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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-1collected 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 ΔΓ≡ΓB+c-ΓB+=4.46±0.14±0.07mm-1c, 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±5.7fs, where the first uncertainty is statistical and the second is systematic.
ASJC Scopus subject areas
- Nuclear and High Energy Physics
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