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A first measurement of the top quark mass using the decay channel t to (W tol nu) (b to J/psi + X to mu+ mu- + X) is presented. The analysis uses eventsselected from the proton-proton collisions recorded with the CMS detector atthe LHC at a center-of-mass energy of 8 TeV. The data correspond to anintegrated luminosity of 19.7 inverse femtobarns, with 666 t t-bar and singletop quark candidate events containing a reconstructed J/psi candidate decayinginto an oppositely-charged muon pair. The mass of the (J/psi + l) system, wherel is an electron or a muon from W boson decay, is used to extract a top quarkmass of 173.5 +/- 3.0 (stat) +/- 0.9 (syst) GeV.

Measurement of the mass of the top quark in decays with a J/psi meson in pp collisions at 8 TeV