Observation of the Production of a W Boson in Association with a Single Charm Quark

Abstract

The first observation of the production of a $W$ boson with a single charm quark ($c$) jet in $p\bar{p}$ collisions at $\sqrt{s}=1.96\mathrm{TeV}$ is reported. The analysis uses data corresponding to 4.3 fb${}^{-1}$, recorded with the CDF II detector at the Fermilab Tevatron. Charm quark candidates are selected through the identification of an electron or muon from charm-hadron semileptonic decay within a hadronic jet, and a $Wc$ signal is observed with a significance of 5.7 standard deviations. The production cross section ${\sigma }_{Wc}(p_{Tc}>20\mathrm{GeV}/c,|{\eta }_c|<1.5)\times B(W\to \ell \nu )$ is measured to be $13.6_{-3.1}^{+3.4}\mathrm{pb}$ and is in agreement with theoretical expectations. From this result the magnitude of the quark-mixing matrix element $V_{cs}$ is derived, $|V_{cs}|=1.08\pm 0.16$ along with a lower limit of $|V_{cs}|>0.71$ at the 95% confidence level, assuming that the $Wc$ production through $c$ to $s$ quark coupling is dominant.

7 pages, 1 figure

References in corpus (3)

• Parton distributions for the LHC
• Measurement of the $\ttbar$ Production Cross Section in 2 fb${}^{-1}$ of $\ppbar$ Collisions at $\sqrt{s}=1.96$ TeV Using Lepton Plus Jets Events with Soft Muon b-Tagging
• Measurement of the ttbar Production Cross Section in ppbar Collisions at sqrt(s)=1.96 TeV using Soft Electron b-Tagging

Cited by in corpus (3)

• Measurement of the $W+b$-jet and $W+c$-jet differential production cross sections in $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV
• Review of single vector boson production in pp collisions at $\sqrt{s}=7$ TeV
• Review of physics results from the Tevatron: QCD physics