Systematic study of nuclear effects in p+Al, p+Au, d+Au, and He 3 + Au collisions at sNN =200 GeV using π0 production
Acharya, U.A. ; Christiansen, P. LU ; Gustafsson, H.-A. LU ; Haslum, E. LU ; Oskarsson, A. LU ; Rosendahl, S.S.E. LU ; Silvermyr, D. LU
; Stenlund, E.
LU
and Zou, L.
(2022)
In Physical Review C
105(6).
- Abstract
- 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... (More)
- 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. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/45441e10-d9d4-43f7-99e8-b5b7be0108bc
- author
- Acharya, U.A.
; Christiansen, P.
LU
; Gustafsson, H.-A.
LU
; Haslum, E.
LU
; Oskarsson, A.
LU
; Rosendahl, S.S.E.
LU
; Silvermyr, D.
LU
; Stenlund, E.
LU
and Zou, L.
- author collaboration
- organization
- publishing date
- 2022
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Physical Review C
- volume
- 105
- issue
- 6
- article number
- 064902
- publisher
- American Physical Society
- external identifiers
-
- scopus:85132354628
- ISSN
- 2469-9985
- DOI
- 10.1103/PhysRevC.105.064902
- language
- English
- LU publication?
- yes
- id
- 45441e10-d9d4-43f7-99e8-b5b7be0108bc
- date added to LUP
- 2022-09-14 10:00:42
- date last changed
- 2023-04-09 21:30:00
@article{45441e10-d9d4-43f7-99e8-b5b7be0108bc,
abstract = {{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.}},
author = {{Acharya, U.A. and Christiansen, P. and Gustafsson, H.-A. and Haslum, E. and Oskarsson, A. and Rosendahl, S.S.E. and Silvermyr, D. and Stenlund, E. and Zou, L.}},
issn = {{2469-9985}},
language = {{eng}},
number = {{6}},
publisher = {{American Physical Society}},
series = {{Physical Review C}},
title = {{Systematic study of nuclear effects in p+Al, p+Au, d+Au, and He 3 + Au collisions at sNN =200 GeV using π0 production}},
url = {{http://dx.doi.org/10.1103/PhysRevC.105.064902}},
doi = {{10.1103/PhysRevC.105.064902}},
volume = {{105}},
year = {{2022}},
}