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Search for light top squark pair production in final states with leptons and b-jets with the ATLAS detector in root s=7 TeV proton-proton collisions
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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2013 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 720, no 1-3, 13-31 p.Article in journal (Refereed) Published
Abstract [en]

The results of a search for pair production of light top squarks are presented, using 4.7 fb(-1) of root s = 7 TeV proton-proton collisions collected with the ATLAS detector at the Large Hadron Collider. This search targets top squarks with masses similar to, or lighter than, the top quark mass. Final states containing exclusively one or two leptons (e, mu), large missing transverse momentum, light-flavour jets and b-jets are used to reconstruct the top squark pair system. Event-based mass scale variables are used to separate the signal from a large t (t) over bar background. No excess over the Standard Model expectations is found. The results are interpreted in the framework of the Minimal Supersymmetric Standard Model, assuming the top squark decays exclusively to a chargino and a b-quark, while requiring different mass relationships between the Supersymmetric particles in the decay chain. Light top squarks with masses between 123-167 GeV are excluded for neutralino masses around 55 GeV.

Place, publisher, year, edition, pages
2013. Vol. 720, no 1-3, 13-31 p.
Keyword [en]
Supergauge Transformations, Supersymmetry, Model, Generators, Physics, Pions, Weak
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-121562DOI: 10.1016/j.physletb.2013.01.049ISI: 000316513500003OAI: oai:DiVA.org:kth-121562DiVA: diva2:619105
Funder
Swedish Research Council
Note

QC 20130502. Author count: 2910

Available from: 2013-05-02 Created: 2013-05-02 Last updated: 2017-12-06Bibliographically approved

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Strandberg, Jonas

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Jovicevic, JelenaKuwertz, EmmaLund-Jensen, BengtStrandberg, Jonas
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