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1. Variation in global chemical composition of PM2.5: emerging results from SPARTAN

Author

G. Snider, C. L. Weagle, K. K. Murdymootoo, A. Ring, Y. Ritchie, E. Stone, A. Walsh, C. Akoshile, N. X. Anh, R. Balasubramanian, J. Brook, F. D. Qonitan, J. Dong, D. Griffith, K. He, B. N. Holben, R. Kahn, N. Lagrosas, P. Lestari, Z. Ma, A. Misra, L. K. Norford, E. J. Quel, A. Salam, B. Schichtel, L. Segev, S. Tripathi, C. Wang, C. Yu, Q. Zhang, Y. Zhang, M. Brauer, A. Cohen, M. D. Gibson, Y. Liu, J. V. Martins, Y. Rudich, and R. V. Martin

Subjects
Physics, QC1-999, Chemistry, QD1-999
Abstract

The Surface PARTiculate mAtter Network (SPARTAN) is a long-term project that includes characterization of chemical and physical attributes of aerosols from filter samples collected worldwide. This paper discusses the ongoing efforts of SPARTAN to define and quantify major ions and trace metals found in fine particulate matter (PM2.5). Our methods infer the spatial and temporal variability of PM2.5 in a cost-effective manner. Gravimetrically weighed filters represent multi-day averages of PM2.5, with a collocated nephelometer sampling air continuously. SPARTAN instruments are paired with AErosol RObotic NETwork (AERONET) sun photometers to better understand the relationship between ground-level PM2.5 and columnar aerosol optical depth (AOD).We have examined the chemical composition of PM2.5 at 12 globally dispersed, densely populated urban locations and a site at Mammoth Cave (US) National Park used as a background comparison. So far, each SPARTAN location has been active between the years 2013 and 2016 over periods of 2–26 months, with an average period of 12 months per site. These sites have collectively gathered over 10 years of quality aerosol data. The major PM2.5 constituents across all sites (relative contribution ± SD) are ammoniated sulfate (20 % ± 11 %), crustal material (13.4 % ± 9.9 %), equivalent black carbon (11.9 % ± 8.4 %), ammonium nitrate (4.7 % ± 3.0 %), sea salt (2.3 % ± 1.6 %), trace element oxides (1.0 % ± 1.1 %), water (7.2 % ± 3.3 %) at 35 % RH, and residual matter (40 % ± 24 %).Analysis of filter samples reveals that several PM2.5 chemical components varied by more than an order of magnitude between sites. Ammoniated sulfate ranges from 1.1 µg m−3 (Buenos Aires, Argentina) to 17 µg m−3 (Kanpur, India in the dry season). Ammonium nitrate ranged from 0.2 µg m−3 (Mammoth Cave, in summer) to 6.8 µg m−3 (Kanpur, dry season). Equivalent black carbon ranged from 0.7 µg m−3 (Mammoth Cave) to over 8 µg m−3 (Dhaka, Bangladesh and Kanpur, India). Comparison of SPARTAN vs. coincident measurements from the Interagency Monitoring of Protected Visual Environments (IMPROVE) network at Mammoth Cave yielded a high degree of consistency for daily PM2.5 (r2 = 0.76, slope = 1.12), daily sulfate (r2 = 0.86, slope = 1.03), and mean fractions of all major PM2.5 components (within 6 %). Major ions generally agree well with previous studies at the same urban locations (e.g. sulfate fractions agree within 4 % for 8 out of 11 collocation comparisons). Enhanced anthropogenic dust fractions in large urban areas (e.g. Singapore, Kanpur, Hanoi, and Dhaka) are apparent from high Zn : Al ratios.The expected water contribution to aerosols is calculated via the hygroscopicity parameter κv for each filter. Mean aggregate values ranged from 0.15 (Ilorin) to 0.28 (Rehovot). The all-site parameter mean is 0.20 ± 0.04. Chemical composition and water retention in each filter measurement allows inference of hourly PM2.5 at 35 % relative humidity by merging with nephelometer measurements. These hourly PM2.5 estimates compare favourably with a beta attenuation monitor (MetOne) at the nearby US embassy in Beijing, with a coefficient of variation r2 = 0.67 (n = 3167), compared to r2 = 0.62 when κv was not considered. SPARTAN continues to provide an open-access database of PM2.5 compositional filter information and hourly mass collected from a global federation of instruments.

Published
2016
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2. SPARTAN: a global network to evaluate and enhance satellite-based estimates of ground-level particulate matter for global health applications

Author

G. Snider, C. L. Weagle, R. V. Martin, A. van Donkelaar, K. Conrad, D. Cunningham, C. Gordon, M. Zwicker, C. Akoshile, P. Artaxo, N. X. Anh, J. Brook, J. Dong, R. M. Garland, R. Greenwald, D. Griffith, K. He, B. N. Holben, R. Kahn, I. Koren, N. Lagrosas, P. Lestari, Z. Ma, J. Vanderlei Martins, E. J. Quel, Y. Rudich, A. Salam, S. N. Tripathi, C. Yu, Q. Zhang, Y. Zhang, M. Brauer, A. Cohen, M. D. Gibson, and Y. Liu

Subjects
Environmental engineering, TA170-171, Earthwork. Foundations, TA715-787
Abstract

Ground-based observations have insufficient spatial coverage to assess long-term human exposure to fine particulate matter (PM2.5) at the global scale. Satellite remote sensing offers a promising approach to provide information on both short- and long-term exposure to PM2.5 at local-to-global scales, but there are limitations and outstanding questions about the accuracy and precision with which ground-level aerosol mass concentrations can be inferred from satellite remote sensing alone. A key source of uncertainty is the global distribution of the relationship between annual average PM2.5 and discontinuous satellite observations of columnar aerosol optical depth (AOD). We have initiated a global network of ground-level monitoring stations designed to evaluate and enhance satellite remote sensing estimates for application in health-effects research and risk assessment. This Surface PARTiculate mAtter Network (SPARTAN) includes a global federation of ground-level monitors of hourly PM2.5 situated primarily in highly populated regions and collocated with existing ground-based sun photometers that measure AOD. The instruments, a three-wavelength nephelometer and impaction filter sampler for both PM2.5 and PM10, are highly autonomous. Hourly PM2.5 concentrations are inferred from the combination of weighed filters and nephelometer data. Data from existing networks were used to develop and evaluate network sampling characteristics. SPARTAN filters are analyzed for mass, black carbon, water-soluble ions, and metals. These measurements provide, in a variety of regions around the world, the key data required to evaluate and enhance satellite-based PM2.5 estimates used for assessing the health effects of aerosols. Mean PM2.5 concentrations across sites vary by more than 1 order of magnitude. Our initial measurements indicate that the ratio of AOD to ground-level PM2.5 is driven temporally and spatially by the vertical profile in aerosol scattering. Spatially this ratio is also strongly influenced by the mass scattering efficiency.

Published
2015
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3. A comparison of four receptor models used to quantify the boreal wildfire smoke contribution to surface PM2.5 in Halifax, Nova Scotia during the BORTAS-B experiment

Author

M. D. Gibson, J. Haelssig, J. R. Pierce, M. Parrington, J. E. Franklin, J. T. Hopper, Z. Li, and T. J. Ward

Subjects
Physics, QC1-999, Chemistry, QD1-999
Abstract

This paper presents a quantitative comparison of the four most commonly used receptor models, namely absolute principal component scores (APCS), pragmatic mass closure (PMC), chemical mass balance (CMB) and positive matrix factorization (PMF). The models were used to predict the contributions of a wide variety of sources to PM2.5 mass in Halifax, Nova Scotia during the experiment to quantify the impact of BOReal forest fires on Tropospheric oxidants over the Atlantic using Aircraft and Satellites (BORTAS). However, particular emphasis was placed on the capacity of the models to predict the boreal wildfire smoke contributions during the BORTAS experiment. The performance of the four receptor models was assessed on their ability to predict the observed PM2.5 with an R2 close to 1, an intercept close to zero, a low bias and low RSME. Using PMF, a new woodsmoke enrichment factor of 52 was estimated for use in the PMC receptor model. The results indicate that the APCS and PMC receptor models were not able to accurately resolve total PM2.5 mass concentrations below 2 μg m−3. CMB was better able to resolve these low PM2.5 concentrations, but it could not be run on 9 of the 45 days of PM2.5 samples. PMF was found to be the most robust of the four models since it was able to resolve PM2.5 mass below 2 μg m−3, predict PM2.5 mass on all 45 days and utilise an unambiguous woodsmoke chemical tracer. The median woodsmoke relative contributions to PM2.5 estimated using PMC, APCS, CMB and PMF were found to be 0.08, 0.09, 3.59 and 0.14 μg m−3 respectively. The contribution predicted by the CMB model seemed to be clearly too high based on other observations. The use of levoglucosan as a tracer for woodsmoke was found to be vital for identifying this source.

