Observation of the B0s → η′η′ decay

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, S. Bifani, N. Farley, P. Griffith, P. Ilten, I. R. Kenyon, C. Lazzeroni, A. Mazurov, J. McCarthy, C. J. Parkinson, L. Pescatore, D. Popov, N. K. Watson

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Abstract

The first observation of the B0s → η′η′ decay is reported. The study is based on a sample of proton-proton collisions corresponding to 3.0 fb-1 of integrated luminosity collected with the LHCb detector. The significance of the signal is 6.4 standard deviations. The branching fraction is measured to be [3.31 ± 0.64 (stat) ± 0.28 (syst) ± 0.12 (norm)] × 10-5, where the third uncertainty comes from the B± → η′K± branching fraction that is used as a normalization. In addition, the charge asymmetries of B± → η′K± and B± → ϕK±, which are control channels, are measured to be (-0.2 ± 1.3)% and (+1.7 ± 1.3)%, respectively. All results are consistent with theoretical expectations.

Original languageEnglish
Article number051801
Number of pages9
JournalPhysical Review Letters
Volume115
Issue number5
DOIs
Publication statusPublished - 28 Jul 2015

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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