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

1999/01/21 by J. O. Eeg, Eeg, J. O., Krešimir Kumerički +4
Physics and Astronomy · #Advanced X-ray Imaging Techniques #Amplitude #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Laser-Matter Interactions and Applications #Optics #Photon #Physics #hep-ph

paper · pdf · open access · doi:10.48550/arxiv.hep-ph/9901372

published in arXiv (Cornell University) (Cornell University) · 5 pages, 2 figures, presented by K.K. on the conference "Nuclear and Particle Physics with CEBAF", Dubrovnik, Croatia, Nov 3-10, 1998

arxiv created 1999/01/21 · openalex publication_date 1999/01/21 · arxiv updated 2009/11/30 · openalex created_date 2024/04/10 · openalex updated_date 2026/07/28

Abstract

We report on the calculation of the two-loop electroweak, two-photon mediated short-distance dispersive K_L → 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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