arXiv 2104.084232021-04-22hep-ph

强子产生的二分量模型在大型强子对撞机5 TeV和13 TeV $\bf p$ - $\bf p$碰撞$\bf p_t$谱中的应用

A two-component model of hadron production applied to $\bf p_t$ spectra from 5 TeV and 13 TeV $\bf p$-$\bf p$ collisions at the large hadron collider

Thomas A. Trainor

备注：: 22 pages, 20 figures

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摘要：

大型强子对撞机（LHC）的ALICE合作最近报道了5 TeV和13 TeV $p$ - $p$碰撞的高统计$p_t$谱数据。基于由首字母缩略词V0 M和SPD表示的两个不相交的伪快度$η$间隔内的总产量，将每个能量的粒子数据划分为事件类。对于每种能量，将两种选择方法产生的光谱与整个事件群体的最小偏倚INEL $> 0$平均值进行比较。名义上的目标是确定喷流在高多重$p$ - $p$碰撞中的作用，特别是喷流对光谱的低$p_t$部分的贡献。一个相关的动机是响应最近的“集体”行为和其他名义指标的夸克-胶子等离子体（QGP）形成的小碰撞系统的索赔。本文将$p$ - $p$碰撞中强子产生的两组分（软+硬）模型（TCM）应用于ALICE谱数据。在以前的各种A-B碰撞系统的TCM研究中，喷流和非喷流对$p$ - $p$谱的贡献在整个$p_t$接受范围内被精确地分离。区别是保持在频谱归一化，射流贡献光谱和系统的偏差导致的V0 M和SPD事件的选择。建立了数据模型差异的统计显著性。{ \em球度}（名义上对射流产生敏感的方位不对称测量）对集合平均$p_t$与事件多重性$n_{ch}$的影响进行了研究，发现与射流产生几乎没有关系。TCM分析的总体结果与$p$ - $p$碰撞中喷流产生的传统QCD描述的预期一致。

英文摘要：

The ALICE collaboration at the large hadron collider (LHC) recently reported high-statistics $p_t$ spectrum data from 5 TeV and 13 TeV $p$-$p$ collisions. Particle data for each energy were partitioned into event classes based on the total yields within two disjoint pseudorapidity $η$ intervals denoted by acronyms V0M and SPD. For each energy the spectra resulting from the two selection methods were then compared to a minimum-bias INEL $> 0$ average over the entire event population. The nominal goal was determination of the role of jets in high-multiplicity $p$-$p$ collisions and especially the jet contribution to the low-$p_t$ parts of spectra. A related motivation was response to recent claims of "collective" behavior and other nominal indicators of quark-gluon plasma (QGP) formation in small collision systems. In the present study a two-component (soft + hard) model (TCM) of hadron production in $p$-$p$ collisions is applied to the ALICE spectrum data. As in previous TCM studies of a variety of A-B collision systems the jet and nonjet contributions to $p$-$p$ spectra are accurately separated over the entire $p_t$ acceptance. Distinction is maintained among spectrum normalizations, jet contributions to spectra and systematic biases resulting from V0M and SPD event selection. The statistical significance of data-model differences is established. The effect of {\em spherocity} (azimuthal asymmetry measure nominally sensitive to jet production) on ensemble-mean $p_t$ vs event multiplicity $n_{ch}$ is investigated and found to have little relation to jet production. The general results of the TCM analysis are as expected from a conventional QCD description of jet production in $p$-$p$ collisions.

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