Semileptonic lepton-number- and/or lepton-flavor-violating {tau} decays in Majorana neutrino models

Journal Article · Sun Oct 01 04:00:00 EDT 1995 · Physical Review, D

DOI:https://doi.org/10.1103/PhysRevD.52.3993· OSTI ID:249534

Ilakovac, A ^[1]; Kniehl, B A ^[2]; Pilaftsis, A ^[3]

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1. Faculty of Science, Department of Physics, Bijenicka 32, 41001 Zagreb (Croatia)
2. Max-Planck-Institut fuer Physik, Foehringer Ring 6, 80805 Munich (Germany)
3. Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX110QX (United Kingdom)

Motivated by the recent investigation of neutrinoless {tau}-lepton decays by the CLEO Collaboration, we perform a systematic analysis of such decays in a possible new-physics scenario with heavy Dirac and/or Majorana neutrinos, including heavy-neutrino nondecoupling effects, finite quark masses, and quark as well as meson mixings. We find that the {tau} lepton decays into an electron or muon and a pseudoscalar or vector meson can have branching ratios close to the experimental sensitivity. Numerical estimates show that the predominant decay modes of this kind are {tau}{sup {minus}}{r_arrow}{ital e}{sup {minus}}{phi}, {tau}{sup {minus}}{r_arrow}{ital e}{sup {minus}}{rho}{sup 0}, and {tau}{sup {minus}}{r_arrow}{ital e}{sup {minus}}{pi}{sup 0}, with branching ratios of the order of 10{sup {minus}6}.

• OSTI ID: 249534
• Journal Information: Physical Review, D, Journal Name: Physical Review, D Journal Issue: 7 Vol. 52; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
BRANCHING RATIO
FLAVOR
LEPTON NUMBER
MAJORANA THEORY
NEUTRINOS
SEMILEPTONIC DECAY
TAU PARTICLES
VIOLATIONS