# LHCb finds evidence for a one-in-10-billion B-meson decay

Source: [Physics World](https://physicsworld.com/a/lhcb-finds-evidence-for-a-one-in-10-billion-b-meson-decay/) · 2026-11-09 · Physics
Page: https://themorning.science/story/lhcb-finds-evidence-for-a-one-in-10-billion-b-meson-decay-80fa59d52a070f42
Kind: research · Impact: low

## In brief

- The LHCb collaboration reports evidence for a B-meson decay with a branching fraction of about one in ten billion.
- The measurement is reported by Physics World and is said to put constraints on physics beyond the Standard Model.

## Why it matters

Very rare decays are sensitive probes of new particles or forces that could appear in quantum loop effects, so tight measurements constrain beyond-Standard-Model theories.

## Timeline

- 2026-11-09: Physics World reports LHCb evidence for a one-in-10-billion B-meson decay

## Coverage

- [LHCb finds evidence for a one-in-10-billion B-meson decay](https://physicsworld.com/a/lhcb-finds-evidence-for-a-one-in-10-billion-b-meson-decay/) — Physics World, 2026-11-09

Tags: lhcb, b-meson, rare decays, flavour physics, standard model

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Brief generated by AI (claude-haiku-5-5) from the reporting listed under Coverage. Headlines belong to their publishers. The Morning Science – https://themorning.science