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arXiv 2409.19280hep-phnucl-th
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质子-质子碰撞与重离子碰撞中夸克偶素的产生

Quarkonium production in pp and heavy-ion collisions

Taesoo Song, Joerg Aichelin, Jiaxing Zhao, Pol B. Gossiaux, Elena Bratkovskaya

AI总结:

本文基于Remler形式体系结合PYTHIA与FONLL计算,研究了质子-质子及重离子碰撞中底偶素的产生,并发现夸克偶素内重夸克相互作用率需压低至10%才能与ALICE和CMS数据一致,且Pb+Pb碰撞中非对角重组几乎不发生。

摘要:

我们利用Remler形式体系描述了底偶素不仅在质子-质子碰撞中而且在重离子碰撞中的产生,在该形式体系中夸克偶素密度算符被应用于重夸克与重反夸克对的所有可能组合。在质子-质子碰撞中,重(反)夸克动量由PYTHIA事件生成器提供,并对横动量$p_T$和快度进行重新标度以模拟FONLL计算结果。然后基于不确定性原理引入重夸克与重反夸克之间的空间分离。在重离子碰撞中,假设重夸克势等于热浴中重夸克与重反夸克系统的自由能,夸克偶素波函数随温度变化。每当重夸克或重反夸克在重离子碰撞产生的QGP中发生散射时,密度算符就会更新。假设夸克偶素中重(反)夸克的相互作用率被压低到未束缚重(反)夸克的10%,我们的结果与ALICE和CMS合作组的实验数据一致。我们还发现,即使在$\sqrt{s}=5.02$ TeV的Pb+Pb碰撞中,底偶素的非对角重组也几乎不发生。

英文摘要:

We describe bottomonium production not only in pp collisions but also in heavy-ion collisions by using the Remler's formalism where quarkonium density operator is applied to all possible combination of heavy quark and heavy antiquark pairs. In pp collisions heavy (anti)quark momentum is provided by the PYTHIA event generator after rescaling $p_T$ and rapidity to imitate the FONLL calculations. Then spatial separation between heavy quark and heavy antiquark is introduced based on the uncertainty principle. In heavy-ion collisions quarkonium wavefunction changes with temperature assuming heavy quark potential equals the free energy of heavy quark and heavy antiquark system in heat bath. The density operator is updated whenever heavy quark or heavy antiquark scatters in QGP produced in heavy-ion collisions. Our results are consistent with the experimental data from ALICE and CMS Collaborations assuming that the interaction rate of heavy (anti)quark in quarkonium is suppressed to 10 \% that of unbound heavy (anti)quark. We also find that off-diagonal recombination of bottomonium barely happens even in Pb+Pb collisions at $\sqrt{s}=5.02$ TeV.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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