Long vs. short distance dispersive two-photon KL μ+ μ- amplitude
J. O. Eeg, K. Kumericki, I. Picek
Abstract
We report on the calculation of the two-loop electroweak, two-photon mediated short-distance dispersive KL μ+μ- decay amplitude. QCD corrections change the sign of this contribution and reduce it by an order of magnitude. The resulting amplitude enables us to provide a constraint on the otherwise uncertain long-distance dispersive amplitude.
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