论文标题
$ pp $和AA碰撞中的魅力 - 哈德隆生产
Charm-hadron production in $pp$ and AA collisions
论文作者
论文摘要
LHC的$ PP $，$ P $ -PB和PB-PB碰撞的各种魅力比率的最新测量对重夸克强调的理论理解提出了挑战。 $ PP $中的$λ_C/d^0 $比率和$ P $ -PB碰撞显示的值比$ E^+E^ - $和$ EP $碰撞中发现的值大，并由Monte-Carlo事件生成器预测，该事件发生器基于弦乐片段，低下和中间的横向Momenta（$ P_T $）。在AA碰撞中，$ d_s/d $比率在$ pp $中的值明显增强，而$λ_c/d^0 $数据表示在中间$ p_t $上进一步增强。在这里，我们报告了我们最近的事态发展，以全面描述$ pp $和$ aa $碰撞的魅力辐射化学和运输。对于$ pp $碰撞，我们发现$λ_c/d^0 $数据和模型预测之间的差异大大降低了统计强化模型，该模型在符合型号的范围内被大量的“缺失”状态增强，从而通过deSAy fia DeSay Fiaay Facevown通过decay Facevown为$λ_C造成了贡献。对于$ aa $碰撞，我们为通过事件的逐场模拟实施的魅力 - 巴里昂形成而开发了4个弹药的共振重组模型，该模拟是在运输的魅力和热光 - 夸克分布中占空间摩托车相关性（SMC）的。发现SMC以及增强的魅力 - 巴里昂州，在描述中间动力学的Baryon-Meson增强方面起着重要作用。我们强调了在计算魅力式化学及其与合并模型的动量依赖性时满足正确（相对）化学平衡极限的重要性。
Recent measurements of various charm-hadron ratios in $pp$, $p$-Pb and Pb-Pb collisions at the LHC have posed challenges to the theoretical understanding of heavy-quark hadronization. The $Λ_c/D^0$ ratio in $pp$ and $p$-Pb collisions shows larger values than those found in $e^+e^-$ and $ep$ collisions and predicted by Monte-Carlo event generators based on string fragmentation, at both low and intermediate transverse momenta ($p_T$). In AA collisions, the $D_s/D$ ratio is significantly enhanced over its values in $pp$, while the $Λ_c/D^0$ data indicates a further enhancement at intermediate $p_T$. Here, we report on our recent developments for a comprehensive description of the charm hadrochemistry and transport in $pp$ and $AA$ collisions. For $pp$ collisions we find that the discrepancy between the $Λ_c/D^0$ data and model predictions is much reduced by using a statistical hadronization model augmented by a large set of "missing" states in the charm-baryon spectrum, contributing to the $Λ_c$ via decay feeddown. For $AA$ collisions, we develop a 4-momentum conserving resonance recombination model for charm-baryon formation implemented via event-by-event simulations that account for space-momentum correlations (SMCs) in transported charm- and thermal light-quark distributions. The SMCs, together with the augmented charm-baryon states, are found to play an important role in describing the baryon-to-meson enhancement at intermediate momenta. We emphasize the importance of satisfying the correct (relative) chemical equilibrium limit when computing the charm hadrochemistry and its momentum dependence with coalescence models.
