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Hard-photon-triggered jets in p−p and A−A collisions

C. Sirimanna1,2,*, Y. Tachibana3, A. Majumder2, A. Angerami4, R. Arora5, S. A. Bass1, Y. Chen6,7,8, R. Datta2, L. Du9,10,11 et al. (JETSCAPE Collaboration)

L. Du9,10,11, R. Ehlers10,11, H. Elfner12,13,14, R. J. Fries15,16, C. Gale9, Y. He17, B. V. Jacak10,11, P. M. Jacobs10,11, S. Jeon9, Y. Ji18, F. Jonas10,11, L. Kasper8, M. Kordell, II15,16, A. Kumar19,9, R. Kunnawalkam-Elayavalli8, J. Latessa5, Y.-J. Lee6,7, R. Lemmon20, M. Luzum21, S. Mak18, A. Mankolli8, C. Martin22, H. Mehryar5, T. Mengel22, C. Nattrass22, J. Norman23, C. Parker15,16, J.-F. Paquet8, J. H. Putschke2, H. Roch2, G. Roland6,7, B. Schenke24, L. Schwiebert5, A. Sengupta15,16, C. Shen2,25, M. Singh8, D. Soeder1, R. A. Soltz2,4, I. Soudi2,26,27, J. Velkovska8, G. Vujanovic19, X.-N. Wang28,10,11, X. Wu9,2, and W. Zhao2,10,11 (JETSCAPE Collaboration)

  • 1Department of Physics, Duke University, Durham, North Carolina 27708, USA
  • 2Department of Physics and Astronomy, Wayne State University, Detroit, Michigan 48201, USA
  • 3Akita International University, Yuwa, Akita-city 010-1292, Japan
  • 4Lawrence Livermore National Laboratory, Livermore, California 94550, USA
  • 5Department of Computer Science, Wayne State University, Detroit, Michigan 48202, USA
  • 6Laboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
  • 7Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
  • 8Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235, USA
  • 9Department of Physics, McGill University, Montréal QC H3A 2T8, Canada
  • 10Department of Physics, University of California, Berkeley, California 94270, USA
  • 11Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94270, USA
  • 12GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
  • 13Institute for Theoretical Physics, Goethe University, 60438 Frankfurt am Main, Germany
  • 14Frankfurt Institute for Advanced Studies, 60438 Frankfurt am Main, Germany
  • 15Cyclotron Institute, Texas A&M University, College Station, Texas 77843, USA
  • 16Department of Physics and Astronomy, Texas A&M University, College Station, Texas 77843, USA
  • 17School of Physics and Optoelectronics, South China University of Technology, Guangzhou 510640, People's Republic of China
  • 18Department of Statistical Science, Duke University, Durham, North Carolina 27708, USA
  • 19Department of Physics, University of Regina, Regina, SK S4S 0A2, Canada
  • 20Daresbury Laboratory, Daresbury, Warrington, Cheshire WA44AD, United Kingdom
  • 21Instituto de Fìsica, Universidade de São Paulo, C.P. 66318, 05315-970 São Paulo, SP, Brazil
  • 22Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
  • 23Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United Kingdom
  • 24Physics Department, Brookhaven National Laboratory, Upton, New York 11973, USA
  • 25RIKEN BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973, USA
  • 26University of Jyväskylä, Department of Physics, P.O. Box 35, FI-40014 University of Jyväskylä, Finland
  • 27Helsinki Institute of Physics, P.O. Box 64, FI-00014 University of Helsinki, Finland
  • 28Key Laboratory of Quark and Lepton Physics (MOE) and Institute of Particle Physics, Central China Normal University, Wuhan 430079, People's Republic of China

  • *Contact author: chathuranga.sirimanna@duke.edu
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Phys. Rev. C 111, 064911 – Published 17 June, 2025

DOI: https://doi.org/10.1103/yyr5-zp16

Abstract

An investigation of high-transverse-momentum (high-pT) photon-triggered jets in proton-proton (p−p) and ion-ion (A−A) collisions at sNN=0.2 and 5.02TeV is carried out, using the multistage description of in-medium jet evolution. Monte Carlo simulations of hard scattering and energy loss in heavy-ion collisions are performed using parameters tuned in a previous study of the nuclear modification factor (RAA) for inclusive jets and high-pT hadrons. We obtain a good reproduction of the experimental data for photon-triggered jet RAA, as measured by the ATLAS detector, the distribution of the ratio of jet to photon pT (XJγ), measured by both CMS and ATLAS, and the photon-jet azimuthal correlation as measured by CMS. We obtain a moderate description of the photon-triggered jet IAA, as measured by STAR. A noticeable improvement in the comparison is observed when one goes beyond prompt photons and includes bremsstrahlung and decay photons, revealing their significance in certain kinematic regions, particularly at XJγ>1. Moreover, azimuthal angle correlations demonstrate a notable impact of bremsstrahlung photons on the distribution, emphasizing their role in accurately describing experimental results. This work highlights the success of the multistage model of jet modification to straightforwardly predict (this set of) photon-triggered jet observables. This comparison, along with the role played by bremsstrahlung photons, has important consequences on the inclusion of such observables in a future Bayesian analysis.

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Phys. Rev. C 111, 064911– Published 17 June, 2025
  • Received 10 January 2025
  • Accepted 21 April 2025
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