Measurement of the top quark mass in single top events at 13 TeV

	Precision measurement of top quark mass plays an important role in the Standard

	Model. We report a measurement of the top quark mass using the t-channel process, which is the dominant production mode for single top quark events at the LHC. This channel is especially useful due to its capability for reducing some of the dominant systematic uncertainties like color reconnection as compared to the top-quark pair production, which currently dominates the world average of top quark mass. Our study is based on the final state of at least two jets, one of which arises from a bottom quark, an isolated charged lepton (electron or muon), and large missing transverse momentum due to the neutrino that escapes the detector. The data sample was recorded in proton-proton collisions at 13 TeV by the CMS experiment during its 2016 runtaking period with an integrated luminosity 39.5 fb-1. The latest status of our measurement will be presented in this talk.