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Inclusive Search for Same-Sign Dilepton Signatures in pp Collisions at $\sqrt{s}=7$ TeV with the ATLAS Detector
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). (Elementarpartikelfysik)
Stockholm University, Faculty of Science, Department of Physics. (Systemfysik)
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). (Elementarpartikelfysik)
Stockholm University, Faculty of Science, Department of Physics. (Systemfysik)
2011 (English)In: Journal of High Energy Physics (JHEP), ISSN 1029-8479, E-ISSN 1126-6708, Vol. 10, 107- p.Article in journal (Refereed) Published
##### Abstract [en]

An inclusive search is presented for new physics in events with two isolated leptons (e or μ) having the same electric charge. The data are selected from events collected from pp collisions at Ös = 7 \sqrt {s} = 7 TeV by the ATLAS detector and correspond to an integrated luminosity of 34 pb−1. The spectra in dilepton invariant mass, missing transverse momentum and jet multiplicity are presented and compared to Standard Model predictions. In this event sample, no evidence is found for contributions beyond those of the Standard Model. Limits are set on the cross-section in a fiducial region for new sources of same-sign high-mass dilepton events in the ee, and μμ channels. Four models predicting same-sign dilepton signals are constrained: two descriptions of Majorana neutrinos, a cascade topology similar to supersymmetry or universal extra dimensions, and fourth generation d-type quarks. Assuming a new physics scale of 1 TeV, Majorana neutrinos produced by an effective operator V with masses below 460 GeV are excluded at 95% confidence level. A lower limit of 290 GeV is set at 95% confidence level on the mass of fourth generation d-type quarks.

##### Place, publisher, year, edition, pages
2011. Vol. 10, 107- p.
##### National Category
Subatomic Physics
Physics
##### Identifiers
OAI: oai:DiVA.org:su-65433DiVA: diva2:463697
Atlas
##### Funder
Swedish Research CouncilKnut and Alice Wallenberg Foundation
##### Note
Publikationen har totalt 3035 författare, G. Aad et al.Available from: 2011-12-11 Created: 2011-12-11 Last updated: 2012-03-14Bibliographically approved

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Publisher's full texthttp://dx.doi.org/10.1007/JHEP10(2011)107

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Åsman, BarbroBohm, ChristianClément, ChristopheEriksson, DanielGellerstedt, KarlHellman, StenHidvégi, AttilaHolmgren, Sven-OlofJohansen, MarianneJohansson, ErikJon-And, KerstinLundberg, JohanMilstead, DavidMoa, TorbjörnNordkvist, BjörnOhm, ChristianPapadelis, ArasSelldén, BjörnSilverstein, SamuelSjölin, JörgenStrandberg, SaraTylmad, MajaYang, Zhaoyu
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Department of PhysicsThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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Journal of High Energy Physics (JHEP)
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Subatomic Physics