2014/02/28 by Ashutosh Kumar Alok, Subhashish Banerjee, Dinesh Kumar +1 · 3 citations
Physics and Astronomy · #Bottom quark #Cabibbo–Kobayashi–Maskawa matrix #Flavor #Higgs boson #High-Energy Particle Collisions Research #Large Hadron Collider #Mixing (physics) #Observable #Particle physics #Particle physics theoretical and experimental studies #Physics #Physics beyond the Standard Model #Quantum Chromodynamics and Particle Interactions #Quark #Standard Model (mathematical formulation) #Top quark #hep-ph
paper · pdf · doi:10.1016/j.nuclphysb.2016.03.012
published as Nucl. Phys. B 906 (2016) 321 · Version accepted for publication in Nuclear Physics B
arxiv created 2016/03/09 · openalex publication_date 2016/03/14 · arxiv updated 2016/03/23 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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 χ2 fit to the flavor physics data and obtain the preferred central values along with errors of all the elements of the measurable 3×4 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.