Measurement of the Splitting Function in pp and Pb-Pb Collisions at sNN =5.02 TeV

CMS Collaboration

研究成果: 雜誌貢獻期刊論文同行評審

101 引文 斯高帕斯(Scopus)

摘要

Data from heavy ion collisions suggest that the evolution of a parton shower is modified by interactions with the color charges in the dense partonic medium created in these collisions, but it is not known where in the shower evolution the modifications occur. The momentum ratio of the two leading partons, resolved as subjets, provides information about the parton shower evolution. This substructure observable, known as the splitting function, reflects the process of a parton splitting into two other partons and has been measured for jets with transverse momentum between 140 and 500 GeV, in pp and PbPb collisions at a center-of-mass energy of 5.02 TeV per nucleon pair. In central PbPb collisions, the splitting function indicates a more unbalanced momentum ratio, compared to peripheral PbPb and pp collisions.. The measurements are compared to various predictions from event generators and analytical calculations.

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文章編號142302
期刊Physical Review Letters
120
發行號14
DOIs
出版狀態已出版 - 3 4月 2018

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