Published
2015
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4. A case study of aerosol scavenging in a biomass burning plume over eastern Canada during the 2011 BORTAS field experiment

Author

J. E. Franklin, J. R. Drummond, D. Griffin, J. R. Pierce, D. L. Waugh, P. I. Palmer, M. Parrington, J. D. Lee, A. C. Lewis, A. R. Rickard, J. W. Taylor, J. D. Allan, H. Coe, K. A. Walker, L. Chisholm, T. J. Duck, J. T. Hopper, Y. Blanchard, M. D. Gibson, K. R. Curry, K. M. Sakamoto, G. Lesins, L. Dan, J. Kliever, and A. Saha

Subjects
Physics, QC1-999, Chemistry, QD1-999
Abstract

We present measurements of a long-range smoke transport event recorded on 20–21 July 2011 over Halifax, Nova Scotia, Canada, during the Quantifying the impact of BOReal forest fires on Tropospheric oxidants over the Atlantic using Aircraft and Satellites (BORTAS-B) campaign. Ground-based Fourier transform spectrometers and photometers detected air masses associated with large wildland fires burning in eastern Manitoba and western Ontario. We investigate a plume with high trace gas amounts but low amounts of particles that preceded and overlapped at the Halifax site with a second plume with high trace gas loadings and significant amounts of particulate material. We show that the first plume experienced a meteorological scavenging event, but the second plume had not been similarly scavenged. This points to the necessity to account carefully for the plume history when considering long-range transport since simultaneous or near-simultaneous times of arrival are not necessarily indicative of either similar trajectories or meteorological history. We investigate the origin of the scavenged plume, and the possibility of an aerosol wet deposition event occurring in the plume ~ 24 h prior to the measurements over Halifax. The region of lofting and scavenging is only monitored on an intermittent basis by the present observing network, and thus we must consider many different pieces of evidence in an effort to understand the early dynamics of the plume. Through this discussion we also demonstrate the value of having many simultaneous remote-sensing measurements in order to understand the physical and chemical behaviour of biomass burning plumes.

Published
2014
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5. Identifying the sources driving observed PM2.5 temporal variability over Halifax, Nova Scotia, during BORTAS-B

Author

M. D. Gibson, J. R. Pierce, D. Waugh, J. S. Kuchta, L. Chisholm, T. J. Duck, J. T. Hopper, S. Beauchamp, G. H. King, J. E. Franklin, W. R. Leaitch, A. J. Wheeler, Z. Li, G. A. Gagnon, and P. I. Palmer

Subjects
Physics, QC1-999, Chemistry, QD1-999
Abstract

The source attribution of observed variability of total PM2.5 concentrations over Halifax, Nova Scotia, was investigated between 11 July and 26 August 2011 using measurements of PM2.5 mass and PM2.5 chemical composition (black carbon, organic matter, anions, cations and 33 elements). This was part of the BORTAS-B (quantifying the impact of BOReal forest fires on Tropospheric oxidants using Aircraft and Satellites) experiment, which investigated the atmospheric chemistry and transport of seasonal boreal wildfire emissions over eastern Canada in 2011. The US EPA Positive Matrix Factorization (PMF) receptor model was used to determine the average mass (percentage) source contribution over the 45 days, which was estimated to be as follows: long-range transport (LRT) pollution: 1.75 μg m−3 (47%); LRT pollution marine mixture: 1.0 μg m−3 (27.9%); vehicles: 0.49 μg m−3 (13.2%); fugitive dust: 0.23 μg m−3 (6.3%); ship emissions: 0.13 μg m−3 (3.4%); and refinery: 0.081 μg m−3 (2.2%). The PMF model describes 87% of the observed variability in total PM2.5 mass (bias = 0.17 and RSME = 1.5 μg m−3). The factor identifications are based on chemical markers, and they are supported by air mass back trajectory analysis and local wind direction. Biomass burning plumes, found by other surface and aircraft measurements, were not significant enough to be identified in this analysis. This paper presents the results of the PMF receptor modelling, providing valuable insight into the local and upwind sources impacting surface PM2.5 in Halifax and a vital comparative data set for the other collocated ground-based observations of atmospheric composition made during BORTAS-B.

Published
2013
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6. Quantifying the impact of BOReal forest fires on Tropospheric oxidants over the Atlantic using Aircraft and Satellites (BORTAS) experiment: design, execution and science overview

Author

P. I. Palmer, M. Parrington, J. D. Lee, A. C. Lewis, A. R. Rickard, P. F. Bernath, T. J. Duck, D. L. Waugh, D. W. Tarasick, S. Andrews, E. Aruffo, L. J. Bailey, E. Barrett, S. J.-B. Bauguitte, K. R. Curry, P. Di Carlo, L. Chisholm, L. Dan, G. Forster, J. E. Franklin, M. D. Gibson, D. Griffin, D. Helmig, J. R. Hopkins, J. T. Hopper, M. E. Jenkin, D. Kindred, J. Kliever, M. Le Breton, S. Matthiesen, M. Maurice, S. Moller, D. P. Moore, D. E. Oram, S. J. O'Shea, R. C. Owen, C. M. L. S. Pagniello, S. Pawson, C. J. Percival, J. R. Pierce, S. Punjabi, R. M. Purvis, J. J. Remedios, K. M. Rotermund, K. M. Sakamoto, A. M. da Silva, K. B. Strawbridge, K. Strong, J. Taylor, R. Trigwell, K. A. Tereszchuk, K. A. Walker, D. Weaver, C. Whaley, and J. C. Young

Subjects
Physics, QC1-999, Chemistry, QD1-999
Abstract

We describe the design and execution of the BORTAS (Quantifying the impact of BOReal forest fires on Tropospheric oxidants over the Atlantic using Aircraft and Satellites) experiment, which has the overarching objective of understanding the chemical aging of air masses that contain the emission products from seasonal boreal wildfires and how these air masses subsequently impact downwind atmospheric composition. The central focus of the experiment was a two-week deployment of the UK BAe-146-301 Atmospheric Research Aircraft (ARA) over eastern Canada, based out of Halifax, Nova Scotia. Atmospheric ground-based and sonde measurements over Canada and the Azores associated with the planned July 2010 deployment of the ARA, which was postponed by 12 months due to UK-based flights related to the dispersal of material emitted by the Eyjafjallajökull volcano, went ahead and constituted phase A of the experiment. Phase B of BORTAS in July 2011 involved the same atmospheric measurements, but included the ARA, special satellite observations and a more comprehensive ground-based measurement suite. The high-frequency aircraft data provided a comprehensive chemical snapshot of pyrogenic plumes from wildfires, corresponding to photochemical (and physical) ages ranging from < 1 day to ~<45 sr 10 days, largely by virtue of widespread fires over Northwestern Ontario. Airborne measurements reported a large number of emitted gases including semi-volatile species, some of which have not been been previously reported in pyrogenic plumes, with the corresponding emission ratios agreeing with previous work for common gases. Analysis of the NOy data shows evidence of net ozone production in pyrogenic plumes, controlled by aerosol abundance, which increases as a function of photochemical age. The coordinated ground-based and sonde data provided detailed but spatially limited information that put the aircraft data into context of the longer burning season in the boundary layer. Ground-based measurements of particulate matter smaller than 2.5 μm (PM2.5) over Halifax show that forest fires can on an episodic basis represent a substantial contribution to total surface PM2.5.

Published
2013
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7. A case study of aerosol depletion in a biomass burning plume over Eastern Canada during the 2011 BORTAS field experiment

Author

J. E. Franklin, J. R. Drummond, D. Griffin, J. R. Pierce, D. L. Waugh, P. I. Palmer, M. Parrington, J. D. Lee, A. C. Lewis, A. R. Rickard, J. W. Taylor, J. D. Allan, H. Coe, K. A. Walker, L. Chisholm, T. J. Duck, J. T. Hopper, Y. Blanchard, M. D. Gibson, K. R. Curry, K. M. Sakamoto, G. Lesins, L. Dan, J. Kliever, and A. Saha

Abstract

We present measurements of a long range smoke transport event recorded on 20–21 July 2011 over Halifax, Nova Scotia, Canada, during the Quantifying the impact of BOReal forest fires on Tropospheric oxidants over the Atlantic using Aircraft and Satellites (BORTAS-B) campaign. Ground-based Fourier transform spectrometers and photometers detected air masses associated with large wildland fires burning in eastern Manitoba and western Ontario. We investigate a plume with high trace gas amounts but low amounts of particles that preceded and overlapped at the Halifax site with a second plume with high trace gas loadings and significant amounts of particulate material. We show that the first plume experienced a meteorological scavenging event but the second plume had not been similarly scavenged. This points to the necessity to account carefully for the plume history when considering long range transport since simultaneous or near-simultaneous times of arrival are not necessarily indicative of either similar trajectories or meteorological history. We investigate the origin of the scavenged plume, and the possibility of an aerosol wet deposition event occurring in the plume ~24 h prior to the measurements over Halifax. The region of lofting and scavenging is only monitored on an intermittent basis by the present observing network, and thus we must consider many different pieces of evidence in an effort to understand the early dynamics of the plume. Through this discussion we also demonstrate the value of having many simultaneous remote-sensing measurements in order to understand the physical and chemical behaviour of biomass burning plumes.

