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Search for contact interactions in dilepton events from pp collisions at sqrt(s) = 7 TeV with the ATLAS detector
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
LAPP, CNRS/IN2P3 and Université de Savoie, Annecy-le-Vieux, France.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
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2012 (English)In: Physics Letters B, ISSN 0370-2693, Vol. 712, no 1-2, 40-58 p.Article in journal (Refereed) Published
Abstract [en]

This Letter presents a search for contact interactions in the dielectron and dimuon channels using data from proton-proton collisions produced by the LHC at sqrt(s) = 7 TeV and recorded by the ATLAS detector. The data sample, collected in 2011, corresponds to an integrated luminosity of 1.08 and 1.21 fb^-1 in the e+ e- and mu+ mu- channels, respectively. No significant deviations from the standard model are observed. Using a Bayesian approach with a prior flat in 1/Lambda^2, the following 95% CL lower limits are placed on the energy scale of llqq contact interactions: Lambda^- > 10.1 TeV (Lambda^+ > 9.4 TeV) in the electron channel and Lambda^- > 8.0 TeV (Lambda^+ > 7.0 TeV) in the muon channel for constructive (destructive) interference in the left-left isoscalar contact interaction model. Limits are also provided for a prior flat in 1/Lambda^4.

Place, publisher, year, edition, pages
2012. Vol. 712, no 1-2, 40-58 p.
Keyword [en]
fermion-pair production, compositeness scales, e(+)e(-) collisions, standard model, physics, quark, constraints, limits, tests, hera
National Category
Subatomic Physics
URN: urn:nbn:se:kth:diva-84571DOI: 10.1016/j.physletb.2012.04.026ISI: 000304742500006ScopusID: 2-s2.0-84860835003OAI: diva2:499407
Swedish Research Council

QC 20120704. Updated from submitted to published.

Available from: 2012-02-13 Created: 2012-02-13 Last updated: 2012-07-04Bibliographically approved

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Kuwertz, EmmaLafaye, RemiLund-Jensen, BengtStrandberg, Jonas
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