论文标题
通过$ j/ψ$生产重合离子碰撞中的Gluon Jet Quench Quench
Unraveling Gluon Jet Quenching through $J/ψ$ Production in Heavy-Ion Collisions
论文作者
论文摘要
长期以来，喷气式淬火一直被视为重型离子碰撞中夸克 - 杜伦等离子体形成的关键特征之一。尽管做出了巨大的努力，但对夸克和格鲁恩喷气淬火的单独识别仍然是一个挑战。在这里，我们表明，高横向动量（$ p_ \ text {t} $）区域的$ j/ψ$提供了一个独特的敏感探针，因为它以高$ p_ \ p_ \ text {t} $的生产尤其由gluon碎片支配着它的高$ p_ \ text {t} $。首先在领先的功率NRQCD分解形式主义的框架内，首先证明了质子 - 普罗顿碰撞基线的基线。然后，我们使用与流体动力学结合使用的线性玻尔兹曼传输模型来模拟核核碰撞核中射流中的相互作用。对两个核修饰因子的实验数据的令人满意的描述$ r _ {\ text {aa}} $和椭圆流$ v_2 $首次揭示了Gluon Jet Quenching是高$ P_ \ p_ \ text {t} $ j/ψ$抑制的高$ p_ \ text {t} $ j/ψ$抑制的驱动力。数据驱动的贝叶斯分析对相关实验测量结果进一步证实了这一新发现，我们还从中获得了夸克 - 格鲁恩等离子体中Gluon能量损失分布的第一个定量提取。
Jet quenching has long been regarded as one of the key signatures for the formation of quark-gluon plasma in heavy-ion collisions. Despite significant efforts, the separate identification of quark and gluon jet quenching has remained as a challenge. Here we show that $J/ψ$ in high transverse momentum ($p_\text{T}$) region provides a uniquely sensitive probe of in-medium gluon energy loss since its production at high $p_\text{T}$ is particularly dominated by gluon fragmentation. Such gluon-dominance is first demonstrated for the baseline of proton-proton collisions within the framework of leading power NRQCD factorization formalism. We then use the linear Boltzmann transport model combined with hydrodynamics for the simulation of jet-medium interaction in nucleus-nucleus collisions. The satisfactory description of experimental data on both nuclear modification factor $R_{\text{AA}}$ and elliptic flow $v_2$ reveals, for the first time, that the gluon jet quenching is the driving force for high $p_\text{T}$ $J/ψ$ suppression. This novel finding is further confirmed by the data-driven Bayesian analyses of relevant experimental measurements, from which we also obtain the first quantitative extraction of the gluon energy loss distribution in the quark-gluon plasma.
