Jet-associated deuteron production in pp collisions at s=13 TeV and p-Pb collisions at sNN=5.02 TeV is studied in the coalescence model by using the phase-space information of proton and neutron pairs from a multiphase transport (AMPT) model at the kinetic freezeout. In the low transverse momentum (pT) region pT/A<1.5 GeV/c, where A is the mass number of a nucleus, the in-jet coalescence factor B2In-jet for deuteron production, given by the ratio of the in-jet deuteron number to the square of the in-jet proton number, is found to be larger than the coalescence factor B2 in the medium perpendicular to the jet by a factor of about 10 in pp collisions and of 25 in p−Pb collisions, which are consistent with the ALICE measurements at the LHC. Such large low-momentum enhancements mainly come from coalescence of nucleons inside the jet with the medium nucleons. Coalescence of nucleons inside the jet dominates deuteron production only at the higher pT region of pT/A≳4 GeV/c, where both the yield ratio d/p of deuteron to proton numbers and the B2 are also significantly larger in the jet direction than in the direction perpendicular to the jet due to the strong collinear correlation among particles produced from jet fragmentation. Studying jet-associated deuteron production in relativistic nuclear collisions thus opens up a new window to probe the phase-space structure of nucleons inside jets.

中文翻译：

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射流诱导的 LHC 中 pp 和 p-Pb 碰撞中氘子产生的增强


在聚结模型中，通过使用来自多相传输 （AMPT） 模型的质子和中子对的相空间信息，研究了在动力学冻结时 s=13 TeV 的 pp 碰撞和 sNN=5.02 TeV 的 p-Pb 碰撞中的射流相关氘子产生。在低横向动量 （pT） 区域 pT/A<1.5 GeV/c，其中 A 是原子核的质量数，用于氘子生产的射流内聚结因子 B2In-jet，由射流内氘数与射流内质子数的平方之比给出，发现在垂直于射流的介质中，聚结因子 B2 在 pp 碰撞中比聚结因子 B2 大约 10 倍，在 pp 碰撞中约为 25 倍在 p-Pb 碰撞中，这与 LHC 的 ALICE 测量值一致。这种大型低动量增强主要来自射流内部核子与中等核子的合并。射流内部核子的聚结仅在 pT/A≳4 GeV/c 的较高 pT 区域主导氘子的产生，其中氘子与质子数的产率比 d/p 和 B2 在射流方向上也明显大于垂直于射流的方向，因为射流碎裂产生的颗粒之间具有很强的共线相关性。因此，研究相对论核碰撞中喷流相关的氘子产生为探索喷流内部核子的相空间结构打开了一扇新窗口。