Effective Lagrangian description of Higgs mediated flavor violating electromagnetic transitions: implications on lepton flavor violation

Abstract

Higgs mediated flavor violating electromagnetic interactions, induced at the one--loop level by a nondiagonal $H{f}_i{f}_j$ 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 $S{U}_L(2)\times U_Y(1)$--invariant operators of up to dimension--six. Exact formulae for the one--loop $\gamma f_i{f}_j$ and $\gamma \gamma f_i{f}_j$ couplings are presented and their related processes used to study the phenomena of Higgs mediated lepton flavor violation. The experimental limit on the $\mu \to e\gamma$ decay is used to derive a bound on the branching ratio of the $\mu \to e\gamma \gamma$ 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 $\gamma \gamma \to l_i{l}_j$ reaction, putting special emphasis on the $\tau \mu$ final state. Using the bound imposed on the $H\tau \mu$ 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.

18 pages, 12 figures

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Cited by in corpus (12)

• Modified Higgs branching ratios versus CP and lepton flavor violation
• Long Lived Light Scalars as Probe of Low Scale Seesaw Models
• Lepton Flavor Violation Induced by a Neutral Scalar at Future Lepton Colliders
• Higgs mediated flavor violating top quark decays t --> u_i H, u_i gamma, u_i gamma gamma, and the process gamma gamma --> t c in effective theories
• Flavor violation in chromo- and electromagnetic dipole moments induced by $Z^{\prime }$ gauge bosons and a brief revisit of the Standard Model
• Implications of Lorentz violation on Higgs-mediated lepton flavor violation
• Indirect upper limits on ${\ell }_i\to {\ell }_j\gamma \gamma$ from ${\ell }_i\to {\ell }_j\gamma$
• Lepton Flavor Violation from diphoton effective interactions
• Bounding the B_s -> gamma gamma decay from Higgs mediated FCNC transitions
• Lepton flavor violating signals of the LHT model via e^{+}e^{-} and γγcollisions at the ILC
• Charged Lepton Flavor Violation at the High-Energy Colliders: Neutrino Mass Relevant Particles
• Antisymmetric tensor unparticle and the radiative lepton flavor violating decays