K -> pi pi Phenomenology in the Presence of Electromagnetism

Details K -> pi pi Phenomenology in the Presence of Electromagnetism K -> pi pi Phenomenology in the Presence of Electromagnetism

2000-08-28

arxiv.org/abs/hep-ph/0008290v1

Eur.Phys.J. C18 (2000) 83-95

Physics

High Energy Physics

High Energy Physics - Phenomenology

25 pages, 6 figures

Scientific paper

10.1007/s100520000530

We describe the influence of electromagnetism on the phenomenology of K -> pi pi decays. This is required because the present data were analyzed without inclusion of electromagnetic radiative corrections, and hence contain several ambiguities and uncertainties which we describe in detail. Our presentation includes a full description of the infrared effects needed for a new experimental analysis. It also describes the general treatment of final state interaction phases, needed because Watson's theorem is no longer valid in the presence of electromagnetism. The phase of the isospin-two amplitude A_2 may be modified by 50% -> 100%. We provide a tentative analysis using present data in order to illustrate the sensitivity to electromagnetic effects, and also discuss how the standard treatment of epsilon'/epsilon is modified.

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