Search for excited electrons singly produced in proton–proton collisions at √s =13 TeV with the ATLAS experiment at the LHC

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  • ATLAS Collaboration

Colleges, School and Institutes


A search for excited electrons produced in pp collisions at √s = 13 TeV via a contact interaction qq¯ → ee is presented. The search uses 36.1 fb - 1 of data collected in 2015 and 2016 by the ATLAS experiment at the Large Hadron Collider. Decays of the excited electron into an electron and a pair of quarks (eqq¯) are targeted in final states with two electrons and two hadronic jets, and decays via a gauge interaction into a neutrino and a W boson (νW) are probed in final states with an electron, missing transverse momentum, and a large-radius jet consistent with a hadronically decaying W boson. No significant excess is observed over the expected backgrounds. Upper limits are calculated for the pp→ ee→ eeqq¯ and pp→ ee→ eνW production cross sections as a function of the excited electron mass me∗ at 95% confidence level. The limits are translated into lower bounds on the compositeness scale parameter Λ of the model as a function of me∗. For me∗<0.5 TeV, the lower bound for Λ is 11 TeV. In the special case of me∗=Λ, the values of me∗<4.8 TeV are excluded. The presented limits on Λ are more stringent than those obtained in previous searches.

Bibliographic note

45 pages in total, author list starting on page 29, 6 figures, 10 tables, published by Eur. Phys. J. C. All figures including auxiliary figures are available at


Original languageEnglish
Article number803
Pages (from-to)1-30
Number of pages30
JournalEuropean Physical Journal C
Issue number9
Publication statusPublished - 26 Sep 2019


  • hep-ex