]/High Energy Physics - Experiment [hep-ex], DILEPTONS, Au+Au collisions, beam energy scan, quark-gluon plasma, direct photons, PHENIX, RHIC, 0103 physical sciences, 010306 general physics, impact parameter: dependence, Scaling, Nuclear Physics, gold, NATURAL SCIENCES. Physics, Yield (chemistry), High Energy Physics::Experiment, Relativistic Heavy Ion Collider, Beam (structure), experimental results
Abstract: The PHENIX collaboration presents first measurements of low-momentum ($0.4$1\,GeV/$c$) direct-photon yield $dN_{\gamma}^{\rm dir}/d\eta$ is a smooth function of $dN_{\rm ch}/d\eta$ and can be well described as proportional to $(dN_{\rm ch}/d\eta)^\alpha$ with $\alpha{\approx}1.25$. This scaling behavior holds for a wide range of beam energies at the Relativistic Heavy Ion Collider and the Large Hadron Collider, for centrality selected samples, as well as for different, $A$$+$$A$ collision systems. At a given beam energy the scaling also holds for high $p_T$ ($>5$\,GeV/$c$) but when results from different collision energies are compared, an additional $\sqrt{s_{_{NN}}}$-dependent multiplicative factor is needed to describe the integrated-direct-photon yield., Comment: 673 authors from 82 institutions, 10 pages, 4 figures. v2 is version accepted for publication in Physical Review Letters. Plain text data tables for the points plotted in figures for this and previous PHENIX publications are (or will be) publicly available at http://www.phenix.bnl.gov/papers.html
Published: 2019

15. Plutonium Diversion Effect on Molten-Salt Reactor Dynamics

Author: Kyle Anderson, Steven E. Skutnik, Alexander M. Wheeler, and Ondrej Chvala
Subjects: Materials science, chemistry, Molten salt reactor, law, Metallurgy, chemistry.chemical_element, Plutonium, law.invention
Published: 2019

16. Applicability of the (?,n) Source Term as a Viable Safeguards Measurement for Electrochemical Reprocessing

Author: Steven E. Skutnik, Jamie B. Coble, and Stephen N. Gilliam
Subjects: Waste management, Environmental science, Term (time)
Published: 2019

17. Comparison and uncertainty of multivariate modeling techniques to characterize used nuclear fuel

Author: Amanda M. Bachmann, Jamie B. Coble, and Steven E. Skutnik
Subjects: Physics, Nuclear and High Energy Physics, Multivariate statistics, 010308 nuclear & particles physics, 020209 energy, Prediction interval, 02 engineering and technology, 01 natural sciences, Cross-validation, 0103 physical sciences, Partial least squares regression, Statistics, Ordinary least squares, 0202 electrical engineering, electronic engineering, information engineering, Principal component regression, Akaike information criterion, Instrumentation, Uncertainty analysis
Abstract: The ability to characterize used nuclear fuel (UNF) is important for nuclear nonproliferation safeguards, criticality safety, and fuel storage. Multiple efforts have been made to estimate the burnup (BU), initial enrichment (IE), and cooling time (CT) based on multivariate models of isotopic concentrations and radiation signatures of the fuel. This work provides a comparison of multivariate modeling techniques and extends previous work by quantifying the uncertainty of the best model to predict each characteristic. Model inputs used are simulated gamma and neutron emissions from UNF of varying BU, IE, and CT. Modeling techniques explored include Ordinary Least Squares Regression (OLS), Principal Component Regression (PCR), and Partial Least Squares Regression (PLS). Multiple PCR and PLS models were built based on different variable selection methods, such as cross validation and Akaike Information Criteria. The OLS model predictions have a root mean square percent error (RMSPE) of less than 10%, but the models are very unstable. The PCR models exhibit a trade-off between accurate and stable predictions. The best performing PCR and PLS models have similar predictions errors, but the PLS models are favored due to their stability. The best model for each characteristic is a single output PLS model based on cross validation. The uncertainty of each of these models, based on their prediction variance and biases, is 0.220 GWd/MTU, 0.051% U-235, and 0.694 years for the BU, IE, and CT models, respectively. By building a 95% prediction interval based on the corresponding uncertainty of each characteristic, 1.97% of the BU predictions, 23.03% of the IE predictions, and 100% of the CT predictions lack 95% confidence that they are within the prescribed accuracy requirement for the characteristic.
Published: 2021

18. Development of modern CANDU PHWR cross-section libraries for SCALE

Author: Nathan T. Shoman and Steven E. Skutnik
Subjects: Physics, Heavy water, Nuclear and High Energy Physics, Nuclear fission product, 010308 nuclear & particles physics, 020209 energy, Mechanical Engineering, Nuclear engineering, Nuclear data, 02 engineering and technology, 01 natural sciences, chemistry.chemical_compound, Nuclear Energy and Engineering, chemistry, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, Forensic engineering, General Materials Science, Safety, Risk, Reliability and Quality, Waste Management and Disposal
Abstract: A new set of SCALE fuel lattice models have been developed for the 28-element and 37-element CANDU fuel assembly designs using modern cross-section data from ENDF-B/VII.0 in order to produce new reactor data libraries for SCALE/ORIGEN depletion analyses. These new libraries are intended to provide users with a convenient means of evaluating depletion of CANDU fuel assemblies using ORIGEN through pre-generated cross sections based on SCALE lattice physics calculations. The performance of the new CANDU ORIGEN libraries in depletion analysis benchmarks to radiochemical assay data were compared to the previous version of the CANDU libraries provided with SCALE (based on WIMS-AECL models). Benchmark comparisons with available radiochemical assay data indicate that the new cross-section libraries perform well at matching major actinide species (U/Pu), which are generally within 1–4% of experimental values. The library also showed similar or better results over the WIMS-AECL library regarding fission product species and minor actinoids (Np, Am, and Cm). However, a notable exception was in calculated inventories of 154Eu and 155Eu, where the new library employing modern nuclear data (ENDF/B-VII.0) performed substantially poorer than the previous WIMS-AECL library (which used ENDF-B/VI.8 cross-sections for these species). The cause for this discrepancy appears to be due to differences in the 154Eu thermal capture cross-section between ENDF/B-VI.8 and ENDF/B-VII.0, an effect which is exacerbated by the highly thermalized flux of a CANDU heavy water reactor compared to that of a typical light-water reactor spectrum. Overall, the new SCALE-based CANDU libraries appear to give very good agreement to experimental benchmarks, indicating that the new libraries should provide satisfactory depletion calculation performance generally comparable or better to the prior WIMS-AECL libraries.
Published: 2016

19. Characterization of the non-uniqueness of used nuclear fuel burnup signatures through a Mesh-Adaptive Direct Search

Author: Steven E. Skutnik and David R. Davis
Subjects: Physics, Nuclear and High Energy Physics, Nuclear fission product, 010308 nuclear & particles physics, Fission, Nuclear engineering, chemistry.chemical_element, Context (language use), 01 natural sciences, Spent nuclear fuel, Plutonium, Nuclear physics, chemistry, 0103 physical sciences, Neutron, Nuclide, 010306 general physics, Instrumentation, Burnup
Abstract: The use of passive gamma and neutron signatures from fission indicators is a common means of estimating used fuel burnup, enrichment, and cooling time. However, while characteristic fission product signatures such as 134Cs, 137Cs, 154Eu, and others are generally reliable estimators for used fuel burnup within the context where the assembly initial enrichment and the discharge time are known, in the absence of initial enrichment and/or cooling time information (such as when applying NDA measurements in a safeguards/verification context), these fission product indicators no longer yield a unique solution for assembly enrichment, burnup, and cooling time after discharge. Through the use of a new Mesh-Adaptive Direct Search (MADS) algorithm, it is possible to directly probe the shape of this “degeneracy space” characteristic of individual nuclides (and combinations thereof), both as a function of constrained parameters (such as the assembly irradiation history) and unconstrained parameters (e.g., the cooling time before measurement and the measurement precision for particular indicator nuclides). In doing so, this affords the identification of potential means of narrowing the uncertainty space of potential assembly enrichment, burnup, and cooling time combinations, thereby bounding estimates of assembly plutonium content. In particular, combinations of gamma-emitting nuclides with distinct half-lives (e.g., 134Cs with 137Cs and 154Eu) in conjunction with gross neutron counting (via 244Cm) are able to reasonably constrain the degeneracy space of possible solutions to a space small enough to perform useful discrimination and verification of fuel assemblies based on their irradiation history.
Published: 2016

20. Low-momentum direct-photon measurement in Cu + Cu collisions at sNN=200GeV

Author: K. S. Joo, C. A. Ogilvie, T. K. Hemmick, O. Dietzsch, Yasuo Miake, E. T. Atomssa, H. Valle, J. G. Boissevain, C. P. Wong, T. Rinn, Masashi Kaneta, M. Connors, W. A. Zajc, Steven E. Skutnik, L. Kochenda, D. Kawall, S. Esumi, V. Baublis, Julia Velkovska, A. Denisov, V. Cianciolo, S. Bathe, T. O. S. Haseler, V. I. Kochetkov, Agneta Oskarsson, John Matthew Durham, M. Rosati, K. S. Sim, V. Dzhordzhadze, Y. Berdnikov, Y. Akiba, M. Mishra, C. Pinkenburg, K. Dehmelt, C. L. Woody, A. Berdnikov, Sergey Fokin, Tae-Yeon Lee, M. Grosse Perdekamp, G. Mitsuka, H. Qu, Junji Tojo, Y. Kwon, S. Nagamiya, Vaclav Vrba, Klaus Johannes Reygers, K. Hill, Y. Fukao, S. Park, J. Murata, Martin Purschke, C. A. Aidala, A. Shevel, S. Hasegawa, Hideki Hamagaki, W. Fan, K. Aoki, H. Hiejima, M. Stepanov, G. Roche, A. A. Vinogradov, K. O. Eyser, A. K. Purwar, K. Das, K. Fujiwara, E. P. Hartouni, A. Kiss, A. Bagoly, G. S. Kyle, Gerd Joachim Kunde, C. P. Singh, Z. Yasin, H. W. Van Hecke, T. Horaguchi, Henner Buesching, S. P. Sorensen, James Alexander, Dylan Walker, Herve Borel, N. Kamihara, R. Armendariz, T. Majoros, Jiangyong Jia, Y. Goto, K. Imai, J. T. Mitchell, N. Hotvedt, R. Seidl, N. A. Lewis, I. Shein, Petr Gallus, Marcus Hohlmann, R. Averbeck, A. Isupov, C. Suire, S. Kametani, T. Hester, M. J. Skoby, D. Sharma, Byung-Sik Hong, A. Bazilevsky, A. Morreale, Vladislav Manko, A. Taketani, A. Drees, J. Sziklai, Z. Fraenkel, V. L. Rykov, T. Dahms, J. G. Lajoie, Philippe Rosnet, V. Khachatryan, M. B. Deaton, S. Campbell, Anne Marie Sickles, P. Tarján, Alberto Baldisseri, C. L. Silva, S. Belikov, J. Kubart, H. A. Gustafsson, J. H. Kang, J. S. Haggerty, I. V. Sourikova, Brian Cole, A. Romana, R. S. Towell, J. S. Bok, D. Kotchetkov, L. Zou, Alexandre Lebedev, M. Alfred, T. Hachiya, I. Garishvili, Akio Kiyomichi, F. Wei, A. Hadj Henni, C. Zhang, Y. Tanaka, Masamichi Ishihara, D. E. Fields, T. L. Thomas, B. Azmoun, Y. J. Mao, A. Král, C. R. Cleven, C. Haegemann, Y. Inoue, John Hill, B. V. Jacak, M. J. Kweon, M. K. Lee, D. M. Lee, G. R. Young, N. Kurihara, Minghui Liu, V-N. Tram, E. J. Desmond, O. Zaudtke, C. Vale, B. S. Chang, A. Kravitz, D. Kotov, Ryugo S. Hayano, M. Naglis, M. Gonin, T. Hoshino, Nagahiro Saito, H. A. Torii, Toru Sugitate, J. Klay, H. Yu, J. Egdemir, L. D. Isenhower, F. Staley, L. Baksay, M. Heffner, Kenneth Francis Read, T. Ichihara, Viktor Riabov, M. Finger, Y. Riabov, J. Bryslawskyj, Wei Xie, M. McCumber, C. Y. Chi, M. Oka, Charles Maguire, B. Kurgyis, M. Togawa, Jan Rak, Y. Ueda, R. Lacey, Dong-Hun Kim, A. V. Kazantsev, Kenta Shigaki, M. Nguyen, J. Park, V. S. Pantuev, A. Dion, F. Matathias, Jason Kamin, K. Kurita, Kiyoshi Tanida, Y. S. Lai, Kensuke Homma, R. Granier de Cassagnac, A. Adare, E. Kistenev, H. Pereira, Motoi Inaba, J. D. Orjuela Koop, T. Tabaru, D. Richford, A. S. Nyanin, M. Sarsour, M. Csanad, S. P. Stoll, A. Rakotozafindrabe, M. Slunecka, R. Belmont, L. Tomášek, Z. Sun, P. Mikeš, A. Enokizono, Saskia Mioduszewski, P. Constantin, S. Chernichenko, Y. H. Leung, B. Komkov, H. Harada, D. E. Mihalik, J. Gosset, I. J. Choi, Rachid Nouicer, H. Pei, G. David, J. H. Do, B. Bassalleck, R. Pak, H. Iinuma, Y. Tsuchimoto, D. McGlinchey, Balazs Ujvari, M. Konno, Senta Greene, François Fleuret, K. Okada, Hiroaki Ohnishi, S. S.E. Rosendahl, T. C. Awes, Kyoichiro Ozawa, T. Liška, N. N. Ajitanand, A. P.T. Palounek, J. Jin, I. E. Yushmanov, Eun-Hee Kim, G. Bunce, H. En'yo, David D'Enterria, Jun Kikuchi, Alexei Khanzadeev, L. Aphecetche, E. M. Takagui, Y. Nakamiya, D. Lynch, M. J. Leitch, Tadaaki Isobe, I. Ravinovich, E. Stenlund, H. Sakata, N. Novitzky, Z. Rowan, S. N. White, A. Deshpande, M. Ouchida, G. Baksay, Takahiro Nakamura, P. L. McGaughey, M. A. L. Leite, B. E. Norman, J. Asai, E. O'Brien, M. Chiu, Y. Nagata, S. Yokkaichi, A. Churyn, D. Jouan, B. Sahlmueller, Susumu Oda, D. V. Perepelitsa, Johannes Peter Wessels, Xingguo Li, M. N. Wagner, Shingo Sakai, T. V. Moukhanova, R. A. Soltz, A. Durum, R. Vértesi, S. H. Lee, M. Issah, D. Watanabe, H. Ge, K. Nakano, M. D. Malik, E. Vznuzdaev, Y. Watanabe, J. D. Osborn, J. E. Frantz, V. Babintsev, W. E. Sondheim, I. Younus, R. Bennett, Jen-Chieh Peng, K. Boyle, P. A. Rukoyatkin, A. Soldatov, Osamu Jinnouchi, Matthew G. Reuter, Takahiro Fusayasu, Z. Ji, D. Winter, Hiroyuki Sako, D. Yu Peressounko, Xiong Wang, Alexander Malakhov, Qiao Xu, Dong Jo Kim, D. Silvermyr, L. S. Zolin, W. J. Park, S. H. Lim, P. D. Barnes, A. Yanovich, J. Chiba, Alice Mignerey, M. Wysocki, M. Mitrovski, J. Huang, Takao Sakaguchi, I. Tserruya, Yu. Efremenko, C. Klein-Boesing, A. D. Frawley, Prakhar Garg, V. Singh, A. Hodges, S. H. Aronson, W. Holzmann, S. F. Pate, Maya Hachiya Shimomura, Y. I. Makdisi, S. Butsyk, Vladimir Samsonov, H. Al-Bataineh, A. Glenn, P. V. Radzevich, M. J. Tannenbaum, B. K. Schmoll, Eunja Kim, D. Ivanishchev, Jaehyeok Yoo, D. Mukhopadhyay, S. Rembeczki, V. Papavassiliou, Sébastien Gadrat, Alexander Milov, I. Nakagawa, C. E. Perezlara, Eva Haslum, O. Drapier, Frank Ellinghaus, B. Lenzi, E. R. Kinney, Robert F. Hobbs, D. P. Morrison, V. E. Semenov, Tatsuya Chujo, S. Afanasiev, Tamas Ferenc Csorgo, A. Ster, N. Feege, S. I. Morrow, J. Newby, Debashish Pal, S. Sawada, J. Ying, A. Franz, J. Runchey, B. M. Johnson, J. L. Nagle, D. Hornback, C. Silvestre, A. Taranenko, Marisilvia Donadelli, V. Bumazhnov, M. P. Comets, Kazushi Miki, T. A. Shibata, D. Kincses, Min Soo Kim, D. Isenhower, A. Toia, Tamas Novak, T. Moon, L. Mašek, J. L. Charvet, Rushan Han, T. E. Miller, Kei Nagashima, V. Canoa Roman, P. Chung, Raphael Noel Tieulent, Susumu Sato, W. S. Emam, H. Kanou, Taku Gunji, H. Gong, J. Seele, M. Patel, F. Kajihara, H. Delagrange, S. Zhou, M. Virius, S. Takagi, M. Boer, Sándor Lökös, K. N. Barish, S. Zharko, M. L. Brooks, B. Love, Y. L. Yamaguchi, C. Xu, A. G. Litvinenko, A. Kozlov, R. Seto, K. Haruna, T. W. Danley, X. He, J. Zimamyi, O. O. Omiwade, V. Peresedov, S. Batsouli, H. Masui, A. K. Dubey, A. A. Bickley, N. Grau, K. Shoji, W. Peng, and P. W. Stankus
Subjects: Physics, Photon, Mass distribution, 010308 nuclear & particles physics, Hadron, Virtual particle, 01 natural sciences, Spectral line, Nuclear physics, Momentum, 0103 physical sciences, Mass spectrum, Rapidity, Nuclear Experiment, 010306 general physics
Abstract: We measured direct photons for pT
Published: 2018

21. Detection and positioning of radioactive sources using a four-detector response algorithm

Author: Steven E. Skutnik, Howard L. Hall, and Michael Joseph Willis
Subjects: Physics, Nuclear and High Energy Physics, Bearing (mechanical), Numerical analysis, Detector, Fuzzy logic, Particle detector, law.invention, law, Position (vector), Electromagnetic shielding, Measuring instrument, Instrumentation, Algorithm
Abstract: A method for detecting and identifying radioactive gamma-ray sources along with determining a directional bearing is described. This method is based upon comparing the relative intensities of four detectors placed side by side in a four-quadrant formation, allowing for the system to take advantage of shadowing in the occluded array of detectors. Based on this shielding principle, a fuzzy logic algorithm is used to analyze the gross count response of each individual detector with respect to the other three. The result of this algorithm is a numerical result that can be converted to a directional bearing in a 360° x–y plane.
Published: 2014

22. Evaluation Of Covert Plutonium Production From Unconventional Uranium Sources

Author: Tyrone Christopher Harris, Emily Anne Frame, Steven E. Skutnik, and Ondrej Chvala
Subjects: Radiation, Waste management, Natural resource economics, 020209 energy, chemistry.chemical_element, 02 engineering and technology, Uranium, lcsh:TK9001-9401, Plutonium, Nuclear Energy and Engineering, chemistry, Covert, 0202 electrical engineering, electronic engineering, information engineering, lcsh:Nuclear engineering. Atomic power, Chemical Engineering (miscellaneous), Production (economics), Environmental science, Physical and Theoretical Chemistry, Safety Research
Abstract: The potential for a relatively non-advanced nation to covertly acquire a significant quantity of weapons-grade plutonium using a gas-cooled, natural uranium-fueled reactor based on relatively primitive early published designed is evaluated in this article. The economic and technical issues that would influence the design decisions of a covert 239Pu production program are considered. Several unconventional uranium acquisition approaches were explored. Methods for extracting uranium from enrichment tails, seawater, and coal ash sources were considered. The evaluation indicated that uranium extraction from coal ash or insitu leaching from underground deposits could be performed in economical manner that might be difficult to detect by the international community. These two methods were estimated to be within the technical capabilities of an under-developed national. Calculations performed using the Monte Carlo N-Particle code (MCNP) showed that extracting uranium from enrichment tails would not be a technically feasible source for reactor fuel fabrication because the 235U concentration inside the enrichment tails would not be high enough to maintain criticality in the relatively unsophisticated reactor design considered. The SCALE code package was used to perform reactor physics and depletion calculations used to evaluate the effect of different combinations of uranium irradiation time and reactor power density had on plutonium production rates and isotope concentrations. The results of these simulations were used to estimate the desirability of the modeled plutonium for use in a weapon with published materials attractiveness figures of merit. All the modeled reactor conditions produced material that was highly attractive for use in a nuclear weapon. Historical examples of early gas-cooled reactors were used to examine the complexity associate with building various gas-cooled reactor designs. These examples were compared to simulated reactor conditions. The choices that a covert unsophisticated nuclear weapons program might consider when designing a reactor were evaluated. An air-cooled design was found to be a simple and cost effective solution for a group interested in producing a small number of significant quantities (8 kg) of plutonium.
Published: 2016

23. Scaling properties of fractional momentum loss of high-pThadrons in nucleus-nucleus collisions atsNNfrom 62.4 GeV to 2.76 TeV

Author: V. I. Kochetkov, Gerd Joachim Kunde, I. Shein, K. Sedgwick, Mihael Makek, Sung Keun Park, L. Guo, Y. Watanabe, N. N. Ajitanand, Alexei Khanzadeev, M. Tomášek, M. Rosati, Tamás Csörgő, Paul Constantin, G. D. N. Perera, A. Soldatov, Takahiro Nakamura, M. Grosse Perdekamp, G. S. Kyle, Shinichi Masumoto, E. Stenlund, M. E. Connors, S. Huang, Mate Csanad, A. A. Vinogradov, Susumu Oda, S. K. Park, A. Durum, Jiangyong Jia, M. Naglis, Y. Goto, H. Nakagomi, T. Hoshino, C. L. Silva, D. H. Kim, K. Yamaura, H. Sakata, J. M. Durham, J. H. Do, C. L. Towell, Susumu Sato, A. Yu. Semenov, A. Hadj Henni, M. Proissl, D. Kleinjan, D. Winter, D. Yu Peressounko, J. Bryslawskyj, I. Danchev, Dennis Perepelitsa, Byung-Sik Hong, Atsushi Takahara, P. Tarján, T. Niida, A. Lebedev, Beomkyu Kim, Wei Xie, Maya Hachiya Shimomura, A. Bazilevsky, Vardan Khachatryan, M. Nihashi, A. Meles, Yuhei Morino, Marisilvia Donadelli, V. Bumazhnov, M. P. Comets, S. Wolin, Y. I. Makdisi, Shunji Nishimura, K. A. Drees, N. Kamihara, T. E. Miller, T. Tabaru, T. Murakami, E. M. Takagui, David D'Enterria, F. Staley, Hongfang Liu, D. E. Fields, A. Deshpande, S. F. Pate, T. V. Moukhanova, Hiromi Iinuma, F. Matathias, R. Armendariz, Senta Greene, H. W. Yu, K. S. Sim, O. Dietzsch, K. Watanabe, Kei Nagashima, A. Baldisseri, Christian Klein-Boesing, M. McCumber, A. K. Purwar, Byoungchoo Park, R. P. Pisani, J. Rak, R. Belmont, R. Tanabe, S. Bathe, A. Drees, S. Yokkaichi, G. W. Kim, P. Chung, B. E. Norman, D. M. Lee, E. T. Atomssa, H. Valle, H. Van Hecke, J. Imrek, Agneta Oskarsson, I. J. Choi, B. Xia, M. J. Tannenbaum, Alberica Toia, Tae-Yeon Lee, Dipanwita Dutta, Robert F. Hobbs, E. O'Brien, B. K. Schmoll, S. Takagi, Raphael Noel Tieulent, Min-Hye Kim, Junji Tojo, J. Klatsky, J. B. Choi, C. Gal, J. Kubart, J. L. Klay, M. N. Wagner, W. S. Emam, Y. Berdnikov, M. Kawashima, Y. Fukao, A. Shevel, K. Kiriluk, Y. Ikeda, J. G. Boissevain, Masashi Kaneta, S. H. Lee, Y. Akiba, Anand Kumar Dubey, Barbara Jacak, S. Dairaku, Julia Velkovska, S. Kanda, Yongsun Kim, E. Tennant, S. Rembeczki, C. Silvestre, C. McKinney, S. V. Afanasiev, Martin Purschke, H. Sako, Rushan Han, M. Mishra, Brennan Schaefer, S. Nagamiya, T. Hester, R. S. Hollis, P. W. Stankus, E. P. Hartouni, Y. J. Kwon, M. Chiu, Ajit Kumar Mohanty, Z. Rowan, Tomoya Tsuji, T. A. Shibata, M. B. Deaton, M. K. Mitrovski, L. Aphecetche, C. A. Aidala, M. Mendoza, T. Sato, C. Baumann, S. Kametani, N. S. Bandara, Kensuke Homma, B. Kimelman, Vladimir Samsonov, Christine Nattrass, S. N. White, R. Akimoto, M. Patel, Y. Tanaka, E. Mannel, R. Yang, H. Hiejima, X. Jiang, C. Pinkenburg, C. P. Singh, N. A. Sparks, Christophe Pierre Suire, Alexander Milov, I. Nakagawa, R. Luechtenborg, Young-Ki Kim, T. Engelmore, N. Novitzky, K. N. Barish, C. A. Ogilvie, Kisung Lee, T. K. Hemmick, Bhawani Singh, M. K. Lee, K. Imai, Vaclav Vrba, Klaus Johannes Reygers, Astrid Morreale, Rui Wei, O. Zaudtke, J. S. Kang, K. O. Eyser, D. Isenhower, Tamas Novak, T. Moon, L. Mašek, D. Kotchetkov, A. Kiss, B. J. Ramson, Yasuo Miake, O. Drapier, V-N. Tram, N. Grau, Y. Onuki, M. Leitgab, Shuo Han, Johannes Peter Wessels, M. Stepanov, G. Roche, A. Iordanova, J. Murata, Zvi Hirsh Citron, M. Javani, Nagahiro Saito, P. Montuenga, C. R. Cleven, I. Younus, C. Haegemann, Y. Inoue, Tomofumi Nagae, J. L. Nagle, Yu. Efremenko, C. L. Woody, A. Berdnikov, B. M. Johnson, E. R. Kinney, Filip Krizek, V. S. Pantuev, S. Sawada, P. Castera, H. Ge, K. Das, Z. Yasin, Henner Buesching, Peter Christiansen, M. Sano, Steve Edwards, K. Nakano, E. Richardson, S. Chernichenko, J. H. Kang, Y. Miyachi, Motoi Inaba, J. C. Hill, J. S. Haggerty, Z. Fraenkel, S. R. Lee, J. Hamblen, H. Kanou, Torsten Dahms, H. J. Moon, A. Romana, R. Lacey, D. P. Morrison, K. DeBlasio, T. Kempel, L. Baksay, R. M. Wright, Jong-Min Park, Taku Gunji, H. Gong, S. Campbell, K. B. Kim, J. Ying, A. Franz, F. Kajihara, B. H. Kang, A. Isupov, A. Basye, M. Virius, L. Kochenda, M. Issah, Manabu Togawa, R. Granier de Cassagnac, M. S. Daugherity, W. E. Sondheim, A. Adare, X. Gong, Shoichi Hasegawa, H. Delagrange, R. K. Choudhury, B. Bassalleck, K. Okada, Steven E. Skutnik, Eun Joo Kim, Ferdinando Giordano, Charles Maguire, B. Sahlmueller, H. En'yo, R. Pinson, Don McGlinchey, B. Azmoun, Y. J. Mao, V. E. Semenov, Y. Komatsu, S. Choi, S. Butsyk, A. Král, J. Sziklai, L. A. Linden Levy, M. J. Leitch, M. J. Kweon, T. O. S. Haseler, S. Sano, K. Boyle, P. A. Rukoyatkin, H. Al-Ta'Ani, Tatsuya Chujo, J. D. Orjuela Koop, H. Qu, P. B. Diss, S. Zhou, P. Rosnet, S. D. Rolnick, S. Taneja, Petr Gallus, Osamu Jinnouchi, Brian Cole, R. S. Towell, K. Fujiwara, K. Sakashita, D. Kotov, C. H. Chen, M. Konno, B. Komkov, Kenjiro Miki, Y. S. Lai, K. Karatsu, K. Dehmelt, Hideki Hamagaki, K. Aoki, M. Vargyas, G. David, T. Todoroki, K. I. Hahn, Bruno Lenzi, E. Kistenev, Y. L. Yamaguchi, D. Mukhopadhyay, Frank Ellinghaus, Matthew G. Reuter, Takahiro Fusayasu, I. Garishvili, Akio Kiyomichi, Jen-Chieh Peng, F. Wei, Dmitry Blau, Y. Hori, Anne Marie Sickles, A. Manion, E. Leitner, H. Themann, K. Gainey, J. Egdemir, Jason Kamin, J. Huang, S. Mizuno, Tsutomu Mibe, M. A. L. Leite, E. J. Desmond, J. Hanks, Bum-Hoon Lee, Alexander Malakhov, J. S. Bok, I. Ravinovich, D. Reynolds, P. Kline, K. S. Lee, A. Dion, E. Vazquez-Zambrano, N. Kurihara, A. Nederlof, Y. Nakamiya, D. Lynch, H. Harada, A. Garishvili, Y. Nagata, S. P. Stoll, J. Ide, Prakhar Garg, M. Wysocki, D. Silvermyr, Inkyu Park, A. Rakotozafindrabe, S. H. Lim, M. Kasai, M. Bai, Y. Tsuchimoto, B. Bannier, G. R. Young, M. Gonin, Xiong Wang, E. C. Aschenauer, J. Chiba, L. S. Zolin, I. E. Yushmanov, Animesh Datta, T. Sumita, J. S. Kapustinsky, S. S.E. Rosendahl, G. Bunce, Alice Mignerey, J.-G. Park, L. D'Orazio, S. Miyasaka, C. Y. Chi, G. Baksay, W. J. Park, Christopher Rosen, C. M. Camacho, Prashant Shukla, Pawan Kumar Netrakanti, I. V. Sourikova, V. Babintsev, Dong Jo Kim, P. Liebing, P. D. Barnes, A. Yanovich, Aaron White, M. Beaumier, S. Belikov, K. S. Joo, K. Shoji, A. Churyn, Ke. Nakamura, A. Sukhanov, K. Kurita, Takao Sakaguchi, A. Sen, M. L. Brooks, M. Kurosawa, D. Hornback, Matthew Snowball, J. H. Yoo, J. D. Osborn, H. Al-Bataineh, Inseok Yoon, Zhiying You, D. K. Mishra, D. Jouan, A. D. Frawley, J. G. Rubin, B. Meredith, J. A. Key, R. Bennett, J. Sun, B. Lewis, S. H. Aronson, T. L.T. Thomas, C. O. Kim, N. Apadula, S. Motschwiller, R. Pak, A. Veicht, X. He, J. Zimamyi, S. Tarafdar, M. Finger, John Wood, H. A. Torii, D. Ivanishchev, V. Papavassiliou, W. Holzmann, H. F. Hamilton, J. E. Frantz, Jongmin Lee, I. Tserruya, Toru Sugitate, L. D. Isenhower, S. Kaneti, S. P. Sorensen, Sébastien Gadrat, D. Pal, Dylan Walker, J. Jin, A. Vossen, R. Petti, M. Jezghani, O. O. Omiwade, O. Chvala, Seong H. Kim, J. T. Mitchell, V. Singh, J. G. Lajoie, M. Alfred, T. Hachiya, S. Esumi, S. Lee, Jennifer E. Perry, A. Enokizono, Y. Aramaki, D. Sharma, R. Ichimiya, François Fleuret, A. Kravitz, N. Hotvedt, R. Seidl, Hiroaki Ohnishi, K. B. Lee, T. Koblesky, Vladislav Manko, A. Taketani, Priyanka Sett, H. Asano, V. Peresedov, Robert Vertesi, D. S. Jumper, Makoto Oka, M. Sarsour, V. L. Rykov, L. Ding, S. Mioduszewski, D. Roach, K. M. Kijima, J. Gosset, H. Pei, Eva Haslum, K. Hashimoto, A. Glenn, Xingguo Li, C. Vale, J. Koster, Eunja Kim, B. S. Chang, A. Timilsina, Timothy Thomas Rinn, H. J. Kim, H. Masui, A. Ster, N. Feege, A. A. Bickley, J. Newby, A. Mwai, B. Love, Tadaaki Isobe, A. G. Litvinenko, M. Slunečka, A. Taranenko, J. L. Charvet, A. Sexton, T. Horaguchi, P. L. McGaughey, A. Kozlov, R. Seto, K. Haruna, T. W. Danley, S. Beckman, Ralf Peter Averbeck, J. Seele, B. Fadem, V. Dzhordzhadze, L. Zou, M. Ouchida, S. Baumgart, Masamichi Ishihara, N. Means, Minghui Liu, J. Asai, M. Heffner, Kenneth Francis Read, H. Pereira, Shingo Sakai, T. Ichihara, A. V. Kazantsev, L. Tomášek, Ryugo S. Hayano, P. Mikeš, Y. Riabov, Kenta Shigaki, M. Nguyen, A. S. Nyanin, Rachid Nouicer, A. N. Zelenski, L. Patel, T. C. Awes, Kyoichiro Ozawa, T. Liška, Jun Kikuchi, Serpil Yalcin, Aaron Angerami, W. A. Zajc, L. Xue, V. Baublis, A. Denisov, Yuki Watanabe, V. Cianciolo, Sergey Fokin, S. Batsouli, K. V. Dharmawardane, R. A. Soltz, R. Kitamura, A. P.T. Palounek, J. Alexander, H. A. Gustafsson, S. R. P. Mohapatra, C. Zhang, P. Ružička, H. Borel, Viktor Riabov, M. I. Nagy, D. Watanabe, Marcus Hohlmann, M. D. Malik, E. Vznuzdaev, D. Kawall, and K. Tanida
Subjects: Quark, Physics, Particle physics, 010308 nuclear & particles physics, Hadron, Parton, 16. Peace & justice, 7. Clean energy, 01 natural sciences, 0103 physical sciences, High Energy Physics::Experiment, Rapidity, Nuclear Experiment, 010306 general physics, Centrality, Relativistic Heavy Ion Collider, Glauber, Energy (signal processing)
Abstract: Measurements of the fractional momentum loss $({S}_{\mathrm{loss}}\ensuremath{\equiv}\ensuremath{\delta}{p}_{T}/{p}_{T})$ of high-transverse-momentum-identified hadrons in heavy-ion collisions are presented. Using ${\ensuremath{\pi}}^{0}$ in $\mathrm{Au}+\mathrm{Au}$ and $\mathrm{Cu}+\mathrm{Cu}$ collisions at $\sqrt{{s}_{{}_{NN}}}=62.4$ and 200 GeV measured by the PHENIX experiment at the Relativistic Heavy Ion Collider and and charged hadrons in $\mathrm{Pb}+\mathrm{Pb}$ collisions measured by the ALICE experiment at the Large Hadron Collider, we studied the scaling properties of ${S}_{\mathrm{loss}}$ as a function of a number of variables: the number of participants, ${N}_{\mathrm{part}}$, the number of quark participants, ${N}_{\mathrm{qp}}$, the charged-particle density, $d{N}_{\mathrm{ch}}/d\ensuremath{\eta}$, and the Bjorken energy density times the equilibration time, ${\ensuremath{\varepsilon}}_{\mathrm{Bj}}{\ensuremath{\tau}}_{0}$. We find that the ${p}_{T}$, where ${S}_{\mathrm{loss}}$ has its maximum, varies both with centrality and collision energy. Above the maximum, ${S}_{\mathrm{loss}}$ tends to follow a power-law function with all four scaling variables. The data at $\sqrt{{s}_{{}_{NN}}}=200$ GeV and 2.76 TeV, for sufficiently high particle densities, have a common scaling of ${S}_{\mathrm{loss}}$ with $d{N}_{\mathrm{ch}}/d\ensuremath{\eta}$ and ${\ensuremath{\varepsilon}}_{\mathrm{Bj}}{\ensuremath{\tau}}_{0}$, lending insight into the physics of parton energy loss.
Published: 2016

