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.

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

References in corpus (8)

• Updated NNLO QCD predictions for the weak radiative B-meson decays
• Less space for a new family of fermions
• Electroweak Model and Constraints on New Physics
• LHC Signatures of Two-Higgs-Doublets with Fourth Family
• The (Q_7,Q_{1,2}) contribution to B -> X_s gamma at O(alpha_s^2)
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Cited by in corpus (8)

• Vector-like Singlet Quarks: a Roadmap
• A natural mechanism for approximate Higgs alignment in the 2HDM
• Search for pair production of the heavy vectorlike top partner in same-sign dilepton signature at the HL-LHC
• Search for single vector-like $B$ quark production in hadronic final states at the LHC
• Single production of vectorlike quarks with charge 5/3 at the 14 TeV LHC
• 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