Determinación de la masa del quark top mediante el análisis del espectro de energía de b-jets con los datos del detector Solenoide Compacto de Muones (CMS)

Abstract

An alternative determination method of the mass of the top quark is presented, based only on the peak position of the energy spectrum of b-jets produced from top-quark decays. This novel technique follows a recent theoretical proposal aiming to minimize systematic uncertainties related to the modeling of top quark production. The analysis is performed selecting events with top-antitop production including an electron and a muon in the decay final state, in proton-proton collisions at √s = 8 TeV. The data was collected by the CMS experiment at the Large Hadron Collider, and corresponds to an integrated luminosity of 19.7 fb−1. The energy peak position is obtained by fitting the observed energy spectrum. Consequently, this observable is calibrated using Monte Carlo simulations, and translated to a top-quark mass estimation using relativistic kinematics. The measurement yields a value of = 172.29 ± 1.17 (statistics) ± 2.67(systematics) GeV.