24. Transverse energy production and charged-particle multiplicity at midrapidity in various systems fromsNN=7.7to 200 GeV

Author: I. Garishvili, Akio Kiyomichi, F. Wei, N. Kurihara, Animesh Datta, T. Sumita, M. G. Hur, M. Kurosawa, J. H. Yoo, B. Lewis, J. M. Burward-Hoy, C. Baumann, S. Kametani, C. P. Singh, S. Hayashi, D. Pal, J. Jin, B. M. Johnson, Filip Krizek, K. Dehmelt, A. Isupov, J. Sziklai, Brian Cole, Mate Csanad, Jen-Chieh Peng, B. Voas, K. O. Eyser, Y. Onuki, J. L. Charvet, P. Tarján, Y. J. Mao, A. Král, S. Takagi, H. Van Hecke, S. Bathe, A. Nukariya, D. Reynolds, Inkyu Park, Xiong Wang, Z. Conesa del Valle, Dong Jo Kim, Y. Ikeda, T. Murakami, E. M. Takagui, R. Lacey, Atsushi Takahara, I. Ravinovich, M. Nihashi, Kensuke Homma, E. Richardson, K. N. Barish, Shunji Nishimura, M. Gonin, M. Patel, X. Jiang, Ryugo S. Hayano, J. G. Boissevain, T. E. Miller, Tadaaki Isobe, R. Granier de Cassagnac, A. Adare, J. S. Chai, Robert F. Hobbs, Min-Hye Kim, Y. Le Bornec, Masashi Kaneta, Alberica Toia, C. Silvestre, S. Chernichenko, R. A. Soltz, David D'Enterria, N. Crossette, H. Lim, A. Veicht, Charles Maguire, A. Kiss, M. Naglis, Y. Nagata, B. Bassalleck, Yuhei Morino, Steven Kelly, K. A. Drees, J. Rak, Y. Riabov, S. Sano, Kei Nagashima, R. P. Pisani, M. Bai, H. Nakagomi, M. Skolnik, T. Hoshino, G. W. Kim, P. Chung, A. Denisov, Marisilvia Donadelli, Kenta Shigaki, M. Konno, Torsten Dahms, M. Slunečka, V. Bumazhnov, M. P. Comets, J. Klatsky, D. Black, E. C. Aschenauer, R. Akimoto, S. S. Ryu, Hari Guragain, J. Imrek, M. Holmes, C. L. Silva, D. H. Kim, S. Sawada, K. Hasuko, Z. Yasin, B. Azmoun, G. C. Mishra, J. Ying, A. Franz, Christophe Pierre Suire, Alexander Milov, I. Nakagawa, P. L. McGaughey, M. Nguyen, Young-Ki Kim, Henner Buesching, Raphael Noel Tieulent, Nikolay Tyurin, T. Engelmore, N. Novitzky, Jihyun Bhom, J. B. Choi, W. S. Emam, Y. Nakamiya, D. Lynch, M. N. Wagner, M. Kawashima, Steve Edwards, S. Tarafdar, H. Pei, J. Chiba, Alice Mignerey, A. Sukhanov, K. Kurita, K. S. Sim, T. Tabaru, Y. Gu, H. Asano, R. S. Towell, Prashant Shukla, H. Kanou, Jong-Min Park, S. F. Pate, Y. Fukao, Y. J. Kwon, J. Alexander, Taku Gunji, H. Gong, M. I. Nagy, M. S. Daugherity, H. Pereira, F. Kajihara, A. S. Nyanin, G. Baksay, A. Shevel, A. Basye, Junji Tojo, C. Pinkenburg, O. Drapier, Frank Ellinghaus, Matthew Snowball, J. D. Osborn, Inseok Yoon, Zhiying You, S. Beckman, Eun Joo Kim, R. S. Hollis, Ferdinando Giordano, Ke. Nakamura, E. P. Hartouni, R. Bennett, H. Al-Bataineh, H. Delagrange, R. Tanabe, Y. Komatsu, B. Love, M. T. Bjorndal, T. Hester, L. D'Orazio, M. R. Stone, S. Miyasaka, R. Yang, J. A. Key, S. Butsyk, Rachid Nouicer, D. Watanabe, A. N. Zelenski, Hiromi Iinuma, H. Hiejima, D. S. Brown, Marcus Hohlmann, S. W. Nam, Ralf Peter Averbeck, S. Motschwiller, E. R. Kinney, Marie Germain, S. Zhou, Ahmed Al-Jamel, T. L.T. Thomas, M. Finger, W. C. Smith, J. M. Durham, H. A. Gustafsson, D. P. Morrison, J. E. Frantz, D. Ivanishchev, Jongmin Lee, S. D. Rolnick, Y. S. Kim, B. Komkov, M. D. Malik, X. Gong, Pawan Kumar Netrakanti, E. Vznuzdaev, V. Papavassiliou, Sébastien Gadrat, C.Y. Chi, Joakim Nystrand, J. H. Do, A. Iordanova, C. L. Towell, Susumu Sato, C. O. Kim, Senta Greene, J. T. Mitchell, K. Imai, Ajit Kumar Mohanty, S. Campbell, T. A. Shibata, M. Stepanov, G. Roche, T. Sato, Laurent Bernard Aphecetche, L. Zou, A. G. Litvinenko, P. Kline, K. S. Lee, Herve Borel, A. Dion, S. Taneja, Eva Haslum, B. H. Kang, J. Murata, V. E. Semenov, N. Hotvedt, R. Seidl, R. Pak, Aaron White, Norio Saito, Tsutomu Mibe, M. A. L. Leite, Hideyuki Oide, J. Huang, Bum-Hoon Lee, S. Solano, A. Isinhue, Vladislav Manko, S. Baumgart, A. Enokizono, D. Isenhower, Masamichi Ishihara, P. K. Khandai, M. K. Dayananda, Prakhar Garg, Margaret Harvey, A. Taketani, Priyanka Sett, K. Karatsu, Tamas Novak, T. Moon, L. Mašek, M. Wysocki, B. Bannier, V-N. Tram, N. Grau, M. K. Lee, Y. Hori, Anne Marie Sickles, H. Al-Ta'Ani, Tatsuya Chujo, I. Tserruya, J. Gosset, H. Themann, K. Gainey, Minghui Liu, Takao Sakaguchi, A. Sen, L. Guo, J. L. Klay, Alexei Khanzadeev, Barbara Jacak, D. S. Jumper, M. Leitgab, Shinichi Masumoto, Shuo Han, L. A. Linden Levy, S. Kaneti, Makoto Oka, S. P. Sorensen, M. S. Ryu, S. H. Lim, V. L. Rykov, B. E. Norman, J. P. Sullivan, J. P. Wessels, J. Seele, J. S. Kang, M. Heffner, A. Ster, N. Feege, Kenneth Francis Read, Rushan Han, M. N. Hagiwara, E. Stenlund, M. Jezghani, V. Singh, S. Huang, Timothy Thomas Rinn, H. J. Kim, Dylan Walker, R. Belmont, C. Vale, B. S. Chang, J. S. Bok, S. R. P. Mohapatra, T. Niida, E. O'Brien, Motoi Inaba, J. C. Hill, S. Dairaku, P. Liebing, T. Ichihara, N. S. Bandara, J. S. Kapustinsky, S. V. Afanasiev, H. Sakata, H. Sako, R. M. Wright, C. Zhang, A. Lebedev, A. Timilsina, Toshiki Maruyama, Christine Angela Aidala, J. Newby, O. Chvala, V. Babintsev, O. Zaudtke, M. Tomášek, M. Rosati, X. H. Li, Paul Constantin, Franz E. Bauer, T. Koblesky, M. Beaumier, M. Ouchida, S. Belikov, K. S. Joo, A. V. Kazantsev, Vladimir Samsonov, I. Otterlund, Christine Nattrass, A. Bazilevsky, K. Sakashita, Tamás Csörgő, A. D. Frawley, M. C. McCain, G. S. Kyle, N. Willis, N. Means, D. K. Mishra, P. Ružička, M. Virius, J. Asai, Manabu Togawa, V. S. Pantuev, Byung-Sik Hong, M. Sarsour, J. G. Lajoie, M. Grosse Perdekamp, J. G. Rubin, X. Bai, Y. Watanabe, L. Tomášek, G. R. Young, D. Kotov, J. Sun, M. Alfred, T. Hachiya, P. Mikeš, M. Sano, Agneta Oskarsson, S. Lee, J. Egdemir, Jennifer E. Perry, N. Apadula, M. E. Connors, Bruno Espagnon, H. W. Yu, Shingo Sakai, S. H. Aronson, S. K. Park, Viktor Riabov, Shoichi Hasegawa, J. D. Orjuela Koop, C. H. Chen, D. Mukhopadhyay, G. David, A. Vossen, Tomofumi Nagae, J. L. Nagle, L. Patel, S. Leckey, A. Shaver, A. Kravitz, Sung Keun Park, A. Taranenko, J. Hamblen, A. A. Vinogradov, D. M. Lee, Hiroaki Ohnishi, K. B. Lee, Henrik Tydesjö, S. P. Whitaker, A. Manion, S. H. Lee, Serpil Yalcin, G. H. Lee, Y. Cobigo, C. McKinney, S. Choi, P. Castera, A. Glenn, Hirohiko Sato, S. Yokkaichi, S. K. Tuli, J. M. Heuser, R. Petti, M. Mishra, Brennan Schaefer, S. Nagamiya, S. J. Jeon, Kazuhiro Tanaka, A. Soldatov, J. Bryslawskyj, Jiangyong Jia, Y. Goto, T. Horaguchi, Y. Sekiguchi, T. C. Awes, Kyoichiro Ozawa, T. Liška, Josh Moss, Aaron Angerami, D. Kawall, Jun Kikuchi, K. Tanida, N. N. Ajitanand, Vaclav Vrba, Klaus Johannes Reygers, Astrid Morreale, Jason Kamin, T. V. Moukhanova, S. Esumi, Eunja Kim, Kenjiro Miki, H. Obayashi, David Olle Rickard Silvermyr, Bruno Lenzi, Rui Wei, W. Holzmann, H. F. Hamilton, D. Sharma, E. Kistenev, Maya Hachiya Shimomura, V. I. Kochetkov, C. L. Woody, Vardan Khachatryan, A. Berdnikov, W. A. Zajc, Yu. Efremenko, M. Proissl, P. Rosnet, L. Ding, Dmitry Blau, S. Mioduszewski, M. Kofarago, D. Kleinjan, L. Xue, K. Fujiwara, R. Ichimiya, D. Winter, D. Yu Peressounko, Y. I. Makdisi, D. Roach, K. M. Kijima, P. Lichtenwalner, G. D. N. Perera, V. Baublis, Yuki Watanabe, Y. L. Yamaguchi, V. Cianciolo, Zvi Hirsh Citron, Dennis Perepelitsa, H. Harada, K. Hashimoto, S. P. Stoll, E. J. Desmond, Sergey Fokin, J. H. Kang, Y. Miyachi, A. Caringi, J. S. Haggerty, Takahiro Nakamura, Tae-Yeon Lee, S. R. Lee, A. Romana, Xingguo Li, Gerd Joachim Kunde, Martin Purschke, F. Gastineau, S. Mizuno, I. Shein, K. Okada, T. W. Jones, Petr Gallus, J. Hanks, M. B. Deaton, E. Vazquez-Zambrano, A. Nederlof, B. Sahlmueller, Y. Berdnikov, O. Dietzsch, A. Garishvili, A. Hadj Henni, I. Danchev, E. T. Atomssa, Gary Grim, H. Valle, K. Sedgwick, H. En'yo, I. V. Sourikova, Dipanwita Dutta, S. Batsouli, K. V. Dharmawardane, A. Rakotozafindrabe, Y. Tanaka, Susumu Oda, E. Mannel, T. K. Shea, J. L. Drachenberg, Alberto Baldisseri, Mihael Makek, C. Gal, M. J. Leitch, M. J. Kweon, Julia Velkovska, Y. S. Lai, D. Kotchetkov, Beomkyu Kim, M. Javani, T. Shohjoh, M. Kasai, Y. Tsuchimoto, Y. Iwanaga, S. S.E. Rosendahl, M. J. Tannenbaum, H. J. Moon, F. Staley, L. Baksay, Wei Xie, A. Deshpande, A. Durum, M. Moskowitz, I. E. Yushmanov, G. Bunce, R. Kitamura, Z. Fraenkel, B. K. Schmoll, J.-G. Park, N. Cronin, A. P.T. Palounek, E. Tennant, I. J. Choi, S. Rembeczki, B. Xia, R. K. Choudhury, D. Bucher, K. Yamaura, A. Meles, Osamu Jinnouchi, P. Steinberg, Matthew G. Reuter, Takahiro Fusayasu, I. D. Ojha, Alexander Malakhov, L. S. Zolin, W. J. Park, Christopher Rosen, P. D. Barnes, A. Yanovich, Z. Rowan, Tomoya Tsuji, M. Mendoza, M. L. Brooks, S. N. White, Deepa Thomas, H. Ge, K. Das, K. Nakano, K. B. Kim, W. E. Sondheim, K. Boyle, P. A. Rukoyatkin, D. Hornback, S. Y. Fung, A. Churyn, D. Danley, B. Meredith, Hongfang Liu, D. E. Fields, H. A. Torii, Toru Sugitate, L. D. Isenhower, D. Jouan, M. McCumber, A. K. Purwar, N. Riveli, François Fleuret, B. Forestier, M. Chiu, M. K. Mitrovski, C. A. Ogilvie, T. K. Hemmick, Bhawani Singh, B. J. Ramson, Yasuo Miake, K. DeBlasio, L. Kochenda, M. Issah, R. Pinson, Y. Akiba, Don McGlinchey, T. Kawagishi, S. Wolin, K. Watanabe, Christian Klein-Boesing, N. Kamihara, Aram Kim, F. Matathias, R. Armendariz, Byoungchoo Park, K. Shoji, Anand Kumar Dubey, C. Oakley, A. Drees, J. Kubart, S. Kanda, Yongsun Kim, P. W. Stankus, B. Kimelman, J. Midori, P. Montuenga, C. R. Cleven, I. Younus, C. Haegemann, Y. Inoue, Peter Christiansen, P. J. Kroon, T. Kempel, Y. Imazu, Steven E. Skutnik, T. O. S. Haseler, H. Qu, P. B. Diss, Hideki Hamagaki, K. Aoki, M. Vargyas, T. Todoroki, K. I. Hahn, A. Sexton, A. Kozlov, R. Seto, K. Haruna, B. Fadem, V. Dzhordzhadze, X. He, J. Zimamyi, O. O. Omiwade, Y. Aramaki, V. Peresedov, Robert Vertesi, J. Koster, H. Masui, A. A. Bickley, and A. Mwai
Subjects: Physics, Particle physics, 010308 nuclear & particles physics, Critical phenomena, Constituent quark, Kinetic energy, 01 natural sciences, Charged particle, Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, Rapidity, Multiplicity (chemistry), Nuclear Experiment, 010306 general physics, Nucleon, Glauber
Abstract: Measurements of midrapidity charged particle multiplicity distributions, $dN_{\rm ch}/d\eta$, and midrapidity transverse-energy distributions, $dE_T/d\eta$, are presented for a variety of collision systems and energies. Included are distributions for Au$+$Au collisions at $\sqrt{s_{_{NN}}}=200$, 130, 62.4, 39, 27, 19.6, 14.5, and 7.7 GeV, Cu$+$Cu collisions at $\sqrt{s_{_{NN}}}=200$ and 62.4 GeV, Cu$+$Au collisions at $\sqrt{s_{_{NN}}}=200$ GeV, U$+$U collisions at $\sqrt{s_{_{NN}}}=193$ GeV, $d$$+$Au collisions at $\sqrt{s_{_{NN}}}=200$ GeV, $^{3}$He$+$Au collisions at $\sqrt{s_{_{NN}}}=200$ GeV, and $p$$+$$p$ collisions at $\sqrt{s_{_{NN}}}=200$ GeV. Centrality-dependent distributions at midrapidity are presented in terms of the number of nucleon participants, $N_{\rm part}$, and the number of constituent quark participants, $N_{q{\rm p}}$. For all $A$$+$$A$ collisions down to $\sqrt{s_{_{NN}}}=7.7$ GeV, it is observed that the midrapidity data are better described by scaling with $N_{q{\rm p}}$ than scaling with $N_{\rm part}$. Also presented are estimates of the Bjorken energy density, $\varepsilon_{\rm BJ}$, and the ratio of $dE_T/d\eta$ to $dN_{\rm ch}/d\eta$, the latter of which is seen to be constant as a function of centrality for all systems.
Published: 2016

25. An Examination of Simplification and Uncertainty on Material Attractiveness Evaluation for Proliferation Resistance Assessment

Author: Steven E. Skutnik and Man-Sung Yim
Subjects: Attractiveness, Nuclear and High Energy Physics, 020303 mechanical engineering & transports, 0203 mechanical engineering, Nuclear Energy and Engineering, Risk analysis (engineering), Resistance (ecology), 020209 energy, 0202 electrical engineering, electronic engineering, information engineering, Environmental science, 02 engineering and technology, Condensed Matter Physics
Published: 2012

26. Assessment of fuel cycle proliferation resistance dynamics using coupled isotopic characterization

Author: Steven E. Skutnik and Man-Sung Yim
Subjects: Nuclear fuel cycle, Nuclear and High Energy Physics, Engineering, Nuclear fuel, business.industry, Mechanical Engineering, Nuclear engineering, chemistry.chemical_element, Mechanical engineering, Minor actinide, Actinide, Uranium, Characterization (materials science), Nuclear Energy and Engineering, chemistry, General Materials Science, Direct coupling, Safety, Risk, Reliability and Quality, business, Waste Management and Disposal, Burnup
Abstract: A method for the assessment of intrinsic proliferation resistance (PR) in a variety of nuclear fuel cycle systems as a dynamic quantity is described in this paper. This method is based upon the direct coupling of a code for nuclear fuel isotopic characterization (ORIGEN-S) to a model for proliferation resistance, based upon a generalized fuel cycle model. The resulting coupled model is applied to evaluate PR as a dynamic system property as a function of three fuel cycle categories: open cycles, a “modified open cycle” (MOC) consisting of limited actinide recycle, and a fully closed cycle. Proliferation resistance is evaluated along several key operational parameters of the chosen fuel cycles, including fuel burnup and actinide separation strategies (including uranium and minor actinide co-extraction). For purposes of demonstration, a PR model developed at NC State shall be used for fuel cycle PR evaluation; the mechanics of this model will be presented in brief.
Published: 2011

27. Photoproduction of J/ψ and of high mass e+e− in ultra-peripheral Au + Au collisions at sNN=200 GeV

Author: T. L. Thomas, R. Vértesi, Masamichi Ishihara, Kensuke Homma, J. M. Heuser, Ryugo S. Hayano, J. Gosset, M. Gonin, J. P. Sullivan, S. Chernichenko, Y. Riabov, Minghui Liu, Kenta Shigaki, H. Lim, K. Hasuko, B. Bassalleck, M. Nguyen, A. S. Nyanin, Hiroyuki Okada, K. Kurita, M. Heffner, Kenneth Francis Read, T. Ichihara, H. Pereira, J. Murata, J. Chiba, M. Konno, J. M. Burward-Hoy, Joakim Nystrand, Eva Haslum, P. Tarján, G. C. Mishra, E. J. Desmond, Takao Sakaguchi, M. Togawa, S. Kelly, V. Bumazhnov, M. P. Comets, J. Park, Y. J. Kwon, W. C. Smith, Florian Bauer, S. Bathe, S. Yokkaichi, N. N. Ajitanand, C. Klein-Boesing, Y. Tsuchimoto, A. D. Frawley, Robert F. Hobbs, M. Rosati, T. Tabaru, J. L. Drachenberg, Y. Berdnikov, I. E. Yushmanov, Eun-Hee Kim, S. Y. Fung, M. K. Lee, Takahiro Nakamura, Alexei Khanzadeev, I. Tserruya, T. V. Moukhanova, S. H. Aronson, Y. Akiba, S. Nagamiya, J. T. Mitchell, S. Kametani, Senta Greene, S. P. Sorensen, Yu. Efremenko, B. Komkov, Hans-Åke Gustafsson, A. A. Vinogradov, K. Das, Henrik Tydesjö, T. Shohjoh, A. Ster, W. Holzmann, Kazuhiro Tanaka, C. A. Ogilvie, Jiangyong Jia, Tadaaki Isobe, Vladislav Manko, Evert Anders Stenlund, Debashish Pal, V. Singh, J. S. Chai, Norio Saito, T. K. Hemmick, M. A. L. Leite, A. Durum, J. H. Kang, J. S. Haggerty, S. Sawada, E. P. Hartouni, A. Hadj Henni, J. Newby, G. Roche, Yasuo Miake, Maya Hachiya Shimomura, B. E. Norman, Y. Tanaka, A. Franz, Y. Goto, John Hill, H. A. Torii, L. Kochenda, Y. I. Makdisi, A. Romana, E. O'Brien, P. L. McGaughey, D. S. Brown, M. N. Hagiwara, Wei Xie, Shingo Sakai, C. L. Woody, S. Gadrat, Toru Sugitate, T. Kawagishi, B. Azmoun, J. G. Lajoie, T. Hachiya, David D'Enterria, R. A. Soltz, H. Borel, A. V. Kazantsev, C. Vale, Ingvar Otterlund, B. Espagnon, Klaus Johannes Reygers, Anders Nils Erik Oskarsson, I. J. Choi, Christine Angela Aidala, M. J. Tannenbaum, S. Batsouli, M. Grosse Perdekamp, V. Babintsev, L. D. Isenhower, Hiroaki Ohnishi, T. K. Shea, R. P. Pisani, A. Taranenko, D. Mukhopadhyay, M. J. Kweon, G. S. Kyle, François Fleuret, N. Kamihara, F. Matathias, R. Armendariz, O. Dietzsch, H. Valle, D. Bucher, N. Willis, D. E. Fields, I. V. Sourikova, Osamu Jinnouchi, Y. Le Bornec, B. V. Jacak, S. V. Afanasiev, L. Aphecetche, James Alexander, Matthew G. Reuter, A. Drees, T. C. Awes, Kyoichiro Ozawa, R. Averbeck, Byung-Sik Hong, Nikolay Tyurin, M. C. McCain, J. G. Boissevain, A. Bazilevsky, M. N. Wagner, Masashi Kaneta, B. Forestier, M. T. Bjorndal, I. D. Ojha, Alexander Malakhov, A. K. Purwar, Julia Velkovska, J. Egdemir, A. P.T. Palounek, H. Pei, M. Wysocki, D. Winter, D. Silvermyr, D. Yu Peressounko, P. Rosnet, Y. Fukao, Xingguo Li, Alexandre Lebedev, D. M. Lee, L. S. Zolin, C. Pinkenburg, Johannes Peter Wessels, M. Csanad, S. P. Stoll, W. J. Park, R. S. Towell, S. S.E. Rosendahl, G. Bunce, P. D. Barnes, A. Yanovich, M. Stepanov, Akio Kiyomichi, C. Zhang, Hirohiko Sato, A. Dion, M. Issah, S. F. Pate, D. Jouan, Margaret Harvey, V-N. Tram, S. N. White, N. Kurihara, M. D. Malik, E. Vznuzdaev, S. K. Tuli, Viktor Riabov, Motoi Inaba, M. G. Hur, C. Y. Chi, Charles Maguire, S. Leckey, C. R. Cleven, W. E. Sondheim, V. Papavassiliou, K. Boyle, P. A. Rukoyatkin, S. Belikov, K. S. Joo, W. A. Zajc, Josh Moss, J. E. Frantz, H. W. Van Hecke, V. Baublis, A. Denisov, V. Cianciolo, Jen-Chieh Peng, E. Kistenev, P. J. Kroon, Sergey Fokin, C. P. Singh, T. Horaguchi, B. M. Johnson, H. Harada, S. Esumi, A. Kiss, D. Sharma, A. Glenn, A. Taketani, Xiong Wang, Z. Conesa del Valle, K. S. Sim, Steven E. Skutnik, Henner Buesching, Dong Jo Kim, Martin Purschke, F. Gastineau, V. L. Rykov, T. Dahms, A. Isupov, C. Suire, H. Qu, D. Kotchetkov, Hideki Hamagaki, K. Aoki, G. David, Junji Tojo, Z. Fraenkel, Alexander Milov, N. Grau, J. Sziklai, K. Shoji, I. Ravinovich, O. Drapier, P. W. Stankus, E. R. Kinney, Brian Cole, D. P. Morrison, S. Campbell, V. E. Semenov, J. Zimányi, Tatsuya Chujo, Y. Nagata, H. Hiejima, S. S. Ryu, Saskia Mioduszewski, K. Imai, R. Bennett, Ahmed Al-Jamel, J. Jin, E. M. Takagui, O. Zaudtke, Jan Rak, R. Lacey, R. Granier de Cassagnac, Y. Cobigo, Anne Marie Sickles, G. R. Young, M. Naglis, C. L. Silva, V. S. Pantuev, Susumu Sato, S. Butsyk, Vladimir Samsonov, Tamas Ferenc Csorgo, K. Okada, J. L. Nagle, B. Sahlmueller, H. En'yo, P. Constantin, M. J. Leitch, F. Staley, A. Deshpande, Y. Watanabe, I. Younus, A. Soldatov, K. Tanida, V. I. Kochetkov, Gerd Joachim Kunde, I. Shein, X. He, O. O. Omiwade, V. Peresedov, H. Masui, A. K. Dubey, S. Takagi, K. N. Barish, Taku Gunji, F. Kajihara, H. Delagrange, A. Baldisseri, Y. S. Kim, T. E. Miller, A. Enokizono, M. Holmes, M. Chiu, T. A. Shibata, M. L. Brooks, D. Isenhower, Marie Germain, A. G. Litvinenko, A. Kozlov, R. Seto, K. Haruna, and V. Dzhordzhadze
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, 0103 physical sciences, High mass, High Energy Physics::Experiment, Neutron, Coulomb excitation, Nuclear Experiment, 010306 general physics, Relativistic Heavy Ion Collider, 01 natural sciences
Abstract: We present the first measurement of photoproduction of J/psi and of two-photon production of high-mass e(+)e(-) pairs in electromagnetic (or ultra-peripheral) nucleus-nucleus interactions, using Au + Au data at root s(NN) = 200 GeV. The events are tagged with forward neutrons emitted following Coulomb excitation of one or both Au* nuclei. The event sample consists of 28 events with m(e+e-) > 2 GeV/c(2) with zero like-sign background. The measured cross sections at midrapidity of d sigma/dy (J/psi + Xn, y = 0) = 76 +/- 33 (stat) +/- 11 (syst) pb and d(2)sigma /dm dy (e(+) e(-) + Xn, y = 0) = 86 +/- 23(stat) +/- 16(syst) mu b/ (GeV/c(2)) for m(e+e-) epsilon vertical bar 2.0, 2.8 vertical bar GeV/c(2) have been compared and found to be consistent with models for photoproduction of J/psi and QED based calculations of two-photon production of e(+)e(-) pairs. (C) 2009 Elsevier B.V. All rights reserved.
Published: 2009

28. Dilepton mass spectra in p+p collisions at s=200 GeV and the contribution from open charm

Author: K. S. Joo, K. N. Barish, Hiroaki Ohnishi, T. Ichihara, J. Chiba, Matthew G. Reuter, M. L. Brooks, Takahiro Fusayasu, Tadaaki Isobe, A. Deshpande, A. P.T. Palounek, Alexander Malakhov, L. Tomášek, Takao Sakaguchi, D. Sharma, D. Silvermyr, P. L. McGaughey, Xingguo Li, C. Klein-Boesing, L. S. Zolin, W. J. Park, X. He, O. O. Omiwade, M. Chiu, V. S. Pantuev, P. D. Barnes, A. Yanovich, V. Peresedov, Tae-Yeon Lee, A. V. Kazantsev, Martin Purschke, A. D. Frawley, T. Tabaru, P. Mikeš, Herve Borel, D. Lynch, T. C. Awes, Kyoichiro Ozawa, T. Liška, Jun Kikuchi, Christophe Pierre Suire, Alexander Milov, J. Gosset, S. P. Sorensen, Dylan Walker, S. Batsouli, H. Masui, A. K. Dubey, D. Kotchetkov, J. G. Lajoie, S. H. Aronson, W. Holzmann, Saskia Mioduszewski, Junji Tojo, S. N. White, I. Younus, T. Hachiya, Y. L. Yamaguchi, B. Komkov, A. A. Bickley, B. Love, I. J. Choi, Minghui Liu, A. Kravitz, Youngil Kwon, C. Silvestre, A. Morreale, R. A. Soltz, Alexei Khanzadeev, Kenneth Francis Read, Z. Fraenkel, M. Gonin, K. Okada, V. L. Rykov, T. Dahms, A. G. Litvinenko, Norio Saito, A. Soldatov, M. A. L. Leite, J. Velkoška, D. Kawall, Marisilvia Donadelli, V. Bumazhnov, H. Pereira, Andry Malala Rakotozafindrabe, B. Sahlmueller, B. Azmoun, A. Král, M. J. Kweon, M. Rosati, K. Das, H. En'yo, K. Tanida, M. J. Leitch, Hiroyuki Okada, M. Grosse Perdekamp, E. P. Hartouni, Maya Hachiya Shimomura, Y. I. Makdisi, J. Jin, O. Zaudtke, M. Ouchida, M. Issah, H. A. Gustafsson, M. Mitrovski, E. Stenlund, A. A. Vinogradov, V. I. Kochetkov, H. Sakata, A. Kozlov, I. Nakagawa, J. Asai, C. Zhang, M. Virius, E. M. Takagui, Eva Haslum, R. S. Towell, O. Drapier, Frank Ellinghaus, B. Lenzi, M. D. Malik, M. Oka, E. Vznuzdaev, I. Garishvili, Akio Kiyomichi, J. Murata, E. R. Kinney, R. Seto, K. Haruna, S. Yokkaichi, M. J. Tannenbaum, D. P. Morrison, S. Campbell, A. Dion, Jiangyong Jia, Y. Goto, Jan Rak, V. Babintsev, V. E. Semenov, T. A. Shibata, N. N. Ajitanand, M. Wysocki, Viktor Riabov, Shingo Sakai, Atsushi Taketani, A. Enokizono, J. Zimányi, Tatsuya Chujo, N. Kurihara, A. Glenn, R. Lacey, R. Granier de Cassagnac, Gerd Joachim Kunde, I. Shein, D. Mukhopadhyay, S. Rembeczki, G. S. Kyle, A. Hadj Henni, Rushan Han, A. Adare, S. Afanasiev, A. Ster, James Alexander, I. Tserruya, S. Butsyk, Yu. Efremenko, V. Singh, C. Y. Chi, Vladimir Samsonov, K. Boyle, Robert F. Hobbs, Wei Xie, D. Winter, M. P. Comets, J. G. Boissevain, Masashi Kaneta, D. Yu Peressounko, M. K. Lee, C. L. Woody, Takahiro Nakamura, R. Averbeck, Byung-Sik Hong, P. Tarján, Debashish Pal, D. Hornback, M. Heffner, A. Bazilevsky, S. Sawada, C. P. Singh, Alberto Baldisseri, B. M. Johnson, K. Dehmelt, Jen-Chieh Peng, Susumu Oda, J. Ying, A. Franz, A. Durum, A. Taranenko, Kazushi Miki, Philippe Rosnet, C. Pinkenburg, Tamas Ferenc Csorgo, J. L. Nagle, Alexandre Lebedev, D. Isenhower, A. Toia, Dong Jo Kim, Osamu Jinnouchi, O. Dietzsch, E. T. Atomssa, H. Valle, D. M. Lee, A. Isupov, J. Sziklai, Senta Greene, S. F. Pate, M. Stepanov, G. Roche, L. Mašek, Y. J. Mao, T. V. Moukhanova, S. Kametani, I. V. Sourikova, Brian Cole, Anne Marie Sickles, D. E. Fields, B. V. Jacak, B. E. Norman, H. Al-Bataineh, M. Naglis, E. O'Brien, X. R. Wang, J. H. Kang, M. McCumber, E. H. Kim, J. S. Haggerty, S. Esumi, A. Romana, C. L. Silva, I. Ravinovich, W. A. Zajc, V. Baublis, A. Denisov, V. Cianciolo, Masayasu Ishihara, V. Papavassiliou, Sébastien Gadrat, Y. Nagata, Susumu Sato, Sergey Fokin, G. R. Young, T. L. Thomas, L. Aphecetche, T. Horaguchi, Ryugo S. Hayano, Y. Riabov, Y. S. Lai, Kenta Shigaki, K. S. Sim, M. Nguyen, V. Dzhordzhadze, Y. Watanabe, A. S. Nyanin, R. Bennett, J. L. Charvet, H. Hiejima, M. Finger, Y. Fukao, A. Shevel, T. Hester, T. E. Miller, Johannes Peter Wessels, V-N. Tram, F. Matathias, Kensuke Homma, Motoi Inaba, Mate Csanad, P. Chung, P. Constantin, S. Chernichenko, David D'Enterria, M. N. Wagner, W. S. Emam, B. Bassalleck, M. Konno, J. T. Mitchell, R. Seidl, Vladislav Manko, H. Kanou, Taku Gunji, H. Gong, M. Slunečka, J. Seele, F. Kajihara, S. Belikov, H. Delagrange, S. Zhou, C. Vale, B. S. Chang, Christine Angela Aidala, J. Klay, Y. Nakamiya, G. Baksay, K. O. Eyser, A. K. Purwar, K. Fujiwara, K. Imai, C. A. Ogilvie, T. K. Hemmick, Yasuo Miake, H. W. Van Hecke, L. Kochenda, J. Egdemir, Jason Kamin, S. P. Stoll, S. S.E. Rosendahl, G. Bunce, A. Churyn, S. Bathe, D. Jouan, R. Pak, Agneta Oskarsson, N. Kamihara, R. Armendariz, Kazuyoshi Kurita, A. Drees, J. Kubart, Y. Berdnikov, Y. Akiba, M. Mishra, S. Nagamiya, Vaclav Vrba, Klaus Johannes Reygers, A. Kiss, Z. Yasin, Henner Buesching, Steven E. Skutnik, Marcus Hohlmann, H. Qu, Hideki Hamagaki, K. Aoki, G. David, N. Grau, K. Shoji, P. W. Stankus, C. R. Cleven, C. Haegemann, Y. Inoue, R. Vértesi, Dong-Hun Kim, Jason Newby, J. E. Frantz, E. J. Desmond, Charles Maguire, M. Togawa, J. Park, Y. Tsuchimoto, I. E. Yushmanov, E. Kistenev, H. Harada, M. B. Deaton, Y. Tanaka, F. Staley, L. Baksay, H. Pei, K. Nakano, W. E. Sondheim, P. A. Rukoyatkin, John Hill, H. A. Torii, Toru Sugitate, L. D. Isenhower, François Fleuret, and S. Takagi
Subjects: Quantum chromodynamics, Physics, Semileptonic decay, Nuclear and High Energy Physics, Particle physics, Meson, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Hadron, 01 natural sciences, Nuclear physics, Yield (chemistry), 0103 physical sciences, Mass spectrum, High Energy Physics::Experiment, Charm (quantum number), Nuclear Experiment, 010306 general physics, Lepton
Abstract: PHENIX has measured the electron-positron pair mass spectrum from 0 to 8 GeV/c(2) in p + p collisions at root s = 200 GeV. The contributions from light meson decays to e(+)e(-) pairs have been determined based on measurements of hadron production cross sections by PHENIX. Within the systematic uncertainty of similar to 20% they account for all e(+)e(-) pairs in the mass region below similar to 1 GeV/c(2). The e(+)e(-) pair yield remaining after subtracting these contributions is dominated by semileptonic decays of charmed hadrons correlated through flavor conservation. Using the spectral shape predicted by PYTHIA, we estimate the charm production cross section to be 544 +/- 39(stat) +/- 142(syst) +/- 200(model) pb. which is consistent with QCD calculations and measurements of single leptons by PHENIX. (C) 2008 Elsevier BV. All rights reserved.
Published: 2009

