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Systematic study of nuclear effects in p+Al ,  p+Au ,  d+Au , and He 3 + Au collisions at s NN =200 GeV using π0 production

Journal Article · · Physical Review. C
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The PHENIX Collaboration presents a systematic study of inclusive π0 production from p+p, p+Al, p+Au , d+Au , and He3 +Au collisions at s NN =200GeV . Measurements were performed with different centrality selections as well as the total inelastic, 0–100%, selection for all collision systems. For 0–100% collisions, the nuclear-modification factors, RxA , are consistent with unity for pT above 8GeV/c , but exhibit an enhancement in peripheral collisions and a suppression in central collisions. The enhancement and suppression characteristics are similar for all systems for the same centrality class. It is shown that for high- pT-π0 production, the nucleons in the d and He3 interact mostly independently with the Au nucleus and that the counterintuitive centrality dependence is likely due to a physical correlation between multiplicity and the presence of a hard scattering process. These observations disfavor models where parton energy loss has a significant contribution to nuclear modifications in small systems. Nuclear modifications at lower pT resemble the Cronin effect—an increase followed by a peak in central or inelastic collisions and a plateau in peripheral collisions. The peak height has a characteristic ordering by system size as p+Au>d+Au> He3 +Au>p+Al . For collisions with Au ions, current calculations based on initial-state cold nuclear matter effects result in the opposite order, suggesting the presence of other contributions to nuclear modifications, in particular at lower pT .
Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Univ. of Tennessee, Knoxville, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP)
Contributing Organization:
PHENIX Collaboration
Grant/Contract Number:
FG02-96ER40982; SC0012704
OSTI ID:
1875478
Alternate ID(s):
OSTI ID: 2007903
Report Number(s):
BNL--223113-2022-JAAM
Journal Information:
Physical Review. C, Journal Name: Physical Review. C Journal Issue: 6 Vol. 105; ISSN 2469-9985
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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