First measurement of jet mass in Pb-Pb and p-Pb collisions at the LHC

The ALICE Collaboration, S. Acharya, E.J. Brucken, B. Chang, D.J. Kim, V. Litichevskyi, M.M. Mieskolainen, R. Orava, J. Rak, S.S. Räsänen, S. Saarinen, M. Slupecki, T.W. Snellman, W.H. Trzaska, M. Vargyas, J. Viinikainen

Research output: Contribution to journalArticleScientificpeer-review

Abstract

This letter presents the first measurement of jet mass in Pb-Pb and Pb-Pb collisions at root s(NN) = 2.76 TeV and root s(NN) = 5.02 TeV, respectively. Both the jet energy and the jet mass are expected to be sensitive to jet quenching in the hot Quantum Chromodynamics (QCD) matter created in nuclear collisions at collider energies. Jets are reconstructed from charged particles using the anti-k(T) jet algorithm and resolution parameter R = 0.4. The jets are measured in the pseudorapidity range |eta(jet)| <0.5 and in three intervals of transverse momentum between 60 GeV/c and 120 GeV/c. The measurement of the jet mass in central Pb-Pb collisions is compared to the jet mass as measured in p-Pb reference collisions, to vacuum event generators, and to models including jet quenching. It is observed that the jet mass in central Pb-Pb collisions is consistent within uncertainties with p-Pb reference measurements. Furthermore, the measured jet mass in Pb-Pb collisions is not reproduced by the quenching models considered in this letter and is found to be consistent with PYTHIA expectations within systematic uncertainties. (C) 2017 The Author. Published by Elsevier B.V.

Original languageEnglish
JournalPhysics Letters B
Volume776
Pages (from-to)249-264
Number of pages16
ISSN0370-2693
DOIs
Publication statusPublished - 10 Jan 2018
MoE publication typeA1 Journal article-refereed

Fields of Science

  • 114 Physical sciences
  • INDUCED GLUON RADIATION
  • TRANSVERSE-MOMENTUM
  • ROOT-S(NN)=2.76 TEV
  • LEAD COLLISIONS
  • ATLAS DETECTOR
  • SUPPRESSION
  • DEPENDENCE

Cite this

The ALICE Collaboration ; Acharya, S. ; Brucken, E.J. ; Chang, B. ; Kim, D.J. ; Litichevskyi, V. ; Mieskolainen, M.M. ; Orava, R. ; Rak, J. ; Räsänen, S.S. ; Saarinen, S. ; Slupecki, M. ; Snellman, T.W. ; Trzaska, W.H. ; Vargyas, M. ; Viinikainen, J. / First measurement of jet mass in Pb-Pb and p-Pb collisions at the LHC. In: Physics Letters B. 2018 ; Vol. 776. pp. 249-264.
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title = "First measurement of jet mass in Pb-Pb and p-Pb collisions at the LHC",
abstract = "This letter presents the first measurement of jet mass in Pb-Pb and Pb-Pb collisions at root s(NN) = 2.76 TeV and root s(NN) = 5.02 TeV, respectively. Both the jet energy and the jet mass are expected to be sensitive to jet quenching in the hot Quantum Chromodynamics (QCD) matter created in nuclear collisions at collider energies. Jets are reconstructed from charged particles using the anti-k(T) jet algorithm and resolution parameter R = 0.4. The jets are measured in the pseudorapidity range |eta(jet)| <0.5 and in three intervals of transverse momentum between 60 GeV/c and 120 GeV/c. The measurement of the jet mass in central Pb-Pb collisions is compared to the jet mass as measured in p-Pb reference collisions, to vacuum event generators, and to models including jet quenching. It is observed that the jet mass in central Pb-Pb collisions is consistent within uncertainties with p-Pb reference measurements. Furthermore, the measured jet mass in Pb-Pb collisions is not reproduced by the quenching models considered in this letter and is found to be consistent with PYTHIA expectations within systematic uncertainties. (C) 2017 The Author. Published by Elsevier B.V.",
keywords = "114 Physical sciences, INDUCED GLUON RADIATION, TRANSVERSE-MOMENTUM, ROOT-S(NN)=2.76 TEV, LEAD COLLISIONS, ATLAS DETECTOR, SUPPRESSION, DEPENDENCE",
author = "{The ALICE Collaboration} and S. Acharya and E.J. Brucken and B. Chang and D.J. Kim and V. Litichevskyi and M.M. Mieskolainen and R. Orava and J. Rak and S.S. R{\"a}s{\"a}nen and S. Saarinen and M. Slupecki and T.W. Snellman and W.H. Trzaska and M. Vargyas and J. Viinikainen",
year = "2018",
month = "1",
day = "10",
doi = "10.1016/j.physletb.2017.11.044",
language = "English",
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The ALICE Collaboration, Acharya, S, Brucken, EJ, Chang, B, Kim, DJ, Litichevskyi, V, Mieskolainen, MM, Orava, R, Rak, J, Räsänen, SS, Saarinen, S, Slupecki, M, Snellman, TW, Trzaska, WH, Vargyas, M & Viinikainen, J 2018, 'First measurement of jet mass in Pb-Pb and p-Pb collisions at the LHC', Physics Letters B, vol. 776, pp. 249-264. https://doi.org/10.1016/j.physletb.2017.11.044