29. Correlated production of p and p¯ in Au+Au collisions at sNN=200 GeV

Author: J. Chiba, M. B. Deaton, R. A. Soltz, H. Borel, M. Grosse Perdekamp, Y. Tanaka, T. K. Shea, G. C. Mishra, Takao Sakaguchi, S. Bathe, Agneta Oskarsson, B. Love, Marie Germain, J. L. Charvet, C. R. Cleven, C. Haegemann, Y. Inoue, C. Klein-Boesing, A. D. Frawley, Y. Berdnikov, Y. Akiba, S. Afanasiev, A. Ster, I. Tserruya, A. G. Litvinenko, P. J. Kroon, T. Tabaru, M. Mishra, S. Nagamiya, Kazuhiro Tanaka, J. Newby, G. Roche, T. E. Miller, E. T. Atomssa, S. Esumi, Yu. Efremenko, V. Singh, Dong-Hun Kim, S. H. Aronson, L. Baksay, Vaclav Vrba, Klaus Johannes Reygers, Charles Maguire, P. Chung, Robert F. Hobbs, T. Hester, W. A. Zajc, V. Baublis, M. Issah, Debashish Pal, S. Sawada, A. Kozlov, W. Holzmann, J. Ying, A. Franz, S. Leckey, Josh Moss, E. Kistenev, D. Hornback, M. Heffner, A. Denisov, S. Belikov, K. S. Joo, V. Cianciolo, R. Seto, K. Haruna, M. Mitrovski, Y. L. Yamaguchi, Tadaaki Isobe, Maya Hachiya Shimomura, Y. I. Makdisi, A. Taranenko, Kazushi Miki, M. Wysocki, Sergey Fokin, M. Holmes, M. D. Malik, E. Vznuzdaev, D. Winter, M. P. Comets, D. Yu Peressounko, V. Dzhordzhadze, Hirohiko Sato, Alexei Khanzadeev, H. Harada, H. Pei, J. S. Chai, T. Horaguchi, N. Grau, K. Shoji, A. Kiss, E. Stenlund, J. L. Drachenberg, S. F. Pate, W. S. Emam, P. L. McGaughey, P. Tarján, J. M. Burward-Hoy, B. Komkov, Norio Saito, M. A. L. Leite, S. Batsouli, X. He, Y. Nakamiya, S. K. Tuli, O. O. Omiwade, K. Dehmelt, P. W. Stankus, M. J. Tannenbaum, Marisilvia Donadelli, V. Bumazhnov, Z. Yasin, Henner Buesching, H. Sakata, L. Aphecetche, H. Al-Bataineh, V. Papavassiliou, J. Egdemir, M. Chiu, T. A. Shibata, S. P. Sorensen, V. Peresedov, Y. Le Bornec, K. Hasuko, Steven E. Skutnik, Jason Kamin, M. C. McCain, G. Baksay, V-N. Tram, S. Kelly, N. N. Ajitanand, Dylan Walker, W. C. Smith, Marcus Hohlmann, Andry Malala Rakotozafindrabe, Senta Greene, D. Isenhower, D. Mukhopadhyay, S. Rembeczki, D. Sharma, Jen-Chieh Peng, K. Das, B. Forestier, Jan Rak, Hiroyuki Okada, V. Babintsev, A. P.T. Palounek, S. P. Stoll, A. Toia, L. Mašek, M. T. Bjorndal, Johannes Peter Wessels, B. E. Norman, Minghui Liu, D. Bucher, E. P. Hartouni, H. Masui, A. K. Dubey, Joakim Nystrand, G. S. Kyle, Tae-Yeon Lee, Eva Haslum, B. Lenzi, Martin Purschke, F. Gastineau, H. Qu, R. Granier de Cassagnac, M. K. Lee, Takahiro Nakamura, A. Adare, P. Rosnet, Kenneth Francis Read, Xiong Wang, A. A. Bickley, K. O. Eyser, S. S.E. Rosendahl, G. Bunce, K. Fujiwara, H. A. Gustafsson, Susumu Oda, D. Kotchetkov, T. Shohjoh, H. Kanou, Taku Gunji, H. Gong, L. Tomášek, A. Hadj Henni, A. V. Kazantsev, S. Takagi, Hideki Hamagaki, K. Aoki, G. David, T. V. Moukhanova, C. Zhang, J. Seele, James Alexander, R. Averbeck, Byung-Sik Hong, A. Durum, V. S. Pantuev, A. Bazilevsky, K. N. Barish, F. Kajihara, F. Matathias, Dong Jo Kim, A. Morreale, Osamu Jinnouchi, A. Churyn, Z. Fraenkel, P. Mikeš, Kensuke Homma, E. O'Brien, Catherine Micaela Silvestre, D. S. Brown, Motoi Inaba, J. G. Lajoie, T. Hachiya, H. Delagrange, K. Boyle, D. Jouan, Wei Xie, Yoichiro Fukao, M. Harvey, Roy A. Lacey, R. Vértesi, B. Azmoun, A. Král, M. J. Kweon, S. Chernichenko, H. Lim, Alexandre Lebedev, Viktor Riabov, T. C. Awes, D. M. Lee, B. Bassalleck, Anne Marie Sickles, Junji Tojo, D. E. Fields, S. Zhou, Kyoichiro Ozawa, T. Liška, Mate Csanad, Rushan Han, M. N. Hagiwara, Jun Kikuchi, M. Konno, B. V. Jacak, H. W. Van Hecke, C. A. Ogilvie, M. L. Brooks, I. J. Choi, A. Baldisseri, J. T. Mitchell, A. Kravitz, M. McCumber, A. K. Purwar, K. Okada, M. Oka, Hiroaki Ohnishi, Y. S. Kim, A. Dion, R. Seidl, S. Butsyk, Vladislav Manko, Christophe Pierre Suire, Alexander Milov, T. K. Hemmick, I. Nakagawa, M. Slunečka, Yasuo Miake, Vladimir Samsonov, Atsushi Taketani, A. Enokizono, I. Otterlund, B. Sahlmueller, E. H. Kim, H. En'yo, P. Constantin, M. J. Leitch, O. Drapier, Frank Ellinghaus, G. R. Young, E. R. Kinney, D. P. Morrison, L. Kochenda, N. Willis, C. Vale, T. Kawagishi, S. Campbell, B. S. Chang, Christine Angela Aidala, J. Klay, V. E. Semenov, J. Zimányi, R. Pak, Tamas Ferenc Csorgo, K. S. Sim, J. L. Nagle, Tatsuya Chujo, N. Kamihara, Y. Kwon, R. Armendariz, Xingguo Li, M. Gonin, H. Hiejima, Kazuyoshi Kurita, E. J. Desmond, T. L. Thomas, David D'Enterria, K. Imai, A. Drees, Xiao-yan Li, J. Kubart, H. Pereira, M. Togawa, J. Park, Florian Bauer, Ryugo S. Hayano, R. P. Pisani, Y. Riabov, Y. Tsuchimoto, Kenta Shigaki, M. Nguyen, I. E. Yushmanov, Nikolay Tyurin, A. S. Nyanin, M. N. Wagner, J. E. Frantz, M. Ouchida, J. Asai, Shingo Sakai, C. L. Woody, A. Shevel, D. Lynch, I. V. Sourikova, A. Glenn, V. L. Rykov, T. Dahms, I. Ravinovich, Y. Nagata, A. Deshpande, Y. Watanabe, S. S. Ryu, T. Ichihara, I. Younus, Matthew G. Reuter, A. Soldatov, D. Kawall, K. Tanida, V. I. Kochetkov, Takahiro Fusayasu, J. Murata, R. Bennett, Gerd Joachim Kunde, I. Shein, C. P. Singh, B. M. Johnson, I. D. Ojha, Alexander Malakhov, A. Isupov, Ahmed Al-Jamel, M. Finger, J. Sziklai, D. Silvermyr, Brian Cole, M. Naglis, L. S. Zolin, C. L. Silva, Saskia Mioduszewski, W. J. Park, Masayasu Ishihara, O. Zaudtke, Susumu Sato, F. Staley, M. Virius, P. D. Barnes, A. Yanovich, J. Jin, E. M. Takagui, R. S. Towell, S. Y. Fung, I. Garishvili, Akio Kiyomichi, N. Kurihara, Y. Cobigo, M. G. Hur, C. Y. Chi, John Hill, H. A. Torii, Toru Sugitate, L. D. Isenhower, François Fleuret, S. N. White, K. Nakano, W. E. Sondheim, O. Dietzsch, H. Valle, Y. J. Mao, S. Kametani, P. A. Rukoyatkin, J. H. Kang, Julia Velkovska, J. S. Haggerty, A. Romana, M. Rosati, S. Gadrat, Bruno Espagnon, A. A. Vinogradov, Henrik Tydesjö, Jiangyong Jia, Y. S. Lai, Y. Goto, J. Gosset, J. P. Sullivan, S. Yokkaichi, J. M. Heuser, J. G. Boissevain, Masashi Kaneta, C. Pinkenburg, and M. Stepanov
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Range (particle radiation), Meson, 010308 nuclear & particles physics, Nuclear Theory, High Energy Physics::Phenomenology, Parton, 01 natural sciences, Nuclear physics, Baryon, 0103 physical sciences, High Energy Physics::Experiment, Production (computer science), Nuclear Experiment, 010306 general physics, Sign (mathematics), Bar (unit)
Abstract: Correlations between p and (p) over bar at transverse momenta typical of enhanced baryon production in Au + Au collisions are reported. The PHENIX experiment has measured same and opposite sign baryon pairs in Au + Au collisions at root s(NN) = 200 GeV. Correlated production of p and p with the trigger particle from the range 2.5 < p(T) < 4.0 GeV/c and the associated particle with 1.8 < p(T) < 2.5 GeV/c is observed to be nearly independent of the centrality of the collisions. Same sign pairs show no correlation at any centrality. The conditional yield of mesons triggered by baryons (and anti-baryons) and mesons in the same p(T) range rises with increasing centrality, except for the most central collisions, where baryons show a significantly smaller number of associated mesons. These data are consistent with a picture in which hard scattered partons produce correlated p and (p) over bar in the p(T) region of the baryon excess. (c) 2007 Elsevier B.V. All rights reserved.
Published: 2007

30. Measurements of Elliptic and Triangular Flow in High-MultiplicityHe3+AuCollisions atsNN=200 GeV

Author: H. Themann, Y. Nagata, B. Azmoun, A. Král, M. J. Kweon, Dmitry Blau, V. I. Kochetkov, M. Bai, E. C. Aschenauer, E. J. Desmond, R. S. Towell, J. Murata, I. Garishvili, Akio Kiyomichi, F. Wei, M. Togawa, E. Vazquez-Zambrano, M. Tomášek, J. D. Osborn, Gerd Joachim Kunde, Maya Hachiya Shimomura, Inseok Yoon, Zhiying You, J. Park, R. S. Hollis, R. Bennett, P. Tarján, M. Kawashima, G. S. Kyle, A. Rakotozafindrabe, F. Matathias, Kensuke Homma, N. Kurihara, I. Shein, M. Oka, M. Finger, A. Sen, V. S. Pantuev, P. Kline, K. S. Lee, M. Ouchida, James Alexander, A. V. Kazantsev, E. Richardson, P. Constantin, M. Kasai, N. Means, Sung Keun Park, T. Sumita, C. Y. Chi, Charles Maguire, Y. I. Makdisi, J. Hamblen, J. Asai, T. Sodre, K. Sedgwick, Y. Tsuchimoto, Y. Iwanaga, N. N. Ajitanand, K. S. Sim, R. Averbeck, Byung-Sik Hong, A. Bazilevsky, C. Harper, Mihael Makek, Jongmin Lee, S. Dairaku, S. Hasegawa, I. E. Yushmanov, O. Zaudtke, V. Dzhordzhadze, S. Chernichenko, B. Bassalleck, M. Virius, E. T. Atomssa, P. Liebing, J. D. Orjuela Koop, C. H. Chen, T. Tabaru, A. Manion, K. Okada, N. S. Bandara, S. Butsyk, G. D. N. Perera, S. P. Sorensen, A. Deshpande, Takahiro Nakamura, Shingo Sakai, A. Hadj Henni, D. McGlinchey, Eun-Hee Kim, Susumu Oda, H. En'yo, M. J. Leitch, Junji Tojo, Y. Kwon, M. Konno, L. Tomášek, P. Mikeš, Dylan Walker, M. S. Daugherity, C. P. Singh, M. Beaumier, Philippe Rosnet, Alexandre Lebedev, Kiyoshi Tanida, B. M. Johnson, A. Yu. Semenov, J. Gosset, M. Sarsour, Mate Csanad, A. Iordanova, O. Chvala, A. Durum, J. Bryslawskyj, R. J. Petti, A. Taketani, V. L. Rykov, T. Dahms, Z. Yasin, Henner Buesching, Steve Edwards, K. S. Joo, D. M. Lee, Vladimir Samsonov, Christine Nattrass, T. Todoroki, A. Isupov, C. Suire, Seong H. Kim, S. Y. Han, Senta Greene, Y. Watanabe, J. Sziklai, Catherine Micaela Silvestre, K. Yamaura, A. Meles, C. L. Woody, A. Berdnikov, L. Patel, Beomkyu Kim, Wei Xie, M. Stepanov, L. Guo, Alexei Khanzadeev, J. G. Lajoie, E. Stenlund, R. Yang, H. Hiejima, S. Taneja, Gary Grim, M. Alfred, T. Hachiya, A. Caringi, Y. Nakamiya, D. Lynch, Brian Cole, K. Kiriluk, E. Kistenev, M. K. Lee, X. Gong, I. Younus, M. Kurosawa, T. C. Awes, Kyoichiro Ozawa, T. Liška, C. Baumann, J. B. Choi, H. Sakata, M. Nihashi, A. T. Basye, K. V. Dharmawardane, Petr Gallus, Jennifer E. Perry, D. Danley, Hongfang Liu, J. S. Kang, Jun Kikuchi, Marcus Hohlmann, S. Tarafdar, A. Vossen, K. Imai, Saskia Mioduszewski, G. Baksay, Hai Yu, M. Snowball, A. Kravitz, Dipak Kumar Mishra, David D'Enterria, Tadaaki Isobe, Tamas Ferenc Csorgo, B. E. Norman, J. L. Nagle, B. Fadem, E. O'Brien, D. John, P. Castera, K. R. Andrews, D. E. Fields, Ajit Kumar Mohanty, A. Soldatov, N. Novitzky, T. A. Shibata, C. L. Silva, B. V. Jacak, R. P. Pisani, M. Savastio, L. A. Linden Levy, I. V. Sourikova, H. Iinuma, P. Lichtenwalner, M. J. Tannenbaum, T. Sato, S. Esumi, I. J. Choi, T. L. Thomas, X. Jiang, Hiroaki Ohnishi, K. B. Lee, R. A. Soltz, H. Borel, A. P.T. Palounek, J. H. Bhom, M. McCumber, R. Ichimiya, Tae-Yeon Lee, M. Naglis, H. Nakagomi, T. Hoshino, J. Jin, K. O. Eyser, A. K. Purwar, Eva Haslum, B. Lenzi, Martin Purschke, B. Sahlmueller, Y. J. Kim, K. Fujiwara, Y. Onuki, Ryugo S. Hayano, Y. Riabov, J. Hanks, P. L. McGaughey, B. Xia, S. Afanasiev, Jan Rak, D. Isenhower, A. Toia, O. Dietzsch, H. Valle, T. Moon, Y. L. Yamaguchi, Dipanwita Dutta, C. Gal, L. Aphecetche, M. N. Wagner, Y. Fukao, A. Shevel, Pawan Kumar Netrakanti, D. Broxmeyer, T. Hester, Masayasu Ishihara, J. H. Do, M. Chiu, S. Beckman, C. L. Towell, J. T. Mitchell, H. Torii, B. K. Schmoll, A. Ster, N. Feege, Y. Miyachi, D. Roach, K. M. Kijima, R. Lacey, R. Granier de Cassagnac, A. Morreale, Kenta Shigaki, L. Mašek, M. Nguyen, A. S. Nyanin, A. Adare, B. Kimelman, M. Grosse Perdekamp, S. Mizuno, S. Yokkaichi, Julia Velkovska, M. Rosati, N. Hotvedt, R. Seidl, H. A. Gustafsson, C. Zhang, T. V. Moukhanova, Y. Ikeda, Z. Fraenkel, V. Khachatryan, Hiroyuki Sako, F. Giordano, M. E. Connors, Atsushi Takahara, S. K. Park, K. Hashimoto, Vladislav Manko, F. Staley, Marisilvia Donadelli, V. Bumazhnov, M. P. Comets, Rachid Nouicer, H. W. Van Hecke, A. Dion, L. Zou, M. Slunečka, A. N. Zelenski, M. Proissl, P. Ružička, J. G. Boissevain, V-N. Tram, A. Kim, Jaehyeok Yoo, D. Mukhopadhyay, R. K. Choudhury, N. Grau, Shunji Nishimura, T. Rinn, Masashi Kaneta, A. A. Vinogradov, Xingguo Li, S. W. Nam, R. Vértesi, D. Hornback, E. Tennant, S. Rembeczki, Motoi Inaba, K. A. Drees, S. Belikov, Min Soo Kim, J. L. Charvet, S. Bathe, R. Akimoto, Minghui Liu, M. Gonin, D. Sharma, R. M. Wright, Johannes Peter Wessels, R. Tanabe, D. Layton, B. Komkov, Viktor Riabov, Agneta Oskarsson, M. Heffner, Jiangyong Jia, Y. Goto, H. Harada, C. Pinkenburg, Serpil Yalcin, A. Taranenko, T. Jones, Peter Christiansen, Kazushi Miki, Kenneth Francis Read, Y. Berdnikov, K. Dehmelt, S. H. Lee, Y. Akiba, K. Karatsu, J. Ben-Benjamin, T. E. Miller, T. Horaguchi, Brajesh K. Singh, J. Sun, D. Winter, D. Yu Peressounko, C. Vale, C. McKinney, W. C. Chang, A. Sukhanov, K. Kurita, M. Mishra, S. Nagamiya, G. Roche, B. S. Chang, Y. J. Mao, S. Kametani, Y. Hori, Anne Marie Sickles, Aaron Angerami, H. Pereira, Dennis Perepelitsa, J. Klatsky, A. Timilsina, Christine Angela Aidala, Tsutomu Mibe, M. I. Nagy, Vaclav Vrba, Klaus Johannes Reygers, J. Klay, M. A. L. Leite, Kei Nagashima, Rui Wei, B. Schaefer, A. Enokizono, H. Pei, Y. Morino, J. H. Kang, J. S. Haggerty, S. R. Lee, A. Romana, G. W. Kim, J. S. Bok, P. Chung, K. Utsunomiya, D. Watanabe, H. H. Shim, D. Kleinjan, S. Campbell, Rushan Han, S. H. Lim, J. Imrek, D. Kotchetkov, Raphael Noel Tieulent, W. A. Zajc, Jason Newby, Eric Appelt, C. O. Kim, M. D. Malik, L. Xue, J. Chiba, E. Vznuzdaev, Alice Mignerey, Susumu Sato, W. S. Emam, A. Datta, K. Das, J. E. Frantz, H. Asano, R. Pak, H. Kanou, R. Belmont, J. S. Kapustinsky, Jong-Min Park, M. B. Deaton, E. P. Hartouni, G. R. Young, V. Baublis, A. Denisov, Yuki Watanabe, V. Babintsev, Su Houng Lee, Y. S. Lai, V. Cianciolo, Taku Gunji, H. Gong, J. Seele, M. Patel, Y. Tanaka, L. D'Orazio, S. Miyasaka, Y. Tomita, E. Mannel, F. Kajihara, Nagahiro Saito, T. Novák, H. Delagrange, Sergey Fokin, H. J. Moon, L. Baksay, S. Zhou, A. Baldisseri, S. D. Rolnick, Takao Sakaguchi, C. Klein-Boesing, A. D. Frawley, A. S. White, S. Huang, S. H. Aronson, W. Holzmann, H. F. Hamilton, P. Sett, M. Mitrovski, Takafumi Niida, J. Huang, J. S. Yoo, M. K. Dayananda, Prakhar Garg, B. Bannier, T. Murakami, Robert F. Hobbs, Yi Gu, E. M. Takagui, Debashish Pal, S. Sawada, J. Ying, A. Franz, C. M. Camacho, Prashant Shukla, S. F. Pate, Ke. Nakamura, H. Al-Bataineh, J. A. Key, Alexander Milov, I. Nakagawa, Young-Ki Kim, T. Engelmore, S. Motschwiller, O. Drapier, Frank Ellinghaus, D. Ivanishchev, E. R. Kinney, D. P. Morrison, V. Papavassiliou, Sébastien Gadrat, B. H. Kang, V. E. Semenov, H. Al-Ta'Ani, Tatsuya Chujo, Jen-Chieh Peng, J. G. Rubin, D. Reynolds, Inkyu Park, Xiong Wang, Z. Conesa del Valle, Dong Jo Kim, S. Takagi, M. Wysocki, I. Tserruya, M. Jezghani, Yu. Efremenko, V. Singh, T. Koblesky, K. N. Barish, A. Glenn, Eunja Kim, S. Sano, N. Kamihara, X. He, J. Zimamyi, O. O. Omiwade, R. Armendariz, Byoungchoo Park, Y. Aramaki, N. Apadula, V. Peresedov, Z. Rowan, M. Mendoza, M. L. Brooks, C. Oakley, A. Drees, Steven E. Skutnik, S. N. White, Deepa Thomas, J. Kubart, J. Koster, K. Sakashita, T. O. S. Haseler, H. Qu, P. B. Diss, Zvi Hirsh Citron, D. Kotov, S. Batsouli, H. Masui, A. K. Dubey, H. Ge, K. Nakano, Hideki Hamagaki, K. Aoki, G. David, K. I. Hahn, J. Egdemir, A. A. Bickley, D. S. Jumper, Jason Kamin, A. Veicht, A. Mwai, W. E. Sondheim, B. Love, P. Montuenga, S. P. Stoll, C. R. Cleven, C. Haegemann, Y. Inoue, K. Boyle, P. A. Rukoyatkin, T. Ichihara, T. Kempel, Dong-Hun Kim, S. Kaneti, Osamu Jinnouchi, S. S.E. Rosendahl, A. G. Litvinenko, G. Bunce, Matthew G. Reuter, Takahiro Fusayasu, K. Watanabe, Alexander Malakhov, K. Shoji, A. Churyn, R. Kitamura, D. Silvermyr, S. Kanda, P. W. Stankus, L. S. Zolin, D. Jouan, A. Sexton, W. J. Park, Christopher Rosen, A. Kozlov, P. D. Barnes, A. Yanovich, R. Seto, K. Haruna, B. Meredith, C. A. Ogilvie, T. K. Hemmick, B. J. Ramson, John Hill, J. M. Durham, Yasuo Miake, Toru Sugitate, L. D. Isenhower, I. Danchev, K. DeBlasio, L. Kochenda, M. Issah, R. Pinson, François Fleuret, I. Ravinovich, and D. Kawall
Subjects: Nuclear physics, Physics, Pseudorapidity, Elliptic flow, Hadron, General Physics and Astronomy, Rapidity, Multiplicity (mathematics), Nuclear Experiment, Nucleon, Glauber, Charged particle
Abstract: We present the first measurement of elliptic ($v_2$) and triangular ($v_3$) flow in high-multiplicity $^{3}$He$+$Au collisions at $\sqrt{s_{_{NN}}}=200$ GeV. Two-particle correlations, where the particles have a large separation in pseudorapidity, are compared in $^{3}$He$+$Au and in $p$$+$$p$ collisions and indicate that collective effects dominate the second and third Fourier components for the correlations observed in the $^{3}$He$+$Au system. The collective behavior is quantified in terms of elliptic $v_2$ and triangular $v_3$ anisotropy coefficients measured with respect to their corresponding event planes. The $v_2$ values are comparable to those previously measured in $d$$+$Au collisions at the same nucleon-nucleon center-of-mass energy. Comparison with various theoretical predictions are made, including to models where the hot spots created by the impact of the three $^{3}$He nucleons on the Au nucleus expand hydrodynamically to generate the triangular flow. The agreement of these models with data may indicate the formation of low-viscosity quark-gluon plasma even in these small collision systems.
Published: 2015

31. Systematic study of azimuthal anisotropy in Cu + Cu and Au + Au collisions atsNN=62.4and 200 GeV

Author: F. Matathias, Kensuke Homma, S. Chernichenko, H. Lim, B. Bassalleck, M. Konno, Tadaaki Isobe, J. S. Chai, P. L. McGaughey, Y. Nakamiya, D. Lynch, G. Baksay, B. Forestier, M. T. Bjorndal, B. Sahlmueller, J. T. Mitchell, R. Seidl, Vladislav Manko, M. Slunečka, C. Vale, B. S. Chang, J. Klay, P. Rosnet, O. Dietzsch, S. Afanasiev, A. Ster, K. O. Eyser, K. Fujiwara, H. Valle, J. Newby, G. Roche, Julia Velkovska, J. Chiba, T. Ichihara, D. Hornback, V. S. Pantuev, A. Taranenko, H. W. Van Hecke, G. C. Mishra, Takao Sakaguchi, Kazushi Miki, M. Harvey, J. L. Drachenberg, C. Klein-Boesing, Osamu Jinnouchi, Takahiro Fusayasu, I. D. Ojha, J. G. Boissevain, Masashi Kaneta, Alexander Malakhov, H. Pei, A. D. Frawley, D. Silvermyr, Y. Fukao, A. Shevel, K. Hasuko, D. Kawall, L. S. Zolin, W. J. Park, K. Okada, S. P. Sorensen, M. Gonin, C. Pinkenburg, S. Huang, S. H. Aronson, V. I. Kochetkov, M. Rosati, Tamás Csörgő, Dylan Walker, T. Hester, H. En'yo, P. D. Barnes, A. Yanovich, B. Love, Joakim Nystrand, P. Constantin, M. J. Leitch, Eva Haslum, B. Lenzi, M. Stepanov, W. Holzmann, Marie Germain, J. Murata, Bruno Espagnon, A. A. Vinogradov, Henrik Tydesjö, Maya Hachiya Shimomura, A. G. Litvinenko, J. Gosset, S. N. White, Jiangyong Jia, Y. Goto, J. P. Sullivan, Y. I. Makdisi, Gerd Joachim Kunde, I. Shein, G. S. Kyle, J. M. Burward-Hoy, Alexei Khanzadeev, A. Kozlov, R. Seto, V-N. Tram, K. Nakano, E. Stenlund, K. Haruna, James Alexander, H. Sakata, Charles Maguire, W. C. Smith, S. Leckey, W. E. Sondheim, C. L. Woody, M. J. Tannenbaum, Motoi Inaba, R. Averbeck, Byung-Sik Hong, S. Yokkaichi, J. M. Heuser, V. Dzhordzhadze, Robert F. Hobbs, X. He, Alberto Baldisseri, A. Deshpande, C. P. Singh, A. Bazilevsky, K. Das, K. Boyle, P. A. Rukoyatkin, Mate Csanad, M. K. Lee, I. Tserruya, Y. J. Mao, O. O. Omiwade, S. Y. Fung, Josh Moss, D. Mukhopadhyay, Yu. Efremenko, S. Kametani, V. Peresedov, Robert Vertesi, Y. Le Bornec, B. M. Johnson, E. P. Hartouni, S. Rembeczki, J. G. Lajoie, V. Singh, Alexandre Lebedev, Kiyoshi Tanida, J. H. Kang, D. Bucher, D. M. Lee, Steven E. Skutnik, J. S. Haggerty, A. Romana, T. Hachiya, A. Kiss, A. Isupov, Y. Watanabe, E. Kistenev, John Hill, Anne Marie Sickles, David D'Enterria, I. V. Sourikova, S. Butsyk, H. A. Torii, Toru Sugitate, T. L. Thomas, L. D. Isenhower, Y. L. Yamaguchi, S. Gadrat, H. Masui, A. K. Dubey, J. Sziklai, A. A. Bickley, Minghui Liu, T. V. Moukhanova, Vladimir Samsonov, B. Komkov, I. Younus, Ryugo S. Hayano, S. Takagi, I. Otterlund, S. Bathe, Norio Saito, T. Todoroki, H. Harada, Z. Yasin, Hirohiko Sato, S. K. Tuli, Henner Buesching, M. A. L. Leite, Y. Riabov, Brian Cole, M. Heffner, K. N. Barish, R. P. Pisani, Kenneth Francis Read, Kenta Shigaki, A. Soldatov, Debashish Pal, M. Nguyen, G. R. Young, H. Qu, François Fleuret, R. S. Towell, M. B. Deaton, A. S. Nyanin, Christophe Pierre Suire, Alexander Milov, I. Garishvili, Akio Kiyomichi, S. Sawada, Y. S. Lai, S. Batsouli, Rachid Nouicer, Nikolay Tyurin, I. J. Choi, A. Kravitz, I. Nakagawa, A. V. Kazantsev, M. Naglis, Hideki Hamagaki, K. Aoki, G. David, N. Kurihara, Frank Ellinghaus, Y. Tanaka, V. Babintsev, C. L. Silva, B. Azmoun, J. Ying, E. R. Kinney, K. S. Sim, D. P. Morrison, T. K. Shea, S. Campbell, A. Král, M. J. Kweon, L. Tomášek, A. Franz, M. N. Wagner, Marcus Hohlmann, J. L. Nagle, M. L. Brooks, V. E. Semenov, Junji Tojo, Y. Kwon, P. Mikeš, M. Reuter, H. Iinuma, M. C. McCain, J. Zimányi, Masayasu Ishihara, Tatsuya Chujo, Torsten Dahms, K. Dehmelt, M. G. Hur, C. Y. Chi, H. Hiejima, Jen-Chieh Peng, Susumu Sato, F. Staley, L. Baksay, E. J. Desmond, N. Grau, A. P.T. Palounek, M. Oka, Xiao-yan Li, K. Shoji, K. Imai, Marisilvia Donadelli, V. Bumazhnov, T. C. Awes, Kyoichiro Ozawa, T. Liška, A. Dion, M. Togawa, Jun Kikuchi, Saskia Mioduszewski, Jan Rak, P. W. Stankus, J. Park, R. Lacey, K. Kurita, A. Enokizono, H. Pereira, Florian Bauer, W. A. Zajc, S. Kelly, R. Granier de Cassagnac, A. Adare, V. Baublis, S. Belikov, K. S. Joo, N. Kamihara, A. Rakotozafindrabe, N. N. Ajitanand, A. Denisov, V. Cianciolo, J. Jin, E. M. Takagui, Sergey Fokin, Y. Tsuchimoto, J. E. Frantz, Laurent Bernard Aphecetche, Herve Borel, A. Glenn, A. Taketani, V. L. Rykov, O. Zaudtke, M. Virius, Takahiro Nakamura, R. Armendariz, T. Horaguchi, C. R. Cleven, C. Haegemann, Y. Inoue, Rushan Han, M. N. Hagiwara, S. Esumi, D. Sharma, Y. Cobigo, I. Ravinovich, Susumu Oda, I. E. Yushmanov, Tae-Yeon Lee, Martin Purschke, C. A. Aidala, F. Gastineau, Y. Nagata, P. J. Kroon, T. Shohjoh, A. Durum, A. Drees, Dong-Hun Kim, H. A. Gustafsson, S. S. Ryu, Eun-Hee Kim, Catherine Micaela Silvestre, Agneta Oskarsson, D. Kotchetkov, D. S. Brown, C. Zhang, R. Bennett, A. Morreale, Ahmed Al-Jamel, J. Kubart, M. Finger, Z. Fraenkel, Y. Berdnikov, Viktor Riabov, M. Ouchida, Y. Akiba, R. Pak, S. F. Pate, M. Mishra, S. Nagamiya, J. Asai, Kazuhiro Tanaka, O. Drapier, J. Egdemir, H. Al-Bataineh, D. E. Fields, B. V. Jacak, M. McCumber, A. K. Purwar, Jason Kamin, Vaclav Vrba, Klaus Johannes Reygers, S. P. Stoll, V. Papavassiliou, Shingo Sakai, M. Mitrovski, M. Wysocki, S. S.E. Rosendahl, G. Bunce, A. Churyn, D. Jouan, Johannes Peter Wessels, C. A. Ogilvie, T. K. Hemmick, Yasuo Miake, L. Kochenda, M. Issah, T. Kawagishi, Hiroaki Ohnishi, M. D. Malik, E. Vznuzdaev, N. Willis, A. Hadj Henni, Wei Xie, Xingguo Li, R. A. Soltz, M. Grosse Perdekamp, D. Winter, M. P. Comets, D. Yu Peressounko, P. Tarján, T. Tabaru, Senta Greene, B. E. Norman, E. O'Brien, Xiong Wang, Dong Jo Kim, M. Chiu, T. A. Shibata, D. Isenhower, A. Toia, L. Mašek, J. L. Charvet, T. E. Miller, E. T. Atomssa, P. Chung, M. Holmes, W. S. Emam, H. Kanou, Taku Gunji, H. Gong, J. Seele, F. Kajihara, H. Delagrange, S. Zhou, and Y. S. Kim
Subjects: Quark, Physics, Nuclear and High Energy Physics, Particle physics, Angular momentum, Quantitative Biology::Neurons and Cognition, Hadron, Kinetic energy, Particle identification, Nuclear physics, High Energy Physics::Experiment, Impact parameter, Nuclear Experiment, Anisotropy, Energy (signal processing)
Abstract: We have studied the dependence of azimuthal anisotropy $v_2$ for inclusive and identified charged hadrons in Au$+$Au and Cu$+$Cu collisions on collision energy, species, and centrality. The values of $v_2$ as a function of transverse momentum $p_T$ and centrality in Au$+$Au collisions at $\sqrt{s_{_{NN}}}$=200~GeV and 62.4~GeV are the same within uncertainties. However, in Cu$+$Cu collisions we observe a decrease in $v_2$ values as the collision energy is reduced from 200 to 62.4~GeV. The decrease is larger in the more peripheral collisions. By examining both Au$+$Au and Cu$+$Cu collisions we find that $v_2$ depends both on eccentricity and the number of participants, $N_{\rm part}$. We observe that $v_2$ divided by eccentricity ($\varepsilon$) monotonically increases with $N_{\rm part}$ and scales as ${N_{\rm part}^{1/3}}$. The Cu$+$Cu data at 62.4 GeV falls below the other scaled $v_{2}$ data. For identified hadrons, $v_2$ divided by the number of constituent quarks $n_q$ is independent of hadron species as a function of transverse kinetic energy $KE_T=m_T-m$ between $0.1
Published: 2015

