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Could anyone please tell me if the branching ratio of Ks -> mu mu been experimentally observed and noted? I looked at the PDG value, and I'm trying to find papers where I can find the source of the same.

Also, I'm not entirely sure if there has been an experiment to measure its value (I'm just assuming there is!), and maybe its just a calculated value.

If any one has any information about this branching ratio - papers, observed value, how to calculate its value - anything... it would really be appreciated!

Thank you in advance

Cheers,

Akshay