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Scientists have found the first evidence for an extremely rare particle decay known as ‘Bd to mu mu’.

Scientists have found the first evidence for an extremely rare particle decay known as ‘Bd to mu mu’.The decay is predicted to happen only once in around 10 billion beauty particles and has taken more than 40 years to find.The result has a statistical significance of 3.2 sigma, enough to constitute evidence, but not enough to claim the gold ...

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