Forward-backward asymmetry in K+→π+l l+l-

Chuan Hung Chen, C. Q. Geng, I. Lin Ho

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21 Citations (Scopus)


We study the forward-backward asymmetries in the decays of K +→π+l+- (l=e and μ) in the presence of scalar or tensor terms. We find that with the scalar [tensor] type interaction the asymmetry can be up to O(10-3) [O(10 -1)] and arbitrarily large for the electron and muon modes, respectively, without conflict with the experimental data. We also discuss the cases in the minimal supersymmetric standard model where the scalar terms can be induced. In particular, we show that the asymmetry in K+→π +μ+μ- can be as large as O(10 -3) in the large tan β limit, which can be tested in future experiments such as the CKM experiment at Fermilab.

Original languageEnglish
Article number074029
JournalPhysical Review D
Issue number7
Publication statusPublished - 2003

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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