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arXiv 1604.07697nucl-thnucl-ex
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A+A、p+A和p+p碰撞中的受伤夸克

Wounded quarks in A+A, p+A, and p+p collisions

Piotr Bozek, Wojciech Broniowski, Maciej Rybczynski

摘要:

我们探讨了在超相对论性重离子碰撞中,受伤夸克模型对粒子产生和初态性质的预测。该方法适用于统一的A+A碰撞在一个很宽的碰撞能量范围内,以及在欧洲核子研究中心的大型强子对撞机(LHC)的p+A和p+p碰撞。我们发现,一般来说,受伤夸克对偏心率或初始尺寸等特征的预测与修正二元成分的受伤核子模型的预测接近(在15%以内)。在p+Pb系统中,受伤夸克模型产生的初始火球比标准受伤核子模型产生的小(更致密)。亚核自由度的加入使我们能够以类似的方式分析p+p碰撞,并预测可用于进一步的集体演化。在以前的研究中发现,在A+A碰撞中粒子产生对受伤夸克数量的近似线性依赖,使得基于受伤夸克的方法变得自然。重要的是,在LHC能量下,我们发现从受伤的夸克产生粒子的近似均匀性,在给定的每个核子对碰撞能量下,需要每个源产生类似的初始熵来解释从p+p碰撞到A+A碰撞的粒子产生。我们还讨论了损伤夸克模型预测对核子中夸克分布、核子在核中分布以及碰撞参量中夸克-夸克非弹性分布的敏感性。在我们的程序中,夸克夸克非弹性配置文件被选择在这样一种方式,基于实验的参数化的质子质子非弹性配置文件被正确地再现。叠加多重数分布的参数由p+p和p+Pb数据确定。

英文摘要:

We explore predictions of the wounded quark model for particle production and properties of the initial state formed in ultrarelativistic heavy-ion collisions. The approach is applied uniformly to A+A collisions in a wide collision energy range, as well as for p+A and p+p collisions at the CERN Large Hadron Collider (LHC). We find that generically the predictions from wounded quarks for such features as eccentricities or initial sizes are close (within 15\%) to predictions of the wounded nucleon model with an amended binary component. A larger difference is found for the size in p+Pb system, where the wounded quark model yields a smaller (more compact) initial fireball than the standard wounded nucleon model. The inclusion of subnucleonic degrees of freedom allows us to analyze p+p collisions in an analogous way, with predictions that can be used in further collective evolution. The approximate linear dependence of particle production in A+A collisions on the number of wounded quarks, as found in previous studies, makes the approach based on wounded quarks natural. Importantly, at the LHC energies we find approximate uniformity in particle production from wounded quarks, where at a given collision energy per nucleon pair similar production of initial entropy per source is needed to explain the particle production from p+p collisions up to A+A collisions. We also discuss the sensitivity of the wounded quark model predictions to distribution of quarks in nucleons, distribution of nucleons in nuclei, and to the quark-quark inelasticity profile in the impact parameter. In our procedure, the quark-quark inelasticity profile is chosen in such a way that the experiment-based parametrization of the proton-proton inelasticity profile is properly reproduced. The parameters of the overlaid multiplicity distribution is fixed from p+p and p+Pb data.

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