Search for excited electrons and muons in root s=8 TeV proton-proton collisions with the ATLAS detector
2013 (English)In: New Journal of Physics, ISSN 1367-2630, Vol. 15, 093011- p.Article in journal (Refereed) Published
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.
IdentifiersURN: urn:nbn:se:uu:diva-209527DOI: 10.1088/1367-2630/15/9/093011ISI: 000324073000001OAI: oai:DiVA.org:uu-209527DiVA: diva2:658328
ATLAS Collaboration, for complete list of authors see http://dx.doi.org/10.1088/1367-2630/15/9/0930112013-10-212013-10-212013-10-21Bibliographically approved