Measurement of the lifetime of the Bc+ meson using the Bc+→J/ψπ+ decay mode
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Article history: Received 26 November 2014 Received in revised form 19 December 2014 Accepted 9 January 2015 Available online 13 January 2015 Editor: M. Doser The difference in total widths between the B+c and B+ mesons is measured using a data sample corresponding to an integrated luminosity of 3.0 fb−1 collected by the LHCb experiment in 7 and 8 TeV centre-of-mass energy proton–proton collisions at the LHC. Through the study of the time evolution of B+c → J/ψπ+ and B+ → J/ψK+ decays, the width difference is measured to be ≡ B+c − B+ = 4.46± 0.14± 0.07 mm−1 c, where the first uncertainty is statistical and the second systematic. The known lifetime of the B+ meson is used to convert this to a precise measurement of the B+c lifetime, τB+c = 513.4± 11.0± 5.7 fs,
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