Rare B decays in the flip SU(5) Model

Abstract

In the testable Flipped $SU(5)\times U(1{)}_X$ model with TeV-scale vector-like particles from F-theory model building dubbed as the flip SU(5) model, we study the vector-like quark contributions to B physics processes, including the quark mass spectra, Feynman rules, new operators and Wilson coefficients, etc. We focus on the implications of the vector-like quark mass scale on B physics. We find that there exists the $\bar{s}bZ$ interaction at tree level, and the Yukawa interactions are changed. Interestingly, different from many previous models, the effects of vector-like quarks on rare B decays such as $B\to X_s\gamma$ and $B\to X_s{\ell }^{+}{\ell }^{-}$ do not decouple in some viable parameter space, especially when the vector-like quark masses are comparable to the charged Higgs boson mass. Under the constraints from $B\to X_s\gamma$ and $B\to X_s{\ell }^{+}{\ell }^{-}$, the latest measurement for $B_s\to {\mu }^{+}{\mu }^{-}$ can be explained naturally, and the branching ratio of $B_s\to {\ell }^{+}{\ell }^{-}\gamma$ can be up to $(4\sim 5)\times 10^{-8}$. The non-decouling effects are much more predictable and thus the \fsu5 model may be tested in the near future experiments.

21 pages, 4 figures, few references added, accepted for publication in JHEP

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Cited by in corpus (4)

• Rare Decays and CP Violation in the $B_s$ System
• Correlating LHCb B_s^0 to μ^+ μ^- Results with the ATLAS-CMS Multijet Supersymmetry Search
• On Branching Ratios of $B_s$ Decays and the Search for New Physics in $B_s^0\to {\mu }^{+}{\mu }^{-}$
• General scan in flavor parameter space in the models with vector quark doublets and an enhancement in $B\to X_s\gamma$ process