第一次直接观察死锥效应
First Direct Observation of the Dead-Cone Effect
摘要：
我们报告的第一个直接测量的死锥效应在对撞机，使用迭代射流去簇技术在PP碰撞在$\sqrt{s} = 13$ TeV。通过对角序C/A树的迭代去簇，揭示了$\rm{D^{0}}$介子在喷流簇射中的分裂。$\rm{D^{0}}$介子引发喷流的分裂历史被映射到隆德平面上，在那里可以进行适当的切割以抑制强子化效应。所报告的变量是相对于$\rm{D^{0}}$介子轴的分裂角，其在每次分裂后更新。基于轨道的射流发现，以及ALICE探测器的带电轨道的低横向动量范围，允许在相空间中精确重建分裂角，其中死锥效应预计是最大的。结果进行了比较包容性射流，死锥效应预计可以忽略不计。
英文摘要：
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.
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