Measurement of the lifetime of the B+c meson using the B+c→J/ψπ+ decay mode

LHCb Collaboration, R. Aaij, B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, S. Akar, J. Albrecht, F. Alessio, M. Alexander, S. Ali, G. Alkhazov, P. Alvarez Cartelle, A. A. Alves, S. Amato, S. Amerio, Y. Amhis, L. An, L. Anderlini, J. AndersonR. Andreassen, M. Andreotti, J. E. Andrews, R. B. Appleby, O. Aquines Gutierrez, F. Archilli, A. Artamonov, M. Artuso, E. Aslanides, G. Auriemma, M. Baalouch, S. Bachmann, J. J. Back, A. Badalov, C. Baesso, W. Baldini, R. J. Barlow, C. Barschel, S. Barsuk, W. Barter, V. Batozskaya, S. Bifani, N. Farley, P. Griffith, I. R. Kenyon, C. Lazzeroni, A. Mazurov, J. McCarthy, C. J. Parkinson, L. Pescatore, N. K. Watson

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Abstract

The difference in total widths between the B+c and Bmesons 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/ψKdecays, the width difference is measured to be ΔΓ≡ΓB+cB+=4.46±0.14±0.07mm-1c, where the first uncertainty is statistical and the second systematic. The known lifetime of the Bmeson is used to convert this to a precise measurement of the B+lifetime, τB+c=513.4±11.0±5.7fs, where the first uncertainty is statistical and the second is systematic.

Original languageEnglish
Pages (from-to)29-37
Number of pages9
JournalPhysics Letters B
Volume742
Early online date13 Jan 2015
DOIs
Publication statusPublished - 6 Mar 2015

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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