A joint measurement is presented of the branching fractions $B^0_s\to\mu^+\mu^-$ and $B^0\to\mu^+\mu^-$ in proton-proton collisions at the LHC by the CMS and LHCb experiments. The data samples were collected in 2011 at a centre-of-mass energy of 7 TeV, and in 2012 at 8 TeV. The combined analysis produces the first observation of the $B^0_s\to\mu^+\mu^-$ decay, with a statistical significance exceeding six standard deviations, and the best measurement of its branching fraction so far. Furthermore, evidence for the $B^0\to\mu^+\mu^-$ decay is obtained with a statistical significance of three standard deviations. The branching fraction measurements are statistically compatible with SM predictions and impose stringent constraints on several the...
The standard model of particle physics describes the fundamental particles and their interactions vi...
The standard model of particle physics describes the fundamental particles and their interactions vi...
The standard model of particle physics describes the fundamental particles and their interactions vi...
The standard model of particle physics describes the fundamental particles and their interactions vi...
The standard model of particle physics describes the fundamental particles and their interactions vi...
The standard model of particle physics describes the fundamental particles and their interactions vi...
A joint measurement is presented of the branching fractions $B^0_s\to\mu^+\mu^-$ and $B^0\to\mu^+\mu...
The standard model of particle physics describes the fundamental particles and their interactions vi...
The standard model of particle physics describes the fundamental particles and their interactions vi...
A joint measurement is presented of the branching fractions $B^0_s\to\mu^+\mu^-$ and $B^0\to\mu^+\m...
Results are presented from a search for the rare decays $B_s^0 \to \mu^+ \mu^-$ and $B^0 \to \mu^+...
The standard model of particle physics describes the fundamental particles and their interactions vi...
The standard model of particle physics describes the fundamental particles and their interactions vi...
The standard model of particle physics describes the fundamental particles and their interactions vi...
The standard model of particle physics describes the fundamental particles and their interactions vi...
The standard model of particle physics describes the fundamental particles and their interactions vi...
The standard model of particle physics describes the fundamental particles and their interactions vi...
A joint measurement is presented of the branching fractions $B^0_s\to\mu^+\mu^-$ and $B^0\to\mu^+\mu...
The standard model of particle physics describes the fundamental particles and their interactions vi...
The standard model of particle physics describes the fundamental particles and their interactions vi...
A joint measurement is presented of the branching fractions $B^0_s\to\mu^+\mu^-$ and $B^0\to\mu^+\m...
Results are presented from a search for the rare decays $B_s^0 \to \mu^+ \mu^-$ and $B^0 \to \mu^+...
The standard model of particle physics describes the fundamental particles and their interactions vi...
The standard model of particle physics describes the fundamental particles and their interactions vi...
The standard model of particle physics describes the fundamental particles and their interactions vi...