After 42 Years of Searching, Physicists Find Evidence of a One-in-10-Billion Particle Decay

After 42 Years of Searching, Physicists Find Evidence of a One-in-10-Billion Particle Decay — Live Feedhttps://www.live-feeds.com/feed/after-42-years-of-searching-physicists-find-evidence-of-a-one-in-10-billion-particle-decayContinuously updated, source-cited coverage. CERN's LHCb finds first single-experiment evidence of ultra-rare beauty meson decayhttps://www.live-feeds.com/feed/after-42-years-of-searching-physicists-find-evidence-of-a-one-in-10-billion-particle-decayhttps://www.live-feeds.com/feed/after-42-years-of-searching-physicists-find-evidence-of-a-one-in-10-billion-particle-decay#u193284Wed, 11 Nov 2026 07:15:02 +0000The LHCb Collaboration at CERN announced evidence of a beauty meson decaying into two muons, a process predicted to occur roughly once in 10 billion decays. The result was presented in a seminar on November 3, 2026, and posted as a preprint on arXiv that has not yet been peer-reviewed. This marks the first single-experiment evidence for this decay channel after a search spanning more than 40 years. The upgraded LHCb detector, including UK-built components, enabled the sensitivity required to isolate the signal.Why it mattersThe decay of a beauty meson into two muons is a precision probe of the