Measurement of the Ratio of Branching Fractions <i>B</i>(<i>B_c</i><SUP>+</SUP> → <i>J</i>/ψτ<SUP>+</SUP>ν_τ)/<i>B</i>(<i>B_c</i><SUP>+</SUP> → <i>J</i>/ψμ<SUP>+</SUP>ν_μ)

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Aaij, R, Adeva, B, Adinolfi, M, Ajaltouni, Z, Akar, S, Albrecht, J, Alessio, F, Alexander, M, Alfonso Albero, A, Ali, S et al (show 790 more authors) , Alkhazov, G, Cartelle, P Alvarez, Alves, AA Jr, Amato, S, Amerio, S, Amhis, Y, An, L, Anderlini, L, Andreassi, G, Andreotti, M, Andrews, JE, Appleby, RB, Archilli, F, d'Argent, P, Romeu, J Arnau, Artamonov, A, Artuso, M, Aslanides, E, Atzeni, M, Auriemma, G, Baalouch, M, Babuschkin, I, Bachmann, S, Back, JJ, Badalov, A, Baesso, C, Baker, S, Balagura, V, Baldini, W, Baranov, A, Barlow, RJ, Barschel, C, Barsuk, S, Barter, W, Baryshnikov, F, Batozskaya, V, Battista, V, Bay, A, Beaucourt, L, Beddow, J, Bedeschi, F, Bediaga, I, Beiter, A, Bel, LJ, Beliy, N, Bellee, V, Belloli, N, Belous, K, Belyaev, I, Ben-Haim, E, Bencivenni, G, Benson, S, Beranek, S, Berezhnoy, A, Bernet, R, Berninghoff, D, Bertholet, E, Bertolin, A, Betancourt, C, Betti, F, Bettler, M-O, van Beuzekom, M, Bezshyiko, Ia, Bifani, S, Billoir, P, Birnkraut, A, Bizzeti, A, 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Whitehead, M, Wicht, J, Wilkinson, G, Wilkinson, M, Williams, M, Williams, MP, Williams, T, Wilson, FF, Wimberley, J, Winn, M, Wishahi, J, Wislicki, W, Witek, M, Wormser, G, Wotton, SA, Wraight, K, Wyllie, K, Xie, Y, Xu, M, Xu, Z, Yang, Z, Yang, Z, Yao, Y, Yin, H, Yu, J, Yuan, X, Yushchenko, O, Zarebski, KA, Zavertyaev, M, Zhang, L, Zhang, Y, Zhelezov, A, Zheng, Y, Zhu, X, Zhukov, V, Zonneveld, JB and Zucchelli, S (2018) Measurement of the Ratio of Branching Fractions <i>B</i>(<i>B_c</i><SUP>+</SUP> → <i>J</i>/ψτ<SUP>+</SUP>ν_τ)/<i>B</i>(<i>B_c</i><SUP>+</SUP> → <i>J</i>/ψμ<SUP>+</SUP>ν_μ). PHYSICAL REVIEW LETTERS, 120 (12). 121801-.

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Abstract

A measurement is reported of the ratio of branching fractions R(J/ψ)=B(B_{c}^{+}→J/ψτ^{+}ν_{τ})/B(B_{c}^{+}→J/ψμ^{+}ν_{μ}), where the τ^{+} lepton is identified in the decay mode τ^{+}→μ^{+}ν_{μ}ν[over ¯]_{τ}. 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 B_{c}^{+}→J/ψτ^{+}ν_{τ} 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.

Item Type:	Article
Additional Information:	All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2017-035.html
Uncontrolled Keywords:	LHCb Collaboration
Depositing User:	Symplectic Admin
Date Deposited:	08 May 2018 07:39
Last Modified:	14 Mar 2024 23:32
DOI:	10.1103/PhysRevLett.120.121801
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3020968