• Mesonic decays of τ lepton: Effects of neutrino mass and mass mixing

    • Fulltext

       

        Click here to view fulltext PDF


      Permanent link:
      https://www.ias.ac.in/article/fulltext/pram/021/05/0329-0337

    • Keywords

       

      τ lepton; Kobayashi-Maskawa mixing matrix; Tau neutrino; neutrino mass; mass mixing

    • Abstract

       

      Experimentally established mesonic decays ofτ lepton have been reexamined with the inclusion of the effects of finite neutrino mass and the associated mass mixing in the form of Kobayashi-Maskawa mixing matrix. A comparison with the experimentally predicted decay probabilities provides limits for thevτ mass which are finite in all decays except for the lower limit in mass mixing case of the decayτK* (892)+vτ for which$$m_{v_\tau } = (420 \pm 610)$$ MeV. The large error in this value is because of (i) large errors in the experimental values of life time and branching ratio for this decay and (ii) thekm mixing used in the calculations. The ratio of parity-violating to parity-conserving terms in the differential decay probabilities of various decays differs slightly from their values corresponding to those with varishingvτ mass.

    • Author Affiliations

       

      R R L Sharma1 2 N K Sharma1

      1. Department of Physics, University of Rajasthan, Jaipur - 302 004, India
      2. Government College, Dholpur - 328 001, India
    • Dates

       
  • Pramana – Journal of Physics | News

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

© 2017-2019 Indian Academy of Sciences, Bengaluru.