Search for Quasiparticle Scattering in the Quark-Gluon Plasma with Jet Splittings in 𝑝𝑝 and Pb-Pb Collisions at $$\sqrt{s_{NN}}$$ = 5.02 TeV
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· Physical Review Letters
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- Université Clermont Auvergne
- Homi Bhabha National Institute
- European Organization for Nuclear Research (CERN)
- Dipartimento di Fisica dell’Università and Sezione INFN
- Dipartimento DISAT del Politecnico and Sezione INFN
- Dipartimento di Fisica e Astronomia dell’Università and Sezione INFN
- Aligarh Muslim University
- Korea Institute of Science and Technology Information
- P.J. Šafárik University
- CERN
- Johann Wolfgang Goethe-Universität Frankfurt
- Research Division and ExtreMe Matter Institute EMMI
- INFN
- Central China Normal University
- Universidad Nacional Autónoma de México
- University of Houston
- Sungkyunkwan University
- University of Bergen
- Dipartimento di Fisica dell’Università and Sezione INFN; INFN
- Technische Universität München
- Universidad Autónoma de Puebla
- Horia Hulubei National Institute of Physics and Nuclear Engineering
- University of Derby
- Universität Münster
- Ruprecht-Karls-Universität Heidelberg
- Lawrence Berkeley National Laboratory
- Nantes Université
- Université Grenoble-Alpes
- Universidade de São Paulo (USP)
- University of Oslo
- Yale University
- University of Tokyo
- Gangneung-Wonju National University
- University of Science and Technology of China
- Indian Institute of Technology
- University of Jammu
- Université Paris-Saclay
- AGH University of Krakow
- Dipartimento Interateneo di Fisica ‘M. Merlin’ and Sezione INFN
- National and Kapodistrian University of Athens
- Gauhati University
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- Central China Normal University; Ruprecht-Karls-Universität Heidelberg
- Central China Normal University; Université Clermont Auvergne
- Central China Normal University; INFN
The ALICE Collaboration reports measurements of the large relative transverse momentum (𝑘𝑇) component of jet substructure in 𝑝𝑝 and Pb-Pb collisions at center-of-mass energy per nucleon pair $$\sqrt{s_{NN}}$$ = 5.02 TeV. Enhancement in the yield of such large-𝑘T emissions in head-on Pb-Pb collisions is predicted to arise from partonic scattering with quasiparticles of the quark-gluon plasma. The analysis utilizes charged-particle jets reconstructed by the anti-𝑘T algorithm with resolution parameter 𝑅 = 0.2 in the transverse-momentum interval 60 < 𝑝T,ch,jet < 80 GeV/𝑐. The soft drop and dynamical grooming algorithms are used to identify high transverse momentum splittings in the jet shower. Comparison of measurements in Pb-Pb and 𝑝𝑝 collisions shows medium-induced narrowing, corresponding to yield suppression of high-𝑘𝑇 splittings, in contrast to the expectation of yield enhancement due to quasiparticle scattering. The measurements are compared to theoretical model calculations incorporating jet modification due to jet-medium interactions (“jet quenching”), both with and without quasiparticle scattering effects. These measurements provide new insight into the underlying mechanisms and theoretical modeling of jet quenching.
- Research Organization:
- European Organization for Nuclear Research (CERN), Geneva (Switzerland); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Yale University, New Haven, CT (United States)
- Sponsoring Organization:
- Academy of Finland; Czech Science Foundation; European Research Council; US Department of Energy; USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25); USDOE Office of Science (SC), Nuclear Physics (NP)
- Contributing Organization:
- ALICE Collaboration
- Grant/Contract Number:
- AC02-05CH11231; SC0004168
- Other Award/Contract Number:
- 23-07499S
346327
346328
PMU-B B05F650021
950692
- OSTI ID:
- 3011796
- Alternate ID(s):
- OSTI ID: 3007104
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 3 Vol. 135; ISSN 1079-7114; ISSN 0031-9007
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English