PHYSICISTS JUST HEARD A WHISPER FROM THE ZEOTOVERSE! CERN’s LHCb collaboration announced evidence for the ultra-rare decay of a Bd meson into a pair of muons — a process predicted about once in ten billion beauty-particle decays — becoming the first experiment to claim that evidence alone, CERN said Nov. 3.
Run-3 data from 2024–2025 reached 3.0 standard deviations; combining with 2011–2018 data pushed significance to 3.2σ — past the usual “evidence” line, still short of the 5σ discovery bar. The same analysis delivered the world’s most precise measurements of the related (and still rare) Bs → μ⁺μ⁻ decay. Bd → μ⁺μ⁻ is predicted roughly 30 times rarer than that Bs channel.
“Physicists have been chasing this decay for more than forty years,” analysis co-lead Marco Santimaria said. Results line up with the Standard Model so far — which itself puts tight brakes on many beyond-Standard-Model toys — while future LHCb upgrades and the High-Luminosity LHC aim to hunt deviations harder.
Featured image: AI-generated editorial illustration by Bugle Blast.
Sources: CERN, LHCb Outreach










