Precision Measurements of Electroweak Parameters with Z Bosons at the Tevatron

Abstract

We report on the extraction of ${\sin }^2{\theta }_{\mathrm{eff}}^{\mathrm{lept}}(M_Z)$ and an indirect measurement of the mass of the W boson from the forward-backward asymmetry of dilepton events in the $Z$ boson mass region at the Tevatron. The data samples of $e^{+}{e}^{-}$ and ${\mu }^{+}{\mu }^{-}$ events collected by the CDF detector correspond to the full 9.4 fb${}^{-1}$ run II sample and yield an effective electroweak mixing angle ${\sin }^2{\theta }_{\mathrm{eff}}^{\mathrm{lept}}(M_Z)=0.23222\pm 0.00046$. The corresponding result reported by the D0 collaboration with the full 9.4 fb${}^{-1}$ $e^{+}e-$ sample is ${\sin }^2{\theta }_{\mathrm{eff}}^{\mathrm{lept}}(M_Z)=0.23146\pm 0.00047$. The CDF collaboration also extracts the on-shell electroweak mixing angle ${\sin }^2{\theta }_W=0.22401\pm 0.00044$ which corresponds to an indirect measurement of the W boson mass $M_W(\mathrm{indirect})=80.327\pm 0.023\mathrm{GeV}$. The quoted uncertainties include both statistical and systematic contributions.

For the CDF and D0 Collaborations, in Proceedings of the Third Annual Large Hadron Collider Physics Conference LHCP15, Aug. 31-Sept 5, 2015 Saint Petersburg, Russia. 13 pages, 6 figures

References in corpus (4)

• Measurement of the top quark mass using proton-proton data at sqrt(s) = 7 and 8 TeV
• Measurement of the top quark mass in the $t\bar{t}\to \mathrm{lepton}+\mathrm{jets}$ and $t\bar{t}\to \mathrm{dilepton}$ channels using $\sqrt{s}=7$ TeV ATLAS data
• Measurement of the forward-backward asymmetry of electron and muon pair-production in $pp$ collisions at $\sqrt{s}$ = 7 TeV with the ATLAS detector
• Measurement of the forward-backward asymmetry in $Z/{\gamma }^{\ast }\to {\mu }^{+}{\mu }^{-}$ decays and determination of the effective weak mixing angle