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Comparison of Fragmentation Functions for Jets Dominated by Light Quarks and Gluons from pp and Pb+Pb Collisions in ATLAS

, ; Aaboud, M; Åkesson, Torsten LU ; Bocchetta, Simona LU ; Corrigan, Eric LU ; Doglioni, Caterina LU ; Gregersen, Kristian LU ; Brottmann Hansen, Eva LU ; Hedberg, Vincent LU and Jarlskog, Göran LU , et al. (2019) In Physical Review Letters 123(4).
Abstract
Charged-particle fragmentation functions for jets azimuthally balanced by a high-transverse-momentum, prompt, isolated photon are measured in 25 pb-1 of pp and 0.49 nb-1 of Pb+Pb collision data at 5.02 TeV per nucleon pair recorded with the ATLAS detector at the Large Hadron Collider. The measurements are compared to predictions of Monte Carlo generators and to measurements of inclusively selected jets. In pp collisions, a different jet fragmentation function in photon-tagged events from that in inclusive jet events arises from the difference in fragmentation between light quarks and gluons. The ratios of the fragmentation functions in Pb+Pb events to that in pp events are used to explore the parton color-charge dependence of jet quenching... (More)
Charged-particle fragmentation functions for jets azimuthally balanced by a high-transverse-momentum, prompt, isolated photon are measured in 25 pb-1 of pp and 0.49 nb-1 of Pb+Pb collision data at 5.02 TeV per nucleon pair recorded with the ATLAS detector at the Large Hadron Collider. The measurements are compared to predictions of Monte Carlo generators and to measurements of inclusively selected jets. In pp collisions, a different jet fragmentation function in photon-tagged events from that in inclusive jet events arises from the difference in fragmentation between light quarks and gluons. The ratios of the fragmentation functions in Pb+Pb events to that in pp events are used to explore the parton color-charge dependence of jet quenching in the hot medium. In relatively peripheral collisions, fragmentation functions exhibit a similar modification pattern for photon-tagged and inclusive jets. However, photon-tagged jets are observed to have larger modifications than inclusive jets in central Pb+Pb events. © 2019 CERN. (Less)
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keywords
Charged particles, Colliding beam accelerators, Photons, Tellurium compounds, Charge dependence, Fragmentation functions, Isolated photons, Jet fragmentation, Large Hadron Collider, Monte Carlo generator, Particle fragmentation, Transverse momenta, Lead compounds
in
Physical Review Letters
volume
123
issue
4
publisher
American Physical Society
external identifiers
  • scopus:85071896619
ISSN
1079-7114
DOI
10.1103/PhysRevLett.123.042001
language
English
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yes
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6fffabc8-463d-4ac5-a7f0-8e7593d307cc
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2019-09-19 14:08:44
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2019-11-13 05:41:09
@article{6fffabc8-463d-4ac5-a7f0-8e7593d307cc,
  abstract     = {Charged-particle fragmentation functions for jets azimuthally balanced by a high-transverse-momentum, prompt, isolated photon are measured in 25 pb-1 of pp and 0.49 nb-1 of Pb+Pb collision data at 5.02 TeV per nucleon pair recorded with the ATLAS detector at the Large Hadron Collider. The measurements are compared to predictions of Monte Carlo generators and to measurements of inclusively selected jets. In pp collisions, a different jet fragmentation function in photon-tagged events from that in inclusive jet events arises from the difference in fragmentation between light quarks and gluons. The ratios of the fragmentation functions in Pb+Pb events to that in pp events are used to explore the parton color-charge dependence of jet quenching in the hot medium. In relatively peripheral collisions, fragmentation functions exhibit a similar modification pattern for photon-tagged and inclusive jets. However, photon-tagged jets are observed to have larger modifications than inclusive jets in central Pb+Pb events. © 2019 CERN.},
  articleno    = {042001},
  author       = {,  and Aaboud, M and Åkesson, Torsten and Bocchetta, Simona and Corrigan, Eric and Doglioni, Caterina and Gregersen, Kristian and Brottmann Hansen, Eva and Hedberg, Vincent and Jarlskog, Göran and Kalderon, Charles and Kellermann, Edgar and Konya, Balazs and Lytken, Else and Mankinen, Katja and Mjörnmark, Ulf and Pöttgen, Ruth and Poulsen, Trine and Smirnova, Oxana and Zwalinski, L},
  issn         = {1079-7114},
  keyword      = {Charged particles,Colliding beam accelerators,Photons,Tellurium compounds,Charge dependence,Fragmentation functions,Isolated photons,Jet fragmentation,Large Hadron Collider,Monte Carlo generator,Particle fragmentation,Transverse momenta,Lead compounds},
  language     = {eng},
  number       = {4},
  publisher    = {American Physical Society},
  series       = {Physical Review Letters},
  title        = {Comparison of Fragmentation Functions for Jets Dominated by Light Quarks and Gluons from pp and Pb+Pb Collisions in ATLAS},
  url          = {http://dx.doi.org/10.1103/PhysRevLett.123.042001},
  volume       = {123},
  year         = {2019},
}