Measurement of the top quark mass using leptonic observables in tt events produced in pp collisions at sqrt s = 13 TeV with the CMS Experiment at the LHC
Saunders, Mark Douglas
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A novel method is presented for the measurement of the top-quark mass using only leptonic observables in tt events produced in pp collisions at SQRT(s)= 13 TeV.Data, corresponding to an integrated luminosity of 35.9 fb−1, were collected with the CMS detector during LHC Run II in 2016. The measurement uses the top-quark mass dependence of multiple kinematic distributions comprised from the dilepton eμ final state of tt events. The top-quark mass dependence of each kinematic distribution is calibrated using events generated with a NLO Monte Carlo simulation, and for the first time, with a second simulation that includes the exact NNLO corrections to the top quark decay subprocesses. A profile likelihood scan is utilized to simultaneously compare the shape of predicted and measured kinematic distributions and extract the value of the top-quark mass from the reconstructed leptonic observables. A second method uses the top-quark mass dependence of first and second Mellin moments of the kinematic distributions to obtain an alternative determination of the top-quark mass.