LHCb observes rare decay

Standard Model predictions align with the LHCb experiment's observation of an uncommon decay. The Standard Model is holding strong after a new precision measurement of a rare subatomic process. For the first time, the LHCb experiment at CERN has independently observed the decay of the Bs0 particle--a heavy composite particle consisting of a bottom antiquark and a strange quark--into two muons. The LHCb experiment co-discovered this rare process in 2015 after combining results with the CMS experi...