Constraints on the quark mixing matrix with vector-like quarks

Abstract

While a chiral fourth generation of quarks is almost ruled out from the data on Higgs boson production and decay at the Large Hadron Collider, vector-like quarks are still a feasible option to extend the fermionic sector of the Standard Model. Such an extension does not suffer from any anomalies and easily passes the constraints coming from oblique electroweak parameters. We consider such minimal extensions with $SU(2)$ singlet and doublet vector-like quarks that may mix with one, or at the most two, of the Standard Model quarks. Constraints on the new mixing angles and phases are obtained from several $\Delta B=1$ and $\Delta B=2$ processes.

arXiv comment18 pages, 2 figures, pdflatex. v2: More observables added. 20 pages, 2 figures, version to appear in Nuclear Physics B

References in corpus (39)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• Automatized One-Loop Calculations in 4 and D dimensions
• FLAG Review 2019
• B_{s,d} -> l+ l- in the Standard Model with Reduced Theoretical Uncertainty
• Updated NNLO QCD predictions for the weak radiative B-meson decays
• Four Generations and Higgs Physics
• Extra Families, Higgs Spectrum and Oblique Corrections
• Effects of mixing with quark singlets
• Impact of a Higgs boson at a mass of 126 GeV on the standard model with three and four fermion generations
• New Topflavor Models with Seesaw Mechanism
• Sealing the fate of a fourth generation of fermions
• Quark Singlets: Implications and Constraints
• Less space for a new family of fermions
• Electroweak Model and Constraints on New Physics
• Three-loop QCD corrections to B_s -> mu^+ mu^-
• Rare top decays t -> c gamma, t -> c g and CKM unitarity
• LHC Higgs Signatures from Topflavor Seesaw Mechanism
• R_b and New Physics: A Comprehensive Analysis
• LHC Signatures of Two-Higgs-Doublets with Fourth Family
• Constraining models with vector-like fermions from FCNC in K and B physics
• Higgs production and decay with a fourth Standard-Model-like fermion generation
• Implications of Higgs Searches on the Four Generation Standard Model
• New-physics signals of a model with a vector-singlet up-type quark
• How sensitive to FCNC can $B^0$ CP asymmetries be?
• The Hunt for New Physics in the Flavour Sector with up vector-like quarks
• $\Delta F=2$ Effective Lagrangian in theories with vector like fermions
• The Zbb Couplings at Future e+e- Colliders
• The (Q_7,Q_{1,2}) contribution to B -> X_s gamma at O(alpha_s^2)
• Flavor signatures of isosinglet vector-like down quark model
• Precision Global Determination of the $B\to X_s\gamma$ Decay Rate
• Higgs data does not rule out a sequential fourth generation with an extended scalar sector
• NNLO QCD counterterm contributions to $B$ \to $X_s\gamma$ for the physical value of $m_c$
• Vector Quark Model and B to X_s gamma Decay
• New signals for singlet Higgs and vector-like quarks at the LHC
• Contributions of vector-like quarks to radiative B meson decay
• Non-unitarity of CKM matrix from the vector singlet quark mixing and neutron electric dipole moment
• Flavor-changing interactions with singlet quarks and their implications for the LHC
• Direct CP Asymmetry of B -> X_d,s γin a model with Vector quarks
• Large effects on $\BsBs$ mixing by vector-like quarks

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• A model with vectorlike fermions and $U(1{)}_X$ symmetry: CKM unitarity, $b\to s$ transitions, and prospect at Belle II
• Phenomenological implications of the new Littlest Higgs model with T-parity
• Axion-Neutrino Interplay in a Gauged Two-Higgs-Doublet Model