Delta L=2 semileptonic hyperon decays

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

PHYSICAL REVIEW D - PARTICLE AND FILDS

Elsevier

Año: 2007 vol. 76 p. 1160081 - 1160085

0556-2821

We compute the rates of semileptonic B_A -> B_B l^- l^- (l=e or mu) 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 Xi^- -> p mu^- mu^- decay, we derive the bound <m_{nu mu}> < 2.3 TeV for the effective Majorana mass of the muon neutrino. Also, an estimate of background contributions for these decays due to the allowed B_A -> B_B l^- l^- nu nu decays is provided.