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Search for excited electrons and muons in root s=8 TeV proton-proton collisions 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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2013 (English)In: New Journal of Physics, ISSN 1367-2630, E-ISSN 1367-2630, Vol. 15, 093011- p.Article in journal (Refereed) Published
Abstract [en]

The ATLAS detector at the Large Hadron Collider is used to search for excited electrons and excited muons in the channel pp -> ll* -> ll gamma, assuming that excited leptons are produced via contact interactions. The analysis is based on 13 fb(-1) of pp collisions at a centre-of-mass energy of 8 TeV. No evidence for excited leptons is found, and a limit is set at the 95% credibility level on the cross section times branching ratio as a function of the excited-lepton mass m(l*). For m(l*) >= 0.8 TeV, the respective upper limits on sigma B(l(*) -> l gamma) are 0.75 and 0.90 fb for the e* and mu* searches. Limits on sigma B are converted into lower bounds on the compositeness scale 3. In the special case where Lambda = m(l*), excited-electron and excited-muon masses below 2.2 TeV are excluded.

Place, publisher, year, edition, pages
2013. Vol. 15, 093011- p.
Keyword [en]
Lepton Production, EP Collisions, Hera, Quark
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-131752DOI: 10.1088/1367-2630/15/9/093011ISI: 000324073000001Scopus ID: 2-s2.0-84885144603OAI: oai:DiVA.org:kth-131752DiVA: diva2:656902
Funder
Swedish Research Council
Note

QC 20131017. Author count: 2936

Available from: 2013-10-17 Created: 2013-10-17 Last updated: 2017-12-06Bibliographically approved

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Strandberg, Jonas

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