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arXiv 2312.09705hep-exnucl-ex
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ALICE合作组在强子碰撞中粲与美强子化方面的最新研究结果

Latest ALICE results on charm and beauty hadronisation in hadronic collisions

Jianhui Zhu

AI总结:

ALICE合作组通过13 TeV质子-质子碰撞及5.02 TeV质子-铅碰撞中的粲、美强子产生测量,探究不同碰撞系统和多重数下的重夸克强子化机制,获取了粲碎裂分数、重子产生特性等关键结果。

摘要:

对强子碰撞中的重味介子和重子进行研究,为探究存在大部分子密度时重夸克强子化的特性提供了独特途径——在这种环境下,可能会出现真空碎裂之外的新型强子形成机制。在不同碰撞系统中,按带电粒子多重数区间开展此类测量,有助于理解大小强子碰撞系统中是否存在不同的强子化机制。\n本文展示了质子-质子(pp)碰撞中粲和美产生的部分最新测量结果,这些结果可揭示重夸克强子化机制相较于轻子碰撞的变化。将展示已发表的、质心系能量$\boldsymbol{\sqrt{s}=13}$ TeV的pp碰撞中所有瞬发粲基态产生的新结果,这些结果使我们得以测量粲碎裂分数以及中快度区的总$\rm c\bar{c}$产生截面。还将讨论同一碰撞系统中非瞬发(即源自美强子衰变)$\rm Λ_c^+$重子的最新最终测量结果,以定量比较美强子与粲强子的强子化特性。此外,本文还将呈现质心系能量$\sqrt{s}=13$ TeV的pp碰撞中$\rm Ξ_c^0$产生随带电粒子多重数变化的新测量结果,以及质心系每核子对能量$\sqrt{s_{\rm NN}}=5.02$ TeV的质子-铅(p--Pb)碰撞中$\rm Ξ_c^0$的产生测量结果,进一步揭示粲奇异重子在不同碰撞系统中的强子化规律。

英文摘要:

The study of heavy-flavour mesons and baryons in hadronic collisions provides unique access to the properties of heavy-quark hadronisation in the presence of large partonic densities, where new mechanisms of hadron formation beyond in-vacuum fragmentation can emerge. Performing these measurements in intervals of charged-particle multiplicities across different collision systems provides sensitivity to understand whether different hadronisation mechanisms are at play in small and large hadronic colliding systems. In this contribution, a selection of the latest charm and beauty production measurements in proton--proton (pp) collisions is presented, which can shed light on the modification of the heavy-quark hadronisation mechanisms with respect to leptonic collisions. New published results of the production of all prompt charm ground states in pp collisions at $\sqrt{s}=13$~TeV, which allowed us to measure the charm fragmentation fractions and the total $\rm c\bar{c}$ production cross section at midrapidity, will be shown. The new final measurement of non-prompt (i.e. originating from beauty-hadron decays) $\rm Λ_c^+$ baryons in the same collisions system will be discussed to provide a quantitative comparison between the hadronisation properties of beauty and charm hadrons. New measurements of $\rm Ξ_c^0$ production as a function of charged-particle multiplicity in pp collisions at $\sqrt{s}=13$~TeV, and of $\rm Ξ_c^0$ production in p--Pb collisions at $\sqrt{s_{\rm NN}}=5.02$~TeV, will be also presented, shedding further light on the hadronisation of charm-strange baryons in different colliding systems.

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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