ALICE在大型强子对撞机中的强子化研究

Jianhui Zhu
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引用次数: 3

摘要

重味重子产生的研究对于研究大型强子对撞机的强子化机制具有重要意义,特别是通过研究重子/介子产生比的演化。在大型强子对撞机上进行的pp和p—Pb对撞机的测量揭示了意想不到的特征,在质量上与在重离子对撞机中观察到的相似,并且在魅力区,与先前对$\rm e^+e^-$对撞机和ep对撞机的测量结果不一致。这些结果表明,粲重子的形成可能不是普遍的,重子/介子比取决于碰撞系统或多重性。本文将回顾ALICE对粲重子的测量,包括在pp、p—Pb和Pb—Pb碰撞中$\rm \Lambda_c^+/D^0$作为带电粒子多重性的函数,在pp碰撞和$\rm \Gamma(\Xi_c^0\rightarrow\Xi^-e^+\nu_e)/\Gamma(\Xi_c^0\rightarrow\Xi^-\pi^+)$中$\rm \Sigma_c^{0, +, ++}/D^0$和$\rm \Xi_c^{0, +}/D^0$作为$p_{\rm T}$的函数。与现象学模型的比较也将被讨论。重点将放在讨论这些研究对理解硬离子化过程的影响。
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Hadronization studies at the LHC with ALICE
Studies of the production of heavy-flavour baryons are of prominent importance to investigate hadronization mechanisms at the LHC, in particular through the study of the evolution of the baryon-over-meson production ratio. Measurements performed in pp and p--Pb collisions at the LHC have revealed unexpected features, qualitatively similar to what was observed in heavy-ion collisions and, in the charm sector, not in line with the expectations based on previous measurements from $\rm e^+e^-$ colliders and in ep collisions. These results suggest that charmed baryon formation might not be universal and that the baryon-over-meson ratio depends on the collision system or multiplicity. A review of ALICE measurements of charmed baryons, including $\rm \Lambda_c^+/D^0$ as a function of charged-particle multiplicity in pp, p--Pb and Pb--Pb collisions, $\rm \Sigma_c^{0, +, ++}/D^0$ and $\rm \Xi_c^{0, +}/D^0$ as a function of $p_{\rm T}$ in pp collisions and $\rm \Gamma(\Xi_c^0\rightarrow\Xi^-e^+\nu_e)/\Gamma(\Xi_c^0\rightarrow\Xi^-\pi^+)$, will be presented. Comparison to phenomenological models will be also discussed. Emphasis will be given to the discussion of the impact of these studies on the understanding of hadronization processes.
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