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Title:	Combinations of single-top-quark production cross-section measurements and |f LV Vtb| determinations at √s = 7 and 8 TeV with the ATLAS and CMS experiments
Authors:	Álvarez Piqueras, D. ; Aparisi Pozo, J. A.; Bailey, A. J.; Barranco, Laura; Cabrera, Susana ; Castillo, F. L.; Castillo, Mª Victoria ; Cerda Alberich, L.; Costa, María José ; Escobar, Carlos ; Estrada, Oscar; Ferrer, Antonio ; Fiorini, L. ; Fullana, Esteban ; Fuster, Juan ; García García, Carmen ; García Navarro, José Enrique ; González de la Hoz, Santiago ; Gonzalvo Rodríguez, Galo Rafael; Higón, Emilio ; Jimenez Pena, Javier; Lacasta Llácer, Carlos ; Lozano Bahilo, José J.; Madaffari, Daniele; Mamuzic, Judita; Martí García, Salvador ; Melini, Davide; Miñano Moya, M.; Mitsou, Vasiliki A. ; Rodriguez Bosca, S.; Rodriguez Rodriguez, D.; Ruiz Martínez, Arantxa ; Salt, José ; Santra, A.; Sánchez Martínez, Javier ; Soldevila, Urmila ; Valero, Alberto ; Valls Ferrer, Juan Antonio ; Vos, Marcel ; ATLAS Collaboration; CMS Collaboration; Cabrillo, I. J. ; Calderon, Alicia ; Chazin Quero, B.; Duarte Campderros, J. ; Fernández, M. ; Fernández-Manteca, Pedro; García Alonso, A.; García-Ferrero, J. ; Gómez, G. ; López Virto, A. ; Marco, Jesús ; Martínez-Rivero, Celso ; Martínez Ruiz del Arbol, P. ; Matorras, Francisco ; Piedra, Jonatan ; Prieels, C.; Rodrigo, Teresa ; Ruiz Jimeno, Alberto ; Scodellaro, Luca ; Trevisani, N. ; Vila, Iván ; Vilar, Rocío
Issue Date:	May-2019
Publisher:	Springer Nature
Citation:	Journal of High Energy Physics 2019: 88 (2019)
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 at s = 7 TeV and 12.2 to 20.3 fb 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 multiplied by a form factor f 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|, |V| ≪ |V|. All the |fV| determinations, extracted from individual ratios at s = 7 and 8 TeV, are combined, resulting in |fV| = 1.02 ± 0.04 (meas.) ± 0.02 (theo.). All combined measurements are consistent with their corresponding Standard Model predictions.[Figure not available: see fulltext.].
Description:	The ATLAS and CMS collaborations: et al.
Publisher version (URL):	https://doi.org/10.1007/JHEP05(2019)088
URI:	http://hdl.handle.net/10261/194585
DOI:	http://dx.doi.org/10.1007/JHEP05(2019)088
Identifiers:	doi: 10.1007/JHEP05(2019)088 issn: 1029-8479
Appears in Collections:	(IFCA) Artículos (IFIC) Artículos