Cold nuclear matter effects on dijet productions in relativistic heavy-ion reactions at LHC |
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Authors: | Email author" target="_blank">Yuncun?HeEmail author Ben-Wei?Zhang Enke?Wang |
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Institution: | 1.Institute of Particle Physics,Central China Normal University,Wuhan,China;2.Key Laboratory of Quark & Lepton Physics,Central China Normal University, Ministry of Education,Wuhan,China |
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Abstract: | We investigate the cold nuclear matter (CNM) effects on dijet productions in high-energy nuclear collisions at LHC with the
next-to-leading order perturbative QCD. The nuclear modifications for dijet angular distributions, dijet invariant mass spectra,
dijet transverse momentum spectra and dijet momentum imbalance due to CNM effects are calculated by incorporating EPS, EKS,
HKN and DS parametrization sets of parton distributions in nucleus. It is found that dijet angular distributions and dijet
momentum imbalance are insensitive to the initial-state CNM effects and thus provide optimal tools to study the final-state
hot QGP effects such as jet quenching. On the other hand, the invariant mass spectra and the transverse momentum spectra of
dijet are generally enhanced in a wide region of the invariant mass or transverse momentum due to CNM effects with a feature
opposite to the expected suppression because of the final-state parton energy loss effect in the QGP. The difference of EPS,
EKS, HKN and DS parametrization sets of nuclear parton distribution functions is appreciable for dijet invariant mass spectra
and transverse momentum spectra at p+Pb collisions, and becomes more pronounced for those at Pb+Pb reactions. |
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