Large 2HDM(II) one-loop corrections in leptonic tau decays

  • M. Krawczyk
  • D. Temes
Theoretical Physics


The one-loop contributions to the branching ratios for leptonic \(\tau\) decays are calculated in the CP-conserving 2HDM(II). The analysis is focused on large \(\tan \beta\) enhanced contributions. We found that these contributions, involving loops with both neutral and charged Higgs bosons, dominate over the tree-level \(H^{\pm}\) exchange, the latter one being totally negligible for the decay into e. We derive a simple analytical expression for the one-loop contribution which holds in the large \(\tan \beta\) case. We show that the leptonic branching ratios of \(\tau\) are complementary to the Higgsstrahlung processes for h(H) and have a large potential in constraining the parameters of the model. In this work we provide upper limits on the Yukawa couplings for both light h and light A scenarios, and we derive a new lower limit on the mass of \(H^\pm\) as a function of \(\tan \beta\) which differs significantly from what was considered as a standard constraint based on the tree-level \(H^{\pm}\) exchange only. Interestingly we also obtain an upper limit on \(M_{H^\pm}\).


Field Theory Elementary Particle Lower Limit Quantum Field Theory Higgs Boson 
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© Springer-Verlag Berlin/Heidelberg 2005

Authors and Affiliations

  • M. Krawczyk
    • 1
  • D. Temes
    • 2
  1. 1.Institute of Theoretical PhysicsUniversity of WarsawWarsawPoland
  2. 2.Laboratoire de Physique Théorique LAPTHAnnecy-le-Vieux, CedexFrance

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