Evidence for the associated production of a $W$ boson and a top quark in ATLAS at $\sqrt{s}=7$ TeV - INSPIRE

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Evidence for the associated production of a $W$ boson and a top quark in ATLAS at $\sqrt{s}=7$ TeV

ATLAS

Collaboration

May, 2012

18 pages

Published in:

Phys.Lett.B 716 (2012) 142-159

Published: Jul 16, 2013

e-Print:

1205.5764 [hep-ex]

DOI:

10.1016/j.physletb.2012.08.011

Report number:

CERN-PH-EP-2012-117

Experiments:

CERN-LHC-ATLAS

View in:

reference search194 citations

Citations per year

Abstract: (Elsevier)

This 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=7TeV 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 cross-section. The result is incompatible with the background-only hypothesis at the 3.3 σ level, the expected sensitivity assuming the Standard Model production rate being 3.4 σ . 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|=1.03−0.19+0.16 is derived assuming that the Wt production through |Vts| and |Vtd| is small.

Note:

9 pages plus author list (23 pages total), 3 figures, 2 tables, matches published version to appear in PLB

ATLAS
Top quark
W+t
Single top-quark
[formula omitted]
p p: interaction
W: hadroproduction
top: associated production
final state: ((n)jet dilepton)
channel cross section

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