Phys. Rev. D 69, 094030 (2004) [6 pages]Long-distance contribution to the forward-backward asymmetry in decays K+→π+l+l-Received 2 December 2003; published 28 May 2004 The long-distance contribution via the two-photon intermediate state to the forward-backward asymmetries in decays K+→π+l+l- (l=e and μ) has been studied within the standard model. In order to evaluate the dispersive part of the K+→π+γ*γ*→π+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 future high-precise experiments. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.69.094030
DOI:
10.1103/PhysRevD.69.094030
PACS:
13.20.Eb, 12.39.Fe
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