Lepton-flavor violation in light hadron decays

Fajfer, Svjetlana and Ilakovac, Amon (1998) Lepton-flavor violation in light hadron decays. Physical Review D, 57 (7). pp. 4219-4235. ISSN 1550-7998

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The lepton-flavor-violating decays of light pseudoscalar mesons and light baryons are investigated within extensions of the SU(2)×U(1) model. These models contain heavy Dirac or Majorana neutrinos and allow large lepton–heavy-neutrino mixings. The free-parameter space of these models is carefully studied. Special care is devoted to the comparison of results of different models. A large “nondecoupling” window is found, and the decoupling of extremely heavy neutrinos is explicitly shown in all models except one, for which the free-parameter space is bounded. Among the decays studied, the experimentally most interesting decays are KL→eμ and π0→eμ. The π0→eμ decay is found to be equally interesting for the study of lepton-flavor violation as KL→eμ decay. The constraint on the model parameters, coming from the nonobservation of the μ⃗ eγ decay, leads to the maximal decay rates B(KL→eμ)∼5×10-16 and B(π0→eμ)≲(2nR-2)×10-15, where nR is number of heavy neutrinos, much smaller than the present experimental upper limits.

Item Type: Article
Keywords: psudoscalar mesons, lepton flavor violation, heavy neutrino, decoupling
Date: April 1998
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (1998) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Project code: 119222
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 14 May 2014 16:51
Last Modified: 14 May 2014 16:51
URI: http://digre.pmf.unizg.hr/id/eprint/1319

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