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

Journal Article · Tue Jun 17 00:00:00 EDT 2025 · Physical Review. C

DOI:https://doi.org/10.1103/yyr5-zp16· OSTI ID:2572807

Sirimanna, C. ^[1]; Tachibana, Y. ^[2]; Majumder, A. ^[3]; Angerami, A. ^[4]; Arora, R. ^[3]; Bass, S. A. ^[5]; Chen, Y. ^[6]; Datta, R. ^[3]; Du, L. ^[7]; Ehlers, R. ^[8]; Elfner, H. ^[9]; Fries, R. J. ^[10]; Gale, C. ^[11]; He, Y. ^[12]; Jacak, B. V. ^[8]; Jacobs, P. M. ^[8]; Jeon, S. ^[11]; Ji, Y. ^[5]; Jonas, F. ^[8]; Kasper, L. ^[13] ; Kordell, M. ^[10]; Kumar, A. ^[14]; Kunnawalkam-Elayavalli, R. ^[13]; Latessa, J. ^[3]; Lee, Y.-J. ^[15]; Lemmon, R. ^[16]; Luzum, M. ^[17]; Mak, S. ^[5]; Mankolli, A. ^[13]; Martin, C. ^[18]; Mehryar, H. ^[3]; Mengel, T. ^[18]; Nattrass, C. ^[18]; Norman, J. ^[19]; Parker, C. ^[10]; Paquet, J.-F. ^[13]; Putschke, J. H. ^[3]; Roch, H. ^[3]; Roland, G. ^[15]; Schenke, B. ^[20]; Schwiebert, L. ^[3]; Sengupta, A. ^[10]; Shen, C. ^[21]; Singh, M. ^[13]; Soeder, D. ^[5]; Soltz, R. A. ^[22]; Soudi, I. ^[23]; Velkovska, J. ^[13]; Vujanovic, G. ^[24]; Wang, X.-N. ^[25]; Wu, X. ^[26]; Zhao, W. ^[27]

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1. Duke University; Wayne State University
2. Akita International University
3. Wayne State University
4. Lawrence Livermore National Laboratory
5. Duke University
6. Laboratory for Nuclear Science; Massachusetts Institute of Technology; Vanderbilt University
7. McGill University; University of California; Lawrence Berkeley National Laboratory
8. University of California; Lawrence Berkeley National Laboratory
9. GSI Helmholtzzentrum für Schwerionenforschung; Goethe University; Frankfurt Institute for Advanced Studies
10. Texas A&M University; Texas A&M University
11. McGill University
12. South China University of Technology
13. Vanderbilt University
14. University of Regina; McGill University
15. Laboratory for Nuclear Science; Massachusetts Institute of Technology
16. Daresbury, Warrington
17. Universidade de São Paulo
18. University of Tennessee
19. University of Liverpool
20. Brookhaven National Laboratory (BNL), Upton, NY (United States)
21. Wayne State University; Brookhaven National Laboratory
22. Wayne State University; Lawrence Livermore National Laboratory
23. Wayne State University; University of Jyväskylä; Helsinki Institute of Physics
24. University of Regina
25. Central China Normal University; University of California; Lawrence Berkeley National Laboratory
26. McGill University; Wayne State University
27. Wayne State University; University of California; Lawrence Berkeley National Laboratory

An investigation of high-transverse-momentum (high-𝑝_𝑇) photon-triggered jets in proton-proton (𝑝−𝑝) and ion-ion (𝐴−𝐴) collisions at $$\sqrt{s_{NN}}$$=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 (𝑅_𝐴⁢𝐴) for inclusive jets and high-𝑝𝑇 hadrons. We obtain a good reproduction of the experimental data for photon-triggered jet 𝑅_𝐴⁢𝐴, as measured by the ATLAS detector, the distribution of the ratio of jet to photon 𝑝_𝑇 (𝑋_𝐽⁢𝛾), 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 𝐼_𝐴⁢𝐴, 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 𝑋_𝐽⁢𝛾>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.

• Research Organization: Brookhaven National Laboratory (BNL), Upton, NY (United States)
• Sponsoring Organization: National Science Foundation (NSF); USDOE Office of Science (SC), Nuclear Physics (NP)
• Grant/Contract Number: AC02-05CH11231; AC52-07NA27344; FG02-05ER41367; FG02-92ER40713; SC0012704; SC0013460; SC0021969; SC0024232; SC0024347; SC0024660
• OSTI ID: 2572807
• Report Number(s): BNL--228460-2025-JAAM
• Journal Information: Physical Review. C, Journal Name: Physical Review. C Journal Issue: 6 Vol. 111; ISSN 2469-9985; ISSN 2469-9993
• Publisher: American Physical Society (APS)
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
jet quenching
photon
lepton
& quark production
quark-gluon plasma
relativistic heavy-ion collisions