Flavor signatures of isosinglet vector-like down quark model

Abstract

We consider a model where the standard model is extended by the addition of a vector-like isosinglet down-type quark b'. We perform a chi square fit to the flavor physics data and obtain the preferred central values along with errors of all the elements of the measurable 3 X 4 quark mixing matrix. The fit indicates that all the new-physics parameters are consistent with zero and the mixing of the b' quark with the other three is constrained to be small. The current flavor physics data rules out possibility of detectable new physics signals in most of the flavor physics observables. We also investigate possible deviations in the standard model Wtb couplings and bottom quark coupling to Higgs boson. We find that these deviations are less than a percent level which is too small to be observed at the LHC with current precision.

Version accepted for publication in Nuclear Physics B

References in corpus (14)

• Big-Bang Nucleosynthesis
• SuperIso v3.0: A program for calculating flavor physics observables in 2HDM and supersymmetry
• SuperIso: A program for calculating the isospin asymmetry of B -> K* gamma in the MSSM
• Correlations among new CP violating effects in Delta F = 2 observables
• Implications of D^0-\bar D^0 Mixing for New Physics
• Epsilon_K at Next-to-Next-to-Leading Order: The Charm-Top-Quark Contribution
• $K\to \pi \pi$ $\Delta I=3/2$ decay amplitude in the continuum limit
• Electroweak Corrections to the Charm Quark Contribution to K+ -> pi+ nu nu-bar
• Logarithmically Enhanced Corrections to the Decay Rate and Forward Backward Asymmetry in anti-B --> X(s) l+ l-
• Measurement of the B->Xsl+l- branching fraction and search for direct CP violation from a sum of exclusive final states
• D-Dbar mixing and new physics: general considerations and constraints on the MSSM
• New-physics signals of a model with a vector-singlet up-type quark
• The rare decays $B_u^{+}\to {\pi }^{+}{\ell }^{+}{\ell }^{-}$, ${\rho }^{+}{\ell }^{+}{\ell }^{-}$ and $B_d^0\to {\ell }^{+}{\ell }^{-}$ in the R-parity violating supersymmetry
• b -> s Decays in a model with Z-mediated flavor changing neutral current

Cited by in corpus (21)

• Vector-like Fermions and Higgs Effective Field Theory Revisited
• QCD next-to-leading-order predictions matched to parton showers for vector-like quark models
• A "Vector-like chiral" fourth family to explain muon anomalies
• Vector-like top/bottom quark partners and Higgs physics at the LHC
• Vector-like Quark Interpretation for the CKM Unitarity Violation, Excess in Higgs Signal Strength, and Bottom Quark Forward-Backward Asymmetry
• Hunting for Vectorlike Quarks
• Vector-like quarks coupling discrimination at the LHC and future hadron colliders
• Asymmetry in flavour changing electromagnetic transitions of vector-like quarks
• Singlet Dirac Fermion Dark Matter with Mediators at Loop
• Solving the fermionic mass hierarchy of the standard model
• $CP$ asymmetries in the rare top decays $t\to c\gamma$ and $t\to cg$
• Constraints on the quark mixing matrix with vector-like quarks
• Single production of $X_{\pm 5/3}$ and $Y_{\mp 4/3}$ vectorlike quarks at the LHC
• Non-standard signatures of vector-like quarks in a leptophobic 221 model
• New signals for vector-like down-type quark in $U(1)$ of $E_6$
• A low scale left-right symmetric mirror model
• Revisiting Vector-like Quark Model with Enhanced Top Yukawa Coupling
• Effective theory analysis for vector-like quark model
• Searching for New physics in Charm Radiative decays
• General scan in flavor parameter space in the models with vector quark doublets and an enhancement in $B\to X_s\gamma$ process
• Scrutinizing new physics of $B_d\to \varphi ({\eta }^{{(}^{\prime })},\pi ,\omega )$ decay modes