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Search for New Phenomena in t(t)overbar Events with Large Missing Transverse Momentum in Proton-Proton Collisions at root s = 7 TeV with the ATLAS Detector
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.ORCID iD: 0000-0002-8913-0981
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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2012 (English)In: Physical Review Letters, ISSN 0031-9007, Vol. 108, no 4, 041805- p.Article in journal (Refereed) Published
Abstract [en]

A search for new phenomena in t (t) over bar events with large missing transverse momentum in proton-proton collisions at a center-of-mass energy of 7 TeV is presented. The measurement is based on 1: 04 fb(-1) of data collected with the ATLAS detector at the LHC. Contributions to this final state may arise from a number of standard model extensions. The results are interpreted in terms of a model where new top-quark partners are pair produced and each decay to an on-shell top (or antitop) quark and a long-lived undetected neutral particle. The data are found to be consistent with standard model expectations. A limit at 95% confidence level is set excluding a cross section times branching ratio of 1.1 pb for a top-partner mass of 420 GeVand a neutral particle mass less than 10 GeV. In a model of exotic fourth generation quarks, toppartner masses are excluded up to 420 GeV and neutral particle masses up to 140 GeV.

Place, publisher, year, edition, pages
American Physical Society , 2012. Vol. 108, no 4, 041805- p.
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:kth:diva-84558DOI: 10.1103/PhysRevLett.108.041805ISI: 000299828100003Scopus ID: 2-s2.0-84862852197OAI: oai:DiVA.org:kth-84558DiVA: diva2:499444
Note
QC 20120214Available from: 2012-02-13 Created: 2012-02-13 Last updated: 2012-03-08Bibliographically approved

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Strandberg, Jonas

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