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Is Vtb ≃ 1?

Alwall, J. ; Frederix, R. LU orcid ; Gérard, J. M. ; Giammanco, A. ; Herquet, M. ; Kalinin, S. ; Kou, E. ; Lemaitre, V. and Maltoni, F. (2007) In European Physical Journal C 49(3). p.791-801
Abstract

The strongest constraint on Vtb presently comes from the 3 × 3 unitarity of the CKM matrix, which fixes Vtb to be very close to one. If 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... (More)

The strongest constraint on Vtb presently comes from the 3 × 3 unitarity of the CKM matrix, which fixes Vtb to be very close to one. If 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.

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author
; ; ; ; ; ; ; and
publishing date
type
Contribution to journal
publication status
published
subject
in
European Physical Journal C
volume
49
issue
3
pages
11 pages
publisher
Springer
external identifiers
  • scopus:33846706207
ISSN
1434-6044
DOI
10.1140/epjc/s10052-006-0137-y
language
English
LU publication?
no
id
e0bfef7a-b7a8-4670-96e2-9b0d311b6049
date added to LUP
2019-05-28 14:41:20
date last changed
2022-03-02 23:27:37
@article{e0bfef7a-b7a8-4670-96e2-9b0d311b6049,
  abstract     = {{<p>The strongest constraint on V<sub>tb</sub> presently comes from the 3 × 3 unitarity of the CKM matrix, which fixes V<sub>tb</sub> to be very close to one. If unitarity is relaxed, current information from top production at Tevatron still leaves open the possibility that V<sub>tb</sub> 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 V<sub>tb</sub>. We discuss the experimental perspectives of discovering and identifying such new physics models at the Tevatron and the LHC, through a precise measurement of V<sub>tb</sub> from the single top cross sections and by the study of processes where the extra heavy quarks are produced.</p>}},
  author       = {{Alwall, J. and Frederix, R. and Gérard, J. M. and Giammanco, A. and Herquet, M. and Kalinin, S. and Kou, E. and Lemaitre, V. and Maltoni, F.}},
  issn         = {{1434-6044}},
  language     = {{eng}},
  month        = {{02}},
  number       = {{3}},
  pages        = {{791--801}},
  publisher    = {{Springer}},
  series       = {{European Physical Journal C}},
  title        = {{Is V<sub>tb</sub> ≃ 1?}},
  url          = {{http://dx.doi.org/10.1140/epjc/s10052-006-0137-y}},
  doi          = {{10.1140/epjc/s10052-006-0137-y}},
  volume       = {{49}},
  year         = {{2007}},
}