Observation of the rare B-s(0)->mu(+)mu(-) decay from the combined analysis of CMS and LHCb data

The standard model of particle physics describes the fundamental particles and their interactions via the strong, electromagnetic and weak forces. It provides precise predictions for measurable quanti- ties that can be tested experimentally. The probabilities, or branch- ing fractions, of the strange B meson (Bs0 ) and the B0 meson decaying into two oppositely charged muons (m1 and m2) are especially inter- esting because of their sensitivity to theories that extend the standard model. The standard model predicts that the Bs0?m1m2 and B0?m1m2 decays are very rare, with about four of the former occur- ring for every billion Bs0 mesons produced, and one of the latter occurring for every ten billion B0 mesons1. A difference in the observed branching fractions with respect to the predictions of the standard model would provide a direction in which the standard model should be extended. Before the Large Hadron Collider (LHC) at CERN2 started operating, no evidence for either decay mode had been found. Upper limits on the branching fractions were an order of magnitude above the standard model predictions. The CMS (Compact Muon Solenoid) and LHCb (Large Hadron Collider beauty) collaborations have performed a joint analysis of the data from proton–proton collisions that they collected in 2011 at a centre-of- mass energy of seven teraelectronvolts and in 2012 at eight teraelec- tronvolts. Here we report the first observation of the Bs0 ? m1m2 decay, with a statistical significance exceeding six standard deviations, and the best measurement so far of its branching fraction. Furthermore, we obtained evidence for the B0? m1m2 decay with a statistical significance of three standard deviations. Both mea- surements are statistically compatible with standard model predic- tions and allow stringent constraints to be placed on theories beyond the standard model. The LHC experiments will resume taking data in 2015, recording proton–proton collisions at a centre-of-mass energy of 13 teraelectronvolts, which will approximately double the produc- tion rates of Bs0 and B0 mesons and lead to further improvements in the precision of these crucial tests of the standard model.