Jet measurements at CMS

C. Baldenegro
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引用次数: 0

Abstract

Recent measurements based on jet production in high energy pp collisions at the CERN LHC with the CMS detector are reported. Specifically, the measurement of the inclusive jet production cross section as a function of the anti-$k_t$ distance parameter $R$ divided by the jet cross section at $R = 0.4$, is discussed. The cross section ratio is sensitive to various perturbative and non-perturbative treatments of the jet formation process in quantum chromodynamics (QCD). In the second study, the regimes of validity of the parton shower and matrix element approaches are tested on multijet events in pp collisions at $\sqrt{s} = 8$ and $13$ TeV. Special attention is given to the second and third leading $p_\text{T}$ jets and their momenta and rapidity-azimuth correlations. Finally, studies of dijet production where the two leading $p_T$ jets are separated by a large pseudorapidity interval void of charged particles is presented. This signature is expected from hard color singlet exchange (two-gluon exchange in perturbative QCD). The latter can be treated with perturbative QCD techniques based on the Balitsky-Fadin-Kuraev-Lipatov (BFKL) evolution equations.
CMS的射流测量
本文报道了最近在欧洲核子研究中心大型强子对撞机上使用CMS探测器对高能pp碰撞中射流产生的测量结果。具体地说,我们讨论了包含射流产生截面作为反k_t距离参数R除以R = 0.4时射流截面的函数的测量。在量子色动力学(QCD)中,截面比对射流形成过程的各种微扰和非微扰处理都很敏感。在第二项研究中,在$\sqrt{s} = 8$和$13$ TeV的pp碰撞中,对部分子阵雨和矩阵元方法的有效性进行了测试。特别注意第二和第三个主要的$p_\text{T}$喷流及其动量和速度-方位角关系。最后,介绍了由带电粒子赝快度间隙空隙分隔两个先导$p_T$射流的dijet生产研究。这种特征可以从硬色单线态交换(微扰QCD中的双胶子交换)中得到。后者可以用基于Balitsky-Fadin-Kuraev-Lipatov (BFKL)进化方程的微扰QCD技术来处理。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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