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arXiv 1906.09254hep-ex
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在$\sqrt{s}=13$ TeV的$pp$碰撞中用TeV探测器测量的带电粒子喷射碎裂特性

Properties of jet fragmentation using charged particles measured with the ATLAS detector in $pp$ collisions at $\sqrt{s}=13$ TeV

ATLAS Collaboration

摘要:

本文介绍了一种测量与高能夸克和胶子形成喷注(碎裂)有关的量。在大型强子对撞机上用ATLAS探测器重建了$\sqrt{s}=13$ TeV质子-质子碰撞的积分光度为33 fb $^{-1}$的横向动量为100 GeV $<p_T<$ 2.5 TeV、赝快度为$|η| < 2.1$的喷流.用$p_T > 500$ MeV和$|η| < 2.5$的带电粒子径迹来探测喷流的详细结构。研究了每个事件中两个领先射流中更靠前和更靠中心的射流的破碎特性。展开数据以校正探测器分辨率和接受效果。与部分子簇射蒙特卡罗发生器的比较表明,现有的模型提供了一个合理的描述的数据在很宽的相空间范围内,但也有显着的差异。此外,数据被解释的背景下,夸克和胶子发起的喷气机,利用快度依赖的喷气味分数。带电粒子多重性的第一次测量使用模型独立的喷注标签(主题建模)提供了一个很有前途的替代传统的夸克和胶子提取使用模拟输入。模拟提供了一个合理的描述,在整个喷流$p_T$范围内的夸克数据在此测量,但胶子类数据有系统的带电粒子比模拟少。

英文摘要:

This paper presents a measurement of quantities related to the formation of jets from high-energy quarks and gluons (fragmentation). Jets with transverse momentum 100 GeV $<p_T<$ 2.5 TeV and pseudorapidity $|η| < 2.1$ from an integrated luminosity of 33 fb$^{-1}$ of $\sqrt{s}=13$ TeV proton-proton collisions are reconstructed with the ATLAS detector at the Large Hadron Collider. Charged-particle tracks with $p_T > 500$ MeV and $|η| < 2.5$ are used to probe the detailed structure of the jet. The fragmentation properties of the more forward and the more central of the two leading jets from each event are studied. The data are unfolded to correct for detector resolution and acceptance effects. Comparisons with parton shower Monte Carlo generators indicate that existing models provide a reasonable description of the data across a wide range of phase space, but there are also significant differences. Furthermore, the data are interpreted in the context of quark- and gluon-initiated jets by exploiting the rapidity dependence of the jet flavor fraction. A first measurement of the charged-particle multiplicity using model-independent jet labels (topic modeling) provides a promising alternative to traditional quark and gluon extractions using input from simulation. The simulations provide a reasonable description of the quark-like data across the jet $p_T$ range presented in this measurement, but the gluon-like data have systematically fewer charged particles than the simulations.

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。

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