Date of Award


Document Type


Degree Name

Doctor of Philosophy (PhD)


Aerospace, Physics, and Space Sciences

First Advisor

Marc Baarmand

Second Advisor

Ugur Abdulla

Third Advisor

Francisco Yumiceva

Fourth Advisor

Jean Carlos Perez


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.

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