Measurement of the Top Quark Mass Using Single Top Events

Single top quark production via t-channel is the most dominant production process at the LHC. This process provides a unique phase space with lower color reconnection probability as compared to $t\bar{t}$. The final state comprises a single top along with a light quark giving rise to at least two jets, one of which arises from the hadronization of b-quark, an isolated energetic lepton (electron or muon), and large missing transverse momentum due to an escaping neutrino from the W boson decay. The measurement is based on proton-proton collision data, equivalent to $35.9\,\textrm{fb}^{-1}$ integrated luminosity, recorded at $\sqrt{s} = 13$ TeV by the CMS [1] experiment during 2016 LHC operations. A multivariate technique based on boosted decision trees is deployed to optimally separate the signal from backgrounds. We obtain the top quark mass by fitting reconstructed top quark distribution using an appropriate combination of parametric shapes.