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arXiv 1909.00375hep-phnucl-th
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Glauber Monte Carlo方法中的多重数涨落

Multiplicity fluctuations in the Glauber Monte Carlo approach

Maksym Deliyergiyev, Maciej Rybczynski

摘要:

我们讨论了在核碰撞中产生的带电粒子的多重性波动的测量事件的事件在欧洲核子研究中心SPS的NA49实验中的格劳伯蒙特卡罗方法。我们利用多粒子产生机制中的受伤核子和受伤夸克的概念来刻画多重数分布的标度方差所表示的多重数涨落。尽管受伤核子模型正确地再现了Pb+Pb碰撞中平均多重数的中心依赖性,但它完全不能描述多重数分布标度方差的相应中心依赖性。利用亚核自由度,即受伤夸克模型中的受伤夸克,可以很好地描述质子+质子相互作用中产生的带电粒子的多重数分布。然而,描述质子+质子相互作用中产生的粒子多重数分布参数的受伤夸克模型大大超过了Pb+Pb碰撞中产生的带电粒子的平均多重数。为了获得接近实验测量的Pb+Pb碰撞的平均多重数的值,阴影夸克源的概念实施。采用带阴影源的受伤夸克模型,再现了Pb+Pb碰撞中从最中心到中周边相互作用范围内带电粒子多重数分布的标度方差对中心性的依赖关系.

英文摘要:

We discuss multiplicity fluctuations of charged particles produced in nuclear collisions measured event-by-event by the NA49 experiment at CERN SPS within the Glauber Monte Carlo approach. We use the concepts of wounded nucleons and wounded quarks in the mechanism of multiparticle production to characterize multiplicity fluctuations expressed by the scaled variance of multiplicity distribution. Although Wounded Nucleon Model correctly reproduce the centrality dependence of the average multiplicity in Pb+Pb collisions, it completely fails in description of corresponding centrality dependence of scaled variance of multiplicity distribution. Using subnucleonic degrees of freedom, i.e. wounded quarks within Wounded Quark Model, it is possible to describe quite well the multiplicity distribution of charged particles produced in proton+proton interactions. However, the Wounded Quark Model with parameters describing multiplicity distribution of particles produced in proton+proton interactions substantially exceeds the average multiplicity of charged particles produced in Pb+Pb collisions. To obtain values of average multiplicities close to those experimentally measured in Pb+Pb collisions, the concept of shadowed quark sources is implemented. Wounded Quark Model with implemented shadowing source scenario reproduces the centrality dependence of scaled variance of multiplicity distribution of charged particles produced in Pb+Pb collisions in the range from the most central to mid-peripheral interactions.

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