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

T. Aaltonen et al. (CDF Collaboration)
Phys. Rev. Lett. 110, 071801 – Published 13 February 2013

Abstract

The first observation of the production of a W boson with a single charm quark (c) jet in pp¯ collisions at s=1.96TeV is reported. The analysis uses data corresponding to 4.3fb1, 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 σWc(pTc>20GeV/c,|ηc|<1.5)×B(Wν) is measured to be 13.63.1+3.4pb and is in agreement with theoretical expectations. From this result the magnitude of the quark-mixing matrix element Vcs is derived, |Vcs|=1.08±0.16 along with a lower limit of |Vcs|>0.71 at the 95% confidence level, assuming that the Wc production through c to s quark coupling is dominant.

  • Figure
  • Received 10 September 2012

DOI:https://doi.org/10.1103/PhysRevLett.110.071801

© 2013 American Physical Society

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Vol. 110, Iss. 7 — 15 February 2013

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