The decay LHCb found, Bd to mu mu, is predicted to happen about once in every 10 billion beauty particle decays.
Its sibling, Bs to mu mu, occurs roughly three times in a billion, so the new one is about 30 times rarer.
The decay LHCb found, Bd to mu mu, is predicted to happen about once in every 10 billion beauty particle decays. Its sibling, Bs to mu mu, occurs roughly three times in a billion, so the new one is about 30 times rarer.
