About: Evidence for the associated production of a W boson and a top quark in ATLAS at root s=7 TeV

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	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 root 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 cross-section. The result is incompatible with the background-only hypothesis at the 3.3 sigma level, the expected sensitivity assuming the Standard Model production rate being 3.4 sigma. The corresponding cross-section is determined and found to be sigma(wt) = 16.8 +/- 2.9 (stat) +/- 4.9 (syst) pb, in good agreement with the Standard Model expectation. From this result the CKM matrix element vertical bar V-tb vertical bar = 1.03(-0.19)(+0.16) is derived assuming that the Wt production through vertical bar V-ts vertical bar and vertical bar V-td vertical bar is small. 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 root 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 cross-section. The result is incompatible with the background-only hypothesis at the 3.3 sigma level, the expected sensitivity assuming the Standard Model production rate being 3.4 sigma. The corresponding cross-section is determined and found to be sigma(wt) = 16.8 +/- 2.9 (stat) +/- 4.9 (syst) pb, in good agreement with the Standard Model expectation. From this result the CKM matrix element vertical bar V-tb vertical bar = 1.03(-0.19)(+0.16) is derived assuming that the Wt production through vertical bar V-ts vertical bar and vertical bar V-td vertical bar is small. (en)
Title	Evidence for the associated production of a W boson and a top quark in ATLAS at root s=7 TeV Evidence for the associated production of a W boson and a top quark in ATLAS at root s=7 TeV (en)
skos:prefLabel	Evidence for the associated production of a W boson and a top quark in ATLAS at root s=7 TeV Evidence for the associated production of a W boson and a top quark in ATLAS at root s=7 TeV (en)
skos:notation	RIV/61989592:15310/12:33142202!RIV13-MSM-15310___
http://linked.open...avai/predkladatel	Přírodovědecká fakulta
http://linked.open...avai/riv/aktivita	I P Z
http://linked.open...avai/riv/aktivity	I, P(ED2.1.00/03.0058), P(LA08032), P(LC527), Z(AV0Z10100502), Z(MSM0021620859), Z(MSM6840770029), Z(MSM6840770039)
http://linked.open...iv/cisloPeriodika	1
http://linked.open...vai/riv/dodaniDat	2013
http://linked.open...aciTvurceVysledku	Nožka, Libor Hamal, Petr
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Univerzita Palackého v Olomouci / Přírodovědecká fakulta
http://linked.open...dnocenehoVysledku	135265
http://linked.open...ai/riv/idVysledku	RIV/61989592:15310/12:33142202
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	Single top-quark; W plus t; Top quark; ATLAS (en)
http://linked.open.../riv/klicoveSlovo	ATLAS Single top-quark Top quark W plus t
http://linked.open...odStatuVydavatele	NL - Nizozemsko
http://linked.open...ontrolniKodProRIV	[36AE11A5631F]
http://linked.open...i/riv/nazevZdroje	Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics
http://linked.open...in/vavai/riv/obor	BF
http://linked.open...ichTvurcuVysledku	2 (xsd:int)
http://linked.open...cetTvurcuVysledku	2868 (xsd:int)
http://linked.open...vavai/riv/projekt	Regional Centre of Advanced Technologies and Materials International experiment ATLAS-CERN Center for Particle Physics
http://linked.open...UplatneniVysledku	2012
http://linked.open...v/svazekPeriodika	716
http://linked.open...iv/tvurceVysledku	Abbott, B. Abdallah, J. Aad, G. Nožka, Libor Hamal, Petr
http://linked.open...ain/vavai/riv/wos	000309621400007
http://linked.open...n/vavai/riv/zamer	Jevy fyziky elementárních částic přesahující standardní model Výzkum vlastností jader a subjaderných částic a jejich interakcí Matematické, počítačové a experimentální metody ve fyzice Fundamental Experiments in Physics of Microworld
issn	0370-2693
number of pages	18 (xsd:int)
http://bibframe.org/vocab/doi	10.1016/j.physletb.2012.08.011
http://localhost/t...ganizacniJednotka	15310
is http://linked.open...avai/riv/vysledek of	Evidence for the associated production of a W boson and a top quark in ATLAS at root s=7 TeV

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