Origins of the di-jet asymmetry in heavy-ion collisions

The European Physical Journal C

José Guilherme Milhano¹  Korinna Christine Zapp¹ 

[1] CENTRA, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001, Lisbon, Portugal;Physics Department, Theory Unit, CERN, 1211, Geneva 23, Switzerland;

关键词: Parton Shower;    Monte Carlo Event Generator;    Initial Asymmetry;    Initial State Parton Shower;    Initial State Emission;   

DOI  :  10.1140/epjc/s10052-016-4130-9

来源: Springer

【 摘 要 】

The di-jet asymmetry—the measure of the momentum imbalance in a di-jet system—is a key jet quenching observable. Using the event generator Jewel we show that the di-jet asymmetry is dominated by fluctuations both in proton–proton and in heavy-ion collisions. We discuss how in proton–proton collisions the asymmetry is generated through recoil and out-of-cone radiation. In heavy-ion collisions two additional sources can contribute to the asymmetry, namely energy loss fluctuations and differences in path length. The latter is shown to be a sub-leading effect. We discuss the implications of our results for the interpretation of this observable.

【 授权许可】

CC BY