The electro-weak couplings of the top and bottom quarks — Global fit and future prospects - Archive ouverte HAL
Article Dans Une Revue Journal of High Energy Physics Année : 2019

The electro-weak couplings of the top and bottom quarks — Global fit and future prospects

Gauthier Durieux
  • Fonction : Auteur
Víctor Miralles
  • Fonction : Auteur
Ana Peñuelas
  • Fonction : Auteur
Roman Pöschl
Martín Perelló
  • Fonction : Auteur
Marcel Vos
  • Fonction : Auteur

Résumé

We evaluate the implications of LHC and LEP/SLC measurements for the electro-weak couplings of the top and bottom quarks. We derive global bounds on the Wilson coefficients of ten two-fermion operators in an effective field theory description. The combination of hadron collider data with Z -pole measurements is found to yield tight limits on the operator coefficients that modify the left-handed couplings of the bottom and top quark to the Z boson. We also present projections for the high-luminosity phase of the LHC and for future electron-positron colliders. The bounds on the operator coefficients are expected to improve substantially during the remaining LHC programme, by factors of 1 to 5 if systematic uncertainties are scaled as statistical ones. The operation of an e$^{+}$e$^{−}$ collider at a center-of-mass energy above the top-quark pair production threshold is expected to further improve the bounds by one to two orders of magnitude. The combination of measurements in pp and e$^{+}$e$^{−}$ collisions allows for a percent-level determination of the top-quark Yukawa coupling, that is robust in a global fit.

Dates et versions

hal-02283595 , version 1 (11-09-2019)

Identifiants

Citer

Gauthier Durieux, Adrian Irles, Víctor Miralles, Ana Peñuelas, Roman Pöschl, et al.. The electro-weak couplings of the top and bottom quarks — Global fit and future prospects. Journal of High Energy Physics, 2019, 12, pp.98. ⟨10.1007/JHEP12(2019)098⟩. ⟨hal-02283595⟩
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