Abstract
We present measurements of the azimuthal dependence of charged jet production in central and semi-central sNN=2.76 TeV Pb–Pb collisions with respect to the second harmonic event plane, quantified as v2ch jet. Jet finding is performed employing the anti-kT algorithm with a resolution parameter R=0.2 using charged tracks from the ALICE tracking system. The contribution of the azimuthal anisotropy of the underlying event is taken into account event-by-event. The remaining (statistical) region-to-region fluctuations are removed on an ensemble basis by unfolding the jet spectra for different event plane orientations independently. Significant non-zero v2ch jet is observed in semi-central collisions (30–50% centrality) for 20<pTch jet<90 GeV/c. The azimuthal dependence of the charged jet production is similar to the dependence observed for jets comprising both charged and neutral fragments, and compatible with measurements of the v2 of single charged particles at high pT. Good agreement between the data and predictions from JEWEL, an event generator simulating parton shower evolution in the presence of a dense QCD medium, is found in semi-central collisions.
Highlights
The aim of the heavy-ion program at the LHC is to study strongly interacting matter in ultra-relativistic nuclear collisions where the formation of a quark–gluon plasma (QGP), a deconfined state of quarks and gluons, is expected [1]
The results presented in this paper extend the v ch 2 jet measurement to a lower particle spectrum and σ (pT)
The observed behavior is indicative of path-length-dependent in-medium parton energy loss
Summary
The aim of the heavy-ion program at the LHC is to study strongly interacting matter in ultra-relativistic nuclear collisions where the formation of a quark–gluon plasma (QGP), a deconfined state of quarks and gluons, is expected [1]. Studies at the LHC and RHIC have shown that jet and high-pT single particle production in heavy-ion collisions are suppressed with respect to the expected production in a superposition of independent pp collisions [4,5,6,7,8,9,10,11,12,13]. This observation is consistent with energy loss, which is further supported by measurements of dijet energy asymmetry and di-hadron angular correlations [14,15,16]. The dependence of jet production on the angle relative to the second-harmonic symmetry plane
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