A measurement of the $W \to \tau \nu$ production cross section in $p\bar{p}$ collisions at $\sqrt{s} = 1.8$ TeV

We report on a measurement of sigma(p-pbar to W+X) times B(W to tau+nu) in p-pbar collisions at sqrt(s) = 1.8 TeV at the Fermilab Tevatron. The measurement is based on an integrated luminosity of 18 pb^-1 of data collected with the D0 detector during 1994-1995. We find that sigma(p-pbar to W+X) times B(W to tau+nu) = 2.22 +- 0.09 (stat) +- 0.10 (syst) +- 0.10 (lum) nb. Lepton universality predicts that the ratio of the tau and electron electroweak charged current couplings to the W boson, g_tau^W / g_e^W, be unity. We find g_tau^W / g_e^W = 0.980 +- 0.031, in agreement with lepton universality.

Note:

11 pages, 4 figures, submitted to PRL Report-no: FERMILAB-Pub-99/373-E

D0
anti-p p: colliding beams
anti-p p: inclusive reaction
W: hadroproduction
W: leptonic decay
coupling: (W tau)
coupling: (W electron)
lepton: universality
channel cross section: branching ratio
DZERO

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A measurement of the $W \to \tau \nu$ production cross section in $p\bar{p}$ collisions at $\sqrt{s} = 1.8$ TeV