Search for same-sign top-quark production and fourth-generation down-type quarks in pp collisions at √s = 7 TeV with the ATLAS detector
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Title:
Search for same-sign top-quark production and fourth-generation down-type quarks in pp collisions at √s = 7 TeV with the ATLAS detector
Author:
The ATLAS collaboration; Aad, G.; Arnal, V.; Barreiro, Fernando; Cantero, J.; de la Torre, H.; del Peso, J.; Glasman, C.; Labarga, Luis; Lagouri, T.; Llorente Merino, J.; March, Luis; Nebot, Eduardo; Terron, J.
Entity:
UAM. Departamento de Física Teórica
UAM Author:
Lagouri , Theodota
; Labarga Echeverría, Luis Alfonso
; March Ruiz, Luis
; Nebot Del Busto, Eduardo
; Barreiro Alonso, Fernando
Publisher:
Springer Verlag; SISSA 2012
Date:
2012-04-13
Citation:
10.1007/JHEP04(2012)069
Journal of High Energy Physics 2012.4 (2012): 069
ISSN:
1126-6708 (print); 1029-8479 (online)
DOI:
10.1007/JHEP04(2012)069
Editor's Version:
http://dx.doi.org/10.1007/JHEP04(2012)069
Subjects:
Hadron-hadron scattering; Física
Note:
Journal of High Energy Physics 2012.4 (2012): 069 reproduced by permission of Scuola Internazionale Superiore di Studi Avanzati (SISSA)
Artículo escrito por un elevado número de autores, solo se referencian el que aparece en primer lugar, el nombre del grupo de colaboración, si le hubiere, y los autores pertenecientes a la UAM
Rights:
© SISSA 2012
Abstract:
A search is presented for same-sign top-quark production and down-type heavy quarks of charge -1/3 in events with two isolated leptons (e or μ) that have the same electric charge, at least two jets and large missing transverse momentum. The data are selected from pp collisions at ps = 7 TeV recorded by the ATLAS detector and correspond to an integrated luminosity of 1.04 fb-1. The observed data are consistent with expectations from Standard Model processes. Upper limits are set at 95% confidence level on the cross section of new sources of same-sign top-quark pair production of 1.4-2.0 pb depending on the assumed mediator mass. Upper limits are also set on the pair-production cross-section for new heavy down-type quarks; a lower limit of 450 GeV is set at 95% confidence level on the mass of heavy down-type quarks under the assumption that they decay 100% of the time to Wt
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