Münster 2017 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 20: Heavy Ion Collisions and QCD Phases IV

HK 20.4: Talk

Tuesday, March 28, 2017, 15:00–15:15, F 1

Recent measurements of jet substructure in Pb-Pb collisions at ALICE — •Leticia Cunqueiro for the ALICE collaboration — University of Muenster

We report recent measurements of jet substructure in Heavy Ion Collisions at ALICE. Those measurements are the jet mass, the ratio of 2-Subjettiness to 1-Subjettiness calculated with respect the two subjet axes given by kT in exclusive mode as well as the aperture angle between these axes. These observables probe different aspects of the jet evolution in the presence of a Quark Gluon Plasma: while the mass probes possible broadening/collimation of the jet shower, the Subjettiness measurements are used to investigate the role of coherence. Coherence effects relate to the ability of the medium to resolve a jet*s substructure, which has an impact on the energy loss magnitude and mechanism of the traversing jet. New techniques are used to subtract background, to suppress combinatorial jets and to unfold simultaneously the shape and the jet pT to provide fully corrected measurements in central Pb-Pb collisions at sqrtsNN =2.76 TeV