Measurement of transverse momentum relative to dijet systems in PbPb and pp collisions at √sNN = 2.76 TeV

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Date
2016-01-04Author
Khachatryan, Vardan
Sirunyan, A.M.
Baarmand, Marc M.
Bhopatkar, Vallary
Colafranceschi, Stefano
Hohlmann, Marcus
Kalakhety, Himali
Noonan, Daniel
Roy, Tuhin S.
Yumiceva, Francisco
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Show full item recordAbstract
An analysis of dijet events in PbPb and pp collisions is performed to explore the
properties of energy loss by partons traveling in a quark-gluon plasma. Data are collected
at a nucleon-nucleon center-of-mass energy of 2.76 TeV at the LHC. The distribution of
transverse momentum (pT) surrounding dijet systems is measured by selecting charged
particles in different ranges of pT and at different angular cones of pseudorapidity and
azimuth. The measurement is performed as a function of centrality of the PbPb collisions,
the pT asymmetry of the jets in the dijet pair, and the distance parameter R used in the
anti-kT jet clustering algorithm. In events with unbalanced dijets, PbPb collisions show
an enhanced multiplicity in the hemisphere of the subleading jet, with the pT imbalance
compensated by an excess of low-pT particles at large angles from the jet axes.