Decomposing transverse momentum balance contributions for quenched jets in PbPb collisions at √sNN=2.76 TeV

Khachatryan, V. and Sirunyan, A.M. and Tumasyan, A. and Adam, W. and Asilar, E. and Filipovic, Nicolas and Bencze, György and Hajdú, Csaba and Hidas, Pál and Horváth, Dezső and Siklér, Ferenc and Veszprémi, Viktor and Vesztergombi, György and Zsigmond, Anna Júlia and Makovec, Alajos and Molnár, József and Bartók, Márton and Trócsányi, Zoltán and Ujvári, Balázs and Veres, Gábor (2016) Decomposing transverse momentum balance contributions for quenched jets in PbPb collisions at √sNN=2.76 TeV. JOURNAL OF HIGH ENERGY PHYSICS, 2016 (11). ISSN 1126-6708

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Abstract

Interactions between jets and the quark-gluon plasma produced in heavy ion colli- sions are studied via the angular distributions of summed charged-particle transverse momenta (pT) with respect to both the leading and subleading jet axes in high-pT dijet events. The contributions of charged particles in different momentum ranges to the overall event pT balance are decomposed into short-range jet peaks and a long-range azimuthal asymmetry in charged-particle pT. The results for PbPb collisions are com- pared to those in pp collisions using data collected in 2011 and 2013, at collision en- ergy √sNN = 2.76 TeV with integrated luminosities of 166 μb−1 and 5.3 pb−1, respec- tively, by the CMS experiment at the LHC. Measurements are presented as functions of PbPb collision centrality, charged-particle pT, relative azimuth, and radial distance from the jet axis for balanced and unbalanced dijets.

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