@article{4a68c8f297fd4da09a4c7f07a8c7e15e,

title = "Observation of the Annihilation Decay Mode B0 →k+K-",

abstract = "A search for the B0→K+K- decay is performed using pp-collision data collected by LHCb. The data set corresponds to integrated luminosities of 1.0 and 2.0 fb-1 at center-of-mass energies of 7 and 8 TeV, respectively. This decay is observed for the first time, with a significance of more than 5 standard deviations. The analysis also results in an improved measurement of the branching fraction for the Bs0→π+π- decay. The measured branching fractions are B(B0→K+K-)=(7.80±1.27±0.81±0.21)×10-8 and B(Bs0→π+π-)=(6.91±0.54±0.63±0.19±0.40)×10-7. The first uncertainty is statistical, the second is systematic, the third is due to the uncertainty on the B0→K+π- branching fraction used as a normalization. For the Bs0 mode, the fourth accounts for the uncertainty on the ratio of the probabilities for b quarks to hadronize into Bs0 and B0 mesons.",

author = "{(LHCb Collaboration)} and R. Aaij and B. Adeva and M. Adinolfi and Z. Ajaltouni and S. Akar and J. Albrecht and F. Alessio and M. Alexander and S. Ali and G. Alkhazov and {Alvarez Cartelle}, P. and Alves, {A. A.} and S. Amato and S. Amerio and Y. Amhis and L. An and L. Anderlini and G. Andreassi and M. Andreotti and Andrews, {J. E.} and Appleby, {R. B.} and F. Archilli and P. D'Argent and {Arnau Romeu}, J. and A. Artamonov and M. Artuso and E. Aslanides and G. Auriemma and M. Baalouch and I. Babuschkin and S. Bachmann and Back, {J. J.} and A. Badalov and C. Baesso and S. Baker and W. Baldini and Barlow, {R. J.} and C. Barschel and S. Barsuk and W. Barter and M. Baszczyk and V. Batozskaya and B. Batsukh and V. Battista and A. Bay and L. Beaucourt and S. Blusk and Rudolph, {M. S.} and T. Skwarnicki and S. Stone",

note = "Publisher Copyright: {\textcopyright} 2017 CERN. Copyright: Copyright 2019 Elsevier B.V., All rights reserved.",

year = "2017",

month = feb,

day = "21",

doi = "10.1103/PhysRevLett.118.081801",

language = "English (US)",

volume = "118",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "8",

}