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Título: | Measurement of the top quark pair production charge asymmetry in proton-proton collisions at √s = 7 TeV using the ATLAS detector |
Autor: | Aad, G.; Cabrera, Susana CSIC ORCID; Castillo, Mª Victoria CSIC ORCID; Costa, María José CSIC ORCID; Fassi, F. CSIC ORCID; Ferrer, Antonio CSIC ORCID; Fiorini, L. CSIC ORCID; Fuster, Juan CSIC ORCID; García Navarro, José Enrique CSIC ORCID; González de la Hoz, Santiago CSIC ORCID CVN; Hernández Jiménez, Yesenia CSIC ORCID; Higón, Emilio CSIC ORCID; Irles Quiles, Adrián CSIC ORCID CVN ; Kaci, Mohamed CSIC; Lacasta Llácer, Carlos CSIC ORCID ; Lacuesta, Vicente CSIC; March, Luis CSIC ORCID; Martí García, Salvador; Miñano, Mercedes CSIC ORCID; Mitsou, Vasiliki A. CSIC ORCID ; Moles Valls, Regina CSIC ORCID; Moreno Llácer, María CSIC ORCID; Oliver García, Elena CSIC ORCID; Pedraza López, Sebastián CSIC; Romero Adam, E. CSIC; Ros, Eduardo CSIC ORCID; Salt, José CSIC ORCID; Sánchez Martínez, Victoria CSIC; Soldevila, Urmila CSIC ORCID; Torró Pastor, Emma CSIC ORCID; Valero, Alberto CSIC ORCID; Valladolid Gallego, Eva CSIC; Valls Ferrer, Juan Antonio CSIC ORCID; Villaplana Pérez, Miguel CSIC ORCID; Vos, Marcel CSIC ORCID; Pérez García-Estañ, María Teresa CSIC; ATLAS Collaboration | Palabras clave: | Hadron-Hadron Scattering Top physics |
Fecha de publicación: | 25-feb-2014 | Editor: | Springer Nature | Citación: | Journal of High Energy Physics 2014:107 (2014) | Resumen: | This paper presents a measurement of the top quark pair ( tt¯ ) production charge asymmetry A C using 4.7 fb−1 of proton-proton collisions at a centre-of-mass energy s√ = 7 TeV collected by the ATLAS detector at the LHC. A tt¯ -enriched sample of events with a single lepton (electron or muon), missing transverse momentum and at least four high transverse momentum jets, of which at least one is tagged as coming from a b-quark, is selected. A likelihood fit is used to reconstruct the tt¯ event kinematics. A Bayesian unfolding procedure is employed to estimate A C at the parton-level. The measured value of the tt¯ production charge asymmetry is A C = 0.006 ± 0.010, where the uncertainty includes both the statistical and the systematic components. Differential A C measurements as a function of the invariant mass, the rapidity and the transverse momentum of the tt¯ system are also presented. In addition, A C is measured for a subset of events with large tt¯ velocity, where physics beyond the Standard Model could contribute. All measurements are consistent with the Standard Model predictions. | Descripción: | Aad, G. et al. | Versión del editor: | http://dx.doi.org/10.1007/JHEP02(2014)107 | URI: | http://hdl.handle.net/10261/96840 | DOI: | 10.1007/JHEP02(2014)107 | E-ISSN: | 1029-8479 |
Aparece en las colecciones: | (IFIC) Artículos |
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quark_pair_Aad.pdf | 1,17 MB | Adobe PDF | Visualizar/Abrir |
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