中国物理学会高能物理分会第十一届全国会员代表大会暨学术年会

Jet quenching has long been regarded as one of the most important signatures for the discovery of Quark-Gluon Plasma created in heavy-ion collisions. Despite significant efforts, separate identification of quark and gluon jet quenching has remained as a challenge. We illustrate for the first time that energetic $J/\psi$ production can be served as a unique probe to the gluon jet quenching mechanism. Within the framework of leading power NRQCD factorization formalism for the baseline of proton-proton collisions, we identify that gluon fragmentation dominates the production of $J/\psi$ in high transverse momentum region. We then implement the linear Boltzmann transport model for the simulation of medium modification, the obtained results of nuclear modification factor $R_{AA}$ and elliptic flow $v_2$ agree with the experimental data, which demonstrates the significance of gluon jet quenching in $J/\psi$ production in nucleus-nucleus collisions. We further verify such effect by performing a fully data-driven analysis of the experimental data with Bayesian technique, which allows us to extract quantitatively the gluon jet quenching in high energy heavy-ion collisions.