arXiv 1202.48382012-02-22hep-phhep-ex

在LHC和CBM实验中预测带电强子多重数

Prediction of Charged Hadron Multiplicity at LHC and CBM Experiments

Ashwini Kumar, P. K. Srivastava, B. K. Singh, C. P. Singh

备注：: 16 pages, 5 figures, 2 tables

摘要：

系统地研究不同碰撞能量下的带电强子多重数（$n_{ch}$）对理解核-核碰撞实验中强子产生的基本机制具有重要意义。此外，核-核碰撞中$n_{ch}$随碰撞能量和质量数的变化也为实验室中夸克胶子等离子体（QGP）的形成提供了一个潜在的探针。本文提出了一个基于组分夸克-夸克相互作用的唯象模型，计算了核-核（$A-A$）碰撞中不同质心能量$(\sqrt{s_{NN}})$下带电强子的平均多重数（$n_{ch}$）和中快度赝快度密度（$(dn_{ch}/dη)_{η=0}$）.首先，我们提出了一个新的参数化的$n_{ch}^{pp}$和$(dn_{ch}/dη)^{pp}_{η=0}$在$p-p$相互作用的基础上，一些初始输入拟合实验数据非常好。我们进一步扩展这种参数化，通过使用简单的唯象假设参与夸克的平均数和平均碰撞次数，获得$A-A$碰撞的$n_{ch}$和$(dn_{ch}/dη)_{η=0}$，并显示它们的依赖性碰撞核的质量数以及$\sqrt{s_{NN}}$。我们还比较了从我们的模型得到的结果与从修改后的Glauber模型得到的结果，以证明两种形式主义之间的差异。最后，我们将我们的模型计算的$A-A$碰撞的带电强子多重数和中快度赝快度密度与各种重离子碰撞实验的实验数据进行了比较，并给出了我们对大型强子对撞机（LHC）和压缩重子物质（CBM）实验中$A-A$碰撞的预测.

英文摘要：

A systematic study of charged hadron multiplicities ($n_{ch}$) at various collision energies is very much important in understanding the basic production mechanism of the hadrons in nucleus-nucleus collision experiments. Furthermore, the variations of $n_{ch}$ in nucleus-nucleus collisions with respect to the colliding energy and mass number can provide a potential probe for the formation of quark gluon plasma (QGP) in the laboratory. In this paper, we propose a phenomenological model based on the constituent quark-quark interactions to calculate the average multiplicity ($n_{ch}$) and pseudorapidity density at mid-rapidity ($(dn_{ch}/dη)_{η=0}$) of charged hadrons at various center-of-mass energies $(\sqrt{s_{NN}})$ for nucleus-nucleus ($A-A$) collisions. We first propose a new parametrization for $n_{ch}^{pp}$ and $(dn_{ch}/dη)^{pp}_{η=0}$ in $p-p$ interactions based on some initial inputs which fit the experimental data very well. We further extend this parametrization by using simple phenomenological assumptions regarding mean number of participating quarks and mean number of collisions to obtain the $n_{ch}$ and $(dn_{ch}/dη)_{η=0}$ for $A-A$ collisions and show their dependencies on the mass number of colliding nuclei as well as on $\sqrt{s_{NN}}$. We also compare the results obtained from our model with the results obtained from the modified Glauber model in order to demonstrate the difference between the two formalisms. Finally, we compare the charged hadron multiplicity and pseudorapidity density at mid-rapidity for $A-A$ collisions obtained from our model with the available experimetal data from various heavy-ion collision experiments and give our predictions for $A-A$ collisions at the Large Hadron Collider (LHC) and at Compressed Baryonic Matter (CBM) experiments.

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