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Peter Christiansen Profile

Peter Christiansen

Professor

Peter Christiansen Profile

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

Author

  • U.A. Acharya
  • P. Christiansen
  • H.-A. Gustafsson
  • E. Haslum
  • A. Oskarsson
  • S.S.E. Rosendahl
  • D. Silvermyr
  • E. Stenlund
  • L. Zou

Summary, in English

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 sNN=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. © 2022 American Physical Society.

Department/s

  • Particle and nuclear physics

Publishing year

2022

Language

English

Publication/Series

Physical Review C

Volume

105

Issue

6

Document type

Journal article

Publisher

American Physical Society

Topic

  • Subatomic Physics

Status

Published

ISBN/ISSN/Other

  • ISSN: 2469-9985