Long vs. short distance dispersive two-photon K_L \to μ^+ μ^- amplitude

Details Long vs. short distance dispersive two-photon K_L \to μ^+ μ^- amplitude Long vs. short distance dispersive two-photon K_L \to μ^+ μ^- amplitude

1999-01-21

arxiv.org/abs/hep-ph/9901372v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, 2 figures, presented by K.K. on the conference "Nuclear and Particle Physics with CEBAF", Dubrovnik, Croatia, Nov 3-1

Scientific paper

We report on the calculation of the two-loop electroweak, two-photon mediated
short-distance dispersive K_L \to \mu^+\mu^- 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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