Measurement of the Ratio of Branching Fractions ℬ(Bc+→j/ψτ+ντ)/ℬ(Bc+→j/ψμ+νμ)

R. Aaij, B. Adeva, M. Adinolfi, Z. Ajaltouni, S. Akar, J. Albrecht, F. Alessio, M. Alexander, A. Alfonso Albero, S. Ali, G. Alkhazov, P. Alvarez Cartelle, A. A. Alves, S. Amato, S. Amerio, Y. Amhis, L. An, L. Anderlini, G. Andreassi, M. AndreottiJ. E. Andrews, R. B. Appleby, F. Archilli, P. D'Argent, J. Arnau Romeu, A. Artamonov, M. Artuso, E. Aslanides, M. Atzeni, G. Auriemma, M. Baalouch, I. Babuschkin, S. Bachmann, J. J. Back, A. Badalov, C. Baesso, S. Baker, V. Balagura, W. Baldini, S. Bifani, R. Calladine, G. Chatzikonstantinidis, N. Farley, C. Lazzeroni, A. Mazurov, A. Sergi, N. K. Watson, M. P. Williams, K. A. Zarebski, LHCb Collaboration, Timothy Williams

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Abstract

A measurement is reported of the ratio of branching fractions ℛ(J/ψ)=ℬ(Bc+→J/ψτ+ντ)/ℬ(Bc+→J/ψμ+νμ), where the τ+ lepton is identified in the decay mode τ+→μ+νμτ. This analysis uses a sample of proton-proton collision data corresponding to 3.0 fb-1 of integrated luminosity recorded with the LHCb experiment at center-of-mass energies of 7 and 8 TeV. A signal is found for the decay Bc+→J/ψτ+ντ at a significance of 3 standard deviations corrected for systematic uncertainty, and the ratio of the branching fractions is measured to be ℛ(J/ψ)=0.71±0.17(stat)±0.18(syst). This result lies within 2 standard deviations above the range of central values currently predicted by the standard model.

Original languageEnglish
Article number121801
Number of pages10
JournalPhysical Review Letters
Volume120
Issue number12
DOIs
Publication statusPublished - 23 Mar 2018

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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