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

A. M. Sirunyan et al. (CMS Collaboration)
Phys. Rev. Lett. 120, 142302 – Published 3 April 2018
Physics logo See Synopsis: Splitting the Jets

Abstract

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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  • Received 30 August 2017

DOI:https://doi.org/10.1103/PhysRevLett.120.142302

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

© 2018 CERN, for the CMS Collaboration

Physics Subject Headings (PhySH)

Nuclear Physics

Synopsis

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Splitting the Jets

Published 3 April 2018

The structure of jets emerging from high-energy collisions of lead ions may provide a new way to study the quark-gluon plasma created in those same collisions.

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Vol. 120, Iss. 14 — 6 April 2018

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