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Title: Search for excited electrons singly produced in proton–proton collisions at $$\sqrt{s}$$ = 13 TeV with the ATLAS experiment at the LHC

Journal Article · · European Physical Journal. C, Particles and Fields
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A search for excited electrons produced in pp collisions at $$\sqrt{s}$$ = 13 TeV via a contact interaction $$q\overline{q}$$ → 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 ($$eq\overline{q}$$) 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*→$$eeq\overline{q}$$ and pp→ ee*→ eνW production cross sections as a function of the excited electron mass $$m_{e*}$$ at 95% confidence level. The limits are translated into lower bounds on the compositeness scale parameter Λ of the model as a function of $$m_{e*}$$. For $$m_{e*}$$ <0.5 TeV, the lower bound for Λ is 11 TeV. In the special case of $$m_{e*}$$=Λ, the values of $$m_{e*}$$< 4.8 TeV are excluded. The presented limits on Λ are more stringent than those obtained in previous searches.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Harvard Univ., Cambridge, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Contributing Organization:
ATLAS Collaboration
Grant/Contract Number:
AC02-05CH11231; SC0007881
OSTI ID:
1581361
Journal Information:
European Physical Journal. C, Particles and Fields, Journal Name: European Physical Journal. C, Particles and Fields Journal Issue: 9 Vol. 79; ISSN 1434-6044
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English

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