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Amrouche, C S; Angelozzi, I; Basalaev, A; Buttar, C M; Cao, Y; Cowley, J W; Crépé-Renaudin, S; Croft, V; M J Da Cunha Sargedas De Sousa; Dattagupta, A; Djama, F; Flores, L M; Gibson, S M; Giuli, F; Gongadze, A; Gregor, I M; Held, A; Hopkins, W H; Hoya, J; Ishijima, N; Ishitsuka, M; Jacka, P; Jansky, R; Jovicevic, J; Kaluza, A; Kurova, A; Laforge, B; Lehmann, N; Lister, A; Liu, B L; Loch, P; Lounis, A; Lund-Jensen, B; Lysak, R; Mallik, U; Mermod, P; Meyer, C; Okuyama, T; Osculati, B; Owen, R E; Parida, B; Pedraza Diaz, L; Pilkington, A D; Richter, S; Rinaldi, L; Rühr, F; Sánchez, J; Schleicher, K E; Schnoor, U; Semprini-Cesari, N; Smakhtin, V; Smirnova, L N; Sultan, D M S; Taylor, G N; Tuts, P M; Vorobev, K; Ženiš, T; Živković, L; Wang, Q; Wilson, J A; Wosiek, B K; Yajima, K; Young, C J S; Zhang, L; W L Prado Da Silva; Chen, G; Siikonen, H; Leloup, C; Lethuillier, M; Teroerde, M; Müller, T; Shevchenko, R; Filipovic, N; Dhingra, N; Lohan, M; S My; S Lo Meo; Russo, L; Zumerle, G; Tenchini, R; Monaco, V; Cole, J E; Rumerio, P; Heintz, U; Kole, G; Masciovecchio, M; H Qu; Pata, J; Johnson, A; Sexton-Kennedy, E; Matchev, K; Rosenzweig, D; Gerber, C E; Feng, L; Kropivnitskaya, A; Mignerey, A C; Azzolini, V; Haddad, Y; Barker, A; Volobouev, I
The journal of high energy physics, 05/2019, Letnik: 2019, Številka: 5Journal Article
This paper presents the combinations of single-top-quark production cross-section measurements by the ATLAS and CMS Collaborations, using data from LHC proton-proton collisions at s\ \sqrt{s} \ = 7 and 8 TeV corresponding to integrated luminosities of 1.17 to 5.1 fb−1 at s\ \sqrt{s} \ = 7 TeV and 12.2 to 20.3 fb−1 at s\ \sqrt{s} \ = 8 TeV. These combinations are performed per centre-of-mass energy and for each production mode: t-channel, tW, and s-channel. The combined t-channel cross-sections are 67.5 ± 5.7 pb and 87.7 ± 5.8 pb at s\ \sqrt{s} \ = 7 and 8 TeV respectively. The combined tW cross-sections are 16.3 ± 4.1 pb and 23.1 ± 3.6 pb at s\ \sqrt{s} \ = 7 and 8 TeV respectively. For the s-channel cross-section, the combination yields 4.9 ± 1.4 pb at s\ \sqrt{s} \ = 8 TeV. The square of the magnitude of the CKM matrix element Vtb multiplied by a form factor fLV is determined for each production mode and centre-of-mass energy, using the ratio of the measured cross-section to its theoretical prediction. It is assumed that the top-quark-related CKM matrix elements obey the relation |Vtd|, |Vts| ≪ |Vtb|. All the |fLVVtb|2 determinations, extracted from individual ratios at s\ \sqrt{s} \ = 7 and 8 TeV, are combined, resulting in |fLVVtb| = 1.02 ± 0.04 (meas.) ± 0.02 (theo.). All combined measurements are consistent with their corresponding Standard Model predictions.
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