arXiv 1708.094122017-08-30hep-ph

高能核碰撞中的系综平均$\bf p_t$和强子产生

Ensemble-mean $\bf p_t$ and hadron production in high-energy nuclear collisions

Thomas A. Trainor

备注：: 20 pages, 16 figures

摘要：

本文应用高能核碰撞中强子产生的两分量（软+硬）模型（TCM），对相对论重离子对撞机（RHIC）和大型强子对撞机（LHC）的$p$ - $p$、$p$ -Pb和Pb-Pb碰撞的整体平均$p_t$（记为$\bar p_t$）数据进行了处理。该$\bar p_t$ TCM与最近发表的TCM直接相关，该TCM用于来自$p$ - $p$碰撞的$p_t$光谱数据的电荷多重性$n_{ch}$和碰撞能量依赖性。先前研究中观察到的$p$ - $p$光谱硬组分的多重性依赖性与$\bar p_t$硬组分$\bar p_{th}$的类似行为一致。$p$ - $p$ $\bar p_t$ $n_{ch}$依赖性被观察到遵循TCM硬组分的非程函趋势（双射流产生$\propto n_{ch}^2$），而Pb-Pb碰撞的趋势与Glauber A-A中心性模型假设的程函近似一致。$p$ -Pb趋势为中间趋势，从更外围碰撞的非程函$p$ - $p$趋势过渡到更中心碰撞的程函趋势。从$p$ $\bar p_t$数据推断的参与者数$N_{part}$和二元碰撞数$N_{bin}$的多重性依赖性与该系统的Glauber Monte Carlo模型有很大不同。对于$p$ - $p$和$p$ -Pb系统，$n_{ch}$的快速增加和$\bar p_t$的大幅度增加表明最小偏置喷流（TCM硬分量）主导$\bar p_t$变化。在Pb-Pb碰撞中的$\bar p_{th}$的趋势与在更中心的A-A碰撞中喷流形成的定量修正是一致的。

英文摘要：

A two-component (soft + hard) model (TCM) of hadron production in high-energy nuclear collisions is applied to ensemble-mean $p_t$ (denoted by $\bar p_t$) data for $p$-$p$, $p$-Pb and Pb-Pb collisions from the relativistic heavy ion collider (RHIC) and large hadron collider (LHC). This $\bar p_t$ TCM is directly related to a recently-published TCM for the charge-multiplicity $n_{ch}$ and collision-energy dependence of $p_t$ spectrum data from $p$-$p$ collisions. Multiplicity dependence of the $p$-$p$ spectrum hard component observed in the previous study is consistent with similar behavior for $\bar p_t$ hard component $\bar p_{th}$. $p$-$p$ $\bar p_t$ $n_{ch}$ dependence is observed to follow a noneikonal trend for the TCM hard component (dijet production $\propto n_{ch}^2$), whereas the trend for Pb-Pb collisions is consistent with the eikonal approximation assumed for the Glauber A-A centrality model. The $p$-Pb trend is intermediate, transitioning from the noneikonal $p$-$p$ trend for more-peripheral collisions to an eikonal trend for more-central collisions. The multiplicity dependence of participant number $N_{part}$ and binary-collision number $N_{bin}$ inferred from $p$-Pb $\bar p_t$ data differs strongly from a Glauber Monte Carlo model of that system. The rapid increase with $n_{ch}$ and large magnitude of $\bar p_t$ for the $p$-$p$ and $p$-Pb systems suggests that minimum-bias jets (TCM hard component) dominate $\bar p_t$ variation. The trend for $\bar p_{th}$ in Pb-Pb collisions is consistent with quantitative modification of jet formation in more-central A-A collisions.

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。

摘要：

英文摘要：

相关论文