Journal Article

Observation of the decayB_(s)⁰ → η_(c) φand evidence forB_(s)⁰ → η_(c) π⁺ π

Blouw, J., Blusk, S., Blake, T., Britton, T., Braun, S., Barsuk, S., Baszczyk, M., Alexander, M., Ajaltouni, Z., Aaij, R., Anderlini, L., Bordyuzhin, I., Andreassi, G., Burr, C., Balagura, V., Barlow, R. J., Boettcher, T., Alkhazov, G., Battista, V., Baesso, C., Bedeschi, F., Belous, K., Alves Jr, A. A., Baker, S., Birnkraut, A., Bonivento, W., Adeva, B., Baryshnikov, F., Bencivenni, G., Bettler, M. -O., Buchanan, E., Bondar, N., Bifani, S., Badalov, A., Bozzi, C., Barter, W., Blanc, F., Adinolfi, M., Aslanides, E., Bowcock, T. J. V., Borisyak, M., Andreotti, M., Betti, F., Akar, S., Bezshyiko, Ia, Albrecht, J., Billoir, P., Babuschkin, I., Amhis, Y., Back, J. J., Belloli, N., Bel, L. J., Belyaev, I., Beaucourt, L., Bellee, V., Baldini, W., Barschel, C., Amerio, S., Berezhnoy, A., Borgheresi, A., Bocci, V., Bowen, E., Bachmann, S., Brodzicka, J., Artuso, M., Bernet, R., Borsato, M., An, L., Ali, S., Auriemma, G., Artamonov, A., Boubdir, M., Archilli, F., Appleby, R. B., Beddow, J., Bediaga, I., Bird, T., d'Argent, P., Batozskaya, V., Batsukh, B., Borghi, S., Baalouch, M., Betancourt, C., van Beuzekom, M., Bossu, F., Andrews, J. E., Bitadze, A., Benson, S., A

2017

Overview

A study ofB⁰_(s) → η_(c) φandB⁰_(s) → η_(c) π⁺π⁻decays is performed usingppcollision data corresponding to an integrated luminosity of 3.0 \\rm fb⁻¹ , collected with the LHCb detector in Run 1 of the LHC. The observation of the decayB⁰_(s) → η_(c) φis reported, where theη_(c)meson is reconstructed in thepp̄ ,K⁺K⁻π⁺π⁻ ,π⁺π⁻π⁺π⁻andK⁺K⁻K⁺K⁻decay modes and theφ(1020)in theK⁺ K⁻decay mode. The decayB⁰_(s) → J/ψ φis used as a normalisation channel. Evidence is also reported for the decayB⁰_(s) → η_(c) π⁺π⁻ , where theη_(c)meson is reconstructed in thepp̄decay mode, using the decayB⁰_(s) → J/ψ π⁺ π⁻as a normalisation channel. The measured branching fractions are eqnarray* B (B⁰_(s) _(c) ) &=& (5.01 0.53 0.27 0.63 ) 10⁻4 , B (B⁰_(s) _(c) ⁺ ⁻) &=& (1.76 0.59 0.12 0.29 ) 10⁻4 , eqnarray* where in each case the first uncertainty is statistical, the second systematic and the third uncertainty is due to the limited knowledge of the external branching fractions.

• Publisher: Springer
• Subject: High Energy Physics - Experiment / Physics