Is Vtb≃1?

2006/07/11 by Johan Alwall, J. Alwall, R. Frederix +11 · 11 citations
Chemistry · Physics and Astronomy · #Chemistry #Dark Matter and Cosmic Phenomena #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex #hep-ph

paper · pdf · doi:10.1140/epjc/s10052-006-0137-y

published as Eur.Phys.J.C49:791-801,2007 · 19 pages, 8 figures

arxiv created 2006/07/11 · openalex publication_date 2006/12/01 · arxiv updated 2014/11/17 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

The strongest constraint on Vtb presently comes from the 3 x 3 unitarity of the CKM matrix, which fixes Vtb to be very close to one. If the unitarity is relaxed, current information from top production at Tevatron still leaves open the possibility that Vtb is sizably smaller than one. In minimal extensions of the standard model with extra heavy quarks, the unitarity constraints are much weaker and the EW precision parameters entail the strongest bounds on Vtb. We discuss the experimental perspectives of discovering and identifying such new physics models at the Tevatron and the LHC, through a precise measurement of Vtb from the single top cross sections and by the study of processes where the extra heavy quarks are produced.

Citations

• QCD and Yukawa corrections to single-top-quark production viaqq¯→tb¯
• Vacuum configurations for superstrings
• Integrable twists in AdS/CFT
• The discovery of the fourth family at the LHC: what if?
• Measuring theW−t−binteraction at the ILC
• Selfduality of non-linear electrodynamics with derivative corrections
• Weak radiative B-meson decay beyond leading logarithms
• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)

Cited by

• Using single top rapidity to measureVtd,Vts,Vtbat hadron colliders
• Four generations and Higgs physics
• Evidence for single top-quark production in the s-channel in proton–proton collisions at s=8 TeV with the ATLAS detector using the Matrix Element Method
• The relevance of virtual electroweak effects in the overall t-channel single top production at LHC
• Measurement of the cross-section for producing a W boson in association with a single top quark in pp collisions at s = 13 √(s)=13 TeV with ATLAS
• Radiative neutrino mass generation through vectorlike quarks
• Observation ofs-Channel Production of Single Top Quarks at the Tevatron
• The impact of a 4th generation on mixing and CP violation in the charm system
• Measurement of differential cross-sections of a single top quark produced in association with a W boson at √(s)=13\text TeV s = 13 TeV with ATLAS
• On the flavor structure of the littlest Higgs model
• Properties of the top quark