Observation of Medium-Induced Modifications of Jet Fragmentation in Pb-Pb Collisions at √sNN=5.02 TeV Using Isolated Photon-Tagged Jets (CROSBI ID 267044)
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Podaci o odgovornosti
Sirunyan, Albert ; ... ; Đurić, Senka ; Lelas, Damir ; Godinović, Nikola ; Puljak, Ivica ; Šćulac, Toni ; Mesić, Benjamin ; Šuša, Tatjana ; Kovač, Marko ; Ferenček, Dinko ; Antunović, Željko ; Starodumov, Andrey ; Brigljević, Vuko ; Luetić, Jelena ; Kadija, Krešo ; ... ; Woods, Nate
CMS Collaboration
engleski
Observation of Medium-Induced Modifications of Jet Fragmentation in Pb-Pb Collisions at √sNN=5.02 TeV Using Isolated Photon-Tagged Jets
Measurements 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 pjetT>30 GeV/c in events containing an isolated photon with pγT>60 GeV/c, using charged tracks with transverse momentum ptrkT>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.
high energy physics ; experimental particle physics ; LHC ; CMS ; standard model
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Podaci o izdanju
121
2018.
242301
18
objavljeno
0031-9007
1079-7114
10.1103/PhysRevLett.121.242301