论文标题
首先直接观察死锥效应
First Direct Observation of the Dead-Cone Effect
论文作者
论文摘要
我们在PP碰撞中使用$ \ sqrt {s} = 13 $ tev的PP碰撞中使用迭代喷射清理技术报告了对山脉的死锥效应的第一个直接测量。该过程通过迭代地将Angular有序的C/A树换成$ \ rm {d^{0}} $ Meson的分裂。 $ \ rm {d^{0}} $ Meson启动喷气机的分裂历史记录被映射到隆德平面上，可以进行适当的切割以抑制强壮的效果。报告的变量是相对于$ \ rm {d^{0}} $ Meson轴的分裂角度，该轴将在每次分割后进行更新。基于轨道的射流发现以及低横向动量达到了爱丽丝探测器的带电轨道，可以准确地重建相位空间中的分裂角度，预计死锥效应将是最大的。将结果与包容性喷气机的结果进行了比较，后者预计死锥效应可以忽略不计。
We report the first direct measurement of the dead-cone effect at colliders, using iterative jet declustering techniques in pp collisions at $\sqrt{s} = 13$ TeV. The procedure exposes the splittings of $\rm{D^{0}}$ mesons in the jet shower, by iteratively declustering the angular ordered C/A tree. The splitting history of the $\rm{D^{0}}$ meson initiated jet is mapped onto the Lund Plane, where appropriate cuts can be made to suppress hadronisation effects. The reported variable is the splitting angle with respect to the $\rm{D^{0}}$ meson axis, which is updated after each splitting. Track-based jet finding, along with the low transverse momentum reach for charged tracks of the ALICE detector, allow for an accurate reconstruction of the splitting angle in the phase-space where the dead-cone effect is expected to be largest. The results are compared to those of inclusive jets, where the dead-cone effect is expected to be negligible.
