Research Papers in Physics and Astronomy


Date of this Version



Eur. Phys. J. C (2017) 77:354


© CERN for the benefit of the CMS collaboration 2017.

Open access

DOI 10.1140/epjc/s10052-017-4912-8


A measurement of the top quark mass is reported in events containing a single top quark produced via the electroweak t channel. The analysis is performed using data from proton-proton collisions collected with the CMS detector at the LHC at a centre-of-mass energy of 8TeV, corresponding to an integrated luminosity of 19.7 fb−1. Top quark candidates are reconstructed from their decay to a W boson and a b quark, with theWboson decaying leptonically to a muon and a neutrino. The final state signature and kinematic properties of single top quark events in the t channel are used to enhance the purity of the sample, suppressing the contribution from top quark pair production. Afit to the invariant mass distribution of reconstructed top quark candidates yields a value of the top quark mass of 172.95 ± 0.77 (stat)+0.97−0.93 (syst)GeV. This result is in agreement with the current world average, and represents the first measurement of the top quark mass in event topologies not dominated by top quark pair production, therefore contributing to future averages with partially uncorrelated systematic uncertainties and a largely uncorrelated statistical uncertainty.