PT Journal
AU Durieux, G
   Irles, A
   Miralles, V
   Peñuelas, A
   Perello, M
   Poschl, R
   Vos, M
TI The electro-weak couplings of the top and bottom quarks – Global fit and future prospects
SO Journal of High Energy Physics
JI J. High Energy Phys.
PY 2019
BP 098
EP 44pp
VL 12
IS 12
DI 10.1007/JHEP12(2019)098
LA English
DE Phenomenology of Field Theories in Higher Dimensions
AB 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.
ER