论文标题
$ \ mathrm中的JET子结构测量值
Jet substructure measurements in $\mathrm{p\kern-0.05em p}$ and $\mbox{Pb-Pb}$ collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV with ALICE
论文作者
论文摘要
我们报告了$ \ MathRM {P \ Kern-0.05em P} $和$ \ mbox {pb-pb} $ collisionS $ \ sqrt {s _ {\ mathrm {nn}}} = 5.02 $ tev fif aliCe detector。使用抗$ k _ {\ mathrm {t}} $算法的分辨率参数$ r = 0.2 $和$ r = 0.4 $，使用Alice跟踪检测器重建了带电的粒子喷气机，并使用Alice跟踪检测器重建。在$ \ mathrm {p \ kern-0.05em p} $碰撞，修饰的喷射动量分数，$ z _ {\ mathrm {g}} $和修饰的喷气radius，$θ_{\ mathrm {\ mathrm {g}}}} \ equiv rm}动态修饰方法。此外，还提出了红外线和共线（IRC）安全的无缝喷射角度的新系统测量。在重型离子碰撞中，我们使用软滴饰算法测量$ z _ {\ mathrm {g}} $和$θ_ {\ mathrm {g}} $。重型离子碰撞中的大型基础事件对重建装饰喷射的可观察物的重建构成了挑战，因为背景中的波动可能会导致修饰分裂的误解。通过使用强大的修饰条件来减少这种背景，我们报告了这些可观察到的物品首次校正了检测器效应和背景波动，并将其与几种理论模型进行比较。
We report jet substructure measurements in $\mathrm{p\kern-0.05em p}$ and $\mbox{Pb-Pb}$ collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV with the ALICE detector. Charged-particle jets were reconstructed at midrapidity with the ALICE tracking detectors using the anti-$k_{\mathrm{T}}$ algorithm with resolution parameters $R=0.2$ and $R=0.4$. In $\mathrm{p\kern-0.05em p}$ collisions, the groomed jet momentum fraction, $z_{\mathrm{g}}$, and the groomed jet radius, $θ_{\mathrm{g}} \equiv R_{\mathrm{g}}/R$, are measured for the first time using the Dynamical Grooming method. Additionally, new systematic measurements of the infrared and collinear (IRC) safe ungroomed jet angularities are presented. In heavy-ion collisions, we measure $z_{\mathrm{g}}$ and $θ_{\mathrm{g}}$ with the Soft Drop grooming algorithm. The large underlying event in heavy-ion collisions poses a challenge for the reconstruction of groomed jet observables, since fluctuations in the background can cause groomed splittings to be misidentified. By using strong grooming conditions to reduce this background, we report these observables fully corrected for detector effects and background fluctuations for the first time, and compare them to several theoretical models.
