Higgs and Z-boson FCNC decays correlated with B-meson decays in littlest Higgs model with T-parity

Abstract

In the littlest Higgs model with T-parity (LHT) new flavor-changing interactions between mirror fermions and the Standard Model (SM) fermions can induce various FCNC decays for B-mesons, Z-boson and Higgs boson. Since all these decays induced in the LHT model are correlated, we in this work perform a collective study for these decays, namely the Z-boson decay Z -> b s_bar, the Higgs boson decay h -> b s_bar, and the B-meson decays B -> X_s γ, B_s -> μ^+μ^- and B -> X_s μ^+ μ^-. We find that under the current experimental constraints from the B-decays, the branching ratios of both Z -> b s_bar and h -> b s_bar can still deviate from the SM predictions significantly. In the parameter space allowed by the B-decays, the branching ratio of Z -> b s_bar can be enhanced to 10^{-7} (about one order above the SM prediction) while h -> b s_bar can be much suppressed relative to the SM prediction (about one order below the SM prediction).

13 pages, 3 figures

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• Inverse see-saw neutrino masses in the Littlest Higgs model with T-parity
• Higgs boson decays and production in the left-right twin Higgs model
• Probing lepton flavor violation signal via e+ e- (gamma gamma) ---> l(i) anti-l(j) in the littlest Higgs model with T-parity at the ILC
• Testing the Littlest Higgs Model with T-parity in Bottom Quark Pair Production at High Energy Photon Colliders
• Flavor violating leptonic decays of the Higgs boson
• R_b Constraints on Littlest Higgs Model with T-parity