Published
2014

8. Monte Carlo simulation of the solid to superliquid phase transition of Langmuir monolayers. II. Characteristics of phase transition

Author

David Swanson, M. D. Gibson, Craig J. Eckhardt, and Xiao Cheng Zeng

Subjects
Phase transition, Langmuir, Planar, Volume (thermodynamics), Condensed matter physics, Chemistry, Monte Carlo method, Monolayer, General Physics and Astronomy, Physical and Theoretical Chemistry, Maxima, Molecular physics, Symmetry (physics)
Abstract

The restricted-to-free rotator phase transition of fatty acid monolayers has been modeled using a potential which represents the amphiphiles as planar cross sections of fourfold symmetry. Using much larger system sizes than paper I [D. R. Swanson, R. J. Hardy, and C. J. Eckhardt, J. Chem. Phys. 99, 8194 (1993)], Monte Carlo simulations of the isobaric–isothermal ensemble of model systems with varied number of objects were undertaken to study the effect of system size on the characteristics and order of the phase transition. A peak in the specific heat vs temperature curve was observed near the transition. For each system size, the maxima of the peak showed a linear dependence on the area, which is characteristic of a first order transition. The latter is further confirmed from the observation of a small “van der Waals’’ loop by increasing the volume at a constant temperature. The result of this simulation matches the qualitative behavior of experimental observations of monolayers, which undergo a weakly f...

Published
1997

9. Identifying the sources driving observed PM2.5 variability over Halifax, Nova Scotia, during BORTAS-B

Author

M. D. Gibson, J. R. Pierce, D. Waugh, J. S. Kuchta, L. Chisholm, T. J. Duck, J. T. Hopper, S. Beauchamp, G. H. King, J. E. Franklin, W. R. Leaitch, A. J. Wheeler, Z. Li, G. A. Gagnon, and P. I. Palmer

Abstract

The source attribution of observed variability of total PM2.5 concentrations over Halifax, Nova Scotia was investigated between 11 July–26 August 2011 using measurements of PM2.5 mass and PM2.5 chemical composition (black carbon, organic matter, anions, cations and 33 elements). This was part of the BORTAS-B (quantifying the impact of BOReal forest fires on Tropospheric oxidants using aircraft and satellites) experiment, which investigated the atmospheric chemistry and transport of seasonal boreal wild fire emissions over eastern Canada in 2011. The US EPA Positive Matrix Factorization (PMF) receptor model was used to determine the average mass (percentage) source contribution over the 45 days, which was estimated to be: Long-Range Transport (LRT) Pollution 1.75 μg m−3 (47%), LRT Pollution Marine Mixture 1.0 μg m−3 (27.9%), Vehicles 0.49 μg m−3 (13.2%), Fugitive Dust 0.23 μg m−3 (6.3%), Ship Emissions 0.13 μg m−3 (3.4%) and Refinery 0.081 μg m−3 (2.2%). The PMF model describes 87% of the observed variability in total PM2.5 mass (bias = 0.17 and RSME = 1.5 μg m−3). The factor identifications are based on chemical markers, and they are supported by air mass back trajectory analysis and local wind direction. Biomass burning plumes, found by other surface and aircraft measurements, were not significant enough to be identified in this analysis. This paper presents the results of the PMF receptor modelling, providing valuable insight into the local and upwind sources impacting surface PM2.5 in Halifax during the BORTAS-B mission.

Published
2013

10. Combined performance tests before installation of the ATLAS semiconductor and transition radiation tracking detectors

Author

E Abat, A Abdesselam, T N Addy, T P A Åkesson, P P Allport, L Andricek, F Anghinolfi, R Apsimon, E Arik, M Arik, N Austin, O K Baker, E Banas, A Bangert, G Barbier, S Baron, A J Barr, S Basiladze, L E Batchelor, R L Bates, J R Batley, M Battistin, G A Beck, A Beddall, A J Beddall, P J Bell, W H Bell, A Belymam, D P Benjamin, J Bernabeu, H Bertelsen, S Bethke, A Bingul, A Bitadze, J P Bizzell, J Blocki, A Bocci, M Bochenek, J Bohm, V G Bondarenko, P Bonneau, C N Booth, O Brandt, F M Brochu, Z Broklova, J Broz, P A Bruckman de Renstrom, S Burdin, C M Buttar, M Capeáns Garrido, L Cardiel Sas, C Carpentieri, A A Carter, J R Carter, A Catinaccio, S A Cetin, M Chamizo llatas, D G Charlton, A Cheplakov, S Chouridou, M L Chu, V Cindro, A Ciocio, J V Civera, A Clark, A P Colijn, T Cornelissen, M J Costa, D Costanzo, J Cox, P Cwetanski, W Dabrowski, J Dalmau, M Dam, K M Danielsen, H Danielsson, S D'Auria, I Dawson, P de Jong, M D Dehchar, B Demirkoz, P Dervan, B Di Girolamo, S Diez Cornell, F Dittus, S D Dixon, E Dobson, O B Dogan, Z Dolezal, B A Dolgoshein, M Donega, M D'Onofrio, T Donszelmann, O Dorholt, J D Dowell, Z Drasal, N Dressnandt, C Driouchi, R Duxfield, M Dwuznik, W L Ebenstein, S Eckert, P Eerola, U Egede, K Egorov, L M Eklund, M Elsing, R Ely, V Eremin, C Escobar, H Evans, P Farthouat, D Fasching, O L Fedin, L Feld, D Ferguson, P Ferrari, D Ferrere, L Fiorini, J Fopma, A J Fowler, H Fox, R S French, D Froidevaux, J A Frost, J Fuster, S Gadomski, P Gagnon, B J Gallop, F C Gannaway, C Garcia, J E Garcia Navarro, I L Gavrilenko, C Gay, N Ghodbane, M D Gibson, S M Gibson, K G Gnanvo, J Godlewski, T Göttfert, S Gonzalez, S Gonzalez-Sevilla, M J Goodrick, A Gorišek, E Gornicki, M Goulette, Y Grishkevich, J Grognuz, J Grosse-Knetter, C Haber, R Härtel, Z Hajduk, M Hance, F H Hansen, J B Hansen, J D Hansen, P H Hansen, K Hara, A Harvey, M Hauschild, C Hauviller, B M Hawes, R J Hawkings, H S Hayward, S J Haywood, F E W Heinemann, N P Hessey, J C Hill, M C Hodgkinson, P Hodgson, T I Hollins, A Holmes, R Holt, S Hou, D F Howell, W Hulsbergen, T Huse, Y Ikegami, Y Ilyushenka, C Issever, J N Jackson, V Jain, K Jakobs, R C Jared, G Jarlskog, P Jarron, L G Johansen, P Johansson, M Jones, T J Jones, D Joos, J Joseph, P Jovanovic, V A Kantserov, J Kaplon, M Karagoz Unel, F Kayumov, P T Keener, G D Kekelidze, N Kerschen, C Ketterer, S H Kim, D Kisielewska, B Kisielewski, T Kittelmann, E B Klinkby, P Kluit, S Kluth, B R Ko, P Kodys, T Koffas, E Koffeman, T Kohriki, T Kondo, N V Kondratieva, S P Konovalov, S Koperny, H Korsmo, S Kovalenko, T Z Kowalski, K Krüger, V Kramarenko, G Kramberger, M Kruse, P Kubik, L G Kudin, N Kundu, C Lacasta, V R Lacuesta, W Lau, A-C Le Bihan, S-C Lee, R P Lefevre, B C LeGeyt, K J C Leney, C G Lester, Z Liang, P Lichard, W Liebig, M Limper, A Lindahl, S W Lindsay, A Lipniacka, G Llosa Llacer, S Lloyd, A Loginov, C W Loh, M Lozano Fantoba, S Lucas, A Lucotte, I Ludwig, J Ludwig, F Luehring, L Luisa, J Lynn, M Maaßen, D Macina, R Mackeprang, A Macpherson, C A Magrath, P Majewski, P Malecki, V P Maleev, I Mandić, M Mandl, M Mangin-Brinet, S Marti i Garcia, A J Martin, F F Martin, T Maruyama, R Mashinistov, A Mayne, K W McFarlane, S J McMahon, T J McMahon, J Meinhardt, B R Mellado Garcia, C Menot, I Messmer, B Mikulec, M Mikuž, S Mima, M Minano, B Mindur, V A Mitsou, P Modesto, S Moed, B Mohn, R M Moles Valls, J Morin, M-C Morone, S V Morozov, J Morris, H G Moser, A Moszczynski, S V Mouraviev, A Munar, W J Murray, K Nagai, Y Nagai, D Naito, K Nakamura, I Nakano, S Y Nesterov, F M Newcomer, R Nicholson, R B Nickerson, T Niinikoski, N Nikitin, R Nisius, H Ogren, S H Oh, M Olcese, J Olszowska, M Orphanides, V O'Shea, W Ostrowicz, B Ottewell, O Oye, E Paganis, M J Palmer, M A Parker, U Parzefall, M S Passmore, S Pataraia, G Pellegrini, H Pernegger, E Perrin, V D Peshekhonov, T C Petersen, R Petti, A W Phillips, P W Phillips, A Placci, K Poltorak, A Poppleton, M J Price, K Prokofiev, O Røhne, C Rembser, P Reznicek, R H Richter, A Robichaud-Veronneau, D Robinson, S Roe, O Rohne, A Romaniouk, L P Rossi, D Rousseau, G Ruggiero, K Runge, Y F Ryabov, A Salzburger, J Sanchez, H Sandaker, J Santander, V A Schegelsky, D Scheirich, J Schieck, M P Schmidt, C Schmitt, E Sedykh, D M Seliverstov, A Sfyrla, T Shin, A Shmeleva, S Sivoklokov, S Yu Smirnov, L Smirnova, O Smirnova, M Söderberg, A O Solberg, V V Sosnovtsev, L Sospedra Suay, H Spieler, G Sprachmann, E Stanecka, S Stapnes, J Stastny, M Stodulski, A Stradling, B Stugu, S Subramania, S I Suchkov, V V Sulin, R R Szczygiel, R Takashima, R Tanaka, G Tartarelli, P K Teng, S Terada, V O Tikhomirov, P Tipton, M Titov, K Toms, A Tonoyan, D R Tovey, A Tricoli, M Turala, M Tyndel, F Ukegawa, M Ullan Comes, Y Unno, V Vacek, S Valkar, J A Valls Ferrer, E van der Kraaij, R VanBerg, V I Vassilakopoulos, L Vassilieva, T Vickey, G H A Viehhauser, E G Villani, J H Vossebeld, T Vu Anh, R Wall, R S Wallny, C Wang, C P Ward, R Wastie, M Webel, M Weber, A R Weidberg, P M Weilhammer, C Weiser, P S Wells, P Werneke, M J White, D Whittington, A Wildauer, I Wilhelm, H H Williams, J A Wilson, M W Wolter, S L Wu, A Zhelezko, H Z Zhu, A Zsenei, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS), Laboratoire de l'Accélérateur Linéaire (LAL), 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), ATLAS, Barbier, Gerard, Chamizo Llatas, Maria, Clark, Allan Geoffrey, D'Onofrio, Monica, Ferrere, Didier, Gadomski, Szymon, Lefevre, Régis, Macina-Buono, Daniela, Mangin-Brinet, Mariane, Mikulec, Bettina, Moed, Shulamit, Morone, Maria Cristina, Perrin, Eric, Robichaud-Veronneau, Andrée, Sfyrla, Anna, Vu Anh, Tuan, and Zsenei, Andras

