Measurement of $\bm{σ(p \bar p \to Z) \cdot}$Br$\bm{(Z \to τ τ)}$ at $\bm{\sqrt{s}=}$1.96 TeV

Details Measurement of $\bm{σ(p \bar p \to Z) \cdot}$Br$\bm{(Z \to τ τ)}$ at $\bm{\sqrt{s}=}$1.96 TeV Measurement of $\bm{σ(p \bar p \to Z) \cdot}$Br$\bm{(Z \to τ τ)}$ at $\bm{\sqrt{s}=}$1.96 TeV

2004-12-07

arxiv.org/abs/hep-ex/0412020v2

Phys.Rev.D71:072004,2005; Erratum-ibid.D77:039901,2008

Physics

High Energy Physics

High Energy Physics - Experiment

Scientific paper

10.1103/PhysRevD.71.072004

We present a measurement of the cross section for $Z$ production times the branching fraction to $\tau$ leptons, $\sigma \cdot$Br$(Z\to \tau^+ \tau^-)$, in $p \bar p$ collisions at $\sqrt{s}=$1.96 TeV in the channel in which one $\tau$ decays into $\mu \nu_{\mu} \nu_{\tau}$, and the other into $\rm {hadrons} + \nu_{\tau}$ or $e \nu_e \nu_{\tau}$. The data sample corresponds to an integrated luminosity of 226 pb$^{-1}$ collected with the D{\O}detector at the Fermilab Tevatron collider. The final sample contains 2008 candidate events with an estimated background of 55%. From this we obtain $\sigma \cdot$Br$(Z \to \tau^+ \tau^-)=237 \pm 15$(stat)$\pm 18$(sys)$ \pm 15$(lum) pb, in agreement with the standard model prediction.

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