Hadronic structure aspects of $K^+\to Ï^-+ l^{+}_1 + l^{+}_2$ decays

Mikhail Ivanov; Sergey Kovalenko

doi:10.1103/PhysRevD.71.053004

paper

Hadronic structure aspects of $K^{+} \to I ¨ ^{-} + l_{1}^{+} + l_{2}^{+}$ decays

arXiv:hep-ph/0412198 · doi:10.1103/PhysRevD.71.053004

Abstract

As is known from previous studies the lepton number violating decays $K^{+} \to I ¨ ^{-} + l_{1}^{+} + l_{2}^{+}$ have good prospects to probe new physics beyond the Standard Model and provide valuable information on neutrino masses and mixing. We analyze these processes with an emphasis on their hadronic structure aspects applying relativistic constituent quark model. We conclude that the previously ignored contribution associated with the t-channel Majorana neutrino exchange is comparable with the s-channel one in a wide range of neutrino masses. We also estimated model independent absolute upper bounds on neutrino contribution to these decays.

15 pages, 1 figure. Version to appear in PRD, normalization factor in Eq. (25) is corrected

Hadronic structure aspects of K+→I¨−+l1+​+l2+​ decays

Abstract

Hadronic structure aspects of $K^{+} \to I ¨ ^{-} + l_{1}^{+} + l_{2}^{+}$ decays