γγ → µτbb ̄ in Susy Higgs mediated lepton flavor violation (∗)

Summary. — The process γγ → µτbb ̄ is studied in the minimal supersymmet-ric standard model within a large tanβ scenario imposing on the parameter space present direct and indirect constraints from B physics and rare LFV τ-decays. At a photon collider based on an e+e − linear collider with s = 800 GeV with the param-eters of the TESLA proposal (expected integrated γγ-luminosity Lγγ = 200 ÷ 500 fb−1) the LFV signal can be probed for masses of the heavy neutral Higgs bosons A,H from 300 GeV up to the kinematical limit ' 600 GeV for 30 ≤ tanβ ≤60. The minimal super symmetric standard model (MSSM) (like the standard model) does not provide any explanation for the neutrino masses and mixing. In order to ac-complish this task, the seesaw mechanism is usually implemented in the MSSM adding right handed neutrinos (ν-MSSM). Compared to the MSSM, the main novelty in the ν-MSSM is the presence of lepton flavor violation (LFV). LFV effects arise both in the gauge interactions [1] (through lepton-slepton-gaugino couplings) and in the Yukawa in-teractions [2]. In particular, LFV Yukawa interactions are greatly enhanced at larg