Abstract: A first measurement of the top quark mass in the decay channel t ? (W ? ??) (b ? J/? + X ? ?+?? + X) is presented. The analysis uses events selected from the proton-proton collisions recorded by the CMS detector at the LHC at a center-of-mass energy of 8 TeV. The data correspond to an integrated luminosity of 19.7 fb?1, with 666 tt¯tt¯ and single top quark candidate events containing a reconstructed J/? candidate decaying into an oppositely-charged muon pair. The mass of the (J/? + ?) system, where ? is an electron or a muon from W boson decay, is used to extract a top quark mass of 173.5 ± 3.0 (stat) ± 0.9 (syst) GeV.

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