论文标题
$ \ sqrt {s} = 5.02 $ tev的PP碰撞中喷气轴之间的角度测量
Measurement of the angle between jet axes in pp collisions at $\sqrt{s} = 5.02$ TeV
论文作者
论文摘要
本文报告了$ \ sqrt {s} = 5.02 $ tev由爱丽丝协作执行的$ \ sqrt {s} = 5.02 $ tev在PP碰撞中不同定义的喷气轴之间的角度的测量。中间粒度的带电颗粒聚集在带分辨率参数的喷气机中，$ r = 0.2 $和0.4。将射流轴（在软滴修饰之前和之后）与获胜的全部重组方案（WTA）重组方案的射流轴进行了比较。这些轴之间的角度，$Δr_ {\ mathrm {axis}} $，探测了射流形成和进化的宽相空间，从初始高弹药转移散射到强壮过程。 $ 20 <{p _ {p _ {\ mathrm {t}}}^{\ mathrm {ch \; JET}}} <100 $ GEV/$ C $，并与Pythia 8和Herwig 7事件生成器的预测进行了比较。也可以通过与Collins $ - $ SOPER $ -SOPER $ - $ Sterman（CSS）Evolution evolution kernel相关的领先的强发校正进行分析计算分布。介绍了与CSS内核在drell $ -YAN $ -YAN测量中实现的领先的强调校正的分析预测的比较。分析预测描述了扰动制度中20％以内的测量数据，在非扰动制度中也具有令人惊讶的一致性。在JET子结构的背景下，这些结果与CSS内核的普遍性兼容。
This article reports measurements of the angle between differently defined jet axes in pp collisions at $\sqrt{s} = 5.02$ TeV carried out by the ALICE Collaboration. Charged particles at midrapidity are clustered into jets with resolution parameters $R=0.2$ and 0.4. The jet axis, before and after Soft Drop grooming, is compared to the jet axis from the Winner-Takes-All (WTA) recombination scheme. The angle between these axes, $ΔR_{\mathrm{axis}}$, probes a wide phase space of the jet formation and evolution, ranging from the initial high-momentum-transfer scattering to the hadronization process. The $ΔR_{\mathrm{axis}}$ observable is presented for $20 < {p_{\mathrm{T}}^{\mathrm{ch\; jet}}}< 100$ GeV/$c$, and compared to predictions from the PYTHIA 8 and Herwig 7 event generators. The distributions can also be calculated analytically with a leading hadronization correction related to the non-perturbative component of the Collins$-$Soper$-$Sterman (CSS) evolution kernel. Comparisons to analytical predictions at next-to-leading-logarithmic accuracy with leading hadronization correction implemented from experimental extractions of the CSS kernel in Drell$-$Yan measurements are presented. The analytical predictions describe the measured data within 20% in the perturbative regime, with surprising agreement in the non-perturbative regime as well. These results are compatible with the universality of the CSS kernel in the context of jet substructure.
