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Measurement of the groomed jet mass in PbPb and pp collisions at √sNN = 5.02 TeV

Measurement of the groomed jet mass in PbPb and pp collisions at √sNN = 5.02 TeV
Measurement of the groomed jet mass in PbPb and pp collisions at √sNN = 5.02 TeV
A measurement of the groomed jet mass in PbPb and pp collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV with the CMS detector at the LHC is presented. Jet grooming is a recursive procedure which sequentially removes soft constituents of a jet until a pair of hard subjets is found. The resulting groomed jets can be used to study modifications to the parton shower evolution in the presence of the hot and dense medium created in heavy ion collisions. Predictions of groomed jet properties from the pythia and herwig++ event generators agree with the measurements in pp collisions. When comparing the results from the most central PbPb collisions to pp data, a hint of an increase of jets with large jet mass is observed, which could originate from additional medium-induced radiation at a large angle from the jet axis. However, no modification of the groomed mass of the core of the jet is observed for all PbPb centrality classes. The PbPb results are also compared to predictions from the jewel and q-pythia event generators, which predict a large modification of the groomed mass not observed in the data.
1029-8479
1-35
Sirunyan, A.M.
846a7137-803d-49de-aae7-d6b85519e829
Tumasyan, A.
6e9fc82d-9104-48e4-8a4d-60f52fdb9ee5
et al.,
867c20e9-3220-49c5-b89e-aac82d31ba5e
Belyaev, Alexander
6bdb9638-5ff9-4b65-a8f2-34bae3ac34b3
The CMS Collaboration
Sirunyan, A.M.
846a7137-803d-49de-aae7-d6b85519e829
Tumasyan, A.
6e9fc82d-9104-48e4-8a4d-60f52fdb9ee5
et al.,
867c20e9-3220-49c5-b89e-aac82d31ba5e
Belyaev, Alexander
6bdb9638-5ff9-4b65-a8f2-34bae3ac34b3

Sirunyan, A.M., Tumasyan, A. and et al., , The CMS Collaboration (2018) Measurement of the groomed jet mass in PbPb and pp collisions at √sNN = 5.02 TeV. Journal of High Energy Physics, 2018 (161), 1-35. (doi:10.1007/JHEP10(2018)161).

Record type: Article

Abstract

A measurement of the groomed jet mass in PbPb and pp collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV with the CMS detector at the LHC is presented. Jet grooming is a recursive procedure which sequentially removes soft constituents of a jet until a pair of hard subjets is found. The resulting groomed jets can be used to study modifications to the parton shower evolution in the presence of the hot and dense medium created in heavy ion collisions. Predictions of groomed jet properties from the pythia and herwig++ event generators agree with the measurements in pp collisions. When comparing the results from the most central PbPb collisions to pp data, a hint of an increase of jets with large jet mass is observed, which could originate from additional medium-induced radiation at a large angle from the jet axis. However, no modification of the groomed mass of the core of the jet is observed for all PbPb centrality classes. The PbPb results are also compared to predictions from the jewel and q-pythia event generators, which predict a large modification of the groomed mass not observed in the data.

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Sirunyan 2018 Article Measurement of The Groomed Jet Mass - Version of Record
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More information

Accepted/In Press date: 16 October 2018
e-pub ahead of print date: 25 October 2018

Identifiers

Local EPrints ID: 426610
URI: http://eprints.soton.ac.uk/id/eprint/426610
ISSN: 1029-8479
PURE UUID: 4fcad5be-1d0d-44b5-aba7-d1e674e34e25
ORCID for Alexander Belyaev: ORCID iD orcid.org/0000-0002-1733-4408

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Date deposited: 03 Dec 2018 17:30
Last modified: 26 Nov 2021 02:52

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Contributors

Author: A.M. Sirunyan
Author: A. Tumasyan
Author: et al.
Corporate Author: The CMS Collaboration

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