Nuclear-modification factor of charged hadrons at forward and backward rapidity in p + Al and p + Au collisions at sNN =200 GeV

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Nuclear-modification factor of charged hadrons at forward and backward rapidity in p + Al and p + Au collisions at sNN =200 GeV. / PHENIX Collaboration; Aidala, C.; Oskarsson, Anders; Silvermyr, David; Zou, L.

I: Physical Review C, Vol. 101, Nr. 3, 034910, 16.03.2020.

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

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T1 - Nuclear-modification factor of charged hadrons at forward and backward rapidity in p + Al and p + Au collisions at sNN =200 GeV

AU - PHENIX Collaboration

AU - Aidala, C.

AU - Oskarsson, Anders

AU - Silvermyr, David

AU - Zou, L.

PY - 2020/3/16

Y1 - 2020/3/16

N2 - The PHENIX experiment has studied nuclear effects in p+Al and p+Au collisions at sNN=200GeV on charged hadron production at forward rapidity (1.4<η<2.4, p-going direction) and backward rapidity (-2.2<η<-1.2, A-going direction). Such effects are quantified by measuring nuclear modification factors as a function of transverse momentum and pseudorapidity in various collision multiplicity selections. In central p+Al and p+Au collisions, a suppression (enhancement) is observed at forward (backward) rapidity compared to the binary scaled yields in p+p collisions. The magnitude of enhancement at backward rapidity is larger in p+Au collisions than in p+Al collisions, which have a smaller number of participating nucleons. However, the results at forward rapidity show a similar suppression within uncertainties. The results in the integrated centrality are compared with calculations using nuclear parton distribution functions, which show a reasonable agreement at the forward rapidity but fail to describe the backward rapidity enhancement.

AB - The PHENIX experiment has studied nuclear effects in p+Al and p+Au collisions at sNN=200GeV on charged hadron production at forward rapidity (1.4<η<2.4, p-going direction) and backward rapidity (-2.2<η<-1.2, A-going direction). Such effects are quantified by measuring nuclear modification factors as a function of transverse momentum and pseudorapidity in various collision multiplicity selections. In central p+Al and p+Au collisions, a suppression (enhancement) is observed at forward (backward) rapidity compared to the binary scaled yields in p+p collisions. The magnitude of enhancement at backward rapidity is larger in p+Au collisions than in p+Al collisions, which have a smaller number of participating nucleons. However, the results at forward rapidity show a similar suppression within uncertainties. The results in the integrated centrality are compared with calculations using nuclear parton distribution functions, which show a reasonable agreement at the forward rapidity but fail to describe the backward rapidity enhancement.

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85082688747&origin=inward&txGid

U2 - 10.1103/PhysRevC.101.034910

DO - 10.1103/PhysRevC.101.034910

M3 - Article

VL - 101

JO - Physical Review C

JF - Physical Review C

SN - 2469-9985

IS - 3

M1 - 034910

ER -