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Search for same-sign top-quark production and fourth-generation down-type quarks in pp collisions at root s=7 TeV with the ATLAS detector
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
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2012 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 4, 069- p.Article in journal (Refereed) Published
Abstract [en]

A search is preseritecl for same-sign top-quark production and down-type heavy quarks of charge -1/3 in events with two isolated leptons (c or mu) that have the same electric charge, at least two jets and large missing transverse momentum. The data are selected from pp collisions at root s = 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.

Place, publisher, year, edition, pages
2012. no 4, 069- p.
Keyword [en]
Hardron-Hadron Scattering
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-182924DOI: 10.1007/JHEP04(2012)069ISI: 000304146600069OAI: oai:DiVA.org:uu-182924DiVA: diva2:561375
Note

ATLAS Collaboration, for complete list of authors see http://dx.doi.org/10.1007/JHEP04(2012)069

Available from: 2012-10-18 Created: 2012-10-18 Last updated: 2017-12-07Bibliographically approved

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Brenner, RichardBuszello, Claus P.Ekelöf, TordEllert, MattiasFerrari, ArnaudIsaksson, Charlie

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