Measurement of the Effective Weak Mixing Angle in pp¯→Z/γ*→ℓ+ℓ− Events

Le résumé fourni par la source

We present a measurement of the effective weak mixing angle parameter ${\mathrm{sin}}^{2}{\ensuremath{\theta}}_{\text{eff}}^{\ensuremath{\ell}}$ in $p\overline{p}\ensuremath{\rightarrow}Z/{\ensuremath{\gamma}}^{*}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ events at a center-of-mass energy of 1.96 TeV, collected by the D0 detector at the Fermilab Tevatron Collider and corresponding to $8.6\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of integrated luminosity. The measured value of ${\mathrm{sin}}^{2}{\ensuremath{\theta}}_{\text{eff}}^{\ensuremath{\ell}}[\ensuremath{\mu}\ensuremath{\mu}]=0.23016\ifmmode\pm\else\textpm\fi{}0.00064$ is further combined with the result from the D0 measurement in $p\overline{p}\ensuremath{\rightarrow}Z/{\ensuremath{\gamma}}^{*}\ensuremath{\rightarrow}{e}^{+}{e}^{\ensuremath{-}}$ events, resulting in ${\mathrm{sin}}^{2}{\ensuremath{\theta}}_{\text{eff}}^{\ensuremath{\ell}}[\text{comb}]=0.23095\ifmmode\pm\else\textpm\fi{}0.00040$. 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 $Z/{\ensuremath{\gamma}}^{*}$ to light quarks.

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