2026-10-19T01:08:39Zhttps://ebyu-rdlopen.rawdatalibrary.net/oai/request

oai:ebyu-rdlopen.rawdatalibrary.net:ebyu/142962026-10-18T20:29:06Zopenairedrivercom_ebyu_10000col_ebyu_10001

Observation of Medium-Induced Modifications of Jet Fragmentation in Pb-Pb Collisions at sNN =5.02 TeV Using Isolated Photon-Tagged JetsSirunyan, A.M.Tumasyan, A.Adam, W.Ambrogi, F.Asilar, E.Bergauer, T.Brandstetter, J.Brondolin, E.Dragicevic, M.Erö, J.Escalante Del Valle, A.Flechl, M.Friedl, M.Frühwirth, R.Ghete, V.M.Grossmann, J.Hrubec, J.Jeitler, M.König, A.Krammer, N.Krätschmer, I.Liko, D.Madlener, T.Mikulec, I.Pree, E.Rad, N.Rohringer, H.Schieck, J.Schöfbeck, R.Spanring, M.Spitzbart, D.Taurok, A.Waltenberger, W.Wittmann, J.Wulz, C.-E.Zarucki, M.Chekhovsky, V.Mossolov, V.Suarez Gonzalez, J.De Wolf, E.A.Di Croce, D.Janssen, X.Lauwers, J.Van De Klundert, M.Van Haevermaet, H.Van Mechelen, P.Van Remortel, N.Abu Zeid, S.Blekman, F.D'Hondt, J.Atomic beamsColliding beam acceleratorsCollisional plasmasHadronsKinematicsLead alloysNegative ionsPositive ionsCenter-of-mass energiesCentre-of-mass energiesCMS detectorsFragmentation functionsIsolated photonsJet fragmentationMeasurements ofNucleon-nucleonPb-Pb collisionsTransverse momentaPhotonsMeasurements of fragmentation functions for jets associated with an isolated photon are presented for the first time in pp and Pb-Pb collisions. The analysis uses data collected with the CMS detector at the CERN LHC at a nucleon-nucleon center-of-mass energy of 5.02 TeV. Fragmentation functions are obtained for jets with pTjet>30 GeV/c in events containing an isolated photon with pTγ>60 GeV/c, using charged tracks with transverse momentum pTtrk>1 GeV/c in a cone around the jet axis. The association with an isolated photon constrains the initial pT and azimuthal angle of the parton whose shower produced the jet. For central Pb-Pb collisions, modifications of the jet fragmentation functions are observed when compared to those measured in pp collisions, while no significant differences are found in the 50% most peripheral collisions. Jets in central Pb-Pb events show an excess (depletion) of low (high) pT particles, with a transition around 3 GeV/c. This measurement shows for the first time the in-medium shower modifications of partons (quark dominated) with well-defined initial kinematics. It constitutes a new well-controlled reference for testing theoretical models of the parton passage through the quark-gluon plasma. .American Physical Society2018Articlehttps://rdlopen.rawdatalibrary.net/r/ebyu/14296https://doi.org/10.1103/physrevlett.121.2423010031-9007enPhysical Review Lettersinfo:eu-repo/semantics/openAccessinfo:eu-repo/semantics/articlehttps://ebyu-rdlopen.rawdatalibrary.net/tr/items/ebyu/14296