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

Measurement of the Splitting Function in pp and Pb-Pb Collisions at √ sNN = 5.02 TeV
Measurement of the Splitting Function in pp and Pb-Pb Collisions at √ sNN = 5.02 TeV
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.
1079-7114
1-17
Sirunyan, A.M.
846a7137-803d-49de-aae7-d6b85519e829
Belyaev, A.
6bdb9638-5ff9-4b65-a8f2-34bae3ac34b3
The CMS Collaboration
Sirunyan, A.M.
846a7137-803d-49de-aae7-d6b85519e829
Belyaev, A.
6bdb9638-5ff9-4b65-a8f2-34bae3ac34b3

Sirunyan, A.M. and Belyaev, A. , The CMS Collaboration (2018) Measurement of the Splitting Function in pp and Pb-Pb Collisions at √ sNN = 5.02 TeV. Physical Review Letters, 120 (14), 1-17, [142302]. (doi:10.1103/PhysRevLett.120.142302).

Record type: Article

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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PhysRevLett.120.142302 - Version of Record
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e-pub ahead of print date: 3 April 2018
Published date: 6 April 2018

Identifiers

Local EPrints ID: 419640
URI: http://eprints.soton.ac.uk/id/eprint/419640
ISSN: 1079-7114
PURE UUID: ba2696e0-c995-4ec3-8ebd-70075fbb6558
ORCID for A. Belyaev: ORCID iD orcid.org/0000-0002-1733-4408

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Date deposited: 18 Apr 2018 16:30
Last modified: 17 Dec 2019 01:44

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