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

Publication ,  Journal Article
Aad, G; Abbott, B; Abdallah, J; Abdel Khalek, S; Abdelalim, AA; Abdinov, O; Abi, B; Abolins, M; AbouZeid, OS; Abramowicz, H; Abreu, H; Adye, T ...
Published in: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
September 17, 2012

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 3.3σ 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|=1.03−0.19+0.16 is derived assuming that the Wt production through |Vts| and |Vtd| is small.

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Published In

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

DOI

ISSN

0370-2693

Publication Date

September 17, 2012

Volume

716

Issue

1

Start / End Page

142 / 159

Related Subject Headings

  • Nuclear & Particles Physics
  • 51 Physical sciences
  • 49 Mathematical sciences
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
  • 0201 Astronomical and Space Sciences
  • 0105 Mathematical Physics
 

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Aad, G., Abbott, B., Abdallah, J., Abdel Khalek, S., Abdelalim, A. A., Abdinov, O., … Arutinov, D. (2012). Evidence for the associated production of a W boson and a top quark in ATLAS at √s=7TeV. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 716(1), 142–159. https://doi.org/10.1016/j.physletb.2012.08.011
Aad, G., B. Abbott, J. Abdallah, S. Abdel Khalek, A. A. Abdelalim, O. Abdinov, B. Abi, et al. “Evidence for the associated production of a W boson and a top quark in ATLAS at √s=7TeV.” Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 716, no. 1 (September 17, 2012): 142–59. https://doi.org/10.1016/j.physletb.2012.08.011.
Aad G, Abbott B, Abdallah J, Abdel Khalek S, Abdelalim AA, Abdinov O, et al. Evidence for the associated production of a W boson and a top quark in ATLAS at √s=7TeV. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. 2012 Sep 17;716(1):142–59.
Aad, G., et al. “Evidence for the associated production of a W boson and a top quark in ATLAS at √s=7TeV.” Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 716, no. 1, Sept. 2012, pp. 142–59. Scopus, doi:10.1016/j.physletb.2012.08.011.
Aad G, Abbott B, Abdallah J, Abdel Khalek S, Abdelalim AA, Abdinov O, Abi B, Abolins M, AbouZeid OS, Abramowicz H, Abreu H, Acerbi E, Acharya BS, Adamczyk L, Adams DL, Addy TN, Adelman J, Adomeit S, Adragna P, Adye T, Aefsky S, Aguilar-Saavedra JA, Aharrouche M, Ahlen SP, Ahles F, Ahmad A, Ahsan M, Aielli G, Akdogan T, Åkesson TPA, Akimoto G, Akimov AV, Akiyama A, Alam MS, Alam MA, Albert J, Albrand S, Aleksa M, Aleksandrov IN, Alessandria F, Alexa C, Alexander G, Alexandre G, Alexopoulos T, Alhroob M, Aliev M, Alimonti G, Alison J, Allbrooke BMM, Allport PP, Allwood-Spiers SE, Almond J, Aloisio A, Alon R, Alonso A, Alvarez Gonzalez B, Alviggi MG, Amako K, Amelung C, Ammosov VV, Amorim A, Amram N, Anastopoulos C, Ancu LS, Andari N, Andeen T, Anders CF, Anders G, Anderson KJ, Andreazza A, Andrei V, Anduaga XS, Angerami A, Anghinolfi F, Anisenkov A, Anjos N, Annovi A, Antonaki A, Antonelli M, Antonov A, Antos J, Anulli F, Aoun S, Aperio Bella L, Apolle R, Arabidze G, Aracena I, Arai Y, Arce ATH, Arfaoui S, Arguin JF, Arik E, Arik M, Armbruster AJ, Arnaez O, Arnal V, Arnault C, Artamonov A, Artoni G, Arutinov D. Evidence for the associated production of a W boson and a top quark in ATLAS at √s=7TeV. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. 2012 Sep 17;716(1):142–159.
Journal cover image

Published In

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

DOI

ISSN

0370-2693

Publication Date

September 17, 2012

Volume

716

Issue

1

Start / End Page

142 / 159

Related Subject Headings

  • Nuclear & Particles Physics
  • 51 Physical sciences
  • 49 Mathematical sciences
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
  • 0201 Astronomical and Space Sciences
  • 0105 Mathematical Physics