Jet splitting measurements in Pb-Pb and pp collisions at √sNN=5.02 TeV with ALICE

被引：1
|
作者：
Havener, Laura [1 ]
机构：
[1] Yale Univ, New Haven, CT 06520 USA
来源：
NUCLEAR PHYSICS A | 2021年 / 1005卷
基金：
英国科学技术设施理事会;
关键词：
Nuclear Physics; Heavy-Ion Collisions; Quark-Gluon Plasma; QCD; Jets; Jet Quenching; Jet Substructure;
D O I：
10.1016/j.nuclphysa.2020.121906
中图分类号：
O57 [原子核物理学、高能物理学];
学科分类号：
070202 ;
摘要：
Recent ALICE measurements of jet splittings in Pb-Pb and pp collisions at root s(NN) = 5.02 TeV are reported. These measurements scan the phase space of jet emissions in search of medium-induced signals which are expected to emerge at different scales. These include effects such as multiple soft-radiation, single hard emissions, and color coherence. The Lund plane diagram is shown, including projections onto distributions of the splitting scale k(T) in intervals of the splitting angle R-g. Soft Drop grooming is applied to access hard splittings within the jet, enabling measurements of groomed substructure variables. These include the shared momentum fraction z(g) between the two hardest subjets and the number of Soft Drop splittings n(SD). The results in Pb-Pb collisions are compared to PYTHIA events embedded into a Pb-Pb background to separate out background from in-medium effects. Measurements of z(g) and the normalized splitting angle theta(g) will also be shown in pp collisions at root s = 5.02 TeV for different grooming settings.
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页数：4
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