32. A GEANT-Based Model for Single Event Upsets in SRAM FPGAs for Use in On-Detector Electronics

Author: J. G. Lajoie and Steven E. Skutnik
Subjects: Physics, Nuclear and High Energy Physics, business.industry, Detector, Upset, Computer Science::Hardware Architecture, Radiation flux, Nuclear Energy and Engineering, Single event upset, Nuclear electronics, Electronic engineering, Static random-access memory, Electrical and Electronic Engineering, Nuclear Experiment, business, Field-programmable gate array, Relativistic Heavy Ion Collider, Computer hardware
Abstract: A model is developed to calculate expected Single Event Upset rates in Xilinx's line of radiation-hardened field programmable gate array (FPGA) offerings for the radiation environment at the PHENIX experiment on the Relativistic Heavy Ion Collider at Brookhaven National Laboratory. The results of this model are compared to an experiment carried out at PHENIX, where actual upset data was obtained. Specific attention is given to unique features of the model, including major sources of "secondary" radiation flux
Published: 2006

33. PHENIX on-line systems

Author: N. Ericson, Athanasios Petridis, X. He, S. Lin, C.L. Britton, Minghui Liu, A. Moore, Kenneth Francis Read, Yu. Efremenko, Yoshio Arai, D. E. Fields, F. Barta, Brian Cole, T. Ushiroda, B. V. Jacak, Sebastian N. White, S. Belikov, M.S. Musrock, H.D. Skank, J. Gannon, J. S. Kapustinsky, F. Heistermann, K. Ebisu, T. A. Carey, M. J. Bennett, C. Y. Chi, M. Lenz, P. Steinberg, H. Wang, M. Tamai, E. Kistenev, John Hill, K. Oyama, S. Boose, Hirohiko Sato, A.L. Wintenberg, T. C. Awes, S. S. Adler, Graham H. Turner, T. Matsumoto, Hiroaki Ohnishi, Jun Kikuchi, W. C. Chang, J. Mead, J. G. Boissevain, L. Paffrath, Jack Fried, S. Markacs, Toru Sugitate, K. El Chenawi, F Matathias, K. Katou, W. Sippach, E. J. Desmond, G. R. Young, Joakim Nystrand, T. Shiina, P. Giannotti, J.W. Walker, Agneta Oskarsson, R. Gentry, Kensuke Homma, R. Seto, J Velkovska, H. Hara, W.D. Thomas, G. C. Mishra, David Olle Rickard Silvermyr, S. Hahn, M. Hibino, Martin Purschke, C. Witzig, Michael L. Simpson, M. Van Lith, M Allen, Sean A. Kelly, P. Constantin, K. N. Barish, F. Plasil, J. Halliwell, R. Rao, F. Toldo, S. S. Ryu, D. Kotchetkov, T. Plagge, Yongsun Kim, P. W. Stankus, Takao Sakaguchi, W. Von Achen, S. Kametani, G.A. Sleege, George Davey Smith, W. A. Zajc, A. D. Frawley, Lennart Osterman, M.S. Emery, J. Harder, W. Lenz, A. Kandasamy, J. H. Kang, J. S. Haggerty, Y. Tanaka, R.A. Todd, Steven E. Skutnik, V.S Pantuev, W.L. Bryan, S. Y. Kim, Wei Xie, R. Amirikas, V. Cianciolo, Paul O'Connor, E. O'Brien, A. G. Hansen, H. Cunitz, M.M. Cafferty, L. Zhang, L. Wood, J. E. Frantz, M Muniruzzamann, J. Simon-Gillo, Y. Kamyshkov, Hideki Hamagaki, D. Engo, Melissa C. Smith, C.E Pancake, K Kurita, J Jia, Xingguo Li, K.C. Cook, Atsushi Taketani, J. P. Sullivan, Jason Newby, T.F. Gee, S. Batsouli, M. Rau, H. W. Van Hecke, A. Franz, M. Bobrek, L. Villatte, J. L. Nagle, J. G. Lajoie, L. Britton, H. A. Gustafsson, U. Jagadish, R. P. Pisani, R. E. Mischke, C. Zhang, S. Rankowitz, G.T. Alley, F. Kajihara, M. Chiu, B. K. Nandi, T. K. Hemmick, M.A. Kelley, and S.S. Frank
Subjects: Physics, Nuclear and High Energy Physics, Data processing, Data collection, Event (computing), business.industry, Network packet, Detector, Front and back ends, Data acquisition, Line (text file), business, Instrumentation, Computer hardware
Abstract: The PHENIX On-Line system takes signals from the Front End Modules (FEM) on each detector subsystem for the purpose of generating events for physics analysis. Processing of event data begins when the Data Collection Modules (DCM) receive data via fiber-optic links from the FEMs. The DCMs format and zero suppress the data and generate data packets. These packets go to the Event Builders (EvB) that assemble the events in final form. The Level-1 trigger (LVL1) generates a decision for each beam crossing and eliminates uninteresting events. The FEMs carry out all detector processing of the data so that it is delivered to the DCMs using a standard format. The FEMs also provide buffering for LVL1 trigger processing and DCM data collection. This is carried out using an architecture that is pipelined and deadtimeless. All of this is controlled by the Master Timing System (MTS) that distributes the RHIC clocks. A Level-2 trigger (LVL2) gives additional discrimination. A description of the components and operation of the PHENIX On-Line system is given and the solution to a number of electronic infrastructure problems are discussed.
Published: 2003

34. Measurement ofKS0andK*0inp+p,d+Au, and Cu + Cu collisions atsNN=200 GeV

Author: P. Sett, Jen-Chieh Peng, J. G. Rubin, Martin Purschke, C. A. Aidala, C. Baumann, Y. Ikeda, D. Reynolds, S. Dairaku, M. Mitrovski, Takafumi Niida, Inkyu Park, J. G. Boissevain, M. S. Daugherity, C. P. Singh, Xiong Wang, C. Silvestre, Serpil Yalcin, D. Kotchetkov, Pawan Kumar Netrakanti, Z. Conesa del Valle, M. K. Dayananda, Masashi Kaneta, B. M. Johnson, O. Zaudtke, Dong Jo Kim, A. Morreale, Prakhar Garg, Z. Fraenkel, B. Bannier, V. Khachatryan, R. Akimoto, M. Virius, E. T. Atomssa, R. J. Petti, A. Isupov, C. Suire, Aaron Angerami, R. A. Soltz, R. K. Choudhury, C. Pinkenburg, Marisilvia Donadelli, S. Campbell, J. D. Orjuela Koop, G. S. Kyle, A. Veicht, K. Dehmelt, C. H. Chen, J. Sziklai, G. Roche, James Alexander, C. L. Woody, A. Berdnikov, V. Bumazhnov, M. P. Comets, D. Black, Y. J. Mao, S. Kametani, W. A. Zajc, L. Xue, V. Baublis, A. Denisov, Yuki Watanabe, M. Wysocki, M. Vargyas, A. Manion, Brian Cole, J. H. Kang, T. L. Thomas, Sung Keun Park, M. Grosse Perdekamp, F. Giordano, M. E. Connors, V. Cianciolo, B. Meredith, B. Azmoun, Ryugo S. Hayano, Y. Riabov, J. S. Haggerty, A. Caringi, A. Romana, A. Král, Kenta Shigaki, M. J. Kweon, I. Ravinovich, R. Averbeck, Byung-Sik Hong, M. Nguyen, A. S. Nyanin, Rachid Nouicer, Min Soo Kim, A. N. Zelenski, R. Tanabe, M. Proissl, V. S. Pantuev, Sergey Fokin, Petr Gallus, Y. Nagata, M. Gonin, N. N. Ajitanand, A. Bazilevsky, Atsushi Takahara, A. J. Miller, T. Horaguchi, Philippe Rosnet, Y. S. Lai, M. Rosati, R. S. Towell, Prashant Shukla, S. F. Pate, T. Ichihara, Osamu Jinnouchi, Matthew G. Reuter, Takahiro Fusayasu, M. Oka, P. Kline, K. S. Lee, Alexander Milov, I. Nakagawa, Young-Ki Kim, T. Engelmore, N. Novitzky, G. D. N. Perera, Takahiro Nakamura, A. Sukhanov, K. Kurita, H. Pereira, Y. Morino, Gary Grim, K. V. Dharmawardane, K. A. Drees, J. L. Charvet, Alexandre Lebedev, D. M. Lee, Maya Hachiya Shimomura, R. S. Hollis, Y. I. Makdisi, P. Liebing, I. V. Sourikova, O. Drapier, Frank Ellinghaus, E. R. Kinney, D. McGlinchey, Susumu Oda, C. O. Kim, M. Bai, I. Garishvili, Akio Kiyomichi, F. Wei, J. Gosset, H. Iinuma, A. P.T. Palounek, A. A. Vinogradov, Ke. Nakamura, M. Beaumier, K. S. Joo, D. P. Morrison, H. Al-Bataineh, J. A. Key, S. P. Sorensen, S. K. Park, Dylan Walker, A. Durum, J. Klatsky, O. Chvala, X. He, O. O. Omiwade, J. Hamblen, T. E. Miller, Alexander Malakhov, K. Kihara, V. E. Semenov, J. Zimányi, Tatsuya Chujo, Y. Onuki, K. Yamaura, S. Yokkaichi, J. G. Lajoie, H. A. Gustafsson, A. Hadj Henni, M. Alfred, T. Hachiya, M. Ouchida, N. Means, J. Asai, S. Whitaker, Shingo Sakai, Inseok Yoon, Zhiying You, R. Bennett, M. Kawashima, N. Kurihara, J. Bryslawskyj, Jennifer E. Perry, Jiangyong Jia, Y. Goto, D. Kleinjan, D. Ivanishchev, T. Jones, I. Tserruya, Peter Christiansen, D. Winter, S. Afanasiev, A. Ster, N. Feege, Y. Aramaki, V. Peresedov, Jan Rak, R. Lacey, C. Zhang, M. Jezghani, Yu. Efremenko, S. Esumi, P. Ružička, R. Granier de Cassagnac, D. Silvermyr, J. Koster, R. Ichimiya, A. Kravitz, A. Adare, A. Enokizono, M. Finger, Hiroaki Ohnishi, Jongmin Lee, D. Yu Peressounko, Viktor Riabov, V. Papavassiliou, Sébastien Gadrat, J. Newby, Beomkyu Kim, Wei Xie, T. Sumita, A. V. Kazantsev, C. Y. Chi, T. Murakami, K. Okada, K. Das, Hongfang Liu, D. E. Fields, S. Batsouli, H. Masui, A. K. Dubey, V. Singh, Y. Fukao, A. Shevel, Rushan Han, B. Komkov, E. P. Hartouni, Herve Borel, D. Lynch, M. J. Tannenbaum, O. Dietzsch, L. S. Zolin, Robert F. Hobbs, W. J. Park, P. Tarján, H. En'yo, M. J. Leitch, B. V. Jacak, P. Chung, A. A. Bickley, A. Mwai, B. Love, L. Ding, Y. Nakamiya, A. Taketani, H. Valle, M. Kofarago, I. J. Choi, B. Xia, Dipanwita Dutta, Christopher Rosen, M. Kurosawa, T. Koblesky, D. Hornback, N. S. Bandara, S. Butsyk, K. S. Sim, V. Dzhordzhadze, Saskia Mioduszewski, P. D. Barnes, A. Yanovich, M. Naglis, Dennis Perepelitsa, D. Roach, K. M. Kijima, M. McCumber, T. Tabaru, C. Gal, V. L. Rykov, T. Dahms, A. G. Litvinenko, Junji Tojo, Y. Kwon, Vladimir Samsonov, Julia Velkovska, T. Hester, H. Torii, B. K. Schmoll, Debashish Pal, S. Sawada, M. Towell, J. Ying, A. Franz, Tsutomu Mibe, H. Nakagomi, T. Hoshino, Y. Gu, M. A. L. Leite, R. Yang, H. Hiejima, A. Taranenko, Senta Greene, Christine Nattrass, T. Todoroki, N. Riveli, A. Sexton, Xingguo Li, S. Taneja, L. Tomášek, A. T. Basye, B. E. Norman, Susumu Sato, W. S. Emam, A. Datta, Kazushi Miki, S. J. Jeon, B. Fadem, E. O'Brien, P. Mikeš, H. Asano, K. B. Lee, J. Hanks, Tamas Ferenc Csorgo, A. Kozlov, R. Seto, K. Haruna, K. Imai, D. Sharma, M. I. Nagy, D. Watanabe, A. Kim, D. Mukhopadhyay, Brajesh K. Singh, S. Rembeczki, J. Jin, K. Karatsu, E. M. Takagui, S. H. Lim, J. L. Nagle, I. Danchev, S. Takagi, K. N. Barish, A. Glenn, Anne Marie Sickles, B. Schaefer, E. Joo, M. D. Malik, E. Vznuzdaev, Eunja Kim, Masayasu Ishihara, M. Stepanov, L. Patel, John Hill, M. K. Lee, J. S. Bok, T. C. Awes, Ajit Kumar Mohanty, Hari Guragain, G. Baksay, S. Sano, R. Belmont, J. S. Kapustinsky, L. Aphecetche, H. Ozaki, T. A. Shibata, C. L. Silva, J. S. Kang, Toru Sugitate, G. R. Young, S. Tarafdar, J. H. Do, M. L. Brooks, T. Sato, Kyoichiro Ozawa, T. Liška, A. Dion, Jun Kikuchi, L. D. Isenhower, V. Babintsev, Tadaaki Isobe, Johannes Peter Wessels, Eva Haslum, B. Lenzi, J. Chiba, Alice Mignerey, L. D'Orazio, S. Miyasaka, François Fleuret, X. Jiang, P. L. McGaughey, Z. Rowan, M. Mendoza, S. N. White, M. Chiu, Deepa Thomas, A. Meles, V-N. Tram, S. Beckman, Hiroyuki Sako, N. Grau, S. W. Nam, D. Kawall, Takao Sakaguchi, A. Sen, M. Leitgab, D. Isenhower, Minghui Liu, C. Klein-Boesing, A. D. Frawley, M. Heffner, Kenneth Francis Read, H. Themann, Motoi Inaba, V. I. Kochetkov, R. M. Wright, A. Toia, T. Moon, M. Sarsour, Mate Csanad, A. Iordanova, S. Y. Han, L. Mašek, S. Huang, J. Murata, S. H. Aronson, Gerd Joachim Kunde, M. Nihashi, I. Shein, W. Holzmann, David D'Enterria, H. Kanou, Taku Gunji, H. Gong, J. Seele, K. Sedgwick, R. P. Pisani, M. Patel, F. Kajihara, Alberto Baldisseri, Mihael Makek, A. Deshpande, B. Sahlmueller, H. Delagrange, M. N. Wagner, S. Zhou, Y. J. Kim, Y. Watanabe, J. T. Mitchell, S. D. Rolnick, I. Younus, R. Seidl, Vladislav Manko, A. Soldatov, M. Slunečka, S. Hasegawa, A. Kiss, S. Belikov, Z. Yasin, Henner Buesching, Steve Edwards, Marcus Hohlmann, C. Vale, L. A. Linden Levy, B. S. Chang, A. Timilsina, J. Klay, K. O. Eyser, A. K. Purwar, K. Fujiwara, Y. L. Yamaguchi, F. Matathias, Kensuke Homma, E. Richardson, S. Mizuno, P. Constantin, S. Chernichenko, B. Bassalleck, M. Konno, H. W. Van Hecke, S. Bathe, Agneta Oskarsson, Y. Berdnikov, S. Wolin, R. Pak, S. H. Lee, Y. Akiba, C. McKinney, M. Mishra, S. Nagamiya, Vaclav Vrba, Klaus Johannes Reygers, N. Kamihara, Rui Wei, R. Armendariz, N. Apadula, C. Oakley, A. Drees, Y. Imazu, J. Kubart, Steven E. Skutnik, H. Qu, Hideki Hamagaki, K. Aoki, G. David, K. I. Hahn, K. Watanabe, C. A. Ogilvie, K. Shoji, M. Tomášek, T. K. Hemmick, P. W. Stankus, J. M. Durham, Yasuo Miake, P. Montuenga, C. R. Cleven, K. DeBlasio, L. Kochenda, M. Issah, C. Haegemann, Y. Inoue, T. Kempel, R. Pinson, K. Sakashita, D. Kotov, J. Egdemir, D. S. Jumper, Charles Maguire, Jason Kamin, S. P. Stoll, Kiyoshi Tanida, E. Kistenev, P. Lichtenwalner, H. Harada, J. Sun, H. Pei, S. S.E. Rosendahl, G. Bunce, H. J. Kim, A. Churyn, M. B. Deaton, D. Jouan, Y. Tanaka, E. Mannel, Nagahiro Saito, H. J. Moon, F. Staley, L. Baksay, R. Vértesi, J. E. Frantz, Dmitry Blau, E. J. Desmond, M. Togawa, E. Vazquez-Zambrano, J. Park, A. Rakotozafindrabe, M. Kasai, Y. Tsuchimoto, Y. Iwanaga, I. E. Yushmanov, Eun-Hee Kim, Alexei Khanzadeev, E. Stenlund, J. B. Choi, H. Sakata, Dipak Kumar Mishra, D. H. Kim, J. H. Bhom, T. V. Moukhanova, Zvi Hirsh Citron, H. Ge, K. Nakano, W. E. Sondheim, D. Ivanischev, K. Boyle, P. A. Rukoyatkin, and Tae-Yeon Lee
Subjects: Physics, Quark, Nuclear and High Energy Physics, Meson, Nuclear Theory, Strangeness, Phi meson, Baryon, Nuclear physics, Deuterium, High Energy Physics::Experiment, Impact parameter, Nuclear Experiment, Relativistic Heavy Ion Collider
Abstract: The PHENIX experiment at the Relativistic Heavy Ion Collider has performed a systematic study of K-S(0) and K*(0) meson production at midrapidity in p + p, d + Au, and Cu + Cu collisions at root s(NN) = 200 GeV. The K-S(0) and K*(0) mesons are reconstructed via their K-S(0) -> pi(0)(-> gamma gamma) pi(0)(-> gamma gamma) and K*(0) -> K-+/-pi(-/+) decay modes, respectively. The measured transverse-momentum spectra are used to determine the nuclear modification factor of K-S(0) and K*(0) mesons in d + Au and Cu + Cu collisions at different centralities. In the d + Au collisions, the nuclear modification factor of K-S(0) and K*(0) mesons is almost constant as a function of transverse momentum and is consistent with unity, showing that cold-nuclear-matter effects do not play a significant role in the measured kinematic range. In Cu + Cu collisions, within the uncertainties no nuclear modification is registered in peripheral collisions. In central collisions, both mesons show suppression relative to the expectations from the p + p yield scaled by the number of binary nucleon-nucleon collisions in the Cu + Cu system. In the p(T) range 2-5 GeV/c, the strange mesons (K-S(0), K*(0)) similarly to the phi meson with hidden strangeness, showan intermediate suppression between the more suppressed light quark mesons (pi(0)) and the nonsuppressed baryons (p, (p) over bar). At higher transverse momentum, p(T) > 5 GeV/c, production of all particles is similarly suppressed by a factor of approximate to 2.
Published: 2014

35. System-size dependence of open-heavy-flavor production in nucleus-nucleus collisions atsNN=200GeV

Author: L. Aphecetche, V. S. Pantuev, Mate Csanad, Alexei Khanzadeev, Johannes Peter Wessels, P. Tarján, Y. L. Yamaguchi, E. Stenlund, Eva Haslum, B. Lenzi, B. Komkov, R. Pak, John Hill, H. A. Torii, Toru Sugitate, L. D. Isenhower, N. Kamihara, Saskia Mioduszewski, R. Armendariz, N. Apadula, H. Sakata, A. Drees, J. Kubart, Marisilvia Donadelli, V. Bumazhnov, M. P. Comets, K. Okada, S. F. Pate, Y. J. Mao, S. Kametani, David D'Enterria, M. A. L. Leite, D. McGlinchey, T. Tabaru, S. Afanasiev, A. Ster, H. Al-Bataineh, Maya Hachiya Shimomura, A. V. Kazantsev, N. N. Ajitanand, M. Issah, H. En'yo, M. J. Leitch, François Fleuret, T. Ichihara, T. V. Moukhanova, M. Rosati, M. D. Malik, E. Vznuzdaev, D. Kawall, R. Vértesi, Osamu Jinnouchi, Matthew G. Reuter, Takahiro Fusayasu, Y. I. Makdisi, Alexander Milov, I. Nakagawa, Senta Greene, K. S. Joo, M. N. Wagner, J. Jin, Takahiro Nakamura, K. S. Sim, J. H. Kang, Alexander Malakhov, J. S. Haggerty, V. Papavassiliou, Jason Newby, V. Dzhordzhadze, Sébastien Gadrat, F. Matathias, J. E. Frantz, Robert F. Hobbs, E. M. Takagui, O. Drapier, Frank Ellinghaus, B. E. Norman, E. O'Brien, S. P. Sorensen, A. A. Vinogradov, D. Hornback, D. Silvermyr, Y. Fukao, A. Shevel, V. Babintsev, L. S. Zolin, E. R. Kinney, W. J. Park, L. Tomášek, V. I. Kochetkov, Rushan Han, A. Romana, S. Butsyk, B. Love, Kensuke Homma, P. Mikeš, Dylan Walker, A. Hadj Henni, P. D. Barnes, D. P. Morrison, Junji Tojo, A. Yanovich, S. Campbell, Y. Kwon, Susumu Oda, Vladimir Samsonov, T. Hester, J. Murata, Jiangyong Jia, Y. Goto, Debashish Pal, R. A. Soltz, H. Borel, S. Sawada, C. P. Singh, A. Taranenko, H. Iinuma, B. M. Johnson, E. J. Desmond, A. Durum, Wei Xie, J. Ying, V. E. Semenov, A. Franz, M. B. Deaton, Gerd Joachim Kunde, J. Zimányi, M. Togawa, P. Constantin, Kazushi Miki, S. Chernichenko, J. Park, A. P.T. Palounek, A. Rakotozafindrabe, S. N. White, I. Shein, H. Hiejima, S. Esumi, A. Isupov, C. Suire, Tatsuya Chujo, K. Dehmelt, M. J. Tannenbaum, D. Sharma, Y. Tsuchimoto, Catherine Micaela Silvestre, B. Bassalleck, Jen-Chieh Peng, J. Sziklai, M. Grosse Perdekamp, K. Nakano, Tamas Ferenc Csorgo, A. G. Litvinenko, I. E. Yushmanov, Eun-Hee Kim, Tae-Yeon Lee, J. G. Lajoie, Martin Purschke, T. C. Awes, Kyoichiro Ozawa, T. Liška, M. Konno, W. E. Sondheim, Brian Cole, J. L. Nagle, K. Das, C. A. Aidala, T. Hachiya, M. K. Lee, H. A. Gustafsson, K. Imai, D. Mukhopadhyay, M. Mitrovski, R. S. Towell, V-N. Tram, K. Boyle, P. A. Rukoyatkin, Y. Tanaka, Y. S. Lai, Jun Kikuchi, I. Garishvili, Akio Kiyomichi, Xiong Wang, Z. Yasin, E. P. Hartouni, Henner Buesching, Y. Nakamiya, D. Kotchetkov, Dong Jo Kim, I. J. Choi, A. Kravitz, N. Kurihara, S. Baumgart, C. Zhang, J. Gosset, M. Naglis, M. Wysocki, S. Rembeczki, G. Baksay, Jan Rak, C. L. Silva, O. Dietzsch, Minghui Liu, Motoi Inaba, R. Lacey, A. Kozlov, A. Morreale, D. E. Fields, B. V. Jacak, C. Y. Chi, G. S. Kyle, I. Tserruya, R. Granier de Cassagnac, A. Adare, E. T. Atomssa, M. Heffner, Kenneth Francis Read, Yu. Efremenko, H. Valle, M. Gonin, Viktor Riabov, Nagahiro Saito, Z. Fraenkel, V. Singh, Masayasu Ishihara, J. Chiba, M. McCumber, R. Seto, K. Haruna, Tadaaki Isobe, James Alexander, F. Staley, B. Sahlmueller, A. Deshpande, L. Baksay, B. Azmoun, A. Král, M. J. Kweon, Marcus Hohlmann, S. Yokkaichi, W. A. Zajc, H. Pei, V. Baublis, P. L. McGaughey, J. T. Mitchell, Takao Sakaguchi, D. Winter, R. Averbeck, A. Denisov, V. Cianciolo, Byung-Sik Hong, Julia Velkovska, D. Yu Peressounko, Anne Marie Sickles, K. Kurita, A. Bazilevsky, H. Pereira, M. Chiu, Sergey Fokin, X. He, O. O. Omiwade, J. G. Boissevain, M. Oka, R. Seidl, Philippe Rosnet, Vladislav Manko, A. Dion, Masashi Kaneta, C. Klein-Boesing, Alexandre Lebedev, A. D. Frawley, Y. Watanabe, V. Peresedov, T. Horaguchi, M. Slunečka, D. M. Lee, S. Bathe, C. Pinkenburg, A. Enokizono, I. Younus, S. H. Aronson, G. R. Young, C. A. Ogilvie, T. K. Hemmick, Yasuo Miake, M. Stepanov, G. Roche, L. Kochenda, Hiroaki Ohnishi, Agneta Oskarsson, John Matthew Durham, A. Soldatov, J. Egdemir, S. Batsouli, H. Masui, A. K. Dubey, S. Belikov, W. Holzmann, Jason Kamin, Charles Maguire, S. P. Stoll, Y. Berdnikov, Y. Akiba, A. A. Bickley, S. S.E. Rosendahl, G. Bunce, M. Mishra, A. Churyn, D. Jouan, S. Nagamiya, T. L. Thomas, C. Vale, B. S. Chang, S. Takagi, K. N. Barish, Vaclav Vrba, Klaus Johannes Reygers, J. Klay, Kiyoshi Tanida, E. Kistenev, Xingguo Li, K. O. Eyser, A. K. Purwar, K. Fujiwara, Ryugo S. Hayano, H. Harada, Y. Riabov, Kenta Shigaki, M. Nguyen, M. L. Brooks, H. W. Van Hecke, A. S. Nyanin, Rachid Nouicer, M. Ouchida, J. Asai, D. Lynch, Shingo Sakai, C. R. Cleven, C. Haegemann, Y. Inoue, A. Taketani, C. L. Woody, Dong-Hun Kim, V. L. Rykov, T. Dahms, N. Grau, K. Shoji, O. Zaudtke, P. W. Stankus, M. Virius, I. V. Sourikova, Steven E. Skutnik, A. Glenn, I. Ravinovich, Y. Nagata, H. Qu, R. Bennett, M. Finger, Hideki Hamagaki, K. Aoki, G. David, T. A. Shibata, D. Isenhower, A. Toia, L. Mašek, H. Kanou, Taku Gunji, H. Gong, J. Seele, F. Kajihara, H. Delagrange, S. Zhou, A. Baldisseri, J. L. Charvet, T. E. Miller, P. Chung, Susumu Sato, and W. S. Emam
Subjects: Physics, Nuclear and High Energy Physics, Range (particle radiation), Quantitative Biology::Neurons and Cognition, 010308 nuclear & particles physics, Hadron, chemistry.chemical_element, Electron, 01 natural sciences, 7. Clean energy, Copper, Nuclear physics, medicine.anatomical_structure, chemistry, 0103 physical sciences, medicine, High Energy Physics::Experiment, Charm (quantum number), Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon, Relativistic Heavy Ion Collider, Nucleus
Abstract: The PHENIX Collaboration at the Relativistic Heavy Ion Collider has measured open-heavy-flavor production in Cu + Cu collisions at v root s(NN) = 200 GeV through the measurement of electrons at midrapidity that originate from semileptonic decays of charm and bottom hadrons. In peripheral Cu + Cu collisions an enhanced production of electrons is observed relative to p + p collisions scaled by the number of binary collisions. In the transverse momentum range from 1 to 5 GeV/c the nuclear modification factor is R-AA similar to 1.4. As the system size increases to more central Cu + Cu collisions, the enhancement gradually disappears and turns into a suppression. For p(T) > 3 GeV/c, the suppression reaches R-AA similar to 0.8 in the most central collisions. The p(T) and centrality dependence of R-AA in Cu + Cu collisions agree quantitatively with R-AA in d + Au and Au + Au collisions, if compared at a similar number of participating nucleons .
Published: 2014

36. Transverse-energy distributions at midrapidity inp+p,d+Au, andAu+Aucollisions atsNN=62.4–200 GeV and implications for particle-production models

