First Measurement of $W$ Boson Production in Association with a Single Charm Quark in $p \bar{p}$ Collisions at $\sqrt{s} = 1.96 TeV$

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7 March 2008

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 100 (9) , 091803
https://doi.org/10.1103/physrevlett.100.091803

Abstract

We present the first measurement of the production cross section of a

W

boson with a single charm quark (

c

) in

p \bar{p}

collisions at

\sqrt{s} = 1.96 TeV

, using soft muon tagging of

c

jets. In a data sample of

\sim 1.8 {fb}^{- 1}

, recorded with the Collider Detector at Fermilab II detector at the Fermilab Tevatron, we select events with

W + 1

or 2 jets. We use the charge correlation between the

W

and the muon from the semileptonic decay of a charm hadron to extract the

W c

signal. We measure

σ_{W c} (p_{T c} > 20 GeV / c, | η_{c} | < 1.5) \times BR (W \to ℓ ν) = 9.8 \pm 3.2 pb

, in agreement with theoretical expectations.

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