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We present a first study of the single top quark W-associated production (tW)in proton-proton collisions at the LHC at a centre-of-mass energy of 7TeV,using data collected with the CMS experiment. The search is performed in thedileptonic final states ee/e\mu/\mu\mu\ with a selection based on kinematicalproperties and b-tagging information. The contribution of the Z+jets processesto the background is estimated from a sideband in data. Two ttbar dominatedcontrol regions are used to constrain the normalization of top quark pairproduction in the signal region. An excess of events over the expectedbackground is observed. Assigning this excess to events from tW production, theextracted tW cross section is in agreement with the Standard Model expectation.

Search for Single Top tW Associated Production in the Dilepton Channel at CMS