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

Back, B. B.; Nouicer, R.; Baker, M. D.; Ballintijn, M.; Barton, D. S.; Becker, B.; Betts, R. R.; Bickley, A. A; Stienberg, P.; Ioradnova, A.; Pak, R.; Sukhanov, A.

doi:10.1103/PhysRevC.92.034915

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

Journal Article · Wed Sep 23 00:00:00 EDT 2015 · Physical Review. C. Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.92.034915· OSTI ID:1226068

Back, B. B. ^[1]; Nouicer, R. ^[2]; Baker, M. D. ^[3]; Ballintijn, M. ^[4]; Barton, D. S. ^[5]; Becker, B. ^[5]; Betts, R. R. ^[6]; Bickley, A. A ^[7]; Stienberg, P. ^[5]; Ioradnova, A. ^[6]; Pak, R. ^[5]; Sukhanov, A. ^[8]

Argonne National Lab. (ANL), Argonne, IL (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States); Univ. of Illinois at Chicago, Chicago, IL (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States).
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States)
Univ. of Illinois at Chicago, Chicago, IL (United States)
Univ. of Maryland, College Park, MD (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States). et al.

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_NN =200GeV. 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_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+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. In conclusion, 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.

View Accepted Manuscript (DOE)

Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: AC02-06CH11357; AC02-98CH10886; FG02-93ER40802; FG02-94ER40818; FG02-94ER40865; FG02-99ER41099

OSTI ID:: 1226068

Alternate ID(s):: OSTI ID: 1224621
OSTI ID: 1391900

Report Number(s):: BNL--108546-2015-JA; KB0201021

Journal Information:: Physical Review. C. Nuclear Physics, Journal Name: Physical Review. C. Nuclear Physics Journal Issue: 3 Vol. 92; ISSN 0556-2813; ISSN PRVCAN

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
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Nucleon-gold collisions at 200A GeV using tagged d + Au interactions in the PHOBOS detector

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