This Letter presents a search at the LHC for s-channel single top-quark production in proton-proton collisions at a centre-of-mass energy of 8 TeV. The analyzed data set was recorded by the ATLAS detector and corresponds to an integrated luminosity of 20.3 fb(-1). Selected events contain one charged lepton, large missing transverse momentum and exactly two b-tagged jets. A multivariate event classifier based on boosted decision trees is developed to discriminate s-channel single top-quark events from the main background contributions. The signal extraction is based on a binned maximum-likelihood fit of the output classifier distribution. The analysis leads to an upper limit on the s-channel single topquark production cross-section of 14.6 pb at the 95% confidence level. The fit gives a cross-section of sigma(s) = 5.0 +/- 4.3 pb, consistent with the Standard Model expectation. (C) 2014 The Authors. Published by Elsevier B.V.

Search for s-channel single top-quark production in proton-proton collisions at root s=8 TeV with the ATLAS detector / Iuppa, R; Atlas, Collaboration. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 740:(2015), pp. 118-136. [10.1016/j.physletb.2014.11.042]

Search for s-channel single top-quark production in proton-proton collisions at root s=8 TeV with the ATLAS detector

Iuppa, R;
2015

Abstract

This Letter presents a search at the LHC for s-channel single top-quark production in proton-proton collisions at a centre-of-mass energy of 8 TeV. The analyzed data set was recorded by the ATLAS detector and corresponds to an integrated luminosity of 20.3 fb(-1). Selected events contain one charged lepton, large missing transverse momentum and exactly two b-tagged jets. A multivariate event classifier based on boosted decision trees is developed to discriminate s-channel single top-quark events from the main background contributions. The signal extraction is based on a binned maximum-likelihood fit of the output classifier distribution. The analysis leads to an upper limit on the s-channel single topquark production cross-section of 14.6 pb at the 95% confidence level. The fit gives a cross-section of sigma(s) = 5.0 +/- 4.3 pb, consistent with the Standard Model expectation. (C) 2014 The Authors. Published by Elsevier B.V.
Iuppa, R; Atlas, Collaboration
Search for s-channel single top-quark production in proton-proton collisions at root s=8 TeV with the ATLAS detector / Iuppa, R; Atlas, Collaboration. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 740:(2015), pp. 118-136. [10.1016/j.physletb.2014.11.042]
File in questo prodotto:
File Dimensione Formato  
1-s2.0-S0370269314008442-main.pdf

accesso aperto

Tipologia: Versione editoriale (Publisher’s layout)
Licenza: Creative commons
Dimensione 1.35 MB
Formato Adobe PDF
1.35 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11572/162721
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 27
  • ???jsp.display-item.citation.isi??? 14
social impact