Lepton flavor violating Higgs boson decays, τμγ\tau \to \mu \gamma and Bsμ+μB_s \to \mu^{+} \mu^{-} in the constrained MSSM+NR with large tan beta

Oct, 2005
43 pages
Published in:
  • Nucl.Phys.B 760 (2007) 38-63
e-Print:
Report number:
  • KAIST-TH-2005-17

Citations per year

2005200920132017202102468
Abstract:
Realistic predictions are made for the rates of lepton flavour violating Higgs boson decays, tau --> mu gamma, mu --> e gamma, Bs --> mu+mu-, Bs --> tau mu and tau --> 3mu, via a top-down analysis of the Minimal Supersymmetric Standard Model(MSSM) constrained by SU(5) unification with right-handed Neutrinos and large tan beta. The third family neutrino Yukawa coupling is chosen to be of order 1, in this way our model bares a significant resemblance to supersymmetric SO(10). In this framework the large PMNS mixings result in potentially large lepton flavour violation. Our analysis predicts tau --> mu gamma and mu --> e gamma rates in the region (10^{-8}-10^{-6}) and (10^{-15}-10^{-14}) respectively. We also show that the rates for lepton flavour violating Higgs decays can be as large as 10^{-7}. The non-decoupling nature of H --> tau mu is observed which leads to its decay rate becoming comparable to that for tau --> mu gamma for large values of m_0 and M_1/2. We also find that the present bound on Bs --> mu+mu- is an important constraint on the rate of lepton flavour violating Higgs decays. The recently measured Bs-Bsbar mixing parameter Delta Ms is also investigated.
Note:
  • 27 pages, 15 postscript figures, 1 table. Small changes made to the text and title. Updated references. Bs-Bsbar analysis also included Report-no: KAIST-TH 2005/17 DOI: 10.1016/j.nuclphysb.2006.10.011
  • Higgs particle: leptonic decay
  • lepton: radiative decay
  • B/s: leptonic decay
  • Higgs particle: width
  • lepton: branching ratio
  • B/s: branching ratio
  • coupling: Yukawa
  • flavor: violation
  • neutral current: flavor changing
  • grand unified theory: SU(5)