Researchers measure rare particledecay with high precision
One such process is the rare decay of neutral B mesons to a muon and antimuon pair: the heavier cousin of the electron paired with its corresponding antiparticle. There are two types of neutral B mesons: The Bmeson the down quark is replaced by a strange quark. If there are no new particles affecting these rare decays, researchers have predicted that only one in 250 million Bmeson, the process is even more rare, at only one in 10 billion.
Scientists have been searching for experimental confirmation of these decays since the 1980s. Only recently, in 2014, was the first observation of the Bto muons decay reported in a combined analysis of data taken by the LHCb and CMS collaborations, later confirmed by the ATLAS, CMS and LHCb experiments individually. However, the BUsing data from Run 2 of the LHC, the CMS experiment has released a new study of the decay rate and the lifetime of the Bdecay.
France Dernières Nouvelles, France Actualités
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