We present a measurement of the effective weak mixing angle parameter $\sin^2\theta_\text{ eff}^{ \ell}$, in $p\bar{ p}\rightarrow Z/\gamma^* \rightarrow \mu^+\mu^-$ events at a center of mass energy of 1.96 TeV, collected by the D0 detector at the Fermilab Tevatron Collider and corresponding to 8.6 fb$^{ -1}$ of integrated luminosity. The measured value of $\sin^2\theta_\text{ eff}^{ \ell}[\mu\mu]=0.23016 \pm 0.00064$ is further combined with the result from the D0 measurement in $p\bar{ p}\rightarrow Z/\gamma^{ *}\rightarrow e^{ +} e^{ -}$ events, resulting in $\sin^2\theta_\text{ eff}^{ \ell} [\text{ comb.}]=0.23095 \pm 0.00040$. This combined result is the most precise measurement from a single experiment at a hadron collider and is the most precise determination using the coupling of the $Z/\gamma^*$ to light quarks.
Categories: hep-ex