All articles tagged with #b mesons
CERN’s LHCb reports a four-sigma deviation from Standard Model predictions in a rare penguin decay of B mesons to a kaon, a pion and two muons, suggesting possible undiscovered physics. The independent CMS results earlier in 2025 strengthen the case, but five-sigma confirmation is not yet reached; future LHC upgrades and larger datasets are planned to verify or refute the deviation.
New results from CERN’s LHCb show a rare electroweak penguin decay of B mesons that disagrees with Standard Model predictions at about four standard deviations, hinting at possible new physics. The finding is supported by earlier CMS results and comes from analyzing roughly 650 billion B decays (2011–2018). Although intriguing, it does not reach the five-sigma discovery threshold; further data and upgrades planned for the 2030s could confirm whether this points to new particles or remains a heavy overlap within the current theory.