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

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

2004-12-14

arxiv.org/abs/hep-ph/0412198v5

Phys.Rev. D71 (2005) 053004

Physics

High Energy Physics

High Energy Physics - Phenomenology

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

Scientific paper

10.1103/PhysRevD.71.053004

As is known from previous studies the lepton number violating decays $K^+\to \pi^- + l^{+}_1 + l^{+}_2$ 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.

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