Observation of the annihilation decay mode $B^0\to K^{+}{K}^{-}$

Abstract

A search for the $B^0\to K^{+}{K}^{-}$ decay is performed using $pp$-collision data collected by LHCb. The data set corresponds to integrated luminosities of 1 and 2 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 five standard deviations. The analysis also results in an improved measurement of the branching fraction for the $B_s^0\to {\pi }^{+}{\pi }^{-}$ decay. The measured branching fractions are $BR(B^0\to K^{+}{K}^{-})=(7.80\pm 1.27\pm 0.81\pm 0.21)\times 10^{-8}$ and $BR(B_s^0\to {\pi }^{+}{\pi }^{-})=(6.91\pm 0.54\pm 0.63\pm 0.19\pm 0.40)\times 10^{-7}$. The first uncertainty is statistical, the second is systematic, the third is due to the uncertainty on the $B^0\to K^{+}{\pi }^{-}$ branching fraction used as a normalization. For the $B_s^0$ mode, the fourth accounts for the uncertainty on the ratio of the probabilities for $b$ quarks to hadronize into $B_s^0$ and $B^0$ mesons.

arXiv commentAll figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2016-036.html

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