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Measurement of the top quark mass in the dileptonic t¯t decay channel using the mass observables Mb?, MT2, and Mb?? in pp collisions at ?s=8??TeV

Abstract: A measurement of the top quark mass (Mt) in the dileptonic t¯t decay channel is performed using data from proton-proton collisions at a center-of-mass energy of 8 TeV. The data was recorded by the CMS experiment at the LHC and corresponds to an integrated luminosity of 19.7±0.5??fb?1. Events are selected with two oppositely charged leptons (?=e, ?) and two jets identified as originating from bquarks. The analysis is based on three kinematic observables whose distributions are sensitive to the value of Mt. An invariant mass observable, Mb?, and a ?stransverse mass? observable, MT2, are employed in a simultaneous fit to determine the value of Mt and an overall jet energy scale factor (JSF). A complementary approach is used to construct an invariant mass observable, Mb??, that is combined with MT2 to measure Mt. The shapes of the observables, along with their evolutions in Mtand JSF, are modeled by a nonparametric Gaussian process regression technique. The sensitivity of the observables to the value of Mt is investigated using a Fisher information density method. The top quark mass is measured to be 172.22±0.18(stat)?+0.89?0.93(syst)??GeV.

 Fuente: Physical Review D. Vol. 96, Iss. 03, Art. Num. 032002

 Editorial: American Physical Society

 Fecha de publicación: 01/08/2017

 Nº de páginas: 31

 Tipo de publicación: Artículo de Revista

 DOI: 10.1103/PhysRevD.96.032002

 ISSN: 1550-7998,1550-2368,2470-0010,2470-0029

 Url de la publicación: https://doi.org/10.1103/PhysRevD.96.032002