Cold Nuclear Matter Effects on Dijet Productions in Relativistic Heavy-ion Reactions at LHC

Details Cold Nuclear Matter Effects on Dijet Productions in Relativistic Heavy-ion Reactions at LHC Cold Nuclear Matter Effects on Dijet Productions in Relativistic Heavy-ion Reactions at LHC

2011-10-30

arxiv.org/abs/1110.6601v2

Eur. Phys. J. C (2012) 72:1904

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 11 figures

Scientific paper

10.1140/epjc/s10052-012-1904-6

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 param-etrization 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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