Transverse momentum balance of b-jet pairs in PbPb collisions with the CMS experiment at the LHC

Abstract : The collisions of heavy ions at high energy produce the new state of matter called the quark gluon plasma. A parton traversing the plasma loses its energy which results in the jet quenching phenomenon. The dependence of the jet quenchingonthepartonflavorprovidesconstraints the models describing energy loss. The imbalance of b-jets is a very suitable observable to study this phenomena. This dissertation presents the measurement of the transverse momentum imbalance of b-jets and inclusive (non-identified) jets in PbPb collisions at √sNN = 5.02 TeV which is performed with the CMS detector at the LHC with total integral luminosity of 404 µb−1. No significant difference in jet quenching between light and heavy flavor jets is observed. The interpretation of results with a simple model of energy loss is performed.
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Stanislav Lisniak. Transverse momentum balance of b-jet pairs in PbPb collisions with the CMS experiment at the LHC. High Energy Physics - Experiment [hep-ex]. Université Paris-Saclay, 2016. English. ⟨NNT : 2016SACLX069⟩. ⟨tel-01490097⟩

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