Subjects
Physics::Instrumentation and Detectors, Transition radiation detectors, ddc:500.2, Tracking (particle physics), 7. Clean energy, 01 natural sciences, Particle detector, Software, Atlas (anatomy), Particle tracking detectors, 0103 physical sciences, medicine, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Solid state detectors, 010306 general physics, Instrumentation, Image resolution, Mathematical Physics, Physics, Large Hadron Collider, 010308 nuclear & particles physics, business.industry, Large detector systems for particle and astroparticle physics, Settore FIS/01 - Fisica Sperimentale, Detector, ATLAS experiment, Electrical engineering, Settore FIS/07 - Fisica Applicata(Beni Culturali, Ambientali, Biol.e Medicin), medicine.anatomical_structure, High Energy Physics::Experiment, business, Computer hardware
Abstract

The ATLAS (A Toroidal LHC ApparatuS) Inner Detector provides charged particle tracking in the centre of the ATLAS experiment at the Large Hadron Collider (LHC). The Inner Detector consists of three subdetectors: the Pixel Detector, the Semiconductor Tracker (SCT), and the Transition Radiation Tracker (TRT). This paper summarizes the tests that were carried out at the final stage of SCT+TRT integration prior to their installation in ATLAS. The combined operation and performance of the SCT and TRT barrel and endcap detectors was investigated through a series of noise tests, and by recording the tracks of cosmic rays. This was a crucial test of hardware and software of the combined tracker detector systems. The results of noise and cross-talk tests on the SCT and TRT in their final assembled configuration, using final readout and supply hardware and software, are reported. The reconstruction and analysis of the recorded cosmic tracks allowed testing of the offline analysis chain and verification of basic tracker performance parameters, such as efficiency and spatial resolution, in combined operation before installation. © 2008 IOP Publishing Ltd. and SISSA.

Published
2008

11. The integration and engineering of the ATLAS SemiConductor Tracker Barrel

Author

Didier Ferrere, Vaclav Vacek, Francis Anghinolfi, Marco Costa, Stanislav Pospisil, Oleg Brandt, B.G. Smith, S. Marti i Garcia, Sofia Chouridou, Alison Holmes, J. Kaplon, Maria Smizanska, A. Tricoli, Fred Gannaway, Bjarne Stugu, Sau Lan Wu, A. W. Phillips, J. P. Bizzell, M. Dehchar, Saverio D'Auria, E. Spencer, J. Benes, Jan Jakubek, Anna Sfyrla, Jacqueline Batley, P. Modesto, G. Barbier, C. Ketterer, T. Maruyama, I. Ludwig, M. Dwuznik, Andrej Gorišek, Daniel Scheirich, P. A. Bruckman de Renstrom, Richard Bates, Ping-Kun Teng, A. Belymam, Richard Nisius, C. P. Ward, D. Joos, Richard French, M. Doubrava, E. G. Villani, Heling Zhu, R. Duxfield, Christian Weiser, John Morris, J. Broz, P. Weilhammer, J. M. Foster, Pavel Reznicek, T. Huse, Alan Barr, F.E.W. Heinemann, James Catmore, T. Hansl-Kozanecka, Fumihiko Ukegawa, Hartmut Sadrozinski, Christopher Lester, Z. Drásal, DJ Attree, P. N. Ratoff, C. Carpentieri, Maksym Titov, M. L. Chu, A. Bangert, J. Jusko, B. Sopko, O. K. Øye, P. J. Bell, Stefan Valkar, G. Hughes, C. N. Booth, P. Sutcliffe, J. Fuster, Christos Anastopoulos, H. Sandaker, V. Sopko, S W Lindsay, F. Fawzi, Stephen Gibson, J. Blocki, I. Wilmut, Siegfried Bethke, S. Stapnes, Andrea Catinaccio, G. Llosa Llacer, B. Demirkoz, S. Roe, Trevor Vickey, I. Wilhelm, R. C. W. Henderson, O. Dorholt, D.P.S. Ferguson, I. P. Duerdoth, Robert Szczygiel, M. Tyndel, Alessandra Ciocio, A O Solberg, Craig Buttar, A. P. Vorobiev, C. Lockett, M.J. Goodrick, Vladimir Cindro, J. Schieck, F. K. Loebinger, Robert Richter, Val O'Shea, G. Gorfine, Michael Andrew Parker, N. Kundu, Vladimír Linhart, T. W. Jones, M. Harris, Dave Charlton, Takahiko Kondo, D. Greenfield, S. Gonzalez-Sevilla, Phillip Allport, J. Meinhardt, D. Chren, O. Jusko, R.L. Wastie, V. Kral, M. Ibbotson, Zhihua Liang, R. Lefèvre, Karl Jakobs, I. Messmer, Anthony Keith Morley, Ladislav Andricek, Efstathios Paganis, S. McMahon, T. J. Sloan, V. R. Lacuesta, J. Fopma, J. Mistry, M Galuska, Kazuhiko Hara, R. Härtel, E. Gornicki, Joleen Pater, R. Holt, Richard Nickerson, J. Stastny, Peter Kodys, B. Mohn, Heinz Pernegger, T. Kohriki, A. Jones, I. Stekl, Helmuth Spieler, K. Nagai, Zdenek Dolezal, J. Dalmau, Shinhong Kim, P.W. Phillips, Ulrich Parzefall, A. G. Kholodenko, S. Moed, Alexander Cheplakov, Bettina Mikulec, Pierre Jarron, T. Horazdovsky, A. J. Lintern, Kazunori Hanagaki, Vakhtang Kartvelishvili, Tim Jones, M. Mangin-Brinet, Paul Hodgson, S. R. Hou, S. Mima, P. Kubik, L E Batchelor, Cigdem Issever, Ian Dawson, N. Austin, Wladyslaw Dabrowski, J. Joseph, Katharine Leney, E. Perrin, Carlos Lacasta, Evelina Vassileva Bouhova-Thacker, V. Koukol, Yasuyoshi Nagai, J. Morin, W. J. Murray, Monica D'Onofrio, T. J. Brodbeck, S. Gonzalez, M. Limper, B. R. Mellado Garcia, D. Fasching, R. Ely, S. Gadomski, A. Greenall, T. I. Hollins, J. Cox, R. J. Thompson, K. M. Danielsen, S. Díez Cornell, Lars Eklund, A A Carter, Joaquin Santander, Sergey Burdin, Lutz Feld, M. C. Morrissey, J. Lynn, Carmen García, W. Lau, G. Lutz, A. Robichaud-Veronneau, A. Hicheur, G. H. A. Viehhauser, Alden Stradling, Kirill Prokofiev, D. Hauff, W. H. Bell, G. F.M. Martinez-Mckinney, Martin White, M. Lozano Fantoba, M. Jones, B. M. Hawes, G. J. Tappern, D. Macina, M. C. Morone, P. Benes, R. Apsimon, Stefan Kluth, N P Hessey, Ewa Stanecka, T. Hayler, L. Sospedra Suay, C.A. Magrath, P. Barclay, Jonathan Butterworth, M. Mikuž, A. G. Clark, M. J. Palmer, Els Koffeman, Yoshinobu Unno, Roger Jones, M. Maaßen, Stephen Haywood, J. Ludwig, K. Runge, Abraham Seiden, T. Atkinson, P. Malecki, Giulio Pellegrini, P Ferrari, M. Turala, T.J. Fraser, Ryuichi Takashima, K. Poltorak, M. Karagoz Unel, A. Nichols, A. Macpherson, P. Ford, Rainer Wallny, N. Ghodbane, M. Olcese, Z. Kohout, M. Miñano, M. Olivo Gomez, R. C. Jared, M. Webel, Stefan Koperny, Fred Hartjes, D. Robinson, J. Freestone, Koji Nakamura, M. Wiesmann, C. Haber, S. Eckert, Reisaburo Tanaka, T. Vu Anh, Z. Broklova, M. Chamizo Llatas, V. N. Riadovikov, Itsuo Nakano, Harald Fox, J. D. Dowell, D. Naito, Joern Grosse-Knetter, G. F. Moorhead, Vaclav Vrba, M. Donega, Mark Hodgkinson, R. M. Moles Valls, Sophio Pataraia, T. Holy, A. P. Colijn, S. W. Snow, Paul Dervan, J. E. García Navarro, Carlos Escobar, B. Ottewell, Michael Solar, P. Werneke, Vitaliy Fadeyev, P. Johansson, T. J. McMahon, J. R. Carter, C. Dabinett, Shih-Chang Lee, P S Wells, J. A. Wilson, Tomas Slavicek, M. Ullan Comes, J.V. Civera, L. G. Johansen, M D Gibson, T. Pritchard, B.J. Gallop, Britt Anderson, J. Tarrant, J. Bohm, E. van der Kraaij, E. Dobson, G. N. Taylor, Daniel Tovey, C. Macwaters, Joost Vossebeld, T. Göttfert, A. Moszczynski, David Howell, R. Fortin, Javier Sánchez, H. G. Moser, Marcin Wladyslaw Wolter, Alexander Grillo, J. Matheson, R. Nicholson, N. Kerschen, Davide Costanzo, Yoichi Ikegami, S. D. Dixon, Igor Mandić, P. Jovanovic, A. Abdesselam, Marc Weber, C. Nelson, A. R. Weidberg, A. J.M. Muijs, Vasiliki A Mitsou, G.A. Beck, J. Bernabeu, A. Zsenei, Marek Stodulski, P. Webb, John Hill, Gregor Kramberger, Susumu Terada, E. Capocci, P. de Jong, K. Sedlak, A. Chilingarov, S. N. Tovey, Barbier, Gerard, Chamizo Llatas, Maria, Clark, Allan Geoffrey, Donega, Mauro, D'Onofrio, Monica, Ferrere, Didier, Gadomski, Szymon, Macina-Buono, Daniela, Mangin-Brinet, Mariane, Mikulec, Bettina, Moed, Shulamit, Morone, Maria Cristina, Perrin, Eric, Robichaud-Veronneau, Andrée, Sfyrla, Anna, Vu Anh, Tuan, and Zsenei, Andras

