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19 April 2024

» arxiv » 1505.6766

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Nucleon-Gold Collisions at 200 AGeV Using Tagged d+Au Interactions in PHOBOS
B. B. Back ; M. D. Baker ; M. Ballintijn ; D. S. Barton ; B. Becker ; R. R. Betts ; A. A. Bickley ; R. Bindel ; W. Busza ; A. Carroll ; M. P. Decowski ; E. García ; T. Gburek ; N. George ; K. Gulbrandsen ; S. Gushue ; C. Halliwell ; J. Hamblen ; A. S. Harrington ; C. Henderson ; D. J. Hofman ; R. S. Hollis ; R. Hołyński ; B. Holzman ; A. Iordanova ; E. Johnson ; J. L. Kane ; N. Khan ; P. Kulinich ; C. M. Kuo ; J. W. Lee ; W. T. Lin ; S. Manly ; A. C. Mignerey ; R. Nouicer ; A. Olszewski ; R. Pak ; I. C. Park ; H. Pernegger ; C. Reed ; C. Roland ; G. Roland ; J. Sagerer ; P. Sarin ; I. Sedykh ; W. Skulski ; C. E. Smith ; P. Steinberg ; G. S. F. Stephans ; A. Sukhanov ; M. B. Tonjes ; A. Trzupek ; C. Vale ; G. J. van Nieuwenhuizen ; R. Verdier ; G. I. Veres ; F. L. H. Wolfs ; B. Wosiek ; K. Woźniak ; B. Wysłouch ; J. Zhang ;
Date:	26 May 2015
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 sqrt(s_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_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 pbar+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 mid-rapidity. These studies augment recent results from experiments at the LHC and RHIC 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.
Source:	arXiv, 1505.6766
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