In an article published today in Nature, the CMS and LHCb collaborations describe the first observation of the very rare decay of the B0s particle into two muon particles. The Standard Model, the theory that best describes the world of particles, predicts that this rare subatomic process happens about four times out of a billion decays, but it has never been seen before. These decays are studied as they could open a window to theories beyond the Standard Model, such as supersymmetry. The analysis is based on data taken at the Large Hadron Collider (LHC) in 2011 and 2012. These data also contain early hints of a similar, but even more rare decay into two muons of the B0, a cousin of the B0s.
The B0s and B0 are mesons, in other words, non-elementary unstable subatomic particles composed of a quark and an antiquark1, bound together by the strong interaction. Such particles are produced only in high-energy collisions – at particle accelerators, or in nature, for example in cosmic-ray interactions.
Washington, 7 May 2015. A new agreement between the United States and the European Organization for Nuclear Research (CERN1) signed today will pave the way for renewed collaboration in particle physics, promising to yield new insights...
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