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Cold Nuclear Matter Effects on Isolated Prompt Photon and Isolated Prompt Photon+Jet Productions in Relativistic Heavy-Ion Collisions |
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| Authors: | DAI Wei CHEN Shi-Yong ZHANG Ben-Wei WANG En-Ke |
| Institution: | 1. Key Laboratory of Quark and Lepton Physics (MOE) and Institute of Particle Physics, Central China Normal University, Wuhan 430079, China; 2. Nuclear Science Division, MS 70R0319, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA |
| Abstract: | We investigate the cold nuclear matter (CNM) effects on isolated prompt photon and isolated prompt photon associated jet productions in nuclear collisions at the NLO accuracy by using the EPS09 NLO nuclear parton distribution functions and their error sets. Nuclear modification factors of isolated prompt photon and isolated prompt photon+jet productions due to CNM effects in p+A and A+A reactions at the RHIC and the LHC are provided with varying rapidity and transverse momentum of the final state photon. It is shown that the CNM effects on isolated prompt photon and photon+jet are modest, which give a small enhancement at low pT region and a more obvious suppression at large pT at central rapidity. At forward rapidity a pronounced suppression of γ as well as γ+jet is always observed. |
| Keywords: | isolated photon prompt photon photon + jet cold nuclear matter effects heavy ion collisions EPS photon production |
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