Systematic study of nuclear effects in p + Al , p + Au , d + Au , and He 3 + Au collisions at s N N = 200 GeV using π 0 production
Journal Article
·
· Physical Review. C
The PHENIX Collaboration presents a systematic study of inclusive production from , and collisions at . 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, , are consistent with unity for above , 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- production, the nucleons in the and 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 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 . 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 .
- 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
Similar Records
Evidence of Quadrupole and Octupole Deformations in
Zr 96 + Zr 96
and
Ru 96 + Ru 96
Collisions at Ultrarelativistic Energies
Coulomb excitation of the| T z | = 1 2 , A = 23 mirror pair
Investigation of the ground-state spin inversion in the neutron-richCl 47 , 49
isotopes
Journal Article
·
Mon Jan 10 19:00:00 EST 2022
· Physical Review Letters
·
OSTI ID:1980253
Coulomb excitation of the
Journal Article
·
Sun Mar 27 20:00:00 EDT 2022
· Physical Review. C
·
OSTI ID:1860849
Investigation of the ground-state spin inversion in the neutron-rich
Journal Article
·
Thu Oct 28 20:00:00 EDT 2021
· Physical Review. C
·
OSTI ID:1979828