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Search for contact interactions and large extra dimensions in dilepton events from pp collisions at root s=7 TeV with the ATLAS detector
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
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Number of Authors: 2906
2013 (English)In: Physical Review D, ISSN 1550-7998, E-ISSN 1550-2368, Vol. 87, no 1, 015010- p.Article in journal (Refereed) Published
Abstract [en]

A search for nonresonant new phenomena, originating from either contact interactions or large extra spatial dimensions, has been carried out using events with two isolated electrons or muons. These events, produced at the LHC in proton-proton collisions at root s = 7 TeV, were recorded by the ATLAS detector. The data sample, collected throughout 2011, corresponds to an integrated luminosity of 4.9 and 5.0 fb(-1) in the e(+)e(-) and mu(+)mu(-) channels, respectively. No significant deviations from the Standard Model expectation are observed. Using a Bayesian approach, 95% confidence level lower limits ranging from 9.0 to 13.9 TeV are placed on the energy scale of llqq contact interactions in the left-left isoscalar model. Lower limits ranging from 2.4 to 3.9 TeV are also set on the string scale in large extra dimension models. After combining these limits with results from a similar search in the diphoton channel, slightly more stringent limits are obtained.

Place, publisher, year, edition, pages
2013. Vol. 87, no 1, 015010- p.
Keyword [en]
Fermion-Pair Production, Parton Distributions, Compositeness Scales, E(+)E(-) Collisions, Standard Model, Cross-Section, Lep Energies, Physics, Quark, Hera
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-118098DOI: 10.1103/PhysRevD.87.015010ISI: 000313160300006Scopus ID: 2-s2.0-84872344345OAI: oai:DiVA.org:kth-118098DiVA: diva2:604737
Funder
Swedish Research Council
Note

QC 20130212. Author count: 2906

Available from: 2013-02-12 Created: 2013-02-12 Last updated: 2017-12-06Bibliographically approved

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Strandberg, Jonas

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