Author: J. M. Burward-Hoy, R. A. Soltz, V. Bumazhnov, M. P. Comets, P. Rosnet, Vladislav Manko, Y. J. Kwon, Saskia Mioduszewski, W. C. Smith, Robert F. Hobbs, L. Sanfratello, W. C. Chang, Ferenc Deák, N. Kamihara, M. K. Lee, Yves Roland Schutz, F. Matathias, R. Armendariz, X. Camard, M. N. Hagiwara, Debashish Pal, S. Sawada, S. Butsyk, C. Vale, Vladimir Samsonov, A. Drees, I. Otterlund, J. Jin, A. Franz, A. Devismes, E. M. Takagui, T. L. Thomas, Taku Gunji, B. D. Fox, F. Kajihara, B. Espagnon, K. Das, E. P. Hartouni, R. S. Towell, H. Delagrange, C. H. Kuberg, Tamas Ferenc Csorgo, Akio Kiyomichi, O. Zaudtke, J. Chiba, H. W. Van Hecke, J. L. Nagle, V. S. Pantuev, N. Kurihara, S. Zhou, M. A. Volkov, M. Harvey, Y. S. Kim, M. Wysocki, B. Khachaturov, T. Matsumoto, M. G. Hur, C. Y. Chi, Y. Cobigo, M. Grosse Perdekamp, Ryugo S. Hayano, K. Hasuko, C. A. Ogilvie, M. Chiu, Ajit Kumar Mohanty, Kensuke Homma, T. A. Shibata, A. Deshpande, J. L. Drachenberg, K. Okada, T. K. Hemmick, N. N. Ajitanand, H. Kobayashi, A. Pierson, S. Bathe, Agneta Oskarsson, I. Ravinovich, G. C. Mishra, Y. Nagata, S. Chernichenko, H. En'yo, P. Constantin, Yasuo Miake, M. J. Leitch, H. Lim, Marie Germain, T. Ichihara, S. C. Johnson, B. Bassalleck, Y. Berdnikov, D. Isenhower, Joakim Nystrand, Takao Sakaguchi, S. S. Ryu, N. Grau, S. F. Pate, Eva Haslum, C. P. Singh, Y. Akiba, C. Klein-Boesing, Osamu Jinnouchi, H. Pei, M. Konno, German Martinez, Y. Riabov, Kenta Shigaki, David Olle Rickard Silvermyr, K. Shoji, S. Nagamiya, Kazuhiro Tanaka, B. M. Johnson, Takahiro Nakamura, A. D. Frawley, L. Kochenda, F. K. Wohn, Matthew G. Reuter, Klaus Johannes Reygers, B. Azmoun, M. J. Kweon, R. Bennett, A. Isupov, C. Suire, X. R. Wang, S. Afanasiev, M. Nguyen, D. Winter, D. Yu Peressounko, A. Ster, P. W. Stankus, Ahmed Al-Jamel, S. H. Aronson, T. Kawagishi, T. E. Miller, A. G. Litvinenko, J. E. Frantz, J. Sziklai, R. Santo, A. Enokizono, A. S. Nyanin, A. Kiss, G. Roche, Y. Le Bornec, S. P. Sorensen, W. Holzmann, Herve Borel, Brian Cole, M. Holmes, P. Tarján, Sean A. Kelly, Henner Buesching, A. Glenn, A. Taketani, R. Kohara, I. D. Ojha, Alexander Malakhov, V. L. Rykov, T. Dahms, Viktor Veszpremi, V. Papavassiliou, Maya Hachiya Shimomura, P. Chand, Y. I. Makdisi, J. Egdemir, T. Shohjoh, Y. Watanabe, A. Durum, C. R. Cleven, A. Dion, B. Forestier, M. T. Bjorndal, J. G. Boissevain, I. Younus, Masashi Kaneta, E. Kim, S. P. Stoll, A. Kozlov, L. S. Zolin, K. S. Sim, T. Tabaru, P. J. Kroon, R. Seto, K. Haruna, A. Taranenko, M. J. Tannenbaum, D. S. Brown, Senta Greene, W. J. Park, S. Belikov, K. S. Joo, V. V. Ikonnikov, Junji Tojo, S. S.E. Rosendahl, B. Sahlmueller, G. Bunce, A. Soldatov, B. E. Norman, E. O'Brien, K. Katou, P. D. Barnes, Steven E. Skutnik, D. Mukhopadhyay, V. Dzhordzhadze, D. Bucher, H. J. Kim, H. Qu, A. Yanovich, C. L. Woody, M. Inuzuka, Hideki Hamagaki, K. Aoki, D. E. Fields, G. David, X. He, O. O. Omiwade, B. V. Jacak, C. Pinkenburg, M. Naglis, S. Y. Fung, H. Hiejima, D. Jouan, A. K. Purwar, V. Peresedov, C. L. Silva, John Hill, K. Oyama, M. Stepanov, S. Esumi, Toru Sugitate, L. D. Isenhower, D. Sharma, Masayasu Ishihara, Susumu Sato, H. Masui, A. K. Dubey, J. Gosset, J. P. Sullivan, S. Takagi, M. Muniruzzaman, Martin Purschke, C. A. Aidala, F. Gastineau, K. N. Barish, I. V. Sourikova, H. Torii, François Fleuret, K. Imai, S. N. White, J. G. Lajoie, V. I. Kochetkov, J. Murata, T. J. Uam, D. Kotchetkov, M. L. Brooks, Gerd Joachim Kunde, W. E. Sondheim, I. Shein, S. Yokkaichi, J. M. Heuser, T. Hachiya, K. Boyle, P. A. Rukoyatkin, Alberto Baldisseri, Z. Fraenkel, Y. J. Mao, S. Kametani, Pàl Hidas, Anne Marie Sickles, Y. Tanaka, J. H. Kang, J. S. Haggerty, T. K. Shea, A. Romana, R. K. Choudhury, A. G. Hansen, Shingo Sakai, S. Gadrat, Nagahiro Saito, F. Staley, Charles Maguire, S. Leckey, G. R. Young, I. J. Choi, Josh Moss, Kiyoshi Tanida, E. Kistenev, Hiroaki Ohnishi, H. Harada, Y. Fukao, Jan Rak, R. Lacey, R. Granier de Cassagnac, V-N. Tram, J. M. Qualls, Motoi Inaba, M. Sarsour, Mate Csanad, David D'Enterria, R. P. Pisani, Xingguo Li, M. Gonin, Nikolay Tyurin, V.N. Penev, M. N. Wagner, K. Kurita, H. Pereira, Minghui Liu, M. Heffner, Kenneth Francis Read, Tadaaki Isobe, J. S. Chai, P. L. McGaughey, A. V. Kazantsev, Alexei Khanzadeev, N. Bruner, E. Stenlund, Jen-Chieh Peng, T. V. Moukhanova, E. J. Desmond, Dong Jo Kim, Jean-Pierre Cussonneau, M. Togawa, T. C. Awes, Kyoichiro Ozawa, J. Park, Florian Bauer, Jun Kikuchi, Y. Tsuchimoto, I. E. Yushmanov, Eun-Hee Kim, R. Vértesi, Ch. Finck, Jason Newby, Alexander Milov, O. Drapier, M. Rosati, M. Velkovsky, E. R. Kinney, D. P. Morrison, A. A. Vinogradov, Henrik Tydesjö, H. A. Gustafsson, S. Campbell, Jiangyong Jia, Y. Goto, V. E. Semenov, J. Zimányi, C. Zhang, Tatsuya Chujo, I. Tserruya, Yu. Efremenko, V. Singh, G. B. Kim, Viktor Riabov, B. Komkov, O. Dietzsch, H. Valle, S. Batsouli, Dipanwita Dutta, Julia Velkovska, M. A. L. Leite, Hirohiko Sato, S. K. Tuli, H. Iinuma, M. C. McCain, A. P.T. Palounek, V. Babintsev, W. A. Zajc, V. Baublis, A. Denisov, V. Cianciolo, Sergey Fokin, T. Horaguchi, A. Hoover, S. S. Adler, G. S. Kyle, N. Willis, James Alexander, M. Issah, M. D. Malik, E. Vznuzdaev, R. Averbeck, Byung-Sik Hong, A. Bazilevsky, Alexandre Lebedev, D. M. Lee, Xiaopeng Zong, L. Aphecetche, Takeo Kawabata, Johannes Peter Wessels, A. Hadj Henni, Wei Xie, and J. T. Mitchell
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Transverse plane, Deuterium, Production model, High Energy Physics::Experiment, Nuclear Experiment, 16. Peace & justice, Nucleon, Glauber, Ansatz
Abstract: Measurements of the midrapidity transverse-energy distribution, dE(T)/d eta, are presented for p + p, d+Au, and Au+Au collisions atv root s(NN) = 200 GeV and additionally for Au+Au collisions atv root s(NN) = 62.4 and 130 GeV. The dE(T)/d eta distributions are first compared with the number of nucleon participants N-part, number of binary collisions N-coll, and number of constituent-quark participants N-qp calculated from a Glauber model based on the nuclear geometry. For Au+Au, /N-part increases with N-part, while /N-qp is approximately constant for all three energies. This indicates that the two-component ansatz, dE(T)/d eta alpha (1 - x)N-part/2 + xN(coll), which was used to represent E-T distributions, is simply a proxy for N-qp, and that the N-coll term does not represent a hard-scattering component in E-T distributions. The dE(T)/d eta distributions of Au+Au and d+Au are then calculated from the measured p + p E-T distribution using two models that both reproduce the Au+Au data. However, while the number-of-constituent-quark-participant model agrees well with the d+Au data, the additive-quark model does not.
Published: 2014

37. Developing Spent Fuel Assembly for Advanced NDA Instrument Calibration - NGSI Spent Fuel Project

Author: Steven E. Skutnik, Jianwei Hu, Ian C Gauld, and James Banfield
Subjects: business.industry, Calibration (statistics), Environmental science, Operations management, Process engineering, business, Spent nuclear fuel
Published: 2014

38. Medium Modification of Jet Fragmentation inAu+AuCollisions atsNN=200 GeVMeasured in Direct Photon-Hadron Correlations

Author: K. Dehmelt, M. Kurosawa, Jen-Chieh Peng, F. Matathias, L. D'Orazio, Y. J. Mao, S. Kametani, Kensuke Homma, E. Richardson, Saskia Mioduszewski, P. Constantin, S. Miyasaka, Takao Sakaguchi, J. H. Kang, J. S. Haggerty, S. R. Lee, S. Chernichenko, B. Meredith, B. Bassalleck, C. Klein-Boesing, John Hill, Inkyu Park, P. D. Barnes, Jongmin Lee, A. D. Frawley, T. Tabaru, M. Konno, Hongfang Liu, Toru Sugitate, D. E. Fields, S. Huang, C. Silvestre, L. D. Isenhower, B. V. Jacak, B. Lewis, B. Komkov, Xiong Wang, O. Dietzsch, S. H. Aronson, J. Jin, E. M. Takagui, H. Valle, M. McCumber, Dong Jo Kim, W. Holzmann, Y. S. Lai, Marisilvia Donadelli, V. Bumazhnov, M. P. Comets, K. Sakashita, Herve Borel, D. Lynch, J. Hanks, Hiroaki Ohnishi, K. B. Lee, François Fleuret, R. A. Soltz, Dipanwita Dutta, Y. Nakamiya, D. Kotov, Norio Saito, Tsutomu Mibe, M. A. L. Leite, Y. Tsuchimoto, C. Gal, Y. Miyachi, Sung Keun Park, Tomoya Tsuji, M. Mendoza, S. N. White, N. N. Ajitanand, A. Taketani, D. S. Jumper, Takahiro Nakamura, Julia Velkovska, R. Tanabe, D. Layton, D. McGlinchey, Y. Ikeda, Maya Hachiya Shimomura, R. S. Hollis, Susumu Oda, A. Durum, J. Egdemir, Zvi Hirsh Citron, Y. I. Makdisi, M. Grosse Perdekamp, S. H. Lim, K. Yamaura, K. O. Eyser, A. K. Purwar, K. Fujiwara, K. Nakano, J. G. Boissevain, R. Belmont, M. Stepanov, G. Baksay, Jason Kamin, M. B. Deaton, A. Sen, Masashi Kaneta, V. L. Rykov, T. Dahms, K. B. Kim, L. Ding, W. E. Sondheim, J. S. Kapustinsky, M. E. Connors, D. Ivanischev, V. Babintsev, S. P. Stoll, V. S. Pantuev, M. Sano, I. Tserruya, Y. L. Yamaguchi, D. Roach, K. M. Kijima, Yu. Efremenko, Tae-Yeon Lee, Martin Purschke, C. A. Aidala, S. Tarafdar, R. Akimoto, C. Pinkenburg, M. Rosati, W. C. Chang, R. Vértesi, K. Boyle, P. A. Rukoyatkin, C. R. Cleven, V. Singh, Y. Tanaka, J. Hamblen, C. Haegemann, Y. Inoue, C. Baumann, B. Sahlmueller, K. Hashimoto, E. Leitner, I. Ravinovich, M. Tomášek, G. S. Kyle, S. S.E. Rosendahl, G. Bunce, Y. J. Kim, M. J. Tannenbaum, H. Torii, Junji Tojo, James Alexander, J. Zimanyi, G. Roche, B. Love, A. Yu. Semenov, Rushan Han, S. Butsyk, Vladimir Samsonov, A. A. Vinogradov, E. Mannel, M. S. Daugherity, C. P. Singh, T. Ichihara, B. M. Johnson, Osamu Jinnouchi, M. Javani, Xingguo Li, Peter Christiansen, D. Winter, D. Yu Peressounko, Matthew G. Reuter, Atsushi Takahara, K. A. Drees, K. Karatsu, Filip Krizek, J. Gosset, Y. Hori, Anne Marie Sickles, Y. Nagata, Takahiro Fusayasu, R. Averbeck, E. C. Aschenauer, A. Churyn, Byung-Sik Hong, A. Bazilevsky, D. Mukhopadhyay, E. Tennant, S. Rembeczki, R. J. Petti, K. Okada, H. W. Van Hecke, J. T. Mitchell, D. Jouan, Philippe Rosnet, M. Bai, T. Kempel, Dong-Hun Kim, Eva Haslum, B. Lenzi, A. Morreale, S. Kaneti, R. Seidl, Vladislav Manko, S. Belikov, S. Baumgart, H. En'yo, M. J. Leitch, Christine Nattrass, T. Todoroki, Jiangyong Jia, C. L. Woody, A. Berdnikov, Y. Goto, A. Isupov, C. Suire, M. Naglis, Alexander Malakhov, Z. Fraenkel, H. J. Moon, F. Staley, L. Baksay, A. Glenn, J. Sziklai, D. Silvermyr, L. S. Zolin, Alexandre Lebedev, A. G. Litvinenko, D. M. Lee, K. Gainey, J. E. Frantz, M. Slunečka, Zhiying You, D. Kotchetkov, R. Bennett, C. A. Ogilvie, Brian Cole, Minghui Liu, Tamas Ferenc Csorgo, S. Afanasiev, A. Ster, W. J. Park, Eunja Kim, K. Watanabe, Christopher Rosen, R. S. Towell, R. K. Choudhury, S. P. Sorensen, D. Kleinjan, A. Yanovich, Dylan Walker, J. P. Wood, P. Tarján, I. Garishvili, Akio Kiyomichi, F. Wei, J. Klatsky, X. Bing, O. Chvala, M. Kawashima, S. Yokkaichi, K. Kiriluk, M. Finger, S. Dairaku, T. K. Hemmick, Seong H. Kim, J. M. Durham, E. H. Kim, Dmitry Blau, B. Azmoun, A. Král, M. J. Kweon, X. Jiang, Yasuo Miake, Masayasu Ishihara, O. Zaudtke, K. Shoji, G. R. Young, C. Vale, B. S. Chang, J. Newby, A. Kozlov, Alexander Milov, M. Heffner, Kyeongpil Lee, R. Seto, I. Nakagawa, R. Luechtenborg, Tomofumi Nagae, J. L. Nagle, P. Castera, Kenneth Francis Read, A. Kiss, M. Soumya, P. W. Stankus, Young-Ki Kim, N. Kurihara, K. Haruna, H. Pei, E. J. Desmond, T. Engelmore, N. Novitzky, J. G. Lajoie, J. Ide, Z. Yasin, T. Hachiya, Henner Buesching, O. Drapier, Frank Ellinghaus, M. Virius, E. T. Atomssa, L. Kochenda, M. Issah, M. Togawa, E. Vazquez-Zambrano, J. Klay, M. K. Lee, J. S. Kang, Steve Edwards, I. Danchev, S. Takagi, M. Oka, E. R. Kinney, Tadaaki Isobe, C. Y. Chi, A. Nederlof, J. Park, D. Hornback, D. P. Morrison, P. Kline, K. S. Lee, K. Das, H. J. Kim, A. Rakotozafindrabe, A. Kravitz, E. P. Hartouni, S. Campbell, M. Gonin, D. Kawall, B. H. Kang, Senta Greene, V. E. Semenov, K. N. Barish, Y. Komatsu, H. Themann, S. Wolin, R. Pak, C. H. Chen, M. Kasai, N. Kamihara, Steven E. Skutnik, K. S. Sim, V. Dzhordzhadze, M. I. Nagy, Y. Kwon, A. Garishvili, X. Gong, Marcus Hohlmann, V. I. Kochetkov, P. L. McGaughey, A. Taranenko, S. Sano, P. Liebing, H. Al-Ta'Ani, A. Sukhanov, K. Kurita, D. Watanabe, L. A. Linden Levy, Tatsuya Chujo, H. Pereira, A. T. Basye, I. V. Sourikova, I. E. Yushmanov, A. Manion, B. E. Norman, R. Armendariz, Y. Morino, M. Chiu, J. Murata, Byoungchoo Park, A. Drees, R. Yang, H. Qu, H. Hiejima, K. S. Joo, S. Taneja, Kazushi Miki, T. Horaguchi, Brajesh K. Singh, S. Bathe, Gerd Joachim Kunde, Charles Maguire, L. Guo, Alexei Khanzadeev, Agneta Oskarsson, Shinichi Masumoto, S. Choi, B. Fadem, E. O'Brien, C. O. Kim, I. Shein, E. Stenlund, J. B. Choi, H. Sakata, J. Kubart, A. V. Kazantsev, M. Vargyas, M. L. Brooks, Hideki Hamagaki, K. Aoki, G. David, K. Imai, K. I. Hahn, Y. Onuki, M. D. Malik, X. He, Y. Berdnikov, S. H. Lee, Y. Akiba, C. McKinney, E. Vznuzdaev, K. Sedgwick, M. Mishra, S. Nagamiya, Dipak Kumar Mishra, Kiyoshi Tanida, O. O. Omiwade, E. Kistenev, L. Tomášek, N. Apadula, P. Mikeš, Alberto Baldisseri, Mihael Makek, Jan Rak, M. Ouchida, N. Means, R. Lacey, Y. Aramaki, V. Peresedov, R. Granier de Cassagnac, A. Adare, Vaclav Vrba, Klaus Johannes Reygers, Rui Wei, J. Asai, H. Harada, J. Sun, J. Koster, L. Patel, A. Deshpande, T. V. Moukhanova, S. Batsouli, Shingo Sakai, T. L. Thomas, A. Vossen, H. Masui, A. K. Dubey, T. C. Awes, Kyoichiro Ozawa, T. Liška, J. S. Bok, A. A. Bickley, Jun Kikuchi, A. Veicht, Y. Watanabe, Ryugo S. Hayano, A. Romana, I. Younus, Y. Riabov, Kenta Shigaki, M. Nguyen, A. S. Nyanin, S. Esumi, D. Sharma, Rachid Nouicer, A. N. Zelenski, M. Proissl, R. Ichimiya, A. Soldatov, C. Zhang, A. Hadj Henni, Beomkyu Kim, H. Å Gustafsson, Wei Xie, P. Ružička, I. J. Choi, L. Aphecetche, A. Dion, Johannes Peter Wessels, Viktor Riabov, K. V. Dharmawardane, H. Iinuma, A. P.T. Palounek, Aaron Angerami, W. A. Zajc, V. Baublis, A. Denisov, Yuki Watanabe, V. Cianciolo, Y. Tomita, Sergey Fokin, Ajit Kumar Mohanty, T. A. Shibata, C. L. Silva, T. Sato, D. Isenhower, A. Toia, L. Mašek, H. Kanou, Taku Gunji, H. Gong, J. Seele, F. Kajihara, H. Delagrange, S. Zhou, C. M. Camacho, S. D. Rolnick, Prashant Shukla, S. F. Pate, J. L. Charvet, Ke. Nakamura, T. E. Miller, H. Al-Bataineh, A. Enokizono, P. Chung, J. Imrek, S. Motschwiller, Susumu Sato, W. S. Emam, V. Papavassiliou, Sébastien Gadrat, A. Datta, H. Asano, M. Mitrovski, Takafumi Niida, Bum-Hoon Lee, M. Wysocki, B. Bannier, T. Murakami, Robert F. Hobbs, Debashish Pal, S. Sawada, J. Ying, A. Franz, R. Reynolds, M. Sarsour, Mate Csanad, A. Iordanova, M. Nihashi, David D'Enterria, R. P. Pisani, M. N. Wagner, Y. Fukao, A. Shevel, T. Hester, N. A. Sparks, V-N. Tram, N. Grau, M. Leitgab, Motoi Inaba, R. M. Wright, J. Chiba, and Alice Mignerey
Subjects: Physics, Energy loss, Photon, 010308 nuclear & particles physics, Hadron, General Physics and Astronomy, 7. Clean energy, 01 natural sciences, Nuclear physics, Fragmentation (mass spectrometry), 0103 physical sciences, Fragmentation function, High Energy Physics::Experiment, Atomic physics, Nuclear Experiment, 010306 general physics
Abstract: The jet fragmentation function is measured with direct photon-hadron correlations in p + p and Au + Au collisions at root S-NN = 200 GeV. The P-T of the photon is an excellent approximation to the initial P-T of the jet and the ratio Z(T) = P-T(h)/P-T(gamma) is used as a proxy for the jet fragmentation function. A statistical subtraction is used to extract the direct photon-hadron yields in Au + Au collisions while a photon isolation cut is applied in p + p. I-AA, the ratio of hadron yield opposite the photon in Au + Au to that in p + p, indicates modification of the jet fragmentation function. Suppression, most likely due to energy loss in the medium, is seen at high Z(T). The associated hadron yield at low Z(T) is enhanced at large angles. Such a trend is expected from redistribution of the lost energy into increased production of low-momentum particles.
Published: 2013

39. Measurement of Direct Photons inAu+AuCollisions atsNN=200 GeV

Author: I. Ravinovich, M. Rosati, Y. Nagata, G. C. Mishra, A. V. Kazantsev, Takao Sakaguchi, S. S. Ryu, C. Klein-Boesing, A. A. Vinogradov, Henrik Tydesjö, R. A. Soltz, J. G. Boissevain, Masashi Kaneta, J. M. Burward-Hoy, A. D. Frawley, Jiangyong Jia, J. T. Mitchell, A. Ster, Y. Goto, H. A. Gustafsson, M. Grosse Perdekamp, M. E. Connors, R. Bennett, Robert F. Hobbs, S. H. Aronson, R. S. Towell, Akio Kiyomichi, N. Kurihara, Marie Germain, M. G. Hur, Ahmed Al-Jamel, C. Y. Chi, T. C. Awes, Kyoichiro Ozawa, C. Zhang, Osamu Jinnouchi, Matthew G. Reuter, David D'Enterria, C. Pinkenburg, Y. J. Kwon, W. C. Smith, J. Newby, Anne Marie Sickles, A. G. Litvinenko, B. Azmoun, W. Holzmann, M. J. Kweon, B. Komkov, I. D. Ojha, M. K. Lee, Vladislav Manko, Alexander Malakhov, R. P. Pisani, A. Deshpande, D. Winter, M. Chiu, M. Stepanov, G. Roche, V. Bumazhnov, M. P. Comets, D. Yu Peressounko, Steven E. Skutnik, J. E. Frantz, D. Silvermyr, Y. Le Bornec, S. P. Sorensen, K. Das, Masamichi Ishihara, Nikolay Tyurin, E. P. Hartouni, Minghui Liu, Viktor Riabov, M. N. Wagner, C. A. Ogilvie, Herve Borel, T. A. Shibata, Shingo Sakai, L. S. Zolin, T. K. Hemmick, P. Tarján, M. Heffner, Kenneth Francis Read, T. L. Thomas, Alexei Khanzadeev, Debashish Pal, S. Sawada, A. Kozlov, A. Franz, T. Ichihara, Y. Fukao, R. Seto, K. Haruna, Norio Saito, A. Glenn, A. Taketani, H. Qu, M. A. L. Leite, Yasuo Miake, A. Dion, D. E. Fields, B. V. Jacak, V. L. Rykov, T. Dahms, T. Tabaru, Ryugo S. Hayano, Jen-Chieh Peng, Y. Riabov, Hideki Hamagaki, K. Aoki, G. David, S. Kametani, V. Dzhordzhadze, S. Takagi, B. Espagnon, Kenta Shigaki, Senta Greene, M. Nguyen, E. Stenlund, A. K. Purwar, D. Isenhower, C. Vale, M. Issah, W. A. Zajc, K. N. Barish, J. H. Kang, J. S. Haggerty, A. Romana, L. Kochenda, A. Kiss, A. Taranenko, O. Zaudtke, Margaret Harvey, B. E. Norman, V-N. Tram, A. S. Nyanin, E. O'Brien, Christine Angela Aidala, S. F. Pate, G. R. Young, M. D. Malik, Charles Maguire, S. Leckey, Motoi Inaba, V. Baublis, A. Denisov, V. Cianciolo, E. Vznuzdaev, J. G. Lajoie, M. N. Hagiwara, V. S. Pantuev, O. Dietzsch, Xiong Wang, S. Kelly, C. R. Cleven, Henner Buesching, Sergey Fokin, V. Babintsev, T. Hachiya, N. N. Ajitanand, H. Valle, Josh Moss, S. Butsyk, Vladimir Samsonov, Dong Jo Kim, I. Otterlund, G. S. Kyle, T. Horaguchi, J. L. Drachenberg, N. Willis, James Alexander, T. Kawagishi, P. J. Kroon, Y. Cobigo, Takahiro Nakamura, M. T. Bjorndal, V. Papavassiliou, Sébastien Gadrat, T. E. Miller, Jan Rak, I. J. Choi, Maya Hachiya Shimomura, J. M. Heuser, Julia Velkovska, Kiyoshi Tanida, Tadaaki Isobe, Y. I. Makdisi, R. Averbeck, Byung-Sik Hong, Tamas Ferenc Csorgo, R. Lacey, M. Gonin, M. L. Brooks, A. Bazilevsky, J. S. Chai, A. Enokizono, L. Aphecetche, J. L. Nagle, Philippe Rosnet, B. Sahlmueller, K. Okada, K. Hasuko, S. Afanasiev, R. Granier de Cassagnac, E. Kistenev, Alexandre Lebedev, T. Shohjoh, H. En'yo, N. Grau, J. Egdemir, K. Kurita, H. Pereira, D. M. Lee, A. Durum, P. L. McGaughey, J. Imrek, M. Holmes, P. Constantin, M. J. Tannenbaum, M. J. Leitch, K. Shoji, Joakim Nystrand, Alexander Milov, X. He, O. O. Omiwade, D. S. Brown, Eva Haslum, P. W. Stankus, D. Mukhopadhyay, V. Peresedov, D. Bucher, O. Drapier, R. Pak, Taku Gunji, K. S. Sim, Hiroaki Ohnishi, M. Csanad, S. P. Stoll, E. R. Kinney, Junji Tojo, F. Kajihara, D. P. Morrison, S. Campbell, H. Hiejima, T. V. Moukhanova, S. S.E. Rosendahl, Johannes Peter Wessels, H. Delagrange, V. E. Semenov, J. Zimányi, K. Imai, H. Masui, G. Bunce, Tatsuya Chujo, I. Tserruya, C. L. Woody, Yu. Efremenko, H. Harada, W. J. Park, J.-G. Park, E. J. Desmond, A. K. Dubey, P. D. Barnes, A. Yanovich, S. N. White, V. Singh, W. E. Sondheim, K. Boyle, P. A. Rukoyatkin, S. Y. Fung, John Hill, H. A. Torii, Toru Sugitate, L. D. Isenhower, Xingguo Li, Kensuke Homma, A. Hadj Henni, S. Chernichenko, M. Togawa, S. Batsouli, D. Jouan, H. Lim, Y. S. Kim, B. Bassalleck, François Fleuret, B. Forestier, I. V. Sourikova, H. W. Van Hecke, Florian Bauer, Wei Xie, M. Konno, Hirohiko Sato, S. K. Tuli, S. Bathe, Y. Tsuchimoto, Agneta Oskarsson, J. Gosset, H. Iinuma, M. C. McCain, Y. Berdnikov, Y. Akiba, I. E. Yushmanov, Eun-Hee Kim, A. P.T. Palounek, S. Nagamiya, Kazuhiro Tanaka, J. P. Sullivan, Klaus Johannes Reygers, Y. Tanaka, N. Kamihara, S. Yokkaichi, T. K. Shea, F. Matathias, R. Armendariz, A. Drees, F. Staley, H. Pei, R. Vértesi, J. Murata, Y. Watanabe, Saskia Mioduszewski, J. Jin, E. M. Takagui, C. P. Singh, B. M. Johnson, A. Isupov, C. Suire, J. Sziklai, Brian Cole, I. Younus, S. Belikov, K. S. Joo, M. Wysocki, A. Soldatov, M. Naglis, C. L. Silva, S. Esumi, D. Sharma, Martin Purschke, F. Gastineau, Susumu Sato, D. Kotchetkov, V. I. Kochetkov, Z. Fraenkel, Gerd Joachim Kunde, I. Shein, Alberto Baldisseri, and J. Chiba
Subjects: Physics, Range (particle radiation), Photon, 010308 nuclear & particles physics, Bremsstrahlung, General Physics and Astronomy, Parton, Plasma, 01 natural sciences, 7. Clean energy, Distribution function, Isospin, 0103 physical sciences, Quark–gluon plasma, High Energy Physics::Experiment, Atomic physics, Nuclear Experiment, 010306 general physics
Abstract: We report the measurement of direct photons at midrapidity in Au + Au collisions at root s(NN) = 200 GeV. The direct photon signal was extracted for the transverse momentum range of 4 GeV/c < pT < 22 GeV/c, using a statistical method to subtract decay photons from the inclusive photon sample. The direct photon nuclear modification factor R-AA was calculated as a function of p(T) for different Au + Au collision centralities using the measured p + p direct photon spectrum and compared to theoretical predictions. R-AA was found to be consistent with unity for all centralities over the entire measured pT range. Theoretical models that account for modifications of initial direct photon production due to modified parton distribution functions in Au and the different isospin composition of the nuclei predict a modest change of R-AA from unity. They are consistent with the data. Models with compensating effects of the quark-gluon plasma on high-energy photons, such as suppression of jet-fragmentation photons and induced-photon bremsstrahlung from partons traversing the medium, are also consistent with this measurement.
Published: 2012

40. Nuclear-modification factor for open-heavy-flavor production at forward rapidity in Cu+Cu collisions atsNN=200GeV

Author: Tadaaki Isobe, T. E. Miller, P. L. McGaughey, I. Tserruya, P. Chung, W. S. Emam, M. Chiu, S. F. Pate, Yu. Efremenko, H. Al-Bataineh, V. Singh, V. Papavassiliou, Sébastien Gadrat, T. A. Shibata, S. Takagi, K. N. Barish, M. L. Brooks, A. V. Kazantsev, Mate Csanad, L. Tomášek, P. Mikeš, Robert F. Hobbs, D. Isenhower, A. Toia, L. Mašek, B. Love, Alexander Milov, A. G. Litvinenko, T. C. Awes, Kyoichiro Ozawa, T. Liška, D. E. Fields, I. Nakagawa, B. V. Jacak, Jun Kikuchi, O. Drapier, Frank Ellinghaus, A. Kozlov, E. R. Kinney, R. Seto, H. Kanou, Taku Gunji, H. Gong, R. Vértesi, G. S. Kyle, Debashish Pal, D. P. Morrison, K. Haruna, M. McCumber, J. Seele, S. Sawada, S. Campbell, F. Kajihara, V. E. Semenov, J. Ying, A. Franz, Minghui Liu, J. Zimányi, X. He, O. O. Omiwade, M. Heffner, Tatsuya Chujo, K. Dehmelt, H. Delagrange, Kenneth Francis Read, V. Peresedov, Jen-Chieh Peng, S. Zhou, N. N. Ajitanand, S. Batsouli, H. Masui, A. K. Dubey, A. A. Bickley, Xiong Wang, Dong Jo Kim, M. Mitrovski, James Alexander, Takahiro Nakamura, Susumu Oda, J. Egdemir, C. Silvestre, Hiroaki Ohnishi, M. B. Deaton, M. Wysocki, A. Durum, Steven E. Skutnik, Jason Kamin, S. P. Stoll, R. Averbeck, Byung-Sik Hong, David D'Enterria, S. S.E. Rosendahl, G. Bunce, A. Bazilevsky, Marisilvia Donadelli, Y. Tanaka, M. Ouchida, Philippe Rosnet, A. Churyn, V. Bumazhnov, M. P. Comets, J. Chiba, D. Jouan, Jan Rak, R. Lacey, R. Pak, N. Kamihara, K. S. Joo, V. S. Pantuev, R. Armendariz, Alexandre Lebedev, H. Qu, Andry Malala Rakotozafindrabe, A. Drees, J. Asai, R. Granier de Cassagnac, A. Adare, D. M. Lee, H. Iinuma, R. A. Soltz, J. T. Mitchell, J. Kubart, O. Dietzsch, F. Staley, L. Baksay, Hideki Hamagaki, K. Aoki, G. David, E. T. Atomssa, Shingo Sakai, H. Valle, J. E. Frantz, C. A. Ogilvie, R. Seidl, T. K. Hemmick, Yasuo Miake, Y. L. Yamaguchi, Vladislav Manko, B. Komkov, A. P.T. Palounek, L. Kochenda, H. Pei, M. Issah, M. N. Wagner, C. L. Woody, Takao Sakaguchi, Junji Tojo, M. Slunečka, Norio Saito, C. Klein-Boesing, M. D. Malik, E. Vznuzdaev, M. A. L. Leite, Eva Haslum, B. Lenzi, Julia Velkovska, Rushan Han, S. Esumi, N. Grau, D. Sharma, S. Belikov, S. Butsyk, K. Shoji, K. S. Sim, V. Dzhordzhadze, A. D. Frawley, Vladimir Samsonov, P. W. Stankus, E. J. Desmond, K. Okada, Y. Kwon, S. Afanasiev, A. Ster, T. Tabaru, A. Garishvili, V. Babintsev, Xingguo Li, M. Togawa, I. V. Sourikova, H. Hiejima, S. H. Aronson, Tae-Yeon Lee, T. L. Thomas, Tamas Ferenc Csorgo, W. A. Zajc, Martin Purschke, M. Grosse Perdekamp, B. Sahlmueller, H. En'yo, J. Park, L. Aphecetche, V. Baublis, A. Denisov, M. J. Leitch, V. Cianciolo, S. P. Sorensen, Dylan Walker, Y. Fukao, E. H. Kim, J. L. Nagle, J. Newby, C. Vale, Charles Maguire, Y. Tsuchimoto, Ryugo S. Hayano, W. Holzmann, Maya Hachiya Shimomura, K. Imai, Sergey Fokin, B. S. Chang, Y. Riabov, T. Horaguchi, Y. I. Makdisi, Christine Angela Aidala, Kiyoshi Tanida, Kenta Shigaki, M. Rosati, I. E. Yushmanov, D. Kotchetkov, J. Klay, M. Nguyen, E. Kistenev, Anne Marie Sickles, C. R. Cleven, Johannes Peter Wessels, Alexei Khanzadeev, J. G. Lajoie, A. Morreale, T. Hachiya, A. S. Nyanin, Rachid Nouicer, A. Hadj Henni, E. Stenlund, D. Hornback, Z. Fraenkel, H. A. Gustafsson, H. Sakata, K. Das, F. Matathias, C. Haegemann, Y. Inoue, H. Harada, K. Boyle, Wei Xie, M. K. Lee, M. J. Tannenbaum, C. Zhang, A. A. Vinogradov, Kensuke Homma, M. Naglis, Dong-Hun Kim, C. L. Silva, I. J. Choi, A. Kravitz, G. R. Young, A. Taranenko, E. P. Hartouni, M. Gonin, Kazushi Miki, Jiangyong Jia, D. Mukhopadhyay, P. Constantin, Y. Goto, S. Chernichenko, B. Azmoun, Viktor Riabov, A. Král, S. Rembeczki, B. Bassalleck, M. J. Kweon, K. O. Eyser, A. K. Purwar, M. Konno, T. V. Moukhanova, K. Fujiwara, Masayasu Ishihara, K. Kurita, H. Pereira, D. Winter, Y. Nakamiya, M. Oka, Susumu Sato, G. Baksay, D. Yu Peressounko, P. Tarján, A. Dion, A. Deshpande, A. Enokizono, Herve Borel, D. Lynch, Y. Watanabe, I. Younus, A. Taketani, H. W. Van Hecke, A. Soldatov, Senta Greene, D. Kawall, V. I. Kochetkov, B. E. Norman, E. O'Brien, J. Murata, A. Kiss, V. L. Rykov, T. Dahms, Gerd Joachim Kunde, I. Shein, Z. Yasin, Henner Buesching, Alberto Baldisseri, Marcus Hohlmann, S. Bathe, Agneta Oskarsson, Y. Berdnikov, Y. Akiba, M. Mishra, S. Nagamiya, Vaclav Vrba, Klaus Johannes Reygers, O. Zaudtke, M. Virius, S. N. White, K. Nakano, W. E. Sondheim, P. A. Rukoyatkin, John Hill, Saskia Mioduszewski, H. A. Torii, Toru Sugitate, L. D. Isenhower, A. Glenn, I. Ravinovich, François Fleuret, T. Ichihara, Osamu Jinnouchi, Matthew G. Reuter, Takahiro Fusayasu, Y. Nagata, A. Shevel, T. Hester, Alexander Malakhov, V-N. Tram, D. Silvermyr, L. S. Zolin, W. J. Park, Motoi Inaba, P. D. Barnes, A. Yanovich, R. Bennett, M. Finger, J. G. Boissevain, Masashi Kaneta, C. Pinkenburg, M. Stepanov, G. Roche, J. Gosset, S. Yokkaichi, Y. J. Mao, S. Kametani, J. H. Kang, J. S. Haggerty, A. Romana, Y. S. Lai, J. Jin, E. M. Takagui, C. P. Singh, B. M. Johnson, A. Isupov, C. Suire, J. Sziklai, Brian Cole, R. S. Towell, I. Garishvili, Akio Kiyomichi, N. Kurihara, C. Y. Chi, and J. L. Charvet
Subjects: Semileptonic decay, Physics, Nuclear and High Energy Physics, Particle physics, Muon, Meson, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Hadron, 01 natural sciences, Upper and lower bounds, Spectral line, Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, Rapidity, Nuclear Experiment, 010306 general physics, Relativistic Heavy Ion Collider
Abstract: Background: Heavy-flavor production in p + p collisions is a good test of perturbative-quantum-chromodynamics (pQCD) calculations. Modification of heavy-flavor production in heavy-ion collisions relative to binary-collision scaling from p + p results, quantified with the nuclear-modification factor (R-AA), provides information on both cold-and hot-nuclear-matter effects. Midrapidity heavy-flavor R-AA measurements at the Relativistic Heavy Ion Collider have challenged parton-energy-loss models and resulted in upper limits on the viscosity-entropy ratio that are near the quantum lower bound. Such measurements have not been made in the forward-rapidity region. Purpose: Determine transverse-momentum (p(T)) spectra and the corresponding R-AA for muons from heavy-flavor meson decay in p + p and Cu + Cu collisions at root s(NN) = 200 GeV and y = 1.65. Method: Results are obtained using the semileptonic decay of heavy-flavor mesons into negative muons. The PHENIX muon-arm spectrometers measure the p(T) spectra of inclusive muon candidates. Backgrounds, primarily due to light hadrons, are determined with a Monte Carlo calculation using a set of input hadron distributions tuned to match measured-hadron distributions in the same detector and statistically subtracted. Results: The charm-production cross section in p + p collisions at root s = 200 GeV, integrated over p(T) and in the rapidity range 1.4 < y < 1.9, is found to be d(sigma e (e) over bar)/dy = 0.139 +/- 0.029 (stat)(-0.058)(+0.051) (syst) mb. This result is consistent with a perturbative fixed-order-plus-next-to-leading-log calculation within scale uncertainties and is also consistent with expectations based on the corresponding midrapidity charm-production cross section measured by PHENIX. The R-AA for heavy-flavor muons in Cu + Cu collisions is measured in three centrality bins for 1 < p(T) < 4 GeV/c. Suppression relative to binary-collision scaling (R-AA < 1) increases with centrality. Conclusions: Within experimental and theoretical uncertainties, the measured charm yield in p + p collisions is consistent with state-of-the-art pQCD calculations. Suppression in central Cu + Cu collisions suggests the presence of significant cold-nuclear-matter effects and final-state energy loss.
Published: 2012