Subjects
business.industry, Computer science, Integration testing, Detector, Emphasis (telecommunications), Settore FIS/01 - Fisica Sperimentale, Electrical engineering, Barrel (horology), Mechanical engineering, ddc:500.2, Large detector systems for particle and astroparticle physics, Settore FIS/07 - Fisica Applicata(Beni Culturali, Ambientali, Biol.e Medicin), Semiconductor detector, Transition radiation detector, medicine.anatomical_structure, Atlas (anatomy), Particle tracking detectors, medicine, Solid state detectors, Detector design and construction technologies and materials, Detectors and Experimental Techniques, business, Engineering design process, Instrumentation, Mathematical Physics
Abstract

The ATLAS SemiConductor Tracker (SCT) was built in three sections: a barrel and two end-caps. This paper describes the design, construction and final integration of the barrel section. The barrel is constructed around four nested cylinders that provide a stable and accurate support structure for the 2112 silicon modules and their associated services. The emphasis of this paper is directed at the aspects of engineering design that turned a concept into a fully-functioning detector, as well as the integration and testing of large sub-sections of the final SCT barrel detector. The paper follows the chronology of the construction. The main steps of the assembly are described with the results of intermediate tests. The barrel service components were developed and fabricated in parallel so that a flow of detector modules, cooling loops, opto-harnesses and Frequency-Scanning-Interferometry (FSI) alignment structures could be assembled onto the four cylinders. Once finished, each cylinder was conveyed to the next site for the mounting of modules to form a complete single barrel. Extensive electrical and thermal function tests were carried out on the completed single barrels. In the next stage, the four single barrels and thermal enclosures were combined into the complete SCT barrel detector so that it could be integrated with the Transition Radiation Tracker (TRT) barrel to form the central part of the ATLAS inner detector. Finally, the completed SCT barrel was tested together with the TRT barrel in noise tests and using cosmic rays. © 2008 IOP Publishing Ltd and SISSA.

Published
2008

12. Spinal subarachnoid hematoma resulting from lumbar myelography

Author

M D, Sather, M D, Gibson, and J S, Treves

Subjects
Hematoma, Lumbar Vertebrae, Humans, Female, Middle Aged, Subarachnoid Hemorrhage, Radiculopathy, Tomography, X-Ray Computed, Magnetic Resonance Imaging, Myelography, Spine
Abstract

SUMMARY: We describe a rare complication of myelography. A subarachnoid filling defect was apparent on the postmyelographic CT but not on conventional myelography. MR imaging performed later showed a spinal subarachnoid hematoma (SSAH), extending from L3 to L5. Lumbar puncture may rarely be a cause for SSAH and is more common in patients with coagulopathy. Significant back pain, paresis, radiculopathy, and even altered consciousness or meningeal signs may herald an SSAH.

Published
2007

13. Borrelia burgdorferi infection of cats

Author

M D, Gibson, C R, Young, M T, Omran, J, Edwards, K, Palma, L, Russell, and J, Rawlings

Subjects
Lyme Disease, Cats, Animals, Cat Diseases
Published
1993

14. The evaporative cooling system for the ATLAS inner detector

Author

C. Menot, E. Vigeolas, F. McEwan, R. Apsimon, V. Sopko, Siegfried Wenig, J. Thadome, H. Sandaker, S L Nielsen, K. Fowler, A C Smith, J. Tarrant, Danilo Giugni, R. Nicholson, P Ferrari, A. Nichols, S W Lindsay, F Perez-Gomez, S Butterworth, M D Gibson, J. T. Fraser, S. McMahon, P Feraudet, E. Perrin, O. Dorholt, J P Bizzel, Tim Jones, F. Doherty, E. Anderssen, L E Batchelor, L. Luisa, A A Carter, P Bonneau, Leonardo Paolo Rossi, M. Turala, K. Egorov, Richard French, E Danilevich, P. Barclay, Jonathan Butterworth, N. Dixon, J. Kaplon, DJ Attree, Britt Anderson, S. Stapnes, Andrea Catinaccio, G Gariano, P S Wells, B. T. Gorski, John Verlin Morris, M. Doubrava, N. Massol, Koichi Nagai, M. Olcese, A. C. Falou, J N Jackson, P. Werneke, R. J. Hawkings, S Infante, J. R. Carter, P E Nordahl, Jan Godlewski, Stephen Haywood, S Katunin, J. Bendotti, M. Battistin, E. van der Kraaij, Daniel Tovey, H. O. Danielsson, M. Tyndel, A Rovani, A. Bitadze, S. D. Dixon, Richard Nickerson, N. Hartman, M. G. D. Gilchriese, M. Parodi, J. Mistry, M Galuska, Gregory David Hallewell, Heinz Pernegger, F Corbaz, S Berry, D. Muskett, N P Hessey, Vaclav Vacek, Kevin Einsweiler, I Gousakov, E Ruscino, Fred Gannaway, Richard Bates, Marek Stodulski, V Akhnazarov, G. H. A. Viehhauser, M Bosteels, I. Ilyashenko, Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), and ATLAS

Subjects
Physics::Instrumentation and Detectors, Mechanical engineering, Cryogenics, 01 natural sciences, 7. Clean energy, Particle detector, Atlas (anatomy), 0103 physical sciences, medicine, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Detectors and Experimental Techniques, 010306 general physics, Instrumentation, Mathematical Physics, Physics, Large Hadron Collider, 010308 nuclear & particles physics, business.industry, ATLAS experiment, Detector, Electrical engineering, Semiconductor detector, medicine.anatomical_structure, High Energy Physics::Experiment, business, Evaporative cooler
Abstract

This paper describes the evaporative system used to cool the silicon detector structures of the inner detector sub-detectors of the ATLAS experiment at the CERN Large Hadron Collider. The motivation for an evaporative system, its design and construction are discussed. In detail the particular requirements of the ATLAS inner detector, technical choices and the qualification and manufacture of final components are addressed. Finally results of initial operational tests are reported. Although the entire system described, the paper focuses on the on-detector aspects. Details of the evaporative cooling plant will be discussed elsewhere. © 2008 IOP Publishing Ltd and SISSA.

