1998/06/30 by D. Guetta, Dafne Guetta, Jesús M. Mira +2 · 1 citation
Physics and Astronomy · #Algorithm #Black Holes and Theoretical Physics #Computer science #Database #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1103/physrevd.59.034019
published as Phys. Rev. D 59, 034019 (1999) · 15 pages, LaTeX, 3 ps-figures (uses epsfig.sty) Minor typos corrected, one normalization factor added to Eq. (3.11). To be published on Phys. Rev. D
arxiv created 1998/11/03 · openalex publication_date 1999/01/11 · openalex created_date 2016/06/24 · arxiv updated 2016/08/24 · openalex updated_date 2026/08/05
Being strictly forbidden in the standard model, experimental detection of the lepton flavor violating decays B(B)\ensuremath→\ensuremathτ+\ensuremathμ^\ensuremath- and b(b)\ensuremath→X\ensuremathτ+\ensuremathμ^\ensuremath- would constitute an unmistakable indication of new physics. We study these decays in supersymmetric models without R parity and without lepton number. In order to derive order of magnitude predictions for the branching ratios, we assume a horizontal U(1) symmetry with horizontal charges chosen to explain the magnitude of fermion masses and quark mixing angles. We find that the branching ratios for decays with a \ensuremathτ\ensuremathμ pair in the final state are not particularly suppressed with respect to the lepton flavor conserving channels. In general in these models B[\stackrel\ensuremath→b\ensuremathμ+\ensuremathμ^\ensuremath-(X)]\ensuremath\lesssimB[b(b)\ensuremath→\ensuremathτ+\ensuremathμ^\ensuremath-(X)]\ensuremath\lesssimB[\stackrel\ensuremath→b\ensuremathτ+\ensuremathτ^\ensuremath-(X)]. While in some cases the rates for final states \ensuremathτ+\ensuremathτ^\ensuremath- can be up to one order of magnitude larger than the lepton flavor violating channel, due to better efficiencies for muon detection and to the absence of standard model contributions, decays into \ensuremathτ\ensuremathμ final states appear to be better suited to reveal this kind of new physics.