41. Heavy-quark production inp+pand energy loss and flow of heavy quarks in Au + Au collisions atsNN=200GeV

Author: S. Y. Fung, M. Chiu, Maya Hachiya Shimomura, T. A. Shibata, Y. I. Makdisi, Z. Fraenkel, Steven E. Skutnik, S. Bathe, John Hill, Agneta Oskarsson, V. S. Pantuev, H. A. Torii, Toru Sugitate, L. D. Isenhower, Y. Berdnikov, Y. Akiba, M. Harvey, M. J. Tannenbaum, J. T. Mitchell, R. Seidl, Vladislav Manko, M. Slunečka, D. Isenhower, A. Toia, L. Mašek, M. Mishra, S. Nagamiya, Kazuhiro Tanaka, Vaclav Vrba, Klaus Johannes Reygers, H. Qu, C. Vale, Junji Tojo, B. S. Chang, Christine Angela Aidala, J. Klay, D. Mukhopadhyay, S. Rembeczki, M. Rosati, François Fleuret, D. Bucher, B. Forestier, I. Ravinovich, Y. Nagata, J. Gosset, J. P. Sullivan, R. Vértesi, K. Okada, B. Sahlmueller, H. En'yo, P. Constantin, Saskia Mioduszewski, S. N. White, S. F. Pate, Anne Marie Sickles, S. Kelly, Hideki Hamagaki, K. Aoki, G. David, F. Matathias, S. S. Ryu, M. J. Leitch, M. Gonin, J. Chiba, N. N. Ajitanand, Mate Csanad, P. Tarján, A. A. Vinogradov, Henrik Tydesjö, K. Nakano, Kensuke Homma, S. Chernichenko, H. Lim, B. Bassalleck, M. Konno, Y. Nakamiya, G. C. Mishra, G. Baksay, M. T. Bjorndal, R. Bennett, Ahmed Al-Jamel, M. Finger, Y. L. Yamaguchi, B. Komkov, Takao Sakaguchi, H. Al-Bataineh, W. E. Sondheim, Norio Saito, Takahiro Nakamura, M. A. L. Leite, C. Klein-Boesing, K. Dehmelt, A. Kiss, D. Kawall, C. L. Woody, Z. Yasin, Henner Buesching, Jiangyong Jia, Y. Goto, O. Zaudtke, A. D. Frawley, T. Tabaru, Jen-Chieh Peng, S. Yokkaichi, P. A. Rukoyatkin, H. Pei, G. R. Young, J. M. Burward-Hoy, H. Pereira, V. I. Kochetkov, Alexei Khanzadeev, J. M. Heuser, T. Ichihara, Osamu Jinnouchi, S. H. Aronson, J. Jin, E. M. Takagui, Marcus Hohlmann, M. Virius, W. Holzmann, C. P. Singh, B. M. Johnson, J. Murata, B. Azmoun, A. Král, M. J. Kweon, Y. Le Bornec, Gerd Joachim Kunde, Matthew G. Reuter, Takahiro Fusayasu, I. D. Ojha, Alexander Malakhov, Susumu Oda, T. Shohjoh, A. Durum, W. C. Smith, V. Babintsev, K. O. Eyser, K. Fujiwara, C. R. Cleven, C. Haegemann, Y. Inoue, Y. Cobigo, D. Silvermyr, V. Papavassiliou, Sébastien Gadrat, A. Isupov, C. Suire, I. Shein, D. S. Brown, Jan Rak, Xiong Wang, J. G. Boissevain, I. V. Sourikova, Masashi Kaneta, R. Pak, N. Kamihara, X. He, O. O. Omiwade, V. Peresedov, Dong Jo Kim, E. Stenlund, H. Sakata, M. K. Lee, E. H. Kim, L. S. Zolin, David D'Enterria, P. J. Kroon, Dong-Hun Kim, P. D. Barnes, J. E. Frantz, Hiroaki Ohnishi, R. Lacey, J. Sziklai, W. J. Park, Alberto Baldisseri, R. Armendariz, C. Pinkenburg, A. Yanovich, M. Oka, S. K. Tuli, R. Granier de Cassagnac, Herve Borel, D. Lynch, A. Adare, M. Naglis, Senta Greene, D. E. Fields, K. Hasuko, B. V. Jacak, Brian Cole, R. P. Pisani, C. L. Silva, R. S. Towell, M. Stepanov, G. Roche, Kazuyoshi Kurita, H. Masui, A. K. Dubey, A. Glenn, O. Dietzsch, E. T. Atomssa, Masayasu Ishihara, Y. J. Mao, S. Kametani, A. Dion, Susumu Sato, I. Garishvili, Akio Kiyomichi, M. Mitrovski, A. Deshpande, M. McCumber, A. K. Purwar, H. Valle, Alexander Milov, I. Nakagawa, H. W. Van Hecke, V. L. Rykov, T. Dahms, A. A. Bickley, A. Drees, N. Grau, J. H. Kang, J. S. Haggerty, T. V. Moukhanova, K. Shoji, J. Kubart, O. Drapier, Frank Ellinghaus, B. E. Norman, Xiao-yan Li, N. Kurihara, S. Takagi, M. Ouchida, Nikolay Tyurin, Y. Watanabe, Atsushi Taketani, K. N. Barish, E. R. Kinney, I. Younus, D. P. Morrison, S. Campbell, E. O'Brien, R. A. Soltz, Julia Velkovska, P. W. Stankus, A. Soldatov, J. Asai, A. Enokizono, M. Wysocki, V. E. Semenov, M. B. Deaton, E. J. Desmond, M. N. Wagner, Y. Fukao, G. S. Kyle, A. Shevel, M. Grosse Perdekamp, Y. Tanaka, N. Willis, James Alexander, K. S. Sim, Tatsuya Chujo, Y. S. Lai, I. Tserruya, M. G. Hur, C. Y. Chi, Tae-Yeon Lee, J. Egdemir, M. Togawa, Yu. Efremenko, V. Singh, T. K. Shea, R. Averbeck, Martin Purschke, T. Hester, Robert F. Hobbs, Byung-Sik Hong, A. Bazilevsky, Y. Kwon, Joakim Nystrand, J. Park, M. L. Brooks, Florian Bauer, Philippe Rosnet, Jason Kamin, F. Gastineau, H. Hiejima, B. Love, Alexandre Lebedev, F. Staley, L. Baksay, K. Das, D. Winter, Charles Maguire, S. Leckey, D. Yu Peressounko, D. M. Lee, Marie Germain, S. P. Stoll, Eva Haslum, B. Lenzi, Shingo Sakai, Josh Moss, Kiyoshi Tanida, Xingguo Li, Debashish Pal, Y. Tsuchimoto, J. L. Drachenberg, S. Sawada, E. P. Hartouni, A. G. Litvinenko, K. Imai, E. Kistenev, Hirohiko Sato, J. Ying, A. Franz, T. L. Thomas, H. Harada, S. S.E. Rosendahl, G. Bunce, D. Kotchetkov, A. Kozlov, R. Seto, S. P. Sorensen, K. Haruna, Dylan Walker, B. Espagnon, V. Dzhordzhadze, S. Afanasiev, A. Morreale, V-N. Tram, I. E. Yushmanov, J. G. Lajoie, A. Churyn, D. Jouan, A. Ster, T. Hachiya, Motoi Inaba, I. J. Choi, A. Kravitz, Ryugo S. Hayano, A. Romana, J. Newby, K. S. Joo, Y. Riabov, Kenta Shigaki, C. A. Ogilvie, T. K. Hemmick, D. Hornback, M. Nguyen, A. Taranenko, Yasuo Miake, Kazushi Miki, S. Esumi, D. Sharma, A. S. Nyanin, L. Kochenda, Rachid Nouicer, T. Kawagishi, S. Belikov, L. Aphecetche, Minghui Liu, M. Heffner, C. Silvestre, Kenneth Francis Read, A. V. Kazantsev, Marisilvia Donadelli, V. Bumazhnov, M. P. Comets, L. Tomášek, P. Mikeš, Andry Malala Rakotozafindrabe, T. C. Awes, Kyoichiro Ozawa, T. Liška, Jun Kikuchi, Johannes Peter Wessels, Tadaaki Isobe, J. S. Chai, P. L. McGaughey, Rushan Han, M. N. Hagiwara, M. Issah, C. Zhang, J. Zimányi, S. Butsyk, Vladimir Samsonov, M. D. Malik, I. Otterlund, E. Vznuzdaev, Viktor Riabov, W. A. Zajc, Tamas Ferenc Csorgo, V. Baublis, A. Hadj Henni, J. L. Nagle, A. Denisov, V. Cianciolo, Sergey Fokin, T. Horaguchi, K. Boyle, H. Å Gustafsson, Wei Xie, S. Batsouli, H. Iinuma, M. C. McCain, A. P.T. Palounek, H. Kanou, Taku Gunji, H. Gong, J. Seele, F. Kajihara, H. Delagrange, S. Zhou, Y. S. Kim, J. L. Charvet, T. E. Miller, P. Chung, M. Holmes, and W. S. Emam
Subjects: Quark, Physics, Nuclear and High Energy Physics, Particle physics, Range (particle radiation), Meson, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Electron, 01 natural sciences, 7. Clean energy, Spectral line, Nuclear physics, Flow (mathematics), 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Anisotropy, Relativistic Heavy Ion Collider
Abstract: Transverse momentum spectra of electrons (p(T)(e)) from semileptonic weak decays of heavy-flavor mesons in the range of 0.3 < p(T)(e) < 9.0 GeV/c have been measured at midrapidity (|y| < 0.35) by the PHENIX experiment at the Relativistic Heavy Ion Collider in p + p and Au + Au collisions at root s(NN) = 200 GeV. In addition, the azimuthal anisotropy parameter v(2) has been measured for 0.3 < p(T)(e) < 5.0 GeV/c in Au + Au collisions. The substantial modification in the p(T)(e) spectra in Au + Au compared with p + p collisions as well as the nonzero v(2) indicate substantial interactions and flow of heavy quarks in traversing the produced medium. Comparisons of these observables with detailed theoretical calculations can be used to identify the nature of these interactions and to quantify their extent.
Published: 2011

42. Event structure and double helicity asymmetry in jet production from polarizedp+pcollisions ats=200 GeV

Author: Maya Hachiya Shimomura, J. H. Kang, J. S. Haggerty, A. Romana, R. Pak, N. Kamihara, Y. I. Makdisi, Y. Nakamiya, G. Baksay, R. Armendariz, Kazuyoshi Kurita, A. Drees, J. L. Charvet, J. Kubart, E. H. Kim, Y. S. Lai, M. J. Tannenbaum, T. E. Miller, D. Mukhopadhyay, R. A. Soltz, John Hill, C. A. Ogilvie, Herve Borel, D. Lynch, S. Rembeczki, X. He, O. O. Omiwade, T. K. Hemmick, M. Grosse Perdekamp, S. P. Sorensen, H. A. Torii, Yasuo Miake, Dylan Walker, Toru Sugitate, L. D. Isenhower, J. Gosset, P. Chung, V. Peresedov, L. Kochenda, S. Yokkaichi, M. Rosati, J. G. Boissevain, Masashi Kaneta, V. L. Rykov, T. Dahms, Charles Maguire, S. Butsyk, A. Kiss, Vladimir Samsonov, L. Aphecetche, C. Pinkenburg, W. S. Emam, H. Kanou, M. Stepanov, G. Roche, Taku Gunji, H. Gong, J. Seele, R. Vértesi, A. V. Kazantsev, F. Kajihara, Z. Yasin, Henner Buesching, S. Batsouli, H. Masui, A. K. Dubey, H. Delagrange, J. Chiba, N. N. Ajitanand, A. A. Bickley, K. Dehmelt, C. R. Cleven, C. Haegemann, Y. Inoue, A. A. Vinogradov, S. Afanasiev, François Fleuret, B. Love, Marcus Hohlmann, V. S. Pantuev, S. Zhou, J. G. Lajoie, T. Hachiya, I. J. Choi, A. Kravitz, D. Winter, D. Yu Peressounko, S. F. Pate, A. Ster, J. Egdemir, Jason Kamin, Jiangyong Jia, Y. Goto, Kiyoshi Tanida, E. Kistenev, J. T. Mitchell, A. G. Litvinenko, R. Seidl, Vladislav Manko, P. MikeÅ, Takao Sakaguchi, Dong-Hun Kim, M. Slunečka, Y. L. Yamaguchi, B. Komkov, Johannes Peter Wessels, S. N. White, Tamas Ferenc Csorgo, A. Hadj Henni, J. L. Nagle, M. Gonin, Jen-Chieh Peng, Jan Rak, R. Lacey, P. Tarján, H. Al-Bataineh, Takahiro Nakamura, S. P. Stoll, J. Newby, O. Zaudtke, S. Belikov, C. Klein-Boesing, Junji Tojo, Mate Csanad, K. Boyle, M. Ouchida, Norio Saito, C. Silvestre, M. A. L. Leite, H. Harada, H. Pereira, K. Nakano, J. Asai, A. Kozlov, M. Virius, R. Seto, N. Grau, Wei Xie, R. Granier de Cassagnac, A. Adare, D. Hornback, Xiong Wang, C. Vale, B. S. Chang, J. E. Frantz, K. Haruna, A. Taranenko, S. S.E. Rosendahl, Susumu Oda, W. A. Zajc, V. Baublis, A. Denisov, V. Cianciolo, T. A. Shibata, Marisilvia Donadelli, V. Bumazhnov, M. P. Comets, Andry Malala Rakotozafindrabe, Kazushi Miki, W. E. Sondheim, K. Okada, Senta Greene, Dong Jo Kim, M. B. Deaton, Y. Tanaka, Hiroaki Ohnishi, V. Papavassiliou, Sébastien Gadrat, Christine Angela Aidala, J. Klay, B. Sahlmueller, H. En'yo, D. Isenhower, A. Toia, P. A. Rukoyatkin, T. Ichihara, Osamu Jinnouchi, A. D. Frawley, T. Tabaru, S. H. Aronson, Shingo Sakai, T. L. Thomas, Alexei Khanzadeev, E. Stenlund, H. Sakata, S. Takagi, B. E. Norman, K. N. Barish, E. O'Brien, Matthew G. Reuter, Takahiro Fusayasu, F. Matathias, K. Das, E. P. Hartouni, M. J. Leitch, A. Durum, K. Shoji, Ryugo S. Hayano, K. O. Eyser, A. K. Purwar, K. Fujiwara, Kensuke Homma, P. W. Stankus, Sergey Fokin, T. C. Awes, Y. Riabov, Kyoichiro Ozawa, Kenta Shigaki, F. Staley, L. Baksay, Rushan Han, V. Babintsev, T. Horaguchi, Jun Kikuchi, Eva Haslum, B. Lenzi, Alexander Malakhov, D. Silvermyr, Alexander Milov, A. Glenn, I. Ravinovich, M. Nguyen, I. Nakagawa, P. Constantin, Steven E. Skutnik, W. Holzmann, H. Pei, M. Mitrovski, L. S. Zolin, W. J. Park, David D'Enterria, A. S. Nyanin, S. Chernichenko, Rachid Nouicer, M. Issah, Y. Nagata, O. Drapier, Frank Ellinghaus, G. S. Kyle, O. Dietzsch, K. S. Sim, V. Dzhordzhadze, E. R. Kinney, E. T. Atomssa, M. K. Lee, Y. Kwon, Xingguo Li, D. P. Morrison, S. Campbell, B. Bassalleck, C. L. Woody, M. Wysocki, H. W. Van Hecke, H. Valle, M. D. Malik, L. TomáÅek, P. D. Barnes, E. Vznuzdaev, A. Yanovich, H. Qu, D. E. Fields, James Alexander, B. V. Jacak, V. E. Semenov, M. Konno, J. Zimányi, H. Hiejima, Tatsuya Chujo, I. Tserruya, R. Averbeck, Robert F. Hobbs, Byung-Sik Hong, T. V. Moukhanova, Yu. Efremenko, S. Bathe, H. Iinuma, V. Singh, Agneta Oskarsson, A. Bazilevsky, Minghui Liu, Hideki Hamagaki, K. Aoki, Julia Velkovska, Y. Berdnikov, G. David, A. P.T. Palounek, M. McCumber, M. N. Wagner, Philippe Rosnet, Y. Akiba, M. Mishra, S. Nagamiya, I. V. Sourikova, E. J. Desmond, Y. Fukao, A. Shevel, Debashish Pal, M. L. Brooks, K. Imai, S. Sawada, Vaclav Vrba, Klaus Johannes Reygers, T. Hester, J. Ying, A. Franz, Alexandre Lebedev, H. A. Gustafsson, M. Togawa, C. Zhang, D. M. Lee, J. Park, V-N. Tram, M. Heffner, Anne Marie Sickles, Kenneth Francis Read, Motoi Inaba, Viktor Riabov, Y. Tsuchimoto, I. E. Yushmanov, G. R. Young, Tadaaki Isobe, R. Bennett, P. L. McGaughey, M. Chiu, M. Finger, B. Azmoun, A. Král, M. J. Kweon, M. Oka, A. Dion, Atsushi Taketani, A. Enokizono, K. S. Joo, T. LiÅka, S. Esumi, D. Sharma, Tae-Yeon Lee, Martin Purschke, D. Kotchetkov, A. Morreale, Z. Fraenkel, G. Bunce, A. Churyn, D. Jouan, A. Deshpande, Y. Watanabe, I. Younus, A. Soldatov, M. Naglis, C. L. Silva, Masayasu Ishihara, Susumu Sato, D. Kawall, V. I. Kochetkov, J. Murata, Gerd Joachim Kunde, I. Shein, Alberto Baldisseri, C. P. Singh, B. M. Johnson, A. Isupov, C. Suire, J. Sziklai, Brian Cole, L. MaÅek, Saskia Mioduszewski, J. Jin, E. M. Takagui, R. S. Towell, I. Garishvili, Akio Kiyomichi, N. Kurihara, C. Y. Chi, Y. J. Mao, and S. Kametani
Subjects: Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Photon, 010308 nuclear & particles physics, media_common.quotation_subject, Lambda, 01 natural sciences, 7. Clean energy, Helicity, Asymmetry, Charged particle, Gluon, Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Event generator, media_common
Abstract: We report on the event structure and double helicity asymmetry (A(LL)) of jet production in longitudinally polarized p + p collisions at root s = 200 GeV. Photons and charged particles were measured by the PHENIX experiment at midrapidity vertical bar eta vertical bar 2 GeV/c) photon in the event. Event structure, such as multiplicity, p(T) density and thrust in the PHENIX acceptance, were measured and compared with the results from the PYTHIA event generator and the GEANT detector simulation. The shape of jets and the underlying event were well reproduced at this collision energy. For the measurement of jet A(LL), photons and charged particles were clustered with a seed-cone algorithm to obtain the cluster pT sum (p(T)(reco)). The effect of detector response and the underlying events on p(T)(reco) was evaluated with the simulation. The production rate of reconstructed jets is satisfactorily reproduced with the next-to-leading-order and perturbative quantum chromodynamics jet production cross section. For 4 = 49% we measured Lambda(LL) = -0.0014 +/- 0.0037(stat) at the lowest p(T)(reco) bin (4-5 GeV= c) and -0.0181 +/- 0.0282(stat) at the highest p(T)(reco) bin (10-12 GeV= c) with a beam polarization scale error of 9.4% and a pT scale error of 10%. Jets in the measured p(T)(reco) range arise primarily from hard-scattered gluons with momentum fraction 0: 02 < x < 0: 3 according to PYTHIA. The measured A(LL) is compared with predictions that assume various Delta G(x) distributions based on the Gluck-Reya-Stratmann-Vogelsang parameterization. The present result imposes the limit -a.1 < integral(0.3)(0.02) dx Delta G(x, mu(2) = GeV2) < 0.4 at 95% confidence level or integral(0.3)(0.002) dx Delta G(x, mu(2) = 1 GeV2) < 0.5 at 99% confidence level.
Published: 2011

43. Identified charged hadron production inp+pcollisions ats=200and 62.4 GeV

Author: S. Bathe, K. S. Sim, V. Dzhordzhadze, Y. L. Yamaguchi, B. Komkov, Agneta Oskarsson, L. Aphecetche, Y. Kwon, Mate Csanad, Y. Berdnikov, Y. Akiba, Norio Saito, Hiroaki Ohnishi, K. B. Lee, R. Yang, M. A. L. Leite, H. Hiejima, M. Rosati, M. Mishra, S. Nagamiya, Vaclav Vrba, Klaus Johannes Reygers, Alexander Milov, I. Nakagawa, T. Engelmore, K. Imai, M. Ouchida, J. S. Kapustinsky, S. N. White, V. Babintsev, N. Means, Johannes Peter Wessels, J. Asai, V. S. Pantuev, Y. Ikeda, C. M. Camacho, Tae-Yeon Lee, A. A. Vinogradov, D. Roach, K. M. Kijima, Martin Purschke, O. Drapier, Frank Ellinghaus, E. R. Kinney, D. P. Morrison, S. Campbell, David D'Enterria, C. Baumann, H. Pei, J. G. Boissevain, E. J. Mannel, S. Afanasiev, A. Ster, Prashant Shukla, S. F. Pate, Masashi Kaneta, Zvi Hirsh Citron, R. A. Soltz, Shingo Sakai, H. Liu, Anne Marie Sickles, K. O. Eyser, A. K. Purwar, K. Fujiwara, Jiangyong Jia, Y. Goto, C. P. Singh, H. Iinuma, A. P.T. Palounek, D. Kotchetkov, K. Nakano, B. M. Johnson, V. E. Semenov, J. Zimányi, J. Newby, K. A. Drees, Maya Hachiya Shimomura, Xingguo Li, M. Naglis, C. L. Silva, H. Al-Bataineh, A. Morreale, W. A. Zajc, K. Shoji, M. I. Nagy, M. Issah, V. Baublis, A. Denisov, Y. Tomita, T. L. Thomas, Junji Tojo, I. Ravinovich, E. H. Kim, Tatsuya Chujo, W. E. Sondheim, D. Ivanischev, Sergey Fokin, M. Gonin, A. Isupov, C. Suire, Z. Fraenkel, I. Tserruya, R. Pak, Yu. Efremenko, C. Pinkenburg, Y. I. Makdisi, N. Kamihara, P. A. Rukoyatkin, P. W. Stankus, Masayasu Ishihara, M. D. Malik, E. Vznuzdaev, M. Grosse Perdekamp, D. E. Fields, H. A. Gustafsson, J. Sziklai, C. Zhang, M. N. Wagner, R. Vértesi, R. K. Choudhury, Y. Nagata, V. Singh, M. Bai, B. V. Jacak, Ryugo S. Hayano, G. R. Young, K. S. Joo, Brian Cole, D. Hornback, Y. Riabov, A. Sukhanov, H. Pereira, M. Stepanov, Susumu Sato, G. Roche, Y. J. Mao, S. Butsyk, S. Kametani, T. Horaguchi, B. Meredith, Y. Morino, P. Ružička, K. Okada, H. Hamagaki, R. S. Towell, A. Hadj Henni, Minghui Liu, Vladimir Samsonov, Viktor Riabov, R. Armendariz, Kenta Shigaki, Y. Fukao, A. Shevel, M. Nguyen, M. McCumber, I. Garishvili, Akio Kiyomichi, F. Wei, Y. Onuki, T. Hester, A. Taranenko, D. Kawall, H. Themann, H. W. Van Hecke, M. J. Tannenbaum, John Hill, J. H. Kang, J. S. Haggerty, V. I. Kochetkov, Beomkyu Kim, K. Boyle, Jan Rak, Ajit Kumar Mohanty, Wei Xie, T. A. Shibata, R. Hobbs, N. Kurihara, B. Sahlmueller, Kazushi Miki, M. Heffner, A. S. Nyanin, Kenneth Francis Read, H. En'yo, M. J. Leitch, Rachid Nouicer, G. S. Kyle, James Alexander, R. Lacey, Toru Sugitate, L. D. Isenhower, Kazuyoshi Kurita, A. Drees, A. Romana, J. Murata, H. Torii, Gerd Joachim Kunde, S. Esumi, D. Sharma, R. Granier de Cassagnac, A. Adare, O. Dietzsch, Steven E. Skutnik, R. Bennett, Brajesh K. Singh, C. Y. Chi, E. T. Atomssa, M. B. Deaton, T. Sato, J. E. Frantz, M. Finger, S. Dairaku, A. V. Kazantsev, K. Das, R. Averbeck, Byung-Sik Hong, H. Valle, C. L. Woody, A. Berdnikov, A. Bazilevsky, Philippe Rosnet, R. Ichimiya, Tamas Ferenc Csorgo, K. Dehmelt, D. Mukhopadhyay, I. Shein, S. Rembeczki, Y. Tanaka, J. Kubart, Dipanwita Dutta, K. Sakashita, O. Zaudtke, V. Cianciolo, H. Qu, S. P. Sorensen, Alexandre Lebedev, Jen-Chieh Peng, Alexei Khanzadeev, Dylan Walker, M. Virius, E. P. Hartouni, V-N. Tram, N. Grau, D. M. Lee, L. Tomášek, François Fleuret, A. Kiss, J. L. Nagle, P. Mikeš, B. Azmoun, K. Sedgwick, Alberto Baldisseri, A. Král, F. Matathias, A. Deshpande, M. J. Kweon, E. Stenlund, H. Sakata, Y. S. Lai, Julia Velkovska, N. N. Ajitanand, Takahiro Nakamura, K. Aoki, K. Kiriluk, G. David, J. Egdemir, Z. Yasin, D. Winter, Motoi Inaba, I. V. Sourikova, Xiong Wang, Saskia Mioduszewski, J. Chiba, Y. Watanabe, Seong H. Kim, T. Ichihara, M. Oka, A. Yu. Semenov, Dong Jo Kim, J. G. Lajoie, T. Hachiya, D. Yu Peressounko, Susumu Oda, Jason Kamin, Osamu Jinnouchi, Henner Buesching, S. P. Stoll, A. Glenn, S. Gadrat, C. Silvestre, Kensuke Homma, T. C. Awes, A. Dion, Kyoichiro Ozawa, T. Liška, I. Younus, Takao Sakaguchi, Matthew G. Reuter, Takahiro Fusayasu, J. Gosset, A. Durum, A. Veicht, C. Klein-Boesing, F. Staley, L. Baksay, Eva Haslum, B. Lenzi, P. Tarján, T. V. Moukhanova, C. R. Cleven, C. Haegemann, Y. Inoue, S. S.E. Rosendahl, G. Bunce, Alexander Malakhov, Herve Borel, D. Lynch, Marisilvia Donadelli, V. Bumazhnov, M. P. Comets, Charles Maguire, Jun Kikuchi, Tadaaki Isobe, I. J. Choi, A. Soldatov, Atsushi Taketani, A. Enokizono, P. Liebing, A. Kravitz, J. Jin, E. M. Takagui, A. D. Frawley, T. Tabaru, Marcus Hohlmann, Andry Malala Rakotozafindrabe, D. Silvermyr, K. Yamaura, D. Isenhower, A. Toia, A. Churyn, E. J. Desmond, V. L. Rykov, T. Dahms, R. Tanabe, D. Layton, S. Huang, S. H. Aronson, P. L. McGaughey, M. Togawa, L. S. Zolin, W. J. Park, J. Park, S. Yokkaichi, T. Kempel, Dong-Hun Kim, Kiyoshi Tanida, E. Kistenev, P. D. Barnes, A. Yanovich, L. Mašek, D. Jouan, W. Holzmann, M. K. Lee, P. Constantin, S. Chernichenko, Y. Tsuchimoto, W. C. Chang, M. Chiu, H. Harada, I. E. Yushmanov, Rushan Han, C. A. Ogilvie, Senta Greene, T. K. Hemmick, B. Bassalleck, Yasuo Miake, A. T. Basye, B. E. Norman, T. Niita, B. Fadem, E. O'Brien, M. Konno, L. Kochenda, H. Kanou, Taku Gunji, H. Gong, J. T. Mitchell, J. Seele, F. Kajihara, R. Seidl, Vladislav Manko, M. Slunečka, H. Delagrange, S. Belikov, C. Vale, B. S. Chang, Christine Angela Aidala, J. Klay, Y. Nakamiya, S. Zhou, G. Baksay, S. D. Rolnick, J. L. Charvet, T. E. Miller, M. Kurosawa, P. Chung, J. Imrek, W. S. Emam, V. Papavassiliou, Debashish Pal, S. Sawada, J. Ying, A. Franz, M. Mitrovski, M. Wysocki, S. Takagi, K. N. Barish, M. L. Brooks, B. Love, A. G. Litvinenko, A. Kozlov, R. Seto, K. Haruna, X. He, O. O. Omiwade, V. Peresedov, J. Koster, S. Batsouli, H. Masui, A. K. Dubey, and A. A. Bickley
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Meson, 010308 nuclear & particles physics, Hadron, 7. Clean energy, 01 natural sciences, Nuclear physics, Baryon, Pion, Antimatter, 0103 physical sciences, Rapidity, Nuclear Experiment, 010306 general physics, Relativistic Heavy Ion Collider, Nucleon
Abstract: Transverse momentum distributions and yields for pi(+/-), K-+/-, p, and (p) over bar in p + p collisions at root s = 200 and 62.4 GeV at midrapidity are measured by the PHENIX experiment at the Relativistic Heavy Ion Collider (RHIC). These data provide important baseline spectra for comparisons with identified particle spectra in heavy ion collisions at RHIC. We present the inverse slope parameter T-inv, mean transverse momentum , and yield per unit rapidity dN/dy at each energy, and compare them to other measurements at different root s in p + p and p + (p) over bar collisions. We also present the scaling properties such as m(T) scaling and x(T) scaling on the p(T) spectra between different energies. To discuss the mechanism of the particle production in p + p collisions, the measured spectra are compared to next-to-leading-order or next-to-leading-logarithmic perturbative quantum chromodynamics calculations.
Published: 2011

