Exploration of jet substructure using iterative declustering in pp and Pb-Pb collisions at LHC energies
Exploration of jet substructure using iterative declustering in pp and Pb-Pb collisions at LHC energies
复制标题
DOI：
10.1016/j.physletb.2020.135227
复制
发表时间：
2020-03-10
影响因子：
4.4
通讯作者：
Zmeskal, J.
中科院分区：
文献类型：
--
作者：
Acharya, S.;Acosta, F. T.;Zmeskal, J.
欧洲核子研究中心大型强子对撞机的ALICE合作报告了在根s = 7 TeV的pp碰撞和根s（NN）= 2.76 TeV的中心Pb-Pb碰撞中的喷流子结构的新测量。通过迭代去聚类和梳理技术，探索基于轨道的射流的射流子结构。我们给出了pp和Pb-Pb碰撞中通过梳理暴露的两叉子结构的动量共享的测量结果，z（g），以及它对张开角的依赖性。我们还给出了在喷流迭代去簇中获得的分支数量分布的测量结果，该分布被解释为其硬分裂的数量。在Pb-Pb碰撞中，我们观察到对称分裂在大开角的抑制和分裂在小开角相对于PP碰撞的增强，分裂的数量没有显着的修改。结果进行比较，从各种蒙特卡罗事件发生器的预测，以测试的作用，重要的概念，如颜色的连贯性在介质中的射流的演变。(C)2020作者（S）由爱思唯尔公司出版
The ALICE collaboration at the CERN LHC reports novel measurements of jet substructure in pp collisions at root s = 7 TeV and central Pb-Pb collisions at root s(NN) = 2.76 TeV. Jet substructure of track-based jets is explored via iterative declustering and grooming techniques. We present the measurement of the momentum sharing of two-prong substructure exposed via grooming, the z(g), and its dependence on the opening angle, in both pp and Pb-Pb collisions. We also present the measurement of the distribution of the number of branches obtained in the iterative declustering of the jet, which is interpreted as the number of its hard splittings. In Pb-Pb collisions, we observe a suppression of symmetric splittings at large opening angles and an enhancement of splittings at small opening angles relative to pp collisions, with no significant modification of the number of splittings. The results are compared to predictions from various Monte Carlo event generators to test the role of important concepts in the evolution of the jet in the medium such as colour coherence. (C) 2020 The Author(s). Published by Elsevier B.V.