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

Abstract : A first measurement is presented of the top quark mass using the decay channel t to (W to l nu) (b to J/psi+X to mu+mu- + X), in events selected in proton-proton collisions and recorded with the CMS detector at the LHC at a center-of-mass energy of 8TeV. The data correspond to an integrated luminosity of 19.7 inverse femtobarns, with 666 ttbar and single top quark candidate events containing a reconstructed J/psi candidate decaying into an oppositely-charged muon pair. The mass of the (J/psi+l) system, where l 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.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-01353566
Contributor : Dominique Girod <>
Submitted on : Friday, August 12, 2016 - 10:22:11 AM
Last modification on : Wednesday, November 25, 2020 - 4:10:43 PM

### Citation

V. Khachatryan, M. Besancon, F. Couderc, M. Dejardin, D. Denegri, et al.. Measurement of the mass of the top quark in decays with a J/psi meson in pp collisions at 8 TeV. Journal of High Energy Physics, Springer Verlag (Germany), 2016, 12, pp.123. ⟨10.1007/JHEP12(2016)123⟩. ⟨in2p3-01353566⟩

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