Published
2008

15. Inclusive vector-meson production in the central region of pp collisions at √s = 63 GeV

Author

A. Melin, P. Dam, B. W. Heck, D. W. Wang, W. Witzeling, A. Hallgren, B. Schistad, T. P. A. Åkesson, R. W. Hogue, S. Henning, S. Dagan, Ulf Mjörnmark, J. v. d. Lans, Yona Oren, A. Rudge, J. Lindsay, Howard Gordon, W. M. Evans, V. Burkert, K. H. Hansen, P. Frandsen, W. Frati, J. W. Hiddleston, E. Rosso, Peter R. Lindblom, B. Lörstad, G. Kesseler, W. J. Willis, J. E. Hooper, H. Brody, H. J. Hilke, Michael Albrow, E. Lohse, G. Damgaard, C.W. Fabjan, T. W. Ludlam, L. Rosselet, Ch. J. Wang, I. Dahl-Jensen, M. D. Gibson, A. Di Ciaccio, P. Jeffreys, R. H. Schindler, T. Killian, H. Bøggild, C. L. Woody, Göran Jarlskog, W. R. Molzon, M. Winik, S. Almehed, L. H. Olsen, O. Botner, E. Dahl-Jensen, David Ja Cockerill, Odette Benary, N. A. McCubbin, D. Lissauer, R. Møller, Borge Svane Nielsen, Sherman Frankel, Anders Nilsson, S. Ø. Nielsen, Thomas Ferbel, and Henry Lubatti

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Pion, Meson, Intersecting Storage Rings, Antimatter, Hadron, Transverse mass, Elementary particle, Vector meson, Particle Physics - Experiment
Abstract

Production of rho ^{0}, K*^{0}, and phi have been measured in proton-proton collisions at the CERN Intersecting Storage Rings (ISR) at low p/sub T/ in the central region. The transverse mass spectra are well described by exp (-a mu /sub T/), with a=-6.4+or-0.2 GeV/sup -1/. The cross sections for d sigma /dy mod /sub y=0/ are 6.5+or-0.8+or-1.2 mb for rho ^{0}, 1.9+or-0.3+or-0.3 mb for K*^{0}, 1.9+or-0.3+or-0.3 mb for K*^{0}, and 0.60+or-0.12+or-0.13 mb for phi , where the first error is statistical and the second is systematic.

Published
1982

16. Multiplicity distributions in p-α and α-α collisions in the CERN ISR

Author

L. Rosselet, B. Schistad, Yona Oren, A. Di Ciaccio, R. Møller, T. P. A. Åkesson, H. Hofmann, T. Killian, J. v. d. Lans, W. R. Molzon, T. Ludlam, M. Winik, W. M. Evans, E. Rosso, N. A. McCubbin, C.W. Fabjan, W. J. Willis, P. Frandsen, D. Lissauer, Sherman Frankel, W. Witzeling, A. Hallgren, P. Dam, Michael Albrow, G. Damgaard, L. Madansky, A. Rudge, B. Lörstad, O. Botner, Odette Benary, G. Kesseler, B. W. Heck, Ulf Mjörnmark, Borge Svane Nielsen, A. Melin, I. Dahl-Jensen, J. E. Hooper, P. Jeffreys, Howard Gordon, C. L. Woody, H. Brody, W. Frati, J. W. Hiddleston, S. Almehed, R. H. Schindler, Göran Jarlskog, E. Lohse, L. H. Olsen, David Ja Cockerill, H. Bøggild, M. Wood, Anders Nilsson, M. D. Gibson, K. H. Hansen, E. Dahl-Jensen, S. Dagan, V. Burkert, and H. J. Hilke

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Nuclear Theory, chemistry.chemical_element, Multiplicity (mathematics), Charged particle, Gluon, Nuclear physics, Transverse plane, chemistry, Rapidity, Nuclear Experiment, Nucleon, Helium
Abstract

Measurements of charged particle multiplicity distributions in the central rapidity region in p-p and p-α, and α-α collisions are reported. They are better fitted to the “wounded nucleon” than to the “gluon string” model. The average transverse momenta, for all three reactions, are identical (and almost independent of multiplicity) up to very high multiplicities.

Published
1982

17. Production of prompt positrons at low transverse momentum in 63 GeV pp collisions at the CERN intersecting storage rings

Author

W. A. Zajc, A. A. Carter, P. Jeffreys, R. Carosi, S. Eidelman, I. Mannelli, G. Damgaard, L. K. Resvanis, H. J. Specht, P. Cecil, Göran Jarlskog, G. Piskounov, M. D. Gibson, Torsten Paul Ake Åkesson, H. Bøggild, Sherman Frankel, C. L. Woody, Odette Benary, A. Kalinovsky, K. H. Hansen, W. Frati, J. W. Hiddleston, Y. Choi, B. Lörstad, N. A. McCubbin, T. Killian, S. Mayburov, W. R. Molzon, S. Katsanevas, C.W. Fabjan, M. Winik, Christine Kourkoumelis, Pavlos Ioannou, V. Chernyatin, J. v. d. Lans, I. Dahl-Jensen, E. Anassontzis, E. Dahl-Jensen, J. R. Carter, M. Sullivan, W. M. Evans, I. Stumer, K. Kulka, L. H. Olsen, Howard Gordon, W. J. Willis, P. Frandsen, Michael Albrow, E. Vella, O. Botner, Vincent Hedberg, Ulrich Goerlach, B. Dolgoshein, Y. Goloubkov, Richard Batley, P. Nevsky, T. W. Ludlam, V. Kantserov, Volker D. Burkert, Yona Oren, S. Dagan, R. B. Palmer, G. Thorstenson, J.G. Williamson, Ulf Mjörnmark, G. Kesseler, B. Callen, J. Lindsay, P. Vasiliev, H. Brody, V. Sidorov, A. Rudge, P. Dam, E. Rosso, S. Almehed, T. Jensen, Borge Svane Nielsen, J. A. Thompson, Alevtina Shmeleva, R. Møller, Jurgen Schukraft, D.C. Rahm, W. Cleland, Horst Breuker, A. Markou, R. Kroeger, W. Witzeling, D. Lissauer, I. Gavrilenko, and J. E. Hooper

Subjects
Semileptonic decay, Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Intersecting Storage Rings, Astrophysics::High Energy Astrophysical Phenomena, Hadron, Bremsstrahlung, Nuclear physics, Positron, Transverse momentum, High Energy Physics::Experiment, Charm (quantum number), Nuclear Experiment, Particle Physics - Experiment
Abstract

The production of inclusive prompt positrons in pp collisions at √ s = 63 GeV and θ cm = 90° has been measured over the p T interval 0.08 T GeV c . The e / π ratio rises from ∼ 2 × 10 −4 at p T = 0.9 GeV c to ∼ 1 × 10 −3 at p T = 0.1 GeV c . This is a factor of 6 higher than would be expected from the sum of hadronic bremsstrahlung and the semileptonic decay of charm.

Published
1985

18. A comparison of direct photon, π0 in p and pp interactions at the CERN ISR

Author

K. Kulka, E. Vella, Ulf Mjörnmark, J. Lindsay, E. Rosso, Borge Svane Nielsen, H. Bøggild, M. D. Gibson, Alevtina Shmeleva, Yona Oren, K. H. Hansen, P. Dam, Christine Kourkoumelis, R. Carosi, Vincent Hedberg, E. Dahl-Jensen, T. Ludlam, P. W. Jeffreys, V. Sidorov, W. E. Cleland, C. L. Woody, Odette Benary, H. Specht, S. Katsanevas, C.W. Fabjan, W. Frati, J. W. Hiddleston, Torsten Paul Ake Åkesson, T. Jensen, S. Almehed, J. A. Thompson, Volker D. Burkert, A. Markou, W. A. Zajc, E. G. Anassontzis, G. Damgaard, S. Dagan, Ulrich Goerlach, Y. Choi, R. Kroeger, J. van der Lans, Richard Batley, W. J. Willis, Pavlos Ioannou, Boris Dolgoshein, R. Møller, Howard Gordon, Michael Albrow, I. Stumer, P. Frandsen, I. Dahl-Jensen, G. Thorstenson, V. Kantserov, P. Vasilev, G. Kesseler, A. Nilsson, H. Brody, A. Kalinovsky, A. A. Carter, W. Witzeling, G. Piskounov, T. Killian, L. H. Olsen, A. Rudge, Göran Jarlskog, W. R. Molzon, M.W. Evans, M. Winik, B. Lörstad, Yu. Golubkov, N. A. McCubbin, P. Nevsky, B. Callen, P.C. Cecil, D. Lissauer, Sherman Frankel, J. R. Carter, I. Gavrilenko, I. Mannelli, J. E. Hooper, S. Eidelman, Horst Breuker, S. Maiburov, V. Chernyatin, M. Sullivan, Robert B. Palmer, O. Botner, J.G. Williamson, L. K. Resvanis, Jurgen Schukraft, and D.C. Rahm

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Photon, Significant difference, Rapidity
Abstract

We have measured the production of direct photons, π 0 's, and η's in p p and pp collisions at √ s =53 GeV in the range 2≈ p T ≈6 GeV/ c for the central rapidity region | y | 0.4. No statistically significant difference between pp and pp interactions is observed.

Published
1985

19. Charged particle production and correlations at high transverse momentum at the CERN intersecting storage rings

Author

G. von Dardel, Odette Benary, A. Melin, B. Schistad, David Ja Cockerill, P. Dam, W. M. Evans, H. Bøggild, P. Jeffreys, A. Hallgren, T. Killian, W. R. Molzon, R. Møller, M. Winik, K. H. Hansen, P. Frandsen, Borge Svane Nielsen, S. Henning, J. E. Hooper, B. Lörstad, T. Jensen, Yona Oren, N. A. McCubbin, W. J. Willis, G. Damgaard, Howard Gordon, Michael Albrow, A. Rudge, I. Dahl-Jensen, Torsten Paul Ake Åkesson, L. Rosselet, B. W. Heck, T. W. Ludlam, D. Lissauer, O. Botner, J. Lindsay, E. Lohse, C.W. Fabjan, M. D. Gibson, Anders Nilsson, S. Ø. Nielsen, E. Dahl-Jensen, H. Brody, S. Almehed, V. Burkert, W. Witzeling, H. J. Hilke, S. Dagan, C. L. Woody, W. Frati, J. W. Hiddleston, L. H. Olsen, R. H. Schindler, Göran Jarlskog, Sherman Frankel, J. van der Lans, G. Kesseler, U. Mjörnmark, and E. Rosso

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Range (particle radiation), Large Hadron Collider, Spectrometer, Intersecting Storage Rings, Charged particle, Nuclear physics, Transverse momentum, Particle, Nuclear Experiment, Charged particle beam, Particle Physics - Experiment
Abstract

We study the production of identified charged particles in pp collisions at a c.m. energy of 63 GeV in events with an identified high-pT trigger particle. The measurements were performed at the CERN Intersecting Storage Rings using the Axial Field Spectrometer. Production ratios are presented as a function of pT in the range 2.5 to 8 GeV/c.

