Large $t\to cZ$ as a Sign of Vector-Like Quarks in Light of the $W$ Mass

  title={Large \$t\to cZ\$ as a Sign of Vector-Like Quarks in Light of the \$W\$ Mass},
  author={Andreas Crivellin and Matthew Kirk and Teppei Kitahara and Federico Mescia},
The rare flavour changing top quark decay t → cZ is a clear sign of new physics and experimentally very interesting due to the huge number of top quarks produced at the LHC. However, there are few (viable) models which can generate a sizable branching ratio for t → cZ – in fact vector-like quarks seem to be the only realistic option. In this paper, we investigate all three representations (under the Standard Model gauge group) of vector-like quarks ( U , Q 1 and Q 7 ) that can generate a sizable… 
3 Citations

Figures and Tables from this paper

Custodial Symmetry Violation in Scalar Extensions of the Standard Model

: The new measurement of the W boson mass from the CDF collaboration shows a significant tension with the Standard Model prediction, which evidences violation of custodial symmetry in the scalar

Vector-like Quarks

  • G. BrancoM. N. Rebelo
  • Physics
    Proceedings of 7th Symposium on Prospects in the Physics of Discrete Symmetries, DISCRETE 2020-2021 — PoS(DISCRETE2020-2021)
  • 2022
In this talk we emphasise the importance of vector-like quarks (VLQs) and their potential to solve some of the open questions of the Standard Model. These are, in some sense minimal extensions of the

The $W\ell\nu$-vertex corrections to W-boson mass in the R-parity violating MSSM

Inspired by the astonished 7 σ discrepancy between the recent CDF-II measurement and the Standard Model prediction on the mass of W -boson, we investigate its unique λ (cid:48) corrections to the



Measurement of the W boson mass.

This is the most precise measurement from a single experiment of the W boson mass in W-->e(nu) decays using 1 fb-1 of data collected with the D0 detector during Run II of the Fermilab Tevatron collider.

High-precision measurement of the W boson mass with the CDF II detector

The mass of the W boson, a mediator of the weak force between elementary particles, is tightly constrained by the symmetries of the standard model of particle physics. The Higgs boson was the last

Probing the top-Higgs boson FCNC couplings via the h→γγ channel at the HE-LHC and FCC-hh

We investigate the sensitivity of future searches for the top-Higgs boson Flavour Changing Neutral Current (FCNC) couplings $tqh$~($q= u, c$) at the proposed High Energy Large Hadron

Rare top quark decays at a 100 TeV proton-proton collider: t→bWZ and t→hc.

We investigate extremely rare top quark decays at a future proton-proton collider with centre-of-mass energy of 100 TeV. We focus on two decay modes: radiative decay with a Z boson, t→bWZ , and

Combination of the Searches for Pair-Produced Vectorlike Partners of the Third-Generation Quarks at sqrt[s]=13  TeV with the ATLAS Detector.

Combined 95% confidence-level upper limits are set on the production cross section for a range of vectorlike quark scenarios, significantly improving upon the reach of the individual searches.

Measurement of the W -boson mass in pp collisions at √ s = 7 TeV with the ATLAS detector

  • Eur. Phys. J. C 78 (2018) 110 [arXiv:1701.07240]. [Erratum: Eur.Phys.J.C 78, 898 (2018)].
  • 2018

FCC-hh: The Hadron Collider: Future Circular Collider Conceptual Design Report Volume 3

  • Eur. Phys. J. ST 228 (2019) 755–1107.
  • 2019

Extra W-boson mass from a D3-brane