Date of Award
5-2021
Document Type
Dissertation
Degree Name
Doctor of Philosophy (PhD)
Department
Aerospace, Physics, and Space Sciences
First Advisor
Marc Baarmand
Second Advisor
Ugur Abdulla
Third Advisor
Francisco Yumiceva
Fourth Advisor
Jean Carlos Perez
Abstract
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.
Recommended Citation
Saunders, Mark Douglas, "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" (2021). Theses and Dissertations. 485.
https://repository.fit.edu/etd/485