论文标题
$ \ sqrt {s} _ {\ mathrm {nn}} = $ 5.02 tev with a aliCe in $ \ sqrt {s} _ {\ sqrt {s}
Jet splitting measurements in Pb--Pb and pp collisions at $\sqrt{s}_{\mathrm{NN}} =$ 5.02 TeV with ALICE
论文作者
论文摘要
报告了$ \ sqrt {s _ {\ mathrm {nn}}} $ = 5.02 tev中的PB-PB和PP碰撞中喷射分裂的最新测量。这些测量值扫描了射流排放的相空间，以搜索中等诱导的信号，这些信号有望在不同的尺度下出现。这些效果包括多个软辐射，单一硬排放和颜色连贯性。显示了Lund平面图，包括对分裂比例分布的投影$ k _ {\ Mathrm {t}} $，以分裂角度的间隔$ r _ {\ mathrm {g}} $的间隔。软滴修饰物用于访问喷气机内的硬分组，从而实现了修饰子结构变量的测量。这些包括共享动量分数$ z _ {\ mathrm {g}} $之间的两个最难的子jet和软滴分板的数量$ n _ {\ mathrm {sd}} $。将PB-PB碰撞的结果与嵌入PB-PB背景中的Pythia事件进行比较，以将背景与中等效应分开。 $ z _ {\ mathrm {g}} $的测量值和归一化的拆分角$θ_ {\ mathrm {g}} $也将在$ \ sqrt {s} $ = 5.02 tev的pp碰撞中显示在PP碰撞中。
Recent ALICE measurements of jet splittings in Pb--Pb and pp collisions at $\sqrt{s_{\mathrm{NN}}}$ = 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 $k_{\mathrm{T}}$ in intervals of the splitting angle $R_{\mathrm{g}}$. Soft Drop grooming is applied to access hard splittings within the jet, enabling measurements of groomed substructure variables. These include the shared momentum fraction $z_{\mathrm{g}}$ between the two hardest subjets and the number of Soft Drop splittings $n_{\mathrm{SD}}$. 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 $z_{\mathrm{g}}$ and the normalized splitting angle $θ_{\mathrm{g}}$ will also be shown in pp collisions at $\sqrt{s}$ = 5.02 TeV for different grooming settings.
