Measurement of the splitting function in pp and Pb-Pb collisions at sNN =5.02 TeV

Sirunyan, A. M. and Tumasyan, A. R. and Adam, Wolfgang and Ambrogi, Federico and Asilar, Ece and Md. Ali, Mohd. Adli (2018) Measurement of the splitting function in pp and Pb-Pb collisions at sNN =5.02 TeV. Physical Review Letters, 120 (14). ISSN 0031-9007 E-ISSN 1079-7114

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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.

Item Type:	Article (Journal)
Additional Information:	7861/64863
Uncontrolled Keywords:	Splitting Function; pp and Pb-Pb Collisions
Subjects:	Q Science > QC Physics
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Science
Depositing User:	Engku Norulizati Engku Aziz
Date Deposited:	17 Jul 2018 12:37
Last Modified:	30 Oct 2018 17:03
URI:	http://irep.iium.edu.my/id/eprint/64863

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