Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-11-20
Phys.Rev. D69 (2004) 094030
Physics
High Energy Physics
High Energy Physics - Phenomenology
13 pages, 5 figures
Scientific paper
10.1103/PhysRevD.69.094030
The long-distance contribution via the two-photon intermediate state to the forward-backward asymmetries in decays K+ --> pi+ l+ l- (l=e and mu) has been studied within the standard model. In order to evaluate the dispersive part of the K+ --> pi+ gamma* gamma* --> pi+ l+ l- amplitude, we employ a phenomenological form factor to soften the ultraviolet behavior of the transition. It is found that, this long-distance transition, although subject to some theoretical uncertainties, can lead to significant contributions to the forward-backward asymmetries, which could be tested in the future high-precise experiments.
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