First measurement of jet mass in Pb-Pb and p-Pb collisions at the LHC. / The ALICE Collaboration; Acharya, S.; Brucken, E.J.; Chang, B.; Kim, D.J.; Litichevskyi, V.; Mieskolainen, M.M.; Orava, R.; Rak, J.; Räsänen, S.S.; Saarinen, S.; Slupecki, M.; Snellman, T.W.; Trzaska, W.H.; Vargyas, M.; Viinikainen, J.

In: Physics Letters B, Vol. 776, 10.01.2018, p. 249-264.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - First measurement of jet mass in Pb-Pb and p-Pb collisions at the LHC

AU - The ALICE Collaboration

AU - Acharya, S.

AU - Brucken, E.J.

AU - Chang, B.

AU - Kim, D.J.

AU - Litichevskyi, V.

AU - Mieskolainen, M.M.

AU - Orava, R.

AU - Rak, J.

AU - Räsänen, S.S.

AU - Saarinen, S.

AU - Slupecki, M.

AU - Snellman, T.W.

AU - Trzaska, W.H.

AU - Vargyas, M.

AU - Viinikainen, J.

PY - 2018/1/10

Y1 - 2018/1/10

N2 - This letter presents the first measurement of jet mass in Pb-Pb and Pb-Pb collisions at root s(NN) = 2.76 TeV and root s(NN) = 5.02 TeV, respectively. Both the jet energy and the jet mass are expected to be sensitive to jet quenching in the hot Quantum Chromodynamics (QCD) matter created in nuclear collisions at collider energies. Jets are reconstructed from charged particles using the anti-k(T) jet algorithm and resolution parameter R = 0.4. The jets are measured in the pseudorapidity range |eta(jet)| <0.5 and in three intervals of transverse momentum between 60 GeV/c and 120 GeV/c. The measurement of the jet mass in central Pb-Pb collisions is compared to the jet mass as measured in p-Pb reference collisions, to vacuum event generators, and to models including jet quenching. It is observed that the jet mass in central Pb-Pb collisions is consistent within uncertainties with p-Pb reference measurements. Furthermore, the measured jet mass in Pb-Pb collisions is not reproduced by the quenching models considered in this letter and is found to be consistent with PYTHIA expectations within systematic uncertainties. (C) 2017 The Author. Published by Elsevier B.V.

AB - This letter presents the first measurement of jet mass in Pb-Pb and Pb-Pb collisions at root s(NN) = 2.76 TeV and root s(NN) = 5.02 TeV, respectively. Both the jet energy and the jet mass are expected to be sensitive to jet quenching in the hot Quantum Chromodynamics (QCD) matter created in nuclear collisions at collider energies. Jets are reconstructed from charged particles using the anti-k(T) jet algorithm and resolution parameter R = 0.4. The jets are measured in the pseudorapidity range |eta(jet)| <0.5 and in three intervals of transverse momentum between 60 GeV/c and 120 GeV/c. The measurement of the jet mass in central Pb-Pb collisions is compared to the jet mass as measured in p-Pb reference collisions, to vacuum event generators, and to models including jet quenching. It is observed that the jet mass in central Pb-Pb collisions is consistent within uncertainties with p-Pb reference measurements. Furthermore, the measured jet mass in Pb-Pb collisions is not reproduced by the quenching models considered in this letter and is found to be consistent with PYTHIA expectations within systematic uncertainties. (C) 2017 The Author. Published by Elsevier B.V.

KW - 114 Physical sciences

KW - INDUCED GLUON RADIATION

KW - TRANSVERSE-MOMENTUM

KW - ROOT-S(NN)=2.76 TEV

KW - LEAD COLLISIONS

KW - ATLAS DETECTOR

KW - SUPPRESSION

KW - DEPENDENCE

U2 - 10.1016/j.physletb.2017.11.044

DO - 10.1016/j.physletb.2017.11.044

M3 - Article

VL - 776

SP - 249

EP - 264

JO - Physics Letters B

JF - Physics Letters B

SN - 0370-2693

ER -