44. Measurement of neutral mesons inp+pcollisions ats=200 GeVand scaling properties of hadron production

Author: X. He, O. O. Omiwade, L. Aphecetche, K. Sakashita, P. Tarján, V. Peresedov, C. L. Woody, A. Berdnikov, J. Egdemir, Jason Kamin, T. Csörgő, S. P. Stoll, W. A. Zajc, J. Koster, V. S. Pantuev, Senta Greene, V. Baublis, A. Denisov, S. S.E. Rosendahl, Johannes Peter Wessels, V. Cianciolo, Y. Tomita, G. Bunce, A. T. Basye, Maya Hachiya Shimomura, M. Rosati, B. Meredith, Sergey Fokin, I. V. Sourikova, E. H. Kim, B. E. Norman, B. Fadem, E. O'Brien, J. T. Mitchell, A. Churyn, A. V. Kazantsev, S. Batsouli, H. Masui, A. K. Dubey, C. Baumann, Junji Tojo, Anne Marie Sickles, C. P. Singh, D. Jouan, B. M. Johnson, A. Isupov, Y. I. Makdisi, M. B. Deaton, J. Sziklai, Brian Cole, John Hill, R. Seidl, A. A. Bickley, R. A. Soltz, K. Okada, Toru Sugitate, L. D. Isenhower, A. Hadj Henni, M. Grosse Perdekamp, B. Sahlmueller, Y. Tanaka, H. En'yo, G. R. Young, S. Takagi, Vladislav Manko, M. J. Leitch, M. J. Tannenbaum, Beomkyu Kim, K. Boyle, Wei Xie, H. A. Gustafsson, M. Ouchida, M. Slunečka, Mate Csanad, N. Means, J. Asai, K. N. Barish, C. A. Ogilvie, G. S. Kyle, H. Torii, François Fleuret, I. Tserruya, C. Zhang, T. K. Hemmick, James Alexander, Yu. Efremenko, M. Mitrovski, P. Ružička, D. Winter, Yasuo Miake, D. Mukhopadhyay, S. Rembeczki, R. Averbeck, Byung-Sik Hong, K. S. Sim, A. Bazilevsky, T. Ichihara, S. Belikov, L. Tomášek, D. Yu Peressounko, P. Mikeš, A. A. Vinogradov, Viktor Riabov, V. Dzhordzhadze, Y. Kwon, Matthew G. Reuter, Philippe Rosnet, Hiroaki Ohnishi, K. B. Lee, Takahiro Fusayasu, Shingo Sakai, K. A. Drees, T. L. Thomas, F. Staley, L. Baksay, V. Singh, S. Bathe, H. Pei, Alexander Malakhov, L. Kochenda, R. Yang, M. Wysocki, H. Hiejima, M. L. Brooks, H. Iinuma, J. Chiba, Ryugo S. Hayano, Y. Riabov, I. Ravinovich, Takao Sakaguchi, B. Azmoun, A. Král, M. J. Kweon, Agneta Oskarsson, M. K. Lee, Alexandre Lebedev, D. M. Lee, K. Kiriluk, Y. L. Yamaguchi, B. Komkov, Y. Berdnikov, Jiangyong Jia, Y. Goto, B. Love, Robert F. Hobbs, Y. Akiba, C. Klein-Boesing, M. I. Nagy, A. P.T. Palounek, R. Pak, N. Kamihara, C. Vale, B. S. Chang, Christine Angela Aidala, J. Klay, M. Issah, Kenta Shigaki, M. Nguyen, M. Mishra, S. Nagamiya, A. D. Frawley, T. Tabaru, K. Imai, Norio Saito, M. D. Malik, E. Vznuzdaev, R. Armendariz, M. A. L. Leite, F. Matathias, K. Das, E. P. Hartouni, David D'Enterria, Vaclav Vrba, Klaus Johannes Reygers, A. G. Litvinenko, S. Huang, Kensuke Homma, R. Vértesi, A. S. Nyanin, S. H. Aronson, Kazuyoshi Kurita, T. C. Awes, Kyoichiro Ozawa, T. Liška, Y. Onuki, K. O. Eyser, A. K. Purwar, K. Fujiwara, J. S. Kapustinsky, P. Constantin, S. Chernichenko, D. Roach, Y. Nagata, A. Drees, W. Holzmann, K. M. Kijima, C. R. Cleven, M. Oka, V. Babintsev, Jun Kikuchi, Jan Rak, Rachid Nouicer, B. Bassalleck, C. Haegemann, Y. Inoue, A. Dion, A. Kozlov, J. Kubart, R. Lacey, Ajit Kumar Mohanty, M. Bai, Debashish Pal, M. Konno, R. Seto, K. Haruna, S. Sawada, R. Granier de Cassagnac, T. A. Shibata, A. Adare, T. Sato, J. E. Frantz, Atsushi Taketani, A. Enokizono, Y. Nakamiya, P. Liebing, M. N. Wagner, Y. Fukao, J. Ying, A. Franz, H. W. Van Hecke, A. Shevel, Charles Maguire, Xingguo Li, Alexei Khanzadeev, Tae-Yeon Lee, G. Baksay, K. Dehmelt, E. Stenlund, Martin Purschke, H. Sakata, T. Hester, Kiyoshi Tanida, A. Kiss, O. Dietzsch, Jen-Chieh Peng, E. Kistenev, Z. Yasin, Henner Buesching, E. T. Atomssa, H. Valle, S. P. Sorensen, Dylan Walker, Dipanwita Dutta, D. Isenhower, T. V. Moukhanova, C. M. Camacho, D. Kotchetkov, Marcus Hohlmann, Prashant Shukla, A. Toia, E. J. Desmond, H. Harada, A. Morreale, Julia Velkovska, V-N. Tram, N. Grau, S. F. Pate, Minghui Liu, L. Mašek, Seong H. Kim, D. E. Fields, M. Togawa, J. Park, T. Kempel, Dong-Hun Kim, Xiong Wang, B. V. Jacak, Z. Fraenkel, Motoi Inaba, M. Heffner, J. G. Lajoie, Y. Tsuchimoto, T. Hachiya, R. Bennett, T. Niita, Dong Jo Kim, Osamu Jinnouchi, Kenneth Francis Read, I. E. Yushmanov, H. Al-Bataineh, I. J. Choi, A. Kravitz, M. McCumber, R. K. Choudhury, Tadaaki Isobe, M. Gonin, K. S. Joo, J. L. Charvet, V. Papavassiliou, M. Finger, Sébastien Gadrat, A. Veicht, P. L. McGaughey, A. Sukhanov, H. Pereira, M. Chiu, Y. Morino, T. E. Miller, M. Kurosawa, Christophe Pierre Suire, Alexander Milov, I. Nakagawa, T. Engelmore, O. Drapier, Frank Ellinghaus, S. Esumi, N. N. Ajitanand, E. R. Kinney, Herve Borel, D. P. Morrison, S. Campbell, D. Lynch, D. Sharma, V. E. Semenov, J. Zimányi, R. Ichimiya, Tatsuya Chujo, P. Chung, Eva Haslum, B. Lenzi, Steven E. Skutnik, J. Imrek, V. L. Rykov, T. Dahms, Takahiro Nakamura, S. Dairaku, W. S. Emam, S. Afanasiev, O. Zaudtke, Susumu Oda, A. Ster, H. Kanou, Taku Gunji, H. Gong, J. Seele, M. Virius, F. Kajihara, J. Newby, H. Delagrange, A. Durum, K. Yamaura, S. Zhou, A. Glenn, S. D. Rolnick, D. Hornback, H. Qu, A. Taranenko, Kazushi Miki, Hideki Hamagaki, K. Aoki, D. Silvermyr, L. S. Zolin, W. J. Park, P. D. Barnes, A. Yanovich, G. David, Brajesh K. Singh, H. Liu, S. N. White, K. Shoji, Zvi Hirsh Citron, K. Nakano, P. W. Stankus, W. E. Sondheim, D. Ivanischev, Saskia Mioduszewski, P. A. Rukoyatkin, J. Jin, E. M. Takagui, R. S. Towell, I. Garishvili, Akio Kiyomichi, F. Wei, N. Kurihara, C. Y. Chi, Y. Ikeda, J. G. Boissevain, E. J. Mannel, Masashi Kaneta, C. Pinkenburg, M. Stepanov, G. Roche, Y. J. Mao, S. Kametani, T. Horaguchi, J. H. Kang, J. S. Haggerty, A. Romana, Y. S. Lai, A. Yu. Semenov, J. Gosset, S. Butsyk, Vladimir Samsonov, S. Yokkaichi, J. L. Nagle, C. Silvestre, Marisilvia Donadelli, V. Bumazhnov, M. P. Comets, Andry Malala Rakotozafindrabe, R. Tanabe, D. Layton, W. C. Chang, Rushan Han, D. Kawall, H. Themann, V. I. Kochetkov, J. Murata, Gerd Joachim Kunde, I. Shein, K. Sedgwick, Alberto Baldisseri, M. Naglis, C. L. Silva, Masayasu Ishihara, Susumu Sato, A. Deshpande, Y. Watanabe, I. Younus, and A. Soldatov
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Meson, 010308 nuclear & particles physics, Hadron, Omega baryon, 01 natural sciences, 7. Clean energy, Omega, Nuclear physics, Baryon, Particle decay, 0103 physical sciences, Tsallis distribution, Nuclear Experiment, 010306 general physics, Relativistic Heavy Ion Collider
Abstract: The PHENIX experiment at the Relativistic Heavy Ion Collider has measured the invariant differential cross section for production of K-S(0), omega, eta', and phi mesons in p + p collisions at root s 200 GeV. Measurements of omega and phi production in different decay channels give consistent results. New results for the omega are in agreement with previously published data and extend the measured p(T) coverage. The spectral shapes of all hadron transverse momentum distributions measured by PHENIX are well described by a Tsallis distribution functional form with only two parameters, n and T, determining the high-p(T) and characterizing the low-p(T) regions of the spectra, respectively. The values of these parameters are very similar for all analyzed meson spectra, but with a lower parameter T extracted for protons. The integrated invariant cross sections calculated from the fitted distributions are found to be consistent with existing measurements and with statistical model predictions.
Published: 2011

45. Nuclear modification factors ofϕmesons ind+Au,Cu+Cu, andAu+Aucollisions atsNN=200 GeV

Author: Aaron Angerami, J. M. Burward-Hoy, W. A. Zajc, V. Baublis, A. Denisov, V. Cianciolo, Hongfang Liu, D. E. Fields, W. C. Smith, H. A. Gustafsson, C. Zhang, B. V. Jacak, P. Ružička, Viktor Riabov, Sergey Fokin, T. Horaguchi, M. McCumber, A. K. Purwar, M. K. Lee, J. L. Drachenberg, R. A. Soltz, H. Borel, Gary Grim, S. Batsouli, K. V. Dharmawardane, M. Grosse Perdekamp, J. Hanks, Prashant Shukla, S. F. Pate, Marisilvia Donadelli, V. Bumazhnov, M. P. Comets, M. E. Connors, K. A. Drees, J. Gosset, A. V. Kazantsev, S. Belikov, K. S. Joo, J. L. Charvet, H. Iinuma, M. C. McCain, A. P.T. Palounek, Ke. Nakamura, V. S. Pantuev, Sung Keun Park, S. Kelly, N. N. Ajitanand, J. P. Sullivan, K. Sakashita, D. Watanabe, M. D. Malik, T. E. Miller, K. Tanida, E. Vznuzdaev, Takahiro Nakamura, T. Jones, J. Hamblen, Peter Christiansen, S. P. Sorensen, K. Watanabe, M. Rosati, L. Tomášek, R. Tanabe, H. Al-Bataineh, K. Das, A. Enokizono, Dylan Walker, K. Shoji, D. Winter, D. Yu Peressounko, Y. Fukao, Susumu Oda, A. Shevel, P. Mikeš, P. Tarján, P. Chung, D. Kotov, N. Apadula, R. Vértesi, K. Okada, M. Holmes, E. P. Hartouni, B. Sahlmueller, T. Shohjoh, A. Durum, X. Jiang, S. Yokkaichi, H. En'yo, S. V. Afanasiev, Catherine Micaela Silvestre, L. Aphecetche, P. W. Stankus, P. Constantin, M. J. Leitch, W. S. Emam, A. Datta, D. S. Brown, K. Yamaura, H. Kanou, Y. Ikeda, S. Bathe, J. G. Boissevain, T. Hester, J. Egdemir, Taku Gunji, H. Gong, J. Seele, Masashi Kaneta, T. Tabaru, Senta Greene, F. Kajihara, Agneta Oskarsson, A. Dion, M. I. Nagy, T. C. Awes, H. Delagrange, S. Esumi, Kyoichiro Ozawa, T. Liška, C. Pinkenburg, A. T. Basye, Johannes Peter Wessels, J. S. Bok, O. Chvala, Jun Kikuchi, C. R. Cleven, B. E. Norman, B. Fadem, E. O'Brien, D. Sharma, R. Ichimiya, Jason Kamin, Rushan Han, M. N. Hagiwara, Y. Berdnikov, C. Haegemann, Y. Inoue, A. Hadj Henni, V. Papavassiliou, Sébastien Gadrat, Xiao-yan Li, T. Murakami, M. Stepanov, Robert F. Hobbs, G. Roche, S. Kametani, S. Butsyk, S. Zhou, A. A. Vinogradov, Henrik Tydesjö, Y. Akiba, B. Azmoun, Y. J. Mao, M. Mishra, A. Král, M. J. Kweon, J. H. Kang, Beomkyu Kim, J. S. Haggerty, P. J. Kroon, Wei Xie, Vladimir Samsonov, I. Otterlund, A. Baldisseri, A. Romana, S. Nagamiya, Kazuhiro Tanaka, S. P. Stoll, T. Kempel, S. D. Rolnick, Masamichi Ishihara, Y. Le Bornec, Y. S. Kim, Dong-Hun Kim, S. W. Nam, Vaclav Vrba, Minghui Liu, B. Komkov, Klaus Johannes Reygers, Jiangyong Jia, Y. Goto, M. Chiu, Ajit Kumar Mohanty, Debashish Pal, M. Heffner, Kenneth Francis Read, Tamas Ferenc Csorgo, T. A. Shibata, C. L. Silva, T. Sato, T. Ichihara, Y. S. Lai, J. L. Nagle, J. Murata, M. Oka, S. Sawada, Tadaaki Isobe, J. Ying, A. Franz, Steven E. Skutnik, K. S. Lee, J. S. Chai, Margaret Harvey, V-N. Tram, N. Grau, Norio Saito, Tsutomu Mibe, D. Isenhower, A. Toia, S. S.E. Rosendahl, G. Bunce, M. Slunečka, P. L. McGaughey, B. Espagnon, P. Liebing, Tae-Yeon Lee, M. A. L. Leite, J. G. Lajoie, L. Mašek, Martin Purschke, F. Gastineau, D. Kotchetkov, H. Qu, Alexei Khanzadeev, A. Morreale, Z. Fraenkel, A. Kiss, Motoi Inaba, T. Hachiya, Hideki Hamagaki, K. Aoki, G. David, K. I. Hahn, R. K. Choudhury, A. Churyn, R. Belmont, J. S. Kapustinsky, R. M. Wright, Mate Csanad, M. Mitrovski, V. Babintsev, Z. Yasin, Henner Buesching, E. Stenlund, D. Jouan, G. S. Kyle, Steve Edwards, N. Willis, J. B. Choi, H. Sakata, James Alexander, O. Dietzsch, R. Averbeck, Byung-Sik Hong, A. Bazilevsky, M. Nihashi, E. T. Atomssa, H. Valle, I. J. Choi, A. Kravitz, Philippe Rosnet, J. M. Heuser, Marcus Hohlmann, Alexandre Lebedev, David D'Enterria, Dipanwita Dutta, D. M. Lee, C. A. Ogilvie, Julia Velkovska, R. P. Pisani, M. Gonin, Maya Hachiya Shimomura, M. K. Dayananda, L. A. Linden Levy, T. K. Hemmick, M. Wysocki, J. M. Durham, Nikolay Tyurin, J. H. Bhom, Yasuo Miake, K. O. Eyser, K. Fujiwara, M. N. Wagner, Y. L. Yamaguchi, Y. I. Makdisi, T. V. Moukhanova, L. Kochenda, M. Issah, Dmitry Blau, A. Sukhanov, M. B. Deaton, K. Kurita, H. Pereira, H. W. Van Hecke, Y. Morino, T. Kawagishi, E. J. Desmond, R. Pak, Hiroaki Ohnishi, K. B. Lee, Y. Tanaka, E. Mannel, M. Togawa, E. Vazquez-Zambrano, T. K. Shea, J. Park, Florian Bauer, N. Kamihara, M. J. Tannenbaum, A. Rakotozafindrabe, Aram Kim, M. Kasai, R. Armendariz, Y. Tsuchimoto, Y. Iwanaga, H. Torii, I. E. Yushmanov, C. Oakley, A. Drees, Eun-Hee Kim, H. J. Moon, L. Baksay, J. Kubart, Charles Maguire, S. Leckey, D. Mukhopadhyay, S. Rembeczki, D. Bucher, Josh Moss, D. Kawall, J. Chiba, Alice Mignerey, E. Kistenev, H. Themann, L. D'Orazio, V. I. Kochetkov, G. C. Mishra, P. Lichtenwalner, Takao Sakaguchi, M. Kurosawa, Y. Nakamiya, D. Lynch, C. Klein-Boesing, Gerd Joachim Kunde, H. Harada, I. Shein, A. D. Frawley, H. Pei, G. Baksay, Saskia Mioduszewski, M. T. Bjorndal, K. Sedgwick, S. Huang, S. H. Aronson, S. Dairaku, A. Deshpande, W. Holzmann, O. Zaudtke, Y. J. Kim, J. T. Mitchell, Y. Watanabe, R. Seidl, I. Younus, A. Soldatov, Vladislav Manko, M. Naglis, J. Jin, M. Virius, Susumu Sato, E. M. Takagui, F. Staley, C. Vale, B. S. Chang, R. S. Towell, Christine Angela Aidala, J. Klay, N. Borggren, C. H. Chen, I. Garishvili, Akio Kiyomichi, F. Wei, F. Matathias, Y. Cobigo, Kensuke Homma, E. Richardson, X. He, O. O. Omiwade, S. Chernichenko, J. E. Frantz, Jongmin Lee, H. Lim, Y. Aramaki, V. Peresedov, B. Bassalleck, N. Kurihara, J. Koster, M. Konno, H. Masui, A. K. Dubey, A. Glenn, A. Taketani, A. A. Bickley, D. S. Jumper, B. Love, Marie Germain, V. L. Rykov, T. Dahms, M. G. Hur, C. Y. Chi, A. G. Litvinenko, I. Ravinovich, A. Kozlov, Y. Nagata, R. Seto, M. Bai, K. Haruna, S. S. Ryu, C. Baumann, V. Dzhordzhadze, I. Danchev, S. Takagi, K. N. Barish, Zhiying You, R. Bennett, M. Kawashima, K. S. Sim, C. P. Singh, B. M. Johnson, Ahmed Al-Jamel, M. Finger, S. Sano, Junji Tojo, Y. Kwon, R. J. Petti, R. Yang, H. Hiejima, M. Ouchida, N. Means, A. Isupov, C. Suire, J. Sziklai, I. Tserruya, M. L. Brooks, S. Taneja, Yu. Efremenko, J. Asai, Brian Cole, V. Singh, K. Imai, Shingo Sakai, Hirohiko Sato, S. K. Tuli, Eunja Kim, T. L. Thomas, K. Dehmelt, Jen-Chieh Peng, S. Y. Fung, K. Karatsu, Inkyu Park, Xiong Wang, Z. Conesa del Valle, Anne Marie Sickles, Dong Jo Kim, B. Meredith, A. Veicht, Ryugo S. Hayano, Alexander Milov, I. Nakagawa, T. Engelmore, O. Drapier, John Hill, Frank Ellinghaus, E. R. Kinney, Y. Riabov, D. P. Morrison, S. Campbell, V. E. Semenov, J. Zimányi, Kenta Shigaki, G. R. Young, Tatsuya Chujo, Toru Sugitate, M. Nguyen, L. D. Isenhower, Y. Onuki, A. Ster, D. Roach, K. M. Kijima, A. S. Nyanin, Jan Rak, J. Newby, Rachid Nouicer, Xingguo Li, M. Proissl, R. Lacey, D. Hornback, François Fleuret, B. Forestier, A. Taranenko, Kazushi Miki, Brajesh K. Singh, R. Granier de Cassagnac, A. Adare, C. L. Woody, A. Berdnikov, K. Hasuko, S. Tarafdar, S. N. White, A. Caringi, Joakim Nystrand, Eva Haslum, B. Lenzi, Deepa Thomas, I. V. Sourikova, Zvi Hirsh Citron, K. Nakano, W. E. Sondheim, D. Ivanischev, K. Boyle, P. A. Rukoyatkin, Osamu Jinnouchi, Matthew G. Reuter, Takahiro Fusayasu, I. D. Ojha, Alexander Malakhov, D. Silvermyr, L. S. Zolin, W. J. Park, Christopher Rosen, P. D. Barnes, and A. Yanovich
Subjects: Physics, Nuclear and High Energy Physics, Valence (chemistry), Meson, Proton, 010308 nuclear & particles physics, Hadron, Phi meson, 01 natural sciences, 7. Clean energy, Baryon, Nuclear physics, Antiproton, 0103 physical sciences, Atomic physics, Nuclear Experiment, 010306 general physics, Relativistic Heavy Ion Collider
Abstract: The PHENIX experiment at the Relativistic Heavy Ion Collider has performed systematic measurements of phi meson production in the K+K- decay channel at midrapidity in p + p, d + Au, Cu + Cu, and Au + Au collisions at root s(NN) = 200 GeV. Results are presented on the phi invariant yield and the nuclear modification factor R-AA for Au + Au and Cu + Cu, and R-dA for d + Au collisions, studied as a function of transverse momentum (1 < p(T) < 7 GeV/c) and centrality. In central and midcentral Au + Au collisions, the R-AA of phi exhibits a suppression relative to expectations from binary scaled p + p results. The amount of suppression is smaller than that of the pi(0) and the. in the intermediate p(T) range (2-5 GeV/c), whereas, at higher p(T), the phi, pi(0), and. show similar suppression. The baryon (proton and antiproton) excess observed in central Au + Au collisions at intermediate p(T) is not observed for the phi meson despite the similar masses of the proton and the phi. This suggests that the excess is linked to the number of valence quarks in the hadron rather than its mass. The difference gradually disappears with decreasing centrality, and, for peripheral collisions, the R-AA values for both particle species are consistent with binary scaling. Cu + Cu collisions show the same yield and suppression as Au + Au collisions for the same number of N-part. The R-dA of phi shows no evidence for cold nuclear effects within uncertainties.
Published: 2011

46. HighpTdirect photon andπ0triggered azimuthal jet correlations and measurement ofkTfor isolated direct photons inp+pcollisions ats=200 GeV

Author: Ajit Kumar Mohanty, P. Tarján, T. A. Shibata, T. Sato, David D'Enterria, S. Bathe, Agneta Oskarsson, Alexander Milov, I. Nakagawa, T. Engelmore, O. Drapier, Frank Ellinghaus, Y. Nakamiya, Y. Berdnikov, Y. Akiba, A. V. Kazantsev, E. R. Kinney, D. P. Morrison, S. Campbell, M. Mishra, D. Isenhower, A. Toia, S. Nagamiya, V. E. Semenov, M. N. Wagner, J. Zimányi, C. Baumann, D. Lynch, Tatsuya Chujo, G. Baksay, L. Tomášlek, C. P. Singh, Tae-Yeon Lee, Martin Purschke, L. Mašek, Vaclav Vrba, Klaus Johannes Reygers, I. Tserruya, Yu. Efremenko, S. Butsyk, Vladimir Samsonov, K. Dehmelt, Jen-Chieh Peng, Senta Greene, B. M. Johnson, Xiong Wang, V. Singh, Dong Jo Kim, G. S. Kyle, Osamu Jinnouchi, A. Veicht, James Alexander, A. Isupov, C. Suire, Y. Fukao, T. Niita, A. Shevel, A. T. Basye, B. E. Norman, Maya Hachiya Shimomura, M. Naglis, C. L. Silva, P. Mikeš, J. Sziklai, Y. J. Mao, J. T. Mitchell, S. Kametani, T. Horaguchi, V. L. Rykov, T. Dahms, R. Averbeck, Byung-Sik Hong, Brian Cole, D. Kotchetkov, T. Hester, B. Fadem, I. Ravinovich, Y. I. Makdisi, E. O'Brien, A. Bazilevsky, R. Seidl, J. L. Charvet, Vladislav Manko, M. Slunečka, M. Mitrovski, Philippe Rosnet, B. Love, R. S. Towell, A. Morreale, I. Garishvili, Akio Kiyomichi, F. Wei, Masayasu Ishihara, Y. Nagata, K. O. Eyser, A. K. Purwar, M. Bai, K. Fujiwara, Z. Fraenkel, S. Belikov, Tamas Ferenc Csorgo, R. A. Soltz, H. Borel, E. J. Desmond, T. C. Awes, Kyoichiro Ozawa, T. Liška, T. E. Miller, M. Kurosawa, Jun Kikuchi, H. Iinuma, Alexandre Lebedev, O. Dietzsch, N. Kurihara, E. T. Atomssa, M. J. Tannenbaum, A. G. Litvinenko, D. M. Lee, C. Vale, B. S. Chang, J. L. Nagle, M. Togawa, K. S. Sim, V. Dzhordzhadze, M. Grosse Perdekamp, H. Torii, J. Park, Christine Angela Aidala, R. K. Choudhury, J. Klay, Y. Kwon, H. Valle, Susumu Sato, C. Y. Chi, V-N. Tram, N. Grau, Dipanwita Dutta, Tadaaki Isobe, A. P.T. Palounek, C. A. Ogilvie, K. S. Joo, M. E. Connors, P. Chung, R. Yang, R. Bennett, J. H. Kang, J. S. Haggerty, A. Romana, D. Mukhopadhyay, A. Kozlov, S. Rembeczki, J. Imrek, H. Hiejima, C. L. Woody, A. Berdnikov, K. A. Drees, F. Staley, K. Kiriluk, T. K. Hemmick, M. Wysocki, S. Taneja, R. Seto, K. Haruna, Y. Tsuchimoto, F. Matathias, Saskia Mioduszewski, M. Finger, H. A. Gustafsson, H. W. Van Hecke, Yasuo Miake, P. L. McGaughey, Eva Haslum, J. Chiba, W. S. Emam, M. K. Lee, B. Lenzi, H. Liu, Kensuke Homma, K. Imai, K. Shoji, Motoi Inaba, Julia Velkovska, I. E. Yushmanov, M. Chiu, M. Rosati, P. Constantin, S. Chernichenko, E. H. Kim, S. Dairaku, X. He, O. O. Omiwade, C. Zhang, Alexei Khanzadeev, H. Kanou, Taku Gunji, H. Gong, J. Seele, O. Zaudtke, D. Sharma, D. Winter, D. Kawall, S. Afanasiev, P. W. Stankus, L. Kochenda, B. Bassalleck, A. Ster, H. Themann, J. Jin, M. Konno, V. Peresedov, E. Stenlund, H. Sakata, E. M. Takagui, Takao Sakaguchi, R. Ichimiya, P. Ružička, D. Yu Peressounko, A. Kiss, Marisilvia Donadelli, V. Bumazhnov, M. P. Comets, C. Klein-Boesing, J. Newby, J. Koster, F. Kajihara, H. Delagrange, Anne Marie Sickles, M. Virius, B. Azmoun, A. Král, M. J. Kweon, K. Sakashita, A. D. Frawley, T. Tabaru, Robert F. Hobbs, Andry Malala Rakotozafindrabe, Viktor Riabov, Y. S. Lai, S. Batsouli, H. Masui, A. K. Dubey, Z. Yasin, Henner Buesching, V. I. Kochetkov, S. Huang, S. H. Aronson, A. A. Bickley, R. Tanabe, D. Layton, V. S. Pantuev, J. Murata, I. V. Sourikova, J. Egdemir, D. Hornback, Minghui Liu, A. A. Vinogradov, S. Takagi, Jason Kamin, S. Esumi, M. Heffner, S. Zhou, W. Holzmann, K. N. Barish, A. Baldisseri, S. D. Rolnick, M. Oka, C. R. Cleven, G. R. Young, C. Haegemann, Y. Inoue, Junji Tojo, S. P. Stoll, Kenneth Francis Read, A. Taranenko, Jiangyong Jia, Y. Goto, Y. L. Yamaguchi, B. Komkov, A. Dion, T. V. Moukhanova, Gerd Joachim Kunde, I. Shein, W. C. Chang, W. A. Zajc, Y. Ikeda, J. G. Boissevain, E. J. Mannel, Masashi Kaneta, A. Glenn, Kazushi Miki, V. Baublis, A. Denisov, V. Cianciolo, K. Das, R. Vértesi, Y. Onuki, Atsushi Taketani, Marcus Hohlmann, Brajesh K. Singh, S. S.E. Rosendahl, G. Bunce, A. Enokizono, M. Ouchida, T. Kempel, Dong-Hun Kim, K. Sedgwick, P. Liebing, Norio Saito, T. Ichihara, M. A. L. Leite, A. Deshpande, Y. Tomita, Jan Rak, Sergey Fokin, M. L. Brooks, Rushan Han, K. Okada, E. P. Hartouni, R. Lacey, N. Means, J. Asai, B. Sahlmueller, A. Churyn, D. Jouan, Debashish Pal, C. Pinkenburg, R. Granier de Cassagnac, A. Adare, J. E. Frantz, H. En'yo, M. J. Leitch, Steven E. Skutnik, R. Pak, N. Kamihara, S. Sawada, Y. Watanabe, J. S. Kapustinsky, M. Stepanov, G. Roche, A. Yu. Semenov, V. Babintsev, I. Younus, Shingo Sakai, T. L. Thomas, R. Armendariz, J. Ying, A. Franz, H. Qu, Kazuyoshi Kurita, A. Soldatov, J. Gosset, Matthew G. Reuter, A. Drees, Takahiro Fusayasu, J. Kubart, Ryugo S. Hayano, Hideki Hamagaki, K. Aoki, G. David, Y. Riabov, Kenta Shigaki, S. Yokkaichi, M. Nguyen, A. S. Nyanin, Rachid Nouicer, Alexander Malakhov, C. M. Camacho, Prashant Shukla, S. F. Pate, D. Silvermyr, H. Al-Bataineh, L. S. Zolin, W. J. Park, V. Papavassiliou, Sébastien Gadrat, P. D. Barnes, A. Yanovich, S. N. White, Zvi Hirsh Citron, K. Nakano, W. E. Sondheim, D. Ivanischev, P. A. Rukoyatkin, B. Meredith, John Hill, Toru Sugitate, L. D. Isenhower, François Fleuret, Hiroaki Ohnishi, K. B. Lee, D. Roach, K. M. Kijima, Xingguo Li, M. Gonin, A. Sukhanov, H. Pereira, Y. Morino, D. E. Fields, B. V. Jacak, M. B. Deaton, Y. Tanaka, M. McCumber, A. Hadj Henni, S. P. Sorensen, Dylan Walker, Beomkyu Kim, K. Boyle, Seong H. Kim, Wei Xie, J. G. Lajoie, T. Hachiya, N. N. Ajitanand, L. Baksay, I. J. Choi, A. Kravitz, Takahiro Nakamura, Charles Maguire, Susumu Oda, A. Durum, Catherine Micaela Silvestre, K. Yamaura, Kiyoshi Tanida, E. Kistenev, H. Harada, H. Pei, M. I. Nagy, M. Issah, M. D. Malik, E. Vznuzdaev, L. Aphecetche, Johannes Peter Wessels, and Mate Csanad
Subjects: Elastic scattering, Physics, Nuclear and High Energy Physics, Photon, Meson, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Hadron, Compton scattering, Elementary particle, 7. Clean energy, 01 natural sciences, Gluon, Nuclear physics, Pion, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics
Abstract: Correlations of charged hadrons of 1< p(T) < 10 Gev/c with high pT direct photons and pi(0) mesons in the range 5< p(T) < 15 Gev/c are used to study jet fragmentation in the gamma + jet and dijet channels, respectively. The magnitude of the partonic transverse momentum, k(T), is obtained by comparing to a model incorporating a Gaussian kT smearing. The sensitivity of the associated charged hadron spectra to the underlying fragmentation function is tested and the data are compared to calculations using recent global fit results. The shape of the direct photon-associated hadron spectrum as well as its charge asymmetry are found to be consistent with a sample dominated by quark-gluon Compton scattering. No significant evidence of fragmentation photon correlated production is observed within experimental uncertainties.
Published: 2010

