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AuthorsG. Aad, . et al, S. Bentvelsen, A.P. Colijn, P. de Jong, L. de Nooij, A.D. Doxiadis, H. Garitaonandia, D.A.A. Geerts, M. Gosselink, M.S. Kayl, E. Koffeman, H. Lee, F. Linde, J. Mechnich, I. Mussche, J.P. Ottersbach, M. Rijpstra, N. Ruckstuhl, M. Tsiakiris, E. van der Kraaij, R van der Leeuw, E. van der Poel, I. van Vulpen, Z. van Kesteren, J.C. Vermeulen, M. Vreeswijk
TitleEvidence for the associated production of a W boson and a top quark in ATLAS at sqrt √s = 7 TeV
JournalPhysics Letters B
FacultyFaculty of Science
Institute/dept.FNWI: Institute for High Energy Physics (IHEF)
AbstractThis Letter presents evidence for the associated production of a W boson and a top quark using 2.05 fb−1 of pp collision data at √ s = 7 TeV accumulated with the ATLAS detector at the LHC. The analysis is based on the selection of the dileptonic final states with events featuring two isolated leptons, electron or muon, with significant transverse missing momentum and at least one jet. An approach based on boosted decision trees has been developed to improve the discrimination of single top-quark Wt events from background. A template fit to the final classifier distributions is performed to determine the crosssection. The result is incompatible with the background-only hypothesis at the 3.3σ level, the expected sensitivity assuming the Standard Model production rate being 3.4σ. The corresponding cross-section is determined and found to be σWt = 16.8±2.9 (stat)±4.9 (syst) pb, in good agreement with the Standard Model expectation. From this result the CKM matrix element |Vtb| = 1.03+0.16 −0.19 is derived assuming that the Wt production through |Vts| and |Vtd| is small.
NoteATLAS Collaboration
Document typeArticle
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