Published
1984

20. A comparison of hadron production in and pp collisions in the central region at

Author

J. v. d. Lans, W. M. Evans, I. Stumer, C.W. Fabjan, A. A. Carter, M. Sullivan, R. H. Schindler, M. D. Gibson, P. Frandsen, T. Killian, H. Bøggild, Göran Jarlskog, W. R. Molzon, M. Winik, P. Dam, E. Dahl-Jensen, W. A. Zajc, W. Witzeling, G. Thorstenson, Volker D. Burkert, P. Cecil, H. Hallgren, S. Dagan, B. Lörstad, D. Lissauer, T. Jensen, Torsten Paul Ake Åkesson, L. Rosselet, Sherman Frankel, Yona Oren, O. Botner, R. Kroeger, A. Markap, N.A. McCunnin, H. J. Hilke, P. W. Jeffreys, Odette Benary, R. Bartley, W. E. Cleland, W. Frati, J. W. Hiddleston, Vincent Hedberg, J. R. Carter, E. Rosso, C. L. Woody, W. J. Willis, I. Dahl-Jansen, Michael Albrow, S. Almehed, K. Kulka, J.G. Williamson, T. W. Ludlam, E. Vella, G. Damgaard, J. E. Hooper, Horst Breuker, Borge Svane Nielsen, Ulf Mjörnmark, K. H. Hansen, Ulrich Goerlach, J. Lindsay, Howard Gordon, Anders Nilsson, H. Brody, L. H. Olsen, A. Rudge, David Ja Cockerill, and R. Møller

Subjects
Baryon, Physics, Nuclear physics, Nuclear and High Energy Physics, Pair production, Proton, Hadron, Production (computer science), Atomic physics, Lambda, Positive correlation, Central region
Abstract

We have studied the inclusive production of the hadrons π±, K±, p, p , Λ, Λ , ρ and ⋉ in the central region at the ISR s = 53 GeV , in both pp and p p collisions. Differences are observed only for K±, p, and p production. We then study also correlations between low-pT pp and p p pairs in the two types of collisions, separating the contribution from baryon pair production and from the incident particles (stopping protons). We observe a positive correlation between two stopping protons; between the production of two pairs, and between a stopping proton and a pair production, there are negative correlations.

Published
1983

21. Bose-Einstein correlations in αα, pp and interactions

Author

L. H. Olsen, A. Markou, H. J. Hilke, David Ja Cockerill, J. van der Lans, R. Batley, R. Møller, Odette Benary, I. Dahl-Jensen, Howard Gordon, M. Sullivan, G. Kesseler, P. Cecil, S. Almehed, W. M. Evans, A. Kalinovsky, T. Killian, P. Frandsen, P. Dam, S. Dagan, W. R. Molzon, M. Winik, K. Kulka, R. H. Schindler, Göran Jarlskog, W. J. Willis, E. Vella, C.W. Fabjan, G. Damgaard, Michael Albrow, Ulrich Goerlach, B. Lörstad, Ulf Mjörnmark, Volker D. Burkert, N. A. McCubbin, H. Brody, Yona Oren, C. L. Woody, J. Lindsay, J. R. Carter, Vincent Hedberg, T. Ludlam, E. Rosso, W. Frati, J. W. Hiddleston, A. Rudge, W. A. Zajc, S. U. Chung, D. Lissauer, Anders Nilsson, P. Jeffreys, W. Cleland, Sherman Frankel, B. W. Heck, Horst Breuker, Borge Svane Nielsen, J.G. Williamson, K. H. Hansen, R. Kroeger, W. Witzeling, M. D. Gibson, Torsten Paul Ake Åkesson, L. Rosselet, A. A. Carter, S. Eidelman, E. Dahl-Jensen, O. Botner, H. Bøggild, J. E. Hooper, and G. Thorstenson

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, chemistry.chemical_element, Bose–Einstein correlations, High multiplicity, Central region, Nuclear physics, Particle type, Pion, chemistry, Rapidity, Multiplicity (chemistry), Helium
Abstract

Bose-Einstein correlations between pions produced in the central region of rapidity in αα, pp and p p interactions have been studied at the ISR. The parameters r and τ c -often interpreted as the radius and depth of the π-emitting region - are found to be independent of incident particle type but to depend on the mean charged multiplicity. In high multiplicity events, the pions appear to originate from a larger space-time region.

Published
1983

22. The dominance of jets at large transverse energy in a full-azimuth hadron calorimeter at ISR energies

Author

M. Sullivan, P. Frandsen, S. Dagan, A. A. Carter, R. Carosi, Torsten Paul Ake Åkesson, L. Rosselet, O. Botner, G. Damgaard, G. Thorstenson, Howard Gordon, W. A. Zajc, C. W. Fabjan, S. Almehed, M. D. Gibson, I. Dahl-Jensen, W. J. Willis, P. Jeffreys, Michael Albrow, Ulrich Goerlach, A. Hallgren, T. Ludlam, J. E. Hooper, J. v. d. Lans, S. U. Chung, W. Cleland, Richard Batley, Odette Benary, E. Dahl-Jensen, B. Lörstad, D. Lissauer, W. M. Evans, H. Bøggild, I. Stumer, R. H. Schindler, J. R. Carter, Horst Breuker, Göran Jarlskog, C. L. Woody, W. Frati, J. W. Hiddleston, K. H. Hansen, Anders Nilsson, H. J. Hilke, A. Kalinovsky, S. Eidelman, T. Killian, W. R. Molzon, T. Jensen, M. Winik, R. Kroeger, W. Witzeling, H. Brody, G. Kesseler, P. Cecil, A. Markou, J. G. Williamson, Vincent Hedberg, B. W. Heck, E. Rosso, K. Kulka, E. Vella, Ulf Mjörnmark, J. Lindsay, N. A. McCubbin, Sherman Frankel, L. H. Olsen, P. Dam, David Ja Cockerill, R. Møller, Volker D. Burkert, Yona Oren, Borge Svane Nielsen, and A. Rudge

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Meson, Calorimeter (particle physics), Physics::Instrumentation and Detectors, Hadron, Elementary particle, Azimuth, Nuclear physics, Transverse plane, Pion, Antimatter, High Energy Physics::Experiment, Computer Science::Symbolic Computation, Nuclear Experiment, Particle Physics - Experiment, Computer Science::Distributed, Parallel, and Cluster Computing
Abstract

Events with a large transverse energy in a calorimeter with full azimuthal coverage and |y

Published
1983

23. Properties of jets in high-E T events produced inpp collisions at $$\sqrt s $$ =63 GeV

Author

Odette Benary, N. A. McCubbin, Yona Oren, D. Lissauer, Sherman Frankel, J. R. Carter, P. Cecil, G. Damgaard, H. J. Specht, Y. Choi, Torsten Paul Ake Åkesson, L. Rosselet, O. Botner, Borge Svane Nielsen, L. H. Olsen, Ulrich Goerlach, W. Frati, J. W. Hiddleston, David Ja Cockerill, J. v. d. Lans, Richard Batley, R. Møller, C.W. Fabjan, G. Thorstenson, M. D. Gibson, W. M. Evans, I. Stumer, I. Dahl-Jensen, Horst Breuker, J.G. Williamson, E. Dahl-Jensen, P. Frandsen, W. Witzeling, K. H. Hansen, A. Rudge, U. Mjörnmark, V. Burkert, Vincent Hedberg, E. Rosso, S. Dagan, J. E. Hooper, G. Kesseler, R. Carosi, B. Lörstad, P. Jeffreys, K. Kulka, E. Vella, R. Kroeger, W. J. Willis, Anders Nilsson, B. Callen, S. Eidelman, Michael Albrow, C. L. Woody, P. Dam, J. Lindsay, T. W. Ludlam, S. Almehed, J. A. Thompson, T. Jensen, W. A. Zajc, A. Markou, M. Sullivan, H. Brody, Howard Gordon, A. Kalinovsky, R. H. Schindler, Göran Jarlskog, A. A. Carter, T. Killian, H. Bøggild, W. R. Molzon, W. E. Cleland, M. Winik, and H. J. Hilke

Subjects
Quark, Physics, Particle physics, Annihilation, Large Hadron Collider, Physics and Astronomy (miscellaneous), Intersecting Storage Rings, Astrophysics::High Energy Astrophysical Phenomena, Elementary particle, Charged particle, Gluon, Nuclear physics, Particle acceleration, High Energy Physics::Experiment, Nuclear Experiment, Engineering (miscellaneous)
Abstract

The properties of high-ET events produced inpp collisions at\(\sqrt s \)=63 GeV have been studied at the CERN Intersecting Storage Rings. The fragmentation of the jets is found to be very similar to that of jets produced ine+e− annihilation and at the SPS\(p\bar p\) collider. We measure an excess of soft particles compared withe+e− events and this underlying event is found to be sensitive to the trigger. ThepT balance between the jets is measured. The distribution of charges in the jets indicates that a substantial fraction of the jets originate from valence quarks.

Published
1984

24. A measurement of alpha-alpha elastic scattering at the CERN ISR

Author

L. H. Olsen, D. Weygand, Torsten Paul Ake Åkesson, K. Kulka, H. Bøggild, O. Botner, David Ja Cockerill, R. Møller, M. Sullivan, W. J. Willis, D. Lissauer, Vincent Hedberg, Michael Albrow, J. van der Lans, C.W. Fabjan, W. M. Evans, B. Lörstad, A. Rudge, I. Stumer, Horst Breuker, S. Almehed, E. Vella, S. Dagan, K. H. Hansen, P. Frandsen, I. Dahl-Jensen, J. R. Carter, J. A. Thompson, T. W. Ludlam, Sherman Frankel, Ulrich Goerlach, J. Lindsay, J. G. Williamson, A. A. Carter, Richard Batley, P. Dam, J. E. Hooper, W. A. Zajc, M. J. Goodrick, T. W. Pritchard, H. Brody, Borge Svane Nielsen, G. Damgaard, C. L. Woody, W. Frati, J. W. Hiddleston, R. Kroeger, P. Cecil, Yona Oren, G. Thorstenson, Odette Benary, M. D. Gibson, E. Dahl-Jensen, W. Cleland, S. U. Chung, Göran Jarlskog, Howard Gordon, W. R. Molzon, M. Winik, and N. A. McCubbin

Subjects
Nuclear reaction, Elastic scattering, Physics, Nuclear and High Energy Physics, Range (particle radiation), Particle physics, Scattering, Extrapolation, Alpha particle, Charged particle, Nuclear physics, Cross section (physics), Nuclear Experiment, Particle Physics - Experiment
Abstract

We present measurements of the αα elastic scattering differential cross section at √ s = 126 GeV in the range 0.05 ⩽ ‖ t ‖ c ) 2 . The data give an improved definition of the first cross section minimum at ‖ t ‖ = 0.098 (GeV/ c ) 2 and are consistent with theotheoretical models of nucleus-nucleus scattering. The αα total cross section obtained by extrapolation to the optical point is 280 ± 70 mb.

Published
1985

25. A search for glueballs and a study of double pomeron exchange at the CERN Intersecting Storage Rings

Author

David Ja Cockerill, Odette Benary, Torsten Paul Ake Åkesson, L. Rosselet, Sherman Frankel, O. Botner, J. v. d. Lans, R. Møller, J.G. Williamson, W. M. Evans, I. Stumer, S. Almehed, Borge Svane Nielsen, J. A. Thompson, P. Frandsen, Vincent Hedberg, W. A. Zajc, M. J. Goodrick, A. A. Carter, R. Carosi, A. Rudge, W. Cleland, G. Thorstenson, Y. Oren, A. Markou, M. Sullivan, G. Damgaard, S. Dagan, L. H. Olsen, I. Dahl-Jensen, W. J. Willis, Michael Albrow, N. A. McCubbin, T. W. Ludlam, Göran Jarlskog, E. Rosso, M. D. Gibson, H. J. Hilke, T. W. Pritchard, P. Cecil, K. Kulka, E. Vella, Ulf Mjörnmark, P. Dam, S. U. Chung, E. Dahl-Jensen, J. Lindsay, C. L. Woody, D. Lissauer, W. Frati, J. W. Hiddleston, R. Kroeger, W. Witzeling, Horst Breuker, H. Bøggild, K. H. Hansen, B. Lörstad, C.W. Fabjan, Volker D. Burkert, J. R. Carter, T. Killian, Anders Nilsson, W. R. Molzon, M. Winik, Ulrich Goerlach, Richard Batley, and D. Weygand

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Meson, Intersecting Storage Rings, Partial wave analysis, Scalar (mathematics), Resonance (chemistry), Nuclear physics, Pomeron, Mass spectrum, High Energy Physics::Experiment, Nuclear Experiment, Particle Physics - Experiment
Abstract

We present results from a study of centrally produced mesons in 3 × 106 events with two small-angle protons at the CERN Intersecting Storage Rings. A high-statistics sample of exclusive pp → ppπ+π− events at √s = 63 GeV has been obtained, where the reaction mechanism is dominated by double pomeron exchange. Scalar or tensor glueballs may be produced by this process. The π+π− mass spectrum has a distinctive structure, and analysis shows that the data are dominantly S-wave up to 1600 MeV. The behaviour of the D-wave provides evidence for a 2++ resonance (M = 1480 ± 50 MeV, Γ = 150 ± 50 MeV) in addition to the f(1270). We also show data on exclusive K + K − , p p , and π + π − π + π − production, and on the analogous reaction αα → ααπ+π− at √s = 126 GeV. Flavour independence is suggested by the observation of approximately equal numbers of K+K− and π+π− pairs for mass above 1 GeV. The mass spectra are also apparently independent of √s (45, 63, 126 GeV) and incident particle type (p, α).

Published
1985

26. A comparison of pp and pp interactions in the central region at √s=53 GeV

Author

C. L. Woody, S. Almehed, W.M. Evans, G. Damgaard, R. W. Hogue, H. J. Hilke, J.H. Hiddleston, G. Kesseler, W. Witzeling, A. Hallgren, P. Jeffreys, Odette Benary, B. Lörstad, T. P. A. Åkesson, L. Rosselet, W. J. Willis, S. Dagan, Ch. J. Wang, Michael Albrow, David Ja Cockerill, T. W. Ludlam, Henry Lubatti, L. H. Olsen, R. Møller, A. Di Ciaccio, V. Burkert, J. v. d. Lans, E. Lohse, B. Schistad, T. Killian, H. Bøggild, E. Rosso, M. D. Gibson, W. R. Molzon, Howard Gordon, A. Rudge, K. H. Hansen, J. E. Hooper, M. Winik, P. Frandsen, E. Dahl-Jensen, Anders Nilsson, S. Ø. Nielsen, Thomas Ferbel, R. H. Schindler, S. Henning, Göran Jarlskog, N. A. McCubbin, Ulf Mjörnmark, D. Lissauer, I. Dahl-Jensen, J. Lindsay, D. W. Wang, C.W. Fabjan, Yona Oren, O. Botner, A. Melin, Borge Svane Nielsen, P. Dam, and B. W. Heck

Subjects
Physics, Nuclear and High Energy Physics, Antiparticle, Meson, Nuclear Theory, Hadron, Settore FIS/01 - Fisica Sperimentale, Charged particle, Nuclear physics, Baryon, Pion, Antiproton, Quantum electrodynamics, High Energy Physics::Experiment, Rapidity, Nuclear Experiment
Abstract

The inclusive production cross sections of pions, kaons, protons, and antiprotons in p p and pp interactions at √ s =53 GeV are compared in the kinematic range | y | p T c . We observe differences in the K + /K − and p /p ratios for the two data samples. Although the bulk of the particles are produced with the same momentum and rapidity distributions in p p and pp collisions, we observe difference in these distributions for produced protons and antiprotons.

Published
1982

27. A study of exclusive central hadron production at the ISR as a search for gluonium states

Author

M. D. Gibson, W. A. Zajc, M. J. Goodrick, E. Dahl-Jensen, W. J. Willis, H. Bøggild, Michael Albrow, H. J. Hilke, G. Thorstenson, J. v. d. Lans, J.G. Williamson, P. Jeffreys, W. M. Evans, R. Kroeger, I. Stumer, P. Dam, W. Witzeling, P. Frandsen, T. W. Pritchard, P. Cecil, Vincent Hedberg, A. A. Carter, R. Carosi, S. Dagan, B. Lörstad, L. H. Olsen, M. Sullivan, David Ja Cockerill, G. Damgaard, J. R. Carter, R. Møller, N. A. McCubbin, Borge Svane Nielsen, Sherman Frankel, A. Rudge, Torsten Paul Ake Åkesson, L. Rosselet, H. Brody, O. Botner, S. Almehed, J. E. Hooper, Yona Oren, J. A. Thompson, W. Cleland, Odette Benary, T. Ludlam, Anders Nilsson, C.W. Fabjan, Volker D. Burkert, D. Lissauer, Ulrich Goerlach, Richard Batley, Horst Breuker, I. Dahl-Jensen, K. H. Hansen, C. L. Woody, W. Frati, J. W. Hiddleston, D. Weygand, G. Kesseler, A. Markou, E. Rosso, K. Kulka, E. Vella, Ulf Mjörnmark, J. Lindsay, T. Killian, W. R. Molzon, M. Winik, Howard Gordon, R. H. Schindler, Göran Jarlskog, and S. U. Chung

Subjects
Physics, Nuclear physics, Baryon, Nuclear and High Energy Physics, Antiparticle, Particle physics, Pion, Pair production, Meson, Antimatter, Hadron, Nucleon, Particle Physics - Experiment
Abstract

We present first results from a study of the exclusive reaction pp→pπ+π−p at √s=63 GeV with π+ and π− produced in the central region. This reaction has been suggested as a method of searching for gluonium states. The π+π− mass distribution shows rapid order of magnitude decreases in cross section at both 1000 MeV/c2 and 1500 MeV/c2. Further structure is observed above 2000 MeV/c2.

Published
1983

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