Abstract: ABSTRACT: The first observation of the production of a W boson with a single charm quark (c) jet in p¯p collisions at ?s=1.96??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 ?Wc(pTc>20??GeV/c,|?c|<1.5)×B(W???) is measured to be 13.6+3.4?3.1??pb 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.

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