Combined time-integrated CP asymmetry A_CP and B(K_S to mu mu) measurements, using known B(K_L to mu mu) and B(K_L to gamma gamma), extract the short-distance amplitude |A^2 lambda^5 eta-bar| and resolve the discrete ambiguity in the SM prediction for B(K_L to mu mu).
This is equivalent to assuming no scalar operators are at play, and is fulfilled within the SM to O(m2 K/m2 W ) ∼ 10−5 [22]
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CP violation in $K\to\mu^+\mu^-$ with and without time dependence through a tagged analysis
Combined time-integrated CP asymmetry A_CP and B(K_S to mu mu) measurements, using known B(K_L to mu mu) and B(K_L to gamma gamma), extract the short-distance amplitude |A^2 lambda^5 eta-bar| and resolve the discrete ambiguity in the SM prediction for B(K_L to mu mu).