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 sbar, the Higgs boson decay h -> b sbar, and the B-meson decays B -> Xs γ, Bs -> μ+μ- and B -> Xs μ+ μ-. We find that under the current experimental constraints from the B-decays, the branching ratios of both Z -> b sbar and h -> b sbar can still deviate from the SM predictions significantly. In the parameter space allowed by the B-decays, the branching ratio of Z -> b sbar can be enhanced to 10-7 (about one order above the SM prediction) while h -> b sbar can be much suppressed relative to the SM prediction (about one order below the SM prediction).