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Higgs mediated flavor violating electromagnetic interactions, induced at the one--loop level by a nondiagonal $Hf_if_j$ vertex, with $f_i$ and $f_j$ charged leptons or quarks, are studied within the context of a completely general effective Yukawa sector that comprises $SU_L(2)times U_Y(1)$--invariant operators of up to dimension--six. Exact formulae for the one--loop $gamma f_if_j$ and $gamma gamma f_if_j$ couplings are presented and their related processes used to study the phenomena of Higgs mediated lepton flavor violation. The experimental limit on the $mu to egamma$ decay is used to derive a bound on the branching ratio of the $mu to egamma gamma$ transition, which is 6 orders of magnitude stronger than the current experimental limit. Previous results on the $tau to mu gamma$ and $tau to mu gamma gamma$ decays are reproduced. The possibility of detecting signals of lepton flavor violation at $gamma gamma$ colliders is explored through the $gamma gamma to l_il_j$ reaction, putting special emphasis on the $tau mu$ final state. Using the bound imposed on the $Htau mu$ vertex by the current experimental data on the muon anomalous magnetic moment, it is found that about half a hundred events may be produced in the International Linear Collider.
Exotic Higgs decays are promising channels to discover new physics in the near future. We present a simple model with a new light scalar that couples to the Standard Model through a charged lepton-flavor violating interaction. This can yield exciting
We report on our study of the LFV processes mu to egamma, muto eee and mu to e conversion in the context of Little Higgs models. Specifically we examine the Littlest Higgs with T-parity (LHT) and the Simplest Little Higgs (SLH) as examples of a Produ
The LHC has recently reported a slight excess in the $hrightarrow tau mu$ channel. If this lepton flavor violating (LFV) decay is confirmed, an extension of the Standard Model (SM) will be required to explain it. In this paper we investigate two diff
The size of the branching ratios for the $tau to mu gamma$ and $tau to mu gamma gamma$ decays induced by a lepton flavor violating Higgs interaction $Htau mu$ is studied in the frame of effective field theories. The best constraint on the $Htau mu$ v
We show that new physics models without new flavor violating interactions can explain the recent anomalies in the $bto sell^+ell^-$ transitions. The $bto sell^+ell^-$ arises from a $Z$ penguin which automatically predicts the $V-A$ structure for the