Delta L=2 hyperon semileptonic decays

C. BARBERO, LING-FONG LI, G. LÓPEZ CASTRO, A. MARIANO

PHYSICAL REVIEW D - PARTICLE AND FILDS

American Physical Society

Año: 2007 vol. 76 p. 116008 - 116008

0556-2821

We compute the rates of semileptonic BA ---> BB l-l-  (l = e or muon) hyperon transitions in a model where intermediate states involve loops of baryons and a Majorana neutrino. These rates turn out to be well below present experimental bounds and other theoretical estimates. From the experimental upper limit on the Sigma --> p muon- muon - decay, we derive the bound <m_mu mu> < 22 TeV for the effective Majorana mass of the muon neutrino. Also, an estimate of the  background contributions for these decays due to the allowed   BA ---> BB l-l- antineutrino antineutrino  it is provided.