| Resumen |
Drell-Yan lepton pairs produced in the process pp¯ → ℓ
+ℓ
− + X through an intermediate γ
∗
/Z
boson have an asymmetry in their angular distribution related to the spontaneous symmetry breaking
of the electroweak force and the associated mixing of its neutral gauge bosons. The CDF and
D0 experiments have measured the effective-leptonic electroweak mixing parameter sin2
θ
lept
eff using
electron and muon pairs selected from the full Tevatron proton-antiproton data sets collected in 2001-
2011, corresponding to 9-10 fb−1
of integrated luminosity. The combination of these measurements
yields the most precise result from hadron colliders, sin2
θ
lept
eff = 0.23148 ± 0.00033. This result is
consistent with, and approaches in precision, the best measurements from electron-positron colliders.
The standard model inference of the on-shell electroweak mixing parameter sin2
θW , or equivalently
the W-boson mass MW , using the zfitter software package yields sin2
θW = 0.22324 ± 0.00033 or
equivalently, MW = 80.367 ± 0.017 GeV/c2
. |
