摘要
We investigate cold nuclear matter(CNM) effects on the productions of isolated prompt photons and +jet in proton-lead collisions at 8.16 TeV under next-to-leading order perturbative quantum chromodynamics calculations with four parameterizations for nuclear parton distribution functions(nPDFs), i.e., DSSZ, EPPS16, nCTEQ15, and nIMParton. Our theoretical calculations provide good descriptions of the pp baseline in the ATLAS collaboration and make predictions for future experimental results at p+Pb collisions. We calculate the dependence of the nuclear modification factor of isolated prompt photons on transverse momentum pу/T and pseudo-rapidity η~у at very forward and backward rapidity regions, and we demonstrate that the forward-to-backward yield asymmetries Yasym/pPb as a function of pу/T with different nPDF parameterizations have diverse behaviors. Furthermore, the nuclear modification factor of isolated-у+jet RуJet/pPb as a function of у+jet's pseudo-rapidity η_(уJet)=1/2(η_у+η_(Jet)) at different average transverse momenta pavg/T=1/2(pу/T+pJet/T) has been discussed. This can facilitate a tomographic study of CNM effects with precis locations in a rather wide kinematic region by varying the transverse momenta and rapidities of both isolated photons and jets in p+A collisions.
We investigate cold nuclear matter(CNM) effects on the productions of isolated prompt photons and +jet in proton-lead collisions at 8.16 TeV under next-to-leading order perturbative quantum chromodynamics calculations with four parameterizations for nuclear parton distribution functions(nPDFs), i.e., DSSZ, EPPS16, nCTEQ15, and nIMParton. Our theoretical calculations provide good descriptions of the pp baseline in the ATLAS collaboration and make predictions for future experimental results at p+Pb collisions. We calculate the dependence of the nuclear modification factor of isolated prompt photons on transverse momentum pу/T and pseudo-rapidity η~у at very forward and backward rapidity regions, and we demonstrate that the forward-to-backward yield asymmetries Yasym/pPb as a function of pу/T with different nPDF parameterizations have diverse behaviors. Furthermore, the nuclear modification factor of isolated-у+jet RуJet/pPb as a function of у+jet's pseudo-rapidity η_(уJet)=1/2(η_у+η_(Jet)) at different average transverse momenta pavg/T=1/2(pу/T+pJet/T) has been discussed. This can facilitate a tomographic study of CNM effects with precis locations in a rather wide kinematic region by varying the transverse momenta and rapidities of both isolated photons and jets in p+A collisions.
作者
Guo-Yang Ma
Wei Dai
Ben-Wei Zhang
马国扬;代巍;张本威(Key Laboratory of Quark & Lepton Physics (MOE) and Institute of Particle Physics, Central China Normal University;School of Mathematics and Physics, China University of Geosciences)
基金
Supported by the NSFC of China(11435004,11322546,11805167)
partly Supported by China University of Geosciences(Wuhan)(162301182691)
