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" Search for excited electrons singly produced in proton–proton collisions at √s=13Te with the ATLAS experiment at the LHC "
Aaboud, MAad, GAbbott, BAbbott, DCAbdinov, OAbeloos, BAbhayasinghe, DKAbidi, SHAbouZeid, OSAbraham, NLAbramowicz, HAbreu, HAbulaiti, YAcharya, BSAdachi, SAdam, LBourdarios, CAAdamczyk, LAdamek, LAdelman, JAdersberger, MAdiguzel, AAdye, TAffolder, AAAfik, Yet al.
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AL
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| Record Number
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902777
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LA3tr8m09z
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| Title & Author
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Search for excited electrons singly produced in proton–proton collisions at √s=13Te with the ATLAS experiment at the LHC [Article]\ Aaboud, MAad, GAbbott, BAbbott, DCAbdinov, OAbeloos, BAbhayasinghