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Nucleon-gold collisions at 200A GeV using tagged d + Au interactions in the PHOBOS detector

Author(s)
Back, B. B.; Baker, M. D.; Barton, D. S.; Becker, B.; Betts, R. R.; Bickley, A. A.; Bindel, R.; Carroll, A.; García, E.; Gburek, T.; George, N.; Gushue, S.; Halliwell, C.; Hamblen, J.; Harrington, A. S.; Hofman, D. J.; Hollis, R. S.; Hołyński, R.; Holzman, B.; Iordanova, A.; Johnson, E.; Kane, J. L.; Khan, N.; Kuo, C. M.; Lin, W. T.; Manly, S.; Mignerey, A. C.; Nouicer, R.; Olszewski, A.; Pak, R.; Park, I. C.; Pernegger, H.; Sagerer, J.; Sedykh, I.; Skulski, W.; Smith, C. E.; Steinberg, P.; Sukhanov, A.; Tonjes, M. B.; Trzupek, A.; van Nieuwenhuizen, G. J.; Wolfs, F. L. H.; Wosiek, B.; Woźniak, K.; Ballintijn, Maarten; Busza, Wit; Decowski, Michal P.; Gulbrandsen, Kristjan; Henderson, Conor; Kulinich, Petr; Lee, Jang Woo; Reed, Corey; Roland, Christof E.; Roland, Gunther M.; Sarin, Pradeep; Stephans, George S. F.; Vale, Carla; van Nieuwenhuizen, Gerrit Jan; Verdier, Robin; Veres, Gabor; Wyslouch, Boleslaw; Zhang, Jinlong; ... Show more Show less
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Abstract
Forward calorimetry in the PHOBOS detector has been used to study charged hadron production in d + Au, p + Au, and n + Au collisions at √s[subscript NN] = 200 GeV. The forward proton calorimeter detectors are described and a procedure for determining collision centrality with these detectors is detailed. The deposition of energy by deuteron spectator nucleons in the forward calorimeters is used to identify p + Au and n + Au collisions in the data. A weighted combination of the yield of p + Au and n + Au is constructed to build a reference for Au + Au collisions that better matches the isospin composition of the gold nucleus. The p[subscript T] and centrality dependence of the yield of this improved reference system is found to match that of d + Au. The shape of the charged-particle transverse momentum distribution is observed to extrapolate smoothly from p + [bar over p] to central d + Au as a function of the charged-particle pseudorapidity density. The asymmetry of positively and negatively charged hadron production in p + Au is compared to that of n + Au. No significant asymmetry is observed at midrapidity. These studies augment recent results from experiments at the CERN Large Hadron Collider and BNL Relativistic Heavy Ion Collider facilities to give a more complete description of particle production in p + A and d + A collisions, essential for the understanding the medium produced in high-energy nucleus-nucleus collisions.
Date issued
2015-09
URI
http://hdl.handle.net/1721.1/98894
Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Journal
Physical Review C
Publisher
American Physical Society
Citation
Back, B. B., et al. "Nucleon-gold collisions at 200A GeV using tagged d + Au interactions in the PHOBOS detector." Phys. Rev. C 92, 034915 (September 2015). © 2015 American Physical Society
Version: Final published version
ISSN
0556-2813
1089-490X

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