47. Enhanced Production of Direct Photons inAu+AuCollisions atsNN=200 GeVand Implications for the Initial Temperature

Author: V. Peresedov, Marisilvia Donadelli, S. Y. Fung, H. Kanou, H. Gong, J. Seele, V. Bumazhnov, M. P. Comets, F. Kajihara, K. Hasuko, J. Rak, Hiroyuki Okada, Joakim Nystrand, D. J. Kim, F. Matathias, H. Masui, A. K. Dubey, E. J. Desmond, Eva Haslum, B. Lenzi, Kensuke Homma, S. Afanasiev, A. Ster, J. Newby, Charles Maguire, S. Leckey, A. A. Bickley, D. Hornback, M. Heffner, A. Taranenko, Kazushi Miki, John Hill, S. Zhou, M. Togawa, S. Chernichenko, Anne Marie Sickles, C. P. Singh, A. Deshpande, H. Lim, B. M. Johnson, Josh Moss, B. Bassalleck, A. Baldisseri, J. Park, Florian Bauer, I. Ravinovich, J. Egdemir, A. Isupov, C. Suire, P. Tarján, L. D. Isenhower, Y. S. Kim, B. Love, Y. Nagata, M. Konno, M. Gonin, J. Sziklai, G. R. Young, K. Shigaki, E. Kistenev, Y. Tsuchimoto, J. L. Charvet, François Fleuret, I. Tserruya, Yu. Efremenko, V. Singh, S. S. Ryu, Rushan Han, M. N. Hagiwara, Jason Kamin, S. P. Stoll, W. A. Zajc, V. Baublis, Brian Cole, Y. Watanabe, B. Forestier, D. E. Fields, J. T. Mitchell, Mate Csanad, I. Younus, V. S. Pantuev, T. E. Miller, R. Vértesi, H. Pereira, B. V. Jacak, H. Harada, M. Mitrovski, Y. L. Yamaguchi, A. G. Litvinenko, R. Bennett, A. Denisov, V. Cianciolo, M. Harvey, J. H. Kang, M. Wysocki, Hirohiko Sato, T. Ichihara, S. Butsyk, P. Chung, R. Seidl, Vladislav Manko, S. S.E. Rosendahl, M. Slunečka, M. McCumber, A. K. Purwar, G. Bunce, Vladimir Samsonov, I. Otterlund, Ahmed Al-Jamel, A. Soldatov, Robert F. Hobbs, S. K. Tuli, M. Finger, Junji Tojo, Matthew G. Reuter, M. Holmes, A. Kozlov, Saskia Mioduszewski, Takahiro Fusayasu, J. Chiba, Senta Greene, K. S. Sim, O. Zaudtke, Y. Kwon, M. Naglis, C. L. Silva, R. Seto, K. Haruna, I. D. Ojha, Alexander Malakhov, ShinIchi Esumi, K. Dehmelt, H. Hiejima, B. Komkov, Tamas Ferenc Csorgo, A. Churyn, D. Jouan, K. Okada, B. Sahlmueller, G. C. Mishra, H. Pei, H. En'yo, Jen-Chieh Peng, B. E. Norman, E. O'Brien, P. Constantin, O. Dietzsch, V. Dzhordzhadze, D. Silvermyr, A. Kiss, L. S. Zolin, W. J. Park, Z. Yasin, C. Vale, S. Takagi, J. L. Drachenberg, J. Jin, E. M. Takagui, T. Horaguchi, M. J. Leitch, K. Imai, Xiong Wang, J. L. Nagle, Osamu Jinnouchi, David D'Enterria, S. P. Sorensen, M. Virius, Dylan Walker, Norio Saito, E. T. Atomssa, Christine Angela Aidala, Masayasu Ishihara, Susumu Sato, J. Klay, H. Borel, Tae-Yeon Lee, Martin Purschke, T. Chujo, N. Grau, K. N. Barish, K. Shoji, P. D. Barnes, A. Yanovich, H. Valle, F. Gastineau, S. Kelly, R. S. Towell, M. A. L. Leite, I. Garishvili, Akio Kiyomichi, S. Batsouli, N. N. Ajitanand, W. S. Emam, Takao Sakaguchi, Y. Mao, J. M. Burward-Hoy, B. Chang, M. Chiu, T. A. Shibata, Debashish Pal, S. Sawada, J. Ying, A. Franz, B. Espagnon, Y. Nakamiya, F. Staley, D. Kawall, K. Das, S. Gadrat, Marcus Hohlmann, M. Grosse Perdekamp, N. Kurihara, Alexander Milov, I. Nakagawa, E. P. Hartouni, E. Stenlund, H. Sakata, C. Klein-Boesing, C. A. Ogilvie, T. K. Hemmick, K. Tanida, S. F. Pate, Julia Velkovska, Takahiro Nakamura, O. Drapier, Frank Ellinghaus, A. D. Frawley, R. Lacey, T. Tabaru, P. W. Stankus, E. R. Kinney, S. N. White, D. P. Morrison, V. I. Kochetkov, Y. Cobigo, W. C. Smith, R. Granier de Cassagnac, M. Rosati, J. G. Lajoie, Susumu Oda, M. G. Hur, C. Y. Chi, G. Baksay, T. Hachiya, A. Adare, S. Campbell, D. Kotchetkov, R. P. Pisani, V. E. Semenov, Nikolay Tyurin, P. Rosnet, J. Zimányi, H. Al-Bataineh, J. Murata, L. Kochenda, T. Shohjoh, K. Ozawa, A. Durum, Steven E. Skutnik, S. H. Aronson, S. Bathe, M. K. Lee, I. J. Choi, A. Morreale, V. Babintsev, J. E. Frantz, M. C. McCain, M. T. Bjorndal, Catherine Micaela Silvestre, A. Kravitz, D. Winter, Hiroaki Ohnishi, D. Isenhower, Y. Akiba, K. Nakano, Gerd Joachim Kunde, W. Holzmann, M. N. Wagner, I. Shein, M. Mishra, A. Toia, E. H. Kim, A. A. Vinogradov, Henrik Tydesjö, T. Kawagishi, D. S. Brown, M. L. Brooks, D. Yu Peressounko, S. Nagamiya, Kazuhiro Tanaka, Maya Hachiya Shimomura, Y. Fukao, A. Shevel, Z. Fraenkel, V. Papavassiliou, Vaclav Vrba, A. Rakotozafindrabe, W. E. Sondheim, A. P.T. Palounek, D. Lynch, H. Qu, R. Pak, L. Mašek, Y. Berdnikov, T. V. Moukhanova, Klaus Johannes Reygers, Y. I. Makdisi, A. Oskarsson, Jiangyong Jia, Y. Goto, I. Yushmanov, T. Gunji, Y. Miake, H. Buesching, P. A. Rukoyatkin, N. Kamihara, S. Fokin, J. P. Wessels, K. O. Eyser, K. Fujiwara, T. C. Awes, S. Belikov, K. S. Joo, K. Aoki, A. Glenn, G. David, R. Armendariz, Xiao-yan Li, T. Hester, Xingguo Li, V. L. Rykov, T. Dahms, Kazuyoshi Kurita, H. A. Gustafsson, M. B. Deaton, G. S. Kyle, A. Drees, M. J. Tannenbaum, N. Willis, James Alexander, H. Torii, H. W. Van Hecke, C. R. Cleven, C. Haegemann, Y. Inoue, J. Kubart, R. Soltz, Y. Tanaka, R. Averbeck, M. Inaba, C. Zhang, Byung-Sik Hong, A. Bazilevsky, T. K. Shea, P. J. Kroon, D. Mukhopadhyay, S. Rembeczki, Dong-Hun Kim, D. Bucher, A. Khanzadeev, Alexandre Lebedev, D. Sharma, D. M. Lee, L. Baksay, V-N. Tram, M. Germain, Viktor Riabov, B. Azmoun, A. Král, M. J. Kweon, Y. Le Bornec, M. Oka, A. Dion, Atsushi Taketani, A. Enokizono, T. L. Thomas, Ryugo S. Hayano, J. Gosset, J. P. Sullivan, Y. Riabov, S. Yokkaichi, J. M. Heuser, M. Nguyen, H. Delagrange, J. G. Boissevain, Masashi Kaneta, A. S. Nyanin, C. Pinkenburg, M. Stepanov, G. Roche, S. Kametani, J. S. Haggerty, A. Romana, Y. S. Lai, M. Ouchida, J. Asai, Shingo Sakai, C. L. Woody, Minghui Liu, T. Sugitate, Kenneth Francis Read, I. V. Sourikova, Tadaaki Isobe, J. S. Chai, H. Hamagaki, P. L. McGaughey, A. V. Kazantsev, L. Tomášek, P. Mikeš, T. Liška, Jun Kikuchi, L. Aphecetche, M. Issah, M. D. Malik, E. Vznuzdaev, A. Hadj Henni, K. Boyle, Wei Xie, X. He, and O. O. Omiwade
Subjects: Physics, Quantum chromodynamics, Antiparticle, 010308 nuclear & particles physics, Hadron, General Physics and Astronomy, Elementary particle, 01 natural sciences, 7. Clean energy, Nuclear physics, Internal conversion, Pair production, Antimatter, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Lepton
Abstract: The production of e(+)e(-) pairs for m(e+e-) < 0.3 GeV/c(2) and 1< p(T) < 5 GeV/c is measured in p + p and Au + Au collisions at root s(NN) = 200 GeV. An enhanced yield above hadronic sources is observed. Treating the excess as photon internal conversions, the invariant yield of direct photons is deduced. In central Au + Au collisions, the excess of the direct photon yield over p + p is exponential in transverse momentum, with an inverse slope T = 221 +/- 19(stat) +/- 19(syst) MeV. Hydrodynamical models with initial temperatures ranging from T-init similar to 300-600 MeV at times of similar to 0.6-0.15 fm/c after the collision are in qualitative agreement with the data. Lattice QCD predicts a phase transition to quark gluon plasma at similar to 170 MeV.
Published: 2010

48. Detailed measurement of thee+e−pair continuum inp+pandAu+Aucollisions atsNN=200GeV and implications for direct photon production

Author: Tae-Yeon Lee, Martin Purschke, F. Gastineau, Tadaaki Isobe, J. S. Chai, C. Silvestre, Anne Marie Sickles, Y. Fukao, A. Shevel, P. L. McGaughey, Marisilvia Donadelli, V. Bumazhnov, M. P. Comets, O. Dietzsch, E. T. Atomssa, H. Valle, Julia Velkovska, T. Hester, D. Kotchetkov, A. Kiss, Andry Malala Rakotozafindrabe, G. R. Young, Z. Yasin, Henner Buesching, D. Kawall, K. Tanida, G. S. Kyle, N. Willis, James Alexander, A. Morreale, M. Rosati, A. A. Vinogradov, Henrik Tydesjö, R. Vértesi, Jiangyong Jia, Y. Goto, T. Ichihara, M. Ouchida, R. Averbeck, J. Chiba, Z. Fraenkel, Byung-Sik Hong, J. Asai, Matthew G. Reuter, Takahiro Fusayasu, Marcus Hohlmann, Jan Rak, I. D. Ojha, Alexander Malakhov, P. Tarján, A. Bazilevsky, G. C. Mishra, X. He, Philippe Rosnet, I. Ravinovich, V-N. Tram, Charles Maguire, S. Leckey, J. Gosset, J. M. Burward-Hoy, S. Kelly, J. P. Sullivan, Minghui Liu, R. Lacey, D. Silvermyr, V. I. Kochetkov, Shingo Sakai, R. Granier de Cassagnac, Takao Sakaguchi, Alexandre Lebedev, K. O. Eyser, K. Fujiwara, O. O. Omiwade, C. Klein-Boesing, C. L. Woody, S. Belikov, K. S. Joo, C. P. Singh, R. Pak, A. Adare, Josh Moss, Y. Nagata, L. S. Zolin, N. Kamihara, D. M. Lee, Kenneth Francis Read, A. D. Frawley, B. M. Johnson, V. Peresedov, W. J. Park, T. Tabaru, Y. Nakamiya, E. Kistenev, Motoi Inaba, K. Hasuko, N. N. Ajitanand, J. Murata, R. Armendariz, A. Isupov, C. Suire, W. C. Smith, Rushan Han, M. N. Hagiwara, S. H. Aronson, Kazuyoshi Kurita, P. D. Barnes, A. Yanovich, Hiroyuki Okada, S. S. Ryu, A. V. Kazantsev, I. V. Sourikova, T. L. Thomas, J. Sziklai, M. K. Lee, S. Yokkaichi, G. Baksay, A. Drees, Brian Cole, N. Grau, H. Harada, Alexei Khanzadeev, W. Holzmann, J. M. Heuser, Joakim Nystrand, Eva Haslum, B. Lenzi, J. Kubart, Senta Greene, R. S. Towell, M. T. Bjorndal, Ryugo S. Hayano, S. Butsyk, Y. L. Yamaguchi, Gerd Joachim Kunde, H. W. Van Hecke, Y. Riabov, I. Shein, I. Garishvili, Akio Kiyomichi, L. Aphecetche, D. Sharma, M. B. Deaton, E. Stenlund, Takahiro Nakamura, H. Masui, A. K. Dubey, A. A. Bickley, Vladimir Samsonov, I. Otterlund, Maya Hachiya Shimomura, Mate Csanad, M. Gonin, Kenta Shigaki, S. N. White, H. Sakata, Y. I. Makdisi, P. Mikeš, B. Komkov, M. Nguyen, K. S. Sim, B. Azmoun, K. Shoji, B. Love, B. E. Norman, A. Král, M. J. Kweon, J. G. Boissevain, S. Afanasiev, A. S. Nyanin, N. Kurihara, Rachid Nouicer, Norio Saito, Y. Tanaka, Y. Kwon, M. A. L. Leite, K. Das, A. Ster, H. Hiejima, L. Tomášek, C. A. Ogilvie, Marie Germain, V. S. Pantuev, E. O'Brien, Masashi Kaneta, R. A. Soltz, Y. Le Bornec, J. Newby, Tamas Ferenc Csorgo, T. K. Shea, S. Bathe, E. P. Hartouni, Agneta Oskarsson, P. W. Stankus, T. K. Hemmick, A. G. Litvinenko, M. Harvey, Yasuo Miake, M. G. Hur, C. Y. Chi, Susumu Oda, J. L. Nagle, M. Oka, K. Imai, Alberto Baldisseri, A. Deshpande, Y. Berdnikov, M. Grosse Perdekamp, Y. Akiba, Junji Tojo, M. J. Tannenbaum, T. C. Awes, Kyoichiro Ozawa, T. Liška, Jun Kikuchi, M. Mishra, C. Pinkenburg, F. Matathias, S. Nagamiya, T. Shohjoh, R. Bennett, Kazuhiro Tanaka, Kensuke Homma, A. Dion, F. Staley, L. Baksay, V. Babintsev, L. Kochenda, T. V. Moukhanova, D. Hornback, A. Kozlov, Johannes Peter Wessels, Ahmed Al-Jamel, A. Durum, Vaclav Vrba, Klaus Johannes Reygers, R. Seto, K. Haruna, D. Mukhopadhyay, E. H. Kim, S. Rembeczki, Saskia Mioduszewski, M. Heffner, Atsushi Taketani, T. Kawagishi, A. Enokizono, K. Okada, H. Pereira, B. Sahlmueller, S. Chernichenko, M. Stepanov, G. Roche, E. J. Desmond, M. Finger, Y. J. Mao, S. Kametani, K. Nakano, H. Lim, A. Taranenko, H. En'yo, David D'Enterria, A. Hadj Henni, V. Dzhordzhadze, J. Egdemir, P. Constantin, D. Bucher, M. J. Leitch, B. Bassalleck, M. Togawa, S. Takagi, J. H. Kang, J. S. Haggerty, D. S. Brown, Kazushi Miki, Y. Watanabe, Jason Kamin, J. Jin, J. Park, E. M. Takagui, S. P. Stoll, Xiao-yan Li, J. E. Frantz, M. Konno, D. Winter, D. Yu Peressounko, Florian Bauer, K. Boyle, K. N. Barish, A. Romana, W. E. Sondheim, S. S.E. Rosendahl, G. Bunce, I. Younus, Wei Xie, J. T. Mitchell, C. R. Cleven, R. P. Pisani, Y. Tsuchimoto, A. Churyn, R. Seidl, I. E. Yushmanov, Herve Borel, D. Lynch, Vladislav Manko, A. Soldatov, C. Haegemann, Y. Inoue, M. Slunečka, D. Jouan, M. L. Brooks, Y. S. Lai, A. Glenn, P. A. Rukoyatkin, V. L. Rykov, T. Dahms, M. Naglis, D. E. Fields, C. L. Silva, Nikolay Tyurin, P. J. Kroon, B. V. Jacak, M. N. Wagner, C. Vale, B. S. Chang, Dong-Hun Kim, Christine Angela Aidala, S. Y. Fung, Masayasu Ishihara, J. Klay, J. L. Drachenberg, M. Issah, Susumu Sato, M. D. Malik, E. Vznuzdaev, O. Zaudtke, M. Virius, M. McCumber, A. K. Purwar, S. P. Sorensen, Steven E. Skutnik, Y. Cobigo, John Hill, Dylan Walker, H. A. Torii, H. Qu, Toru Sugitate, S. Esumi, W. A. Zajc, Hideki Hamagaki, K. Aoki, L. D. Isenhower, V. Baublis, J. G. Lajoie, A. Denisov, T. Hachiya, G. David, I. J. Choi, A. Kravitz, Hiroaki Ohnishi, V. Cianciolo, Sergey Fokin, T. Horaguchi, S. Batsouli, M. C. McCain, A. P.T. Palounek, Xingguo Li, François Fleuret, B. Forestier, H. A. Gustafsson, C. Zhang, Viktor Riabov, I. Tserruya, Yu. Efremenko, V. Singh, Hirohiko Sato, S. K. Tuli, Alexander Milov, I. Nakagawa, O. Drapier, Frank Ellinghaus, E. R. Kinney, D. P. Morrison, S. Campbell, V. E. Semenov, J. Zimányi, Tatsuya Chujo, K. Dehmelt, Jen-Chieh Peng, Xiong Wang, Dong Jo Kim, Osamu Jinnouchi, S. F. Pate, H. Al-Bataineh, H. Kanou, V. Papavassiliou, Taku Gunji, H. Gong, J. Seele, Sébastien Gadrat, Robert F. Hobbs, F. Kajihara, H. Delagrange, Debashish Pal, S. Sawada, J. Ying, A. Franz, B. Espagnon, M. Mitrovski, S. Zhou, M. Wysocki, Y. S. Kim, M. Chiu, T. A. Shibata, D. Isenhower, A. Toia, L. Mašek, J. L. Charvet, T. E. Miller, P. Chung, M. Holmes, W. S. Emam, and H. Pei
Subjects: Physics, Nuclear and High Energy Physics, Antiparticle, Meson, 010308 nuclear & particles physics, Hadron, Elementary particle, Quarkonium, 01 natural sciences, Nuclear physics, Antimatter, 0103 physical sciences, Mass spectrum, High Energy Physics::Experiment, Atomic physics, Nuclear Experiment, 010306 general physics, Lepton
Abstract: PHENIX has measured the e(+)e(-) pair continuum in root s(NN) = 200 GeV Au+Au and p+p collisions over a wide range of mass and transverse momenta. The e(+)e(-) yield is compared to the expectations from hadronic sources, based on PHENIX measurements. In the intermediate-mass region, between the masses of the phi and the J/psi meson, the yield is consistent with expectations from correlated c (c) over bar production, although other mechanisms are not ruled out. In the low-mass region, below the phi, the p+p inclusive mass spectrum is well described by known contributions from light meson decays. In contrast, the Au+Au minimum bias inclusive mass spectrum in this region shows an enhancement by a factor of 4.7 +/- 0.4(stat) +/- 1.5(syst) +/- 0.9(model). At low mass (m(ee) < 0.3 GeV/c(2)) and high p(T) (1 < p(T) < 5 GeV/c) an enhanced e(+)e(-) pair yield is observed that is consistent with production of virtual direct photons. This excess is used to infer the yield of real direct photons. In central Au+Au collisions, the excess of the direct photon yield over the p+p is exponential in p(T), with inverse slope T = 221 +/- 19(stat) +/- 19(syst) MeV. Hydrodynamical models with initial temperatures ranging from T-init similar or equal to 300-600 MeV at times of 0.6-0.15 fm/c after the collision are in qualitative agreement with the direct photon data in Au+Au. For low p(T) < 1 GeV/c the low-mass region shows a further significant enhancement that increases with centrality and has an inverse slope of T similar or equal to 100 MeV. Theoretical models underpredict the low-mass, low-p(T) enhancement.
Published: 2010

49. Double-helicity dependence of jet properties from dihadrons in longitudinally polarizedp+pcollisions ats=200 GeV

Author: J. Chiba, Y. Ikeda, J. G. Boissevain, E. J. Mannel, Masashi Kaneta, David D'Enterria, Takao Sakaguchi, C. Klein-Boesing, B. Azmoun, M. B. Deaton, A. Král, M. J. Kweon, C. Pinkenburg, A. D. Frawley, T. Tabaru, A. Kiss, I. Tserruya, Tadaaki Isobe, D. E. Fields, Y. Onuki, Y. Tanaka, Yu. Efremenko, S. Huang, Jan Rak, M. Stepanov, R. Lacey, G. Roche, S. P. Sorensen, Robert F. Hobbs, V. Singh, R. Granier de Cassagnac, S. H. Aronson, A. Adare, M. N. Wagner, Z. Yasin, P. L. McGaughey, B. V. Jacak, W. Holzmann, M. Oka, Dylan Walker, M. Chiu, Henner Buesching, K. A. Drees, Y. J. Mao, A. Dion, K. S. Sim, Y. Nakamiya, V. Dzhordzhadze, S. Kametani, T. Horaguchi, Y. Kwon, R. Yang, H. Hiejima, M. McCumber, Anne Marie Sickles, K. Imai, Seong H. Kim, M. Ouchida, N. Means, J. Asai, Debashish Pal, S. Sawada, J. H. Kang, J. S. Haggerty, G. R. Young, Marcus Hohlmann, F. Staley, L. Baksay, J. G. Lajoie, G. Baksay, A. Romana, Atsushi Taketani, A. Enokizono, P. Liebing, T. Hachiya, J. Ying, A. Franz, A. V. Kazantsev, C. R. Cleven, Ajit Kumar Mohanty, C. Haegemann, Y. Inoue, T. A. Shibata, Alexander Milov, I. Nakagawa, Maya Hachiya Shimomura, Y. I. Makdisi, Shingo Sakai, T. Engelmore, T. Sato, R. A. Soltz, Y. Fukao, Tae-Yeon Lee, A. Shevel, Martin Purschke, C. M. Camacho, Prashant Shukla, L. Tomášek, P. Mikeš, R. Pak, W. A. Zajc, C. Silvestre, T. Hester, T. Kempel, Dong-Hun Kim, O. Drapier, Frank Ellinghaus, E. R. Kinney, I. J. Choi, D. P. Morrison, S. Campbell, A. Kravitz, H. Pei, S. F. Pate, R. Vértesi, N. Kamihara, Marisilvia Donadelli, D. Isenhower, A. Toia, V. E. Semenov, D. Kotchetkov, J. Zimányi, V. Baublis, R. Armendariz, O. Dietzsch, A. Denisov, E. T. Atomssa, H. Valle, Y. S. Lai, V. Bumazhnov, M. P. Comets, Tatsuya Chujo, V. Cianciolo, M. J. Tannenbaum, T. C. Awes, Kyoichiro Ozawa, T. Liška, X. He, O. O. Omiwade, H. Al-Bataineh, Hiroaki Ohnishi, K. B. Lee, A. Yu. Semenov, L. Mašek, A. Morreale, M. Grosse Perdekamp, Andry Malala Rakotozafindrabe, L. Aphecetche, K. O. Eyser, A. K. Purwar, K. Fujiwara, H. Torii, C. L. Woody, A. Berdnikov, J. Gosset, J. T. Mitchell, Y. Tomita, Jun Kikuchi, Kazuyoshi Kurita, A. Drees, V-N. Tram, N. Grau, Dipanwita Dutta, N. N. Ajitanand, T. Niita, D. Mukhopadhyay, Sergey Fokin, S. Rembeczki, K. Dehmelt, R. Tanabe, D. Layton, Z. Fraenkel, Jen-Chieh Peng, R. Seidl, Vladislav Manko, K. Das, Minghui Liu, J. L. Charvet, J. Kubart, J. E. Frantz, V. Papavassiliou, K. Sakashita, Motoi Inaba, V. Peresedov, Julia Velkovska, Sébastien Gadrat, Takahiro Nakamura, M. Slunečka, H. Liu, M. K. Lee, R. K. Choudhury, Xiong Wang, Eva Haslum, Dong Jo Kim, E. P. Hartouni, B. Lenzi, Kenneth Francis Read, T. E. Miller, M. Kurosawa, J. Egdemir, W. C. Chang, Osamu Jinnouchi, Jason Kamin, E. J. Desmond, D. Roach, S. Yokkaichi, K. M. Kijima, S. Belikov, K. Shoji, M. Mitrovski, Susumu Oda, B. Meredith, H. W. Van Hecke, A. Durum, J. Koster, I. V. Sourikova, Charles Maguire, S. Afanasiev, A. Ster, T. L. Thomas, A. Veicht, S. P. Stoll, M. Rosati, Rushan Han, P. Chung, J. Imrek, M. Togawa, J. Park, V. S. Pantuev, S. Butsyk, Vladimir Samsonov, J. Newby, H. A. Gustafsson, M. Wysocki, S. Bathe, Johannes Peter Wessels, Agneta Oskarsson, Ryugo S. Hayano, S. S.E. Rosendahl, G. Bunce, K. Yamaura, E. Kistenev, Xingguo Li, M. Gonin, W. S. Emam, S. Batsouli, H. Kanou, Y. Tsuchimoto, Y. Riabov, Y. Berdnikov, Y. Akiba, P. W. Stankus, M. Mishra, D. Hornback, A. Churyn, Kenta Shigaki, H. Masui, A. K. Dubey, Taku Gunji, H. Gong, J. Seele, M. Nguyen, M. Heffner, D. Jouan, A. A. Vinogradov, C. Zhang, C. Vale, I. E. Yushmanov, Junji Tojo, F. Kajihara, S. Nagamiya, A. Hadj Henni, Alexei Khanzadeev, Tamas Ferenc Csorgo, H. Harada, J. L. Nagle, Vaclav Vrba, Klaus Johannes Reygers, A. S. Nyanin, A. Taranenko, E. Stenlund, B. S. Chang, Kazushi Miki, Rachid Nouicer, H. Delagrange, Jiangyong Jia, Y. Goto, D. Winter, H. Sakata, D. Yu Peressounko, A. A. Bickley, P. Tarján, A. Sukhanov, K. Okada, H. Pereira, Y. Morino, Christine Angela Aidala, J. Klay, Brajesh K. Singh, C. A. Ogilvie, P. Ružička, T. K. Hemmick, B. Sahlmueller, John Hill, H. En'yo, M. J. Leitch, Beomkyu Kim, K. Boyle, S. Zhou, Yasuo Miake, B. Love, Wei Xie, Steven E. Skutnik, T. V. Moukhanova, S. D. Rolnick, L. Kochenda, Viktor Riabov, A. G. Litvinenko, F. Matathias, Toru Sugitate, L. D. Isenhower, Senta Greene, M. I. Nagy, M. Issah, M. D. Malik, E. Vznuzdaev, A. Kozlov, R. Seto, K. Haruna, A. T. Basye, Kensuke Homma, B. E. Norman, B. Fadem, H. Qu, S. Takagi, E. O'Brien, K. N. Barish, P. Constantin, S. Chernichenko, Hideki Hamagaki, K. Aoki, M. L. Brooks, G. David, François Fleuret, B. Bassalleck, H. Iinuma, T. Ichihara, M. Konno, Matthew G. Reuter, Takahiro Fusayasu, A. P.T. Palounek, Alexander Malakhov, D. Silvermyr, L. S. Zolin, W. J. Park, P. D. Barnes, A. Yanovich, S. N. White, Zvi Hirsh Citron, K. Nakano, W. E. Sondheim, D. Ivanischev, P. A. Rukoyatkin, E. H. Kim, I. Ravinovich, Y. Nagata, Y. L. Yamaguchi, M. Bai, B. Komkov, E. C. Aschenauer, Norio Saito, M. A. L. Leite, R. Bennett, J. S. Kapustinsky, M. Finger, S. Dairaku, V. Babintsev, O. Zaudtke, G. S. Kyle, James Alexander, M. Virius, R. Averbeck, Byung-Sik Hong, A. Bazilevsky, Philippe Rosnet, A. Glenn, Alexandre Lebedev, D. M. Lee, Herve Borel, D. Lynch, K. Kiriluk, V. L. Rykov, T. Dahms, K. S. Joo, S. Esumi, D. Sharma, Saskia Mioduszewski, R. Ichimiya, J. Jin, E. M. Takagui, C. Baumann, M. Naglis, C. P. Singh, C. L. Silva, B. M. Johnson, A. Isupov, C. Suire, Masayasu Ishihara, J. Sziklai, Susumu Sato, Brian Cole, R. S. Towell, I. Garishvili, Akio Kiyomichi, F. Wei, A. Deshpande, N. Kurihara, C. Y. Chi, Y. Watanabe, I. Younus, A. Soldatov, D. Kawall, K. Tanida, H. Themann, V. I. Kochetkov, J. Murata, Gerd Joachim Kunde, I. Shein, K. Sedgwick, Alberto Baldisseri, and Mate Csanad
Subjects: Physics, Nuclear and High Energy Physics, Angular momentum, Particle physics, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Drell–Yan process, 01 natural sciences, Helicity, Baryon, Nuclear physics, Total angular momentum quantum number, 0103 physical sciences, Proton spin crisis, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Nucleon, Spin (physics)
Abstract: It has been postulated that partonic orbital angular momentum can lead to a significant double-helicity dependence in the net transverse momentum of Drell-Yan dileptons produced in longitudinally polarized p + p collisions. Analogous effects are also expected for dijet production. If confirmed by experiment, this hypothesis, which is based on semiclassical arguments, could lead to a new approach for studying the contributions of orbital angular momentum to the proton spin. We report the first measurement of the double-helicity dependence of the dijet transverse momentum in longitudinally polarized p + p collisions at root s = 200 GeV from data taken by the PHENIX experiment in 2005 and 2006. The analysis deduces the transverse momentum of the dijet from the widths of the near-and far-side peaks in the azimuthal correlation of the dihadrons. When averaged over the transverse momentum of the triggered particle, the difference of the root mean square of the dijet transverse momentum between like-and unlike-helicity collisions is found to be -37 +/- 88(stat) +/- 14(sys)t MeV/c.
Published: 2010

50. High-pT π0production with respect to the reaction plane inAu+Aucollisions atsNN=200GeV

Author: Youngil Kwon, J. Egdemir, Taku Gunji, F. Kajihara, Tadaaki Isobe, J. S. Chai, S. P. Stoll, H. Delagrange, E. J. Desmond, K. Hasuko, S. S.E. Rosendahl, D. E. Fields, G. Bunce, K. Das, P. L. McGaughey, Hiroyuki Okada, E. P. Hartouni, B. V. Jacak, Y. S. Kim, Joakim Nystrand, M. Togawa, Eva Haslum, J. Park, Florian Bauer, C. A. Ogilvie, T. K. Hemmick, Yasuo Miake, L. Kochenda, A. K. Purwar, D. Jouan, T. Kawagishi, G. S. Kyle, A. V. Kazantsev, M. Chiu, T. A. Shibata, N. Willis, James Alexander, C. R. Cleven, R. Averbeck, Byung-Sik Hong, T. Ichihara, Matthew G. Reuter, N. Kamihara, S. Butsyk, Vladimir Samsonov, A. Bazilevsky, S. Afanasiev, F. Matathias, A. Ster, R. Armendariz, S. Takagi, Kazuyoshi Kurita, A. Drees, Philippe Rosnet, I. D. Ojha, D. Isenhower, Alexander Malakhov, P. J. Kroon, J. Newby, V-N. Tram, Alexandre Lebedev, V. S. Pantuev, L. Aphecetche, K. N. Barish, P. Tarján, T. L. Thomas, D. Silvermyr, M. Gonin, L. S. Zolin, Y. Tsuchimoto, S. Kelly, D. M. Lee, Yoichiro Fukao, N. N. Ajitanand, S. Kametani, W. J. Park, Kensuke Homma, M. Rosati, M. Heffner, Ryugo S. Hayano, Tamas Ferenc Csorgo, M. Harvey, T. C. Awes, Kyoichiro Ozawa, Junji Tojo, Motoi Inaba, S. Esumi, J. L. Nagle, Takahiro Nakamura, J. H. Kang, T. E. Miller, A. Taranenko, A. Enokizono, Jen-Chieh Peng, P. D. Barnes, A. Yanovich, N. Grau, K. Shoji, E. H. Kim, Y. Riabov, Kenta Shigaki, I. E. Yushmanov, Maya Hachiya Shimomura, Johannes Peter Wessels, J. S. Haggerty, A. Romana, W. A. Zajc, M. Wysocki, M. Holmes, T. Shohjoh, A. Durum, H. Pereira, S. Y. Fung, M. Nguyen, R. Vértesi, M. L. Brooks, A. S. Nyanin, K. Okada, K. S. Sim, Y. Watanabe, A. Hadj Henni, S. Chernichenko, H. Lim, V. Baublis, John Hill, P. W. Stankus, H. W. Van Hecke, A. Denisov, V. Cianciolo, J. E. Frantz, B. Bassalleck, A. A. Vinogradov, Henrik Tydesjö, D. S. Brown, Minghui Liu, Robert F. Hobbs, B. Sahlmueller, Y. I. Makdisi, Dong Jo Kim, V. Bumazhnov, M. P. Comets, K. Boyle, Sergey Fokin, Anders Nils Erik Oskarsson, H. En'yo, P. Constantin, M. Konno, H. A. Torii, Osamu Jinnouchi, Wei Xie, Marie Germain, Jiangyong Jia, Y. Goto, M. J. Leitch, Toru Sugitate, A. Kiss, Kenneth Francis Read, L. D. Isenhower, T. Horaguchi, Henner Buesching, Senta Greene, A. G. Litvinenko, J. L. Drachenberg, H. Hiejima, B. Komkov, Steven E. Skutnik, Hans-Åke Gustafsson, Martin Purschke, J. M. Burward-Hoy, Debashish Pal, J. Gosset, B. E. Norman, Norio Saito, J. P. Sullivan, S. Sawada, E. O'Brien, Alexander Milov, M. A. L. Leite, A. Franz, R. A. Soltz, A. Kozlov, F. Gastineau, Shingo Sakai, K. Imai, H. Qu, M. N. Hagiwara, Herve Borel, R. Seto, K. Haruna, W. C. Smith, S. Bathe, C. L. Woody, S. P. Sorensen, François Fleuret, M. Issah, O. Drapier, Hideki Hamagaki, K. Aoki, G. David, M. Grosse Perdekamp, M. J. Tannenbaum, B. Forestier, Y. Berdnikov, V. Babintsev, M. D. Malik, B. Espagnon, Y. Akiba, S. Yokkaichi, V. Dzhordzhadze, M. T. Bjorndal, A. Glenn, J. M. Heuser, S. Nagamiya, Kazuhiro Tanaka, E. Vznuzdaev, X. He, E. R. Kinney, Klaus Johannes Reygers, D. P. Morrison, O. O. Omiwade, M. K. Lee, Anne Marie Sickles, S. N. White, S. Campbell, S. F. Pate, O. Dietzsch, V. Peresedov, J. G. Boissevain, Masashi Kaneta, V. L. Rykov, T. Dahms, I. V. Sourikova, H. Valle, C. Zhang, V. E. Semenov, D. Winter, D. Yu Peressounko, Alexei Khanzadeev, Julia Velkovska, X. R. Wang, D. Mukhopadhyay, G. R. Young, J. Zimányi, C. Pinkenburg, J. T. Mitchell, H. Masui, A. K. Dubey, J. G. Lajoie, W. E. Sondheim, D. Kotchetkov, Tatsuya Chujo, T. Hachiya, O. Zaudtke, D. Bucher, P. A. Rukoyatkin, E. Stenlund, Vladislav Manko, I. Tserruya, M. Stepanov, G. Roche, Yu. Efremenko, Jan Rak, R. Lacey, Ingvar Otterlund, R. Granier de Cassagnac, J. Chiba, V. Papavassiliou, Sébastien Gadrat, V. Singh, I. J. Choi, Hiroaki Ohnishi, C. Vale, Viktor Riabov, Christine Angela Aidala, G. C. Mishra, Z. Fraenkel, Takao Sakaguchi, C. Klein-Boesing, Y. Cobigo, I. Ravinovich, A. D. Frawley, T. Tabaru, Y. Nagata, S. Batsouli, S. H. Aronson, W. Holzmann, S. S. Ryu, T. V. Moukhanova, R. Bennett, Hirohiko Sato, S. K. Tuli, Ahmed Al-Jamel, Xingguo Li, B. Azmoun, M. J. Kweon, M. C. McCain, A. P.T. Palounek, Y. Le Bornec, A. Dion, Atsushi Taketani, S. Belikov, K. S. Joo, H. Pei, D. Sharma, Mate Csanad, David D'Enterria, R. P. Pisani, Nikolay Tyurin, M. N. Wagner, Saskia Mioduszewski, J. Jin, E. M. Takagui, C. P. Singh, B. M. Johnson, A. Isupov, C. Suire, J. Sziklai, Brian Cole, Charles Maguire, S. Leckey, R. S. Towell, Josh Moss, Akio Kiyomichi, E. Kistenev, H. Harada, N. Kurihara, M. G. Hur, C. Y. Chi, Y. Tanaka, T. K. Shea, M. Naglis, C. L. Silva, Masayasu Ishihara, F. Staley, Susumu Sato, A. Deshpande, I. Younus, A. Soldatov, K. Tanida, V. I. Kochetkov, J. Murata, Gerd Joachim Kunde, I. Shein, and Alberto Baldisseri
Subjects: Physics, Nuclear and High Energy Physics, Meson, 010308 nuclear & particles physics, Plane (geometry), Elliptic flow, Parton, 01 natural sciences, Azimuth, Nuclear physics, Pion, 0103 physical sciences, Atomic physics, Nuclear Experiment, 010306 general physics, Relativistic Heavy Ion Collider, Jet quenching
Abstract: Measurements of the azimuthal anisotropy of high-p(T) neutral pion (pi(0)) production in Au+Au collisions at s(NN)=200 GeV by the PHENIX experiment are presented. The data included in this article were collected during the 2004 Relativistic Heavy Ion Collider running period and represent approximately an order of magnitude increase in the number of analyzed events relative to previously published results. Azimuthal angle distributions of pi(0) mesons detected in the PHENIX electromagnetic calorimeters are measured relative to the reaction plane determined event-by-event using the forward and backward beam-beam counters. Amplitudes of the second Fourier component (v(2)) of the angular distributions are presented as a function of pi(0) transverse momentum (p(T)) for different bins in collision centrality. Measured reaction plane dependent pi(0) yields are used to determine the azimuthal dependence of the pi(0) suppression as a function of p(T), R-AA(Delta phi,p(T)). A jet-quenching motivated geometric analysis is presented that attempts to simultaneously describe the centrality dependence and reaction plane angle dependence of the pi(0) suppression in terms of the path lengths of hypothetical parent partons in the medium. This set of results allows for a detailed examination of the influence of geometry in the collision region and of the interplay between collective flow and jet-quenching effects along the azimuthal axis.
Published: 2009

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