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Article
Report number arXiv:1108.0366 ; CERN-PH-EP-2011-094 ; CERN-PH-EP-2011-094
Title Inclusive search for same-sign dilepton signatures in pp collisions at s = 7 TeV with the ATLAS detector
Related titleInclusive search for same-sign dilepton signatures in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector
Author(s) ATLAS Collaboration  显示全部 3035 名作者
Publication 2011
Imprint 02 Aug 2011
Number of pages 21
Note Comments: 21 pages plus author list (42 pages total), 12 figures, 4 tables, submitted to JHEP
26 pages plus author list (48 pages total), 12 figures, 5 tables, final version published in JHEP
In: JHEP 10 (2011) 107
DOI 10.1007/JHEP10(2011)107
Subject category Particle Physics - Experiment
Accelerator/Facility, Experiment CERN LHC ; ATLAS
Free keywords exotics ; experimental results
Abstract An inclusive search is presented for new physics in events with two isolated leptons (electron or muon) having the same electric charge. The data are selected from events collected from pp collisions at sqrt(s) = 7 TeV by the ATLAS detector and correspond to an integrated luminosity of 34 inverse picobarns. 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 di-electron, di-muon and electron-muon 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 down-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 down type quarks.
Copyright/License publication: © 2011-2024 CERN (License: CC-BY-3.0)
preprint: © 2011-2024 CERN (License: CC-BY-3.0)



Corresponding record in: Inspire
Email contact: klaus.moenig@cern.ch


 记录创建於2011-08-02,最後更新在2024-03-14


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