Evidence for single top-quark production in the s-channel in proton-proton collisions at root s=8 TeV with the ATLAS detector using the Matrix Element Method [Elektronisk resurs]
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Aad, G. (författare)
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Bergeås, Elin Kuutmann (författare)
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Brenner, Richard (författare)
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Ekelöf, Tord (författare)
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Ellert, Mattias (författare)
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Ferrari, Arnaud (författare)
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Gradin, P. O. Joakim (författare)
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Isaksson, Charlie (författare)
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Madsen, Alexander (författare)
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Öhman, Henrik (författare)
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Pelikan, Daniel (författare)
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Rangel-Smith, Camilla (författare)
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Zwalinski, L. (författare)
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Uppsala universitet Teknisk-naturvetenskapliga vetenskapsområdet (utgivare)
- 2016
- Engelska.
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Ingår i: Physics Letters B. - 0370-2693. ; 756, 228-246
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- This Letter presents evidence for single top-quark production in the s-channel using proton-proton collisions at a centre-of-mass energy of 8 TeV with the ATLAS detector at the CERN Large Hadron Collider. The analysis is performed on events containing one isolated electron or muon, large missing transverse momentum and exactly two b-tagged jets in the final state. The analysed data set corresponds to an integrated luminosity of 20.3 fb(-1). The signal is extracted using a maximum-likelihood fit of a discriminant which is based on the matrix element method and optimized in order to separate single-top-quark s-channel events from the main background contributions, which are top-quark pair production and W boson production in association with heavy-flavour jets. The measurement leads to an observed signal significance of 3.2 standard deviations and a measured cross-section of sigma s = 4.8 +/- 0.8(stat.)(-1.3)(+1.6)(syst.) pb, which is consistent with the Standard Model expectation. The expected significance for the analysis is 3.9 standard deviations.
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