The production cross sections of top-quark pairs in association with massive vector bosons have been measured using data from pp collisions at root s = 8 TeV. The dataset corresponds to an integrated luminosity of 20.3 fb(-1) collected by the ATLAS detector in 2012 at the LHC. Final states with two, three or four leptons are considered. A fit to the data considering the t (t) over barW and t (t) over barZ processes simultaneously yields a significance of 5.0 sigma (4.2 sigma) over the background-only hypothesis for t (t) over barW (t (t) over barZ) production. The measured cross sections are sigma(t (t) over barW) = 369(-91)(+100) fb and sigma(t (t) over barZ) = 176(-52)(+58) fb. The background-only hypothesis with neither t (t) over barW nor t (t) over barZ production is excluded at 7.1 sigma. All measurements are consistent with next-to-leading-order calculations for the t (t) over barW and t (t) over barZ processes.

Measurement of the t(t)over-barW and t(t)over-barZ production cross sections in pp collisions at root s=8 TeV with the ATLAS detector / Aad, G., Abbott, B., Abdallah, J., Abdinov, O., Aben, R., Abolins, M., Abouzeid, O.s., Abramowicz, H., Abreu, H., Abreu, R., Abulaiti, Y., Acharya, B.s., Adamczyk, L., Adams, D.l., Adelman, J., Adomeit, S., Adye, T., Affolder, A.a., Agatonovic-Jovin, T., Agricola, J., et al.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1029-8479. - 2015:11(2015), pp. 1-48. [10.1007/JHEP11(2015)172]

Measurement of the t(t)over-barW and t(t)over-barZ production cross sections in pp collisions at root s=8 TeV with the ATLAS detector

Amoroso, S;Artoni, G;Bagnaia, P;Bauce, M;Biglietti, M;Bini, C;Calandri, A;Canale, V;Carlino, G;Ciapetti, G;Da Via, C;De Cecco, S;De Pedis, D;Di Domenico, A;Gauzzi, P;Gentile, S;Giagu, S;Hu, D;Ippolito, V;Kado, M;Kagan, M;Kawamoto, T;Kimura, N;Kuna, M;Lacava, F;Lubatti, HJ;Monzani, S;Nemethy, P;Policicchio, A;Pontecorvo, L;Prasad, S;Ragusa, F;Rolli, S;Rubbo, F;Salamanna, G;Tudorache, A;Zanello, L;
2015

Abstract

The production cross sections of top-quark pairs in association with massive vector bosons have been measured using data from pp collisions at root s = 8 TeV. The dataset corresponds to an integrated luminosity of 20.3 fb(-1) collected by the ATLAS detector in 2012 at the LHC. Final states with two, three or four leptons are considered. A fit to the data considering the t (t) over barW and t (t) over barZ processes simultaneously yields a significance of 5.0 sigma (4.2 sigma) over the background-only hypothesis for t (t) over barW (t (t) over barZ) production. The measured cross sections are sigma(t (t) over barW) = 369(-91)(+100) fb and sigma(t (t) over barZ) = 176(-52)(+58) fb. The background-only hypothesis with neither t (t) over barW nor t (t) over barZ production is excluded at 7.1 sigma. All measurements are consistent with next-to-leading-order calculations for the t (t) over barW and t (t) over barZ processes.
2015
Electroweak interaction; Hadron-Hadron scattering; Top physics
01 Pubblicazione su rivista::01a Articolo in rivista
Measurement of the t(t)over-barW and t(t)over-barZ production cross sections in pp collisions at root s=8 TeV with the ATLAS detector / Aad, G., Abbott, B., Abdallah, J., Abdinov, O., Aben, R., Abolins, M., Abouzeid, O.s., Abramowicz, H., Abreu, H., Abreu, R., Abulaiti, Y., Acharya, B.s., Adamczyk, L., Adams, D.l., Adelman, J., Adomeit, S., Adye, T., Affolder, A.a., Agatonovic-Jovin, T., Agricola, J., et al.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1029-8479. - 2015:11(2015), pp. 1-48. [10.1007/JHEP11(2015)172]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1656055
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