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

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Article number803
<mark>Journal publication date</mark>26/09/2019
<mark>Journal</mark>European Physical Journal D
Issue number9
Number of pages30
Publication StatusPublished
<mark>Original language</mark>English


A search for excited electrons produced in pp collisions at s = 13 Te 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∗