Lepton Universality, Rare Decays and Split Fermions
نویسنده
چکیده
We investigate the constraint on the split fermions in extra dimensions by considering the universality ofW leptonic decaysW → liνi, the charged lepton decays li → ljνiν̄j, and the lepton flavor violating process li → l̄jlklh where li = e, μ or τ . For the Standard Model (SM) background of W → liνi, we extended the one loop quantum correction to include effects of order ml /M 2 W and the Higgs mass dependence. We find that in general the split fermion scenarios give rise to a 4D effective Yukawa matrix of the Kaluza-Klein Higgs bosons is misaligned with respect to the fermion mass matrix. This holds true also for gauge bosons as well. This leads to decays of li → l̄j lklh at tree level and muonium antimuonium conversion. Interestingly the leptonic universality of W boson decays are not affected at this level. PACS numbers: 11.25.Mj, 12.60.-i, 11.10.Kk
منابع مشابه
Universality , Rare Decays and Split Fermions
We investigate the constraint on the split fermions in extra dimensions by considering the universality of W leptonic decays W → liνi, the lepton decays li → ljνiν̄j, the lepton flavor violating process li → l̄jlklh and the li → ljγ transition where li = e, μ or τ . For the Standard Model (SM) background of W → liνi, we extended the one loop quantum correction to include effects of order ml /M 2 ...
متن کاملSUSY effects in Kaon physics: Lepton Universality tests and rare decays
Deviations from the Standard Model (SM) expectations of the Lepton Universality (LU) breaking represent a powerful tool to probe New Physics (NP) effects. In the present document, we focus on R K = Γ(K e2)/Γ(K µ2), stressing the importance of R K measurements with an accuracy at the % level to probe lepton-flavor violating effects arising in Supersymmetric (SUSY) theories. Finally, we also revi...
متن کاملA L μ − L τ theory of Higgs flavor violation and ( g − 2 )
Several experiments reported hints for the violation of lepton flavor or lepton flavor universality in processes involving muons. Most prominently, there is the hint for a non-zero rate of the flavor violating Higgs decay h→ τμ at the LHC, as well as the hint for lepton flavor universality violation in rare B meson decays at LHCb. In addition, also the long standing discrepancy in the anomalous...
متن کاملFlavor Physics with light quarks and leptons
The impact of rare K decays and lepton-flavor violating processes in shedding light on physics beyond the Standard Model is reviewd. To this purpose, I first recall the formulation of the Minimal Flavor Violation hypothesis –both in the quark and in the lepton sector– and then use it as guiding principle in comparing the new-physics sensitivity of different rare processes. On the phenomenologic...
متن کاملInterpreting Hints for Lepton Flavor Universality Violation
We interpret the recent hints for lepton flavor universality violation in rareB meson decays. Based on a model-independent effective Hamiltonian approach, we determine regions of new physics parameter space that give a good description of the experimental data on RK and RK∗ , which is in tension with Standard Model predictions. We suggest further measurements that can help narrowing down viable...
متن کامل