Measurement of the Bs → ϕϕ branching fraction and search for the decay → ϕϕ

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. AndersonG. Andreassi, M. Andreotti, J. E. Andrews, R. B. Appleby, O. Aquines Gutierrez, F. Archilli, P. d'Argent, A. Artamonov, M. Artuso, E. Aslanides, G. Auriemma, M. Baalouch, S. Bachmann, J. J. Back, L. Carson, P. E. L. Clarke, G. A. Cowan, D. C. Craik, S. Eisenhardt, D. Ferguson, S. Gambetta, Y. Gao, J. Harrison, H. Luo, A. B. Morris, F. Muheim, M. Needham, S. Playfer, I. T. Smith, Y. Xie, Y. Zhang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Using a dataset corresponding to an integrated luminosity of 3.0 fb−1 collected in pp collisions at centre-of-mass energies of 7 and 8 TeV, the Bs0 → ϕϕ branching fraction is measured to beB(B0s→ϕϕ)=(1.84±0.05(stat)±0.07(syst)±0.11(fs/fd)±0.12(norm))×10−5,B(Bs0→ϕϕ)=(1.84±0.05(stat)±0.07(syst)±0.11(fs/fd)±0.12(norm))×10−5,where fs/fd represents the ratio of the Bs0 to B0 production cross-sections, and the B0 → ϕK*(892)0 decay mode is used for normalization. This is the most precise measurement of this branching fraction to date, representing a factor five reduction in the statistical uncertainty compared with the previous best measurement. A search for the decay B0 → ϕϕ is also made. No signal is observed, and an upper limit on the branching fraction is set asB(B0→ϕϕ)<2.8×10−8B(B0→ϕϕ)<2.8×10−8at 90% confidence level. This is a factor of seven improvement compared to the previous best limit.
Original languageEnglish
Article number053
Number of pages18
JournalJournal of High Energy Physics
Volume10
Issue number10
DOIs
Publication statusPublished - 8 Oct 2015

Keywords

  • Hadron-Hadron Scattering
  • Branching fraction
  • B physics
  • Flavor physics
  • POLARIZATION
  • ASYMMETRIES

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