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

Forward calorimetry in the PHOBOS detector has been used to study charged hadron production in d+Au, p+Au, and n+Au collisions at √sNN =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 pT 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,more » essential for the understanding the medium produced in high-energy nucleus-nucleus collisions.« less
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [5] ;  [6] ;  [7] ;  [5] ;  [6] ;  [5] ;  [8]
  1. Argonne National Lab. (ANL), Argonne, IL (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States); Univ. of Illinois at Chicago, Chicago, IL (United States)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States).
  4. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  5. Brookhaven National Lab. (BNL), Upton, NY (United States)
  6. Univ. of Illinois at Chicago, Chicago, IL (United States)
  7. Univ. of Maryland, College Park, MD (United States)
  8. Brookhaven National Lab. (BNL), Upton, NY (United States). et al.
Publication Date:
OSTI Identifier:
Report Number(s):
Journal ID: ISSN 0556-2813; PRVCAN; KB0201021
Grant/Contract Number:
SC00112704; AC02-98CH10886; FG02-93ER40802; FG02-94ER40818; FG02-94ER40865; FG02-99ER41099; AC02-06CH11357
Accepted Manuscript
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 92; Journal Issue: 3; Journal ID: ISSN 0556-2813
American Physical Society (APS)
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; nucleon-gold; tagged; d+Au; PHOBOS; Relativistic Heavy Ion Collider