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Combinations of single-top-quark production cross-section measurements and | f LV V tb | determinations at √s = 7 and 8 TeV with the ATLAS and CMS experiments

CollaborationWith : Adorni Braccesi Chiassi, Sofia / Akilli, Ece / Amrouche, Cherifa Sabrina / Benoit, Mathieu / Clark, Allan Geoffrey / Della Volpe, Domenico / Di Bello, Francesco / Dubreuil, Arnaud / Ferrere, Didier / Gadatsch, Stefan / Golling, Tobias / Gonzalez Sevilla, Sergio / Iacobucci, Giuseppe / Iizawa, Tomoya / Jansky, Roland / Khoo, Teng Jian / Kiehn, Moritz / Lanfermann, Marie Christine / Lionti, Anthony Eric / Mermod, Philippe / Nessi, Marzio / Nindhito, Herjuno Rah / Paolozzi, Lorenzo / Poggi, Riccardo / Raine, Johnny / Salamani, Dalila / Schramm, Steven / Sfyrla, Anna / Sultan, D M S / Valente, Marco / Vicente Barreto Pinto, Mateus / Wu, Xin / Zaffaroni, Ettore
Published in Journal of High Energy Physics. 2019, vol. 1905, p. 088
Collection Open Access - SCOAP3
Abstract 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 = 7 and 8 TeV corresponding to integrated luminosities of 1.17 to 5.1 fb −1 at √s = 7 TeV and 12.2 to 20.3 fb −1 at √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 = 7 and 8 TeV respectively. The combined tW cross-sections are 16.3 ± 4.1 pb and 23.1 ± 3.6 pb at √s = 7 and 8 TeV respectively. For the s -channel cross-section, the combination yields 4.9 ± 1.4 pb at √s = 8 TeV. The square of the magnitude of the CKM matrix element V tb multiplied by a form factor f LV 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 | V td |, | V ts | ≪ | V tb |. All the | f LV V tb | 2 determinations, extracted from individual ratios at √s = 7 and 8 TeV, are combined, resulting in | f LV V tb | = 1.02 ± 0.04 (meas.) ± 0.02 (theo.). All combined measurements are consistent with their corresponding Standard Model predictions.
Keywords Hadron-Hadron scattering (experiments)
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arXiv: 1902.07158
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ATLAS COLLABORATION. Combinations of single-top-quark production cross-section measurements and | f LV V tb | determinations at √s = 7 and 8 TeV with the ATLAS and CMS experiments. In: Journal of High Energy Physics, 2019, vol. 1905, p. 088. https://archive-ouverte.unige.ch/unige:118805

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Deposited on : 2019-06-04

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