Abstract: The mW − mZ interdependence in the Standard Model is studied in the MS¯ scheme at the two-loop level, including the known higher-order contributions. The relevant radiative parameters, (Formula presented.) are computed at O(α2) taking into account higherorder QCD corrections and the resummation of the reducible contributions. We obtain mW = 80.357 ± 0.009 ± 0.003 GeV where the errors refer to the parametric and theoretical uncertainties, respectively. A comparison with the known result in the On-Shell scheme gives a difference of ≈ 6 MeV. As a byproduct of our calculation we also obtain the MS¯ electromagnetic coupling and the weak mixing angle at the top mass scale, (Formula presented.) and (Formula presented.).
Degrassi, G., Gambino, P., Giardino, P.P. (2015). The mW- mZ interdependence in the Standard Model: a new scrutiny. JOURNAL OF HIGH ENERGY PHYSICS, 2015(5) [10.1007/JHEP05(2015)154].
The mW- mZ interdependence in the Standard Model: a new scrutiny
DEGRASSI, GIUSEPPE;GIARDINO, PIER PAOLO
2015-01-01
Abstract
Abstract: The mW − mZ interdependence in the Standard Model is studied in the MS¯ scheme at the two-loop level, including the known higher-order contributions. The relevant radiative parameters, (Formula presented.) are computed at O(α2) taking into account higherorder QCD corrections and the resummation of the reducible contributions. We obtain mW = 80.357 ± 0.009 ± 0.003 GeV where the errors refer to the parametric and theoretical uncertainties, respectively. A comparison with the known result in the On-Shell scheme gives a difference of ≈ 6 MeV. As a byproduct of our calculation we also obtain the MS¯ electromagnetic coupling and the weak mixing angle at the top mass scale, (Formula presented.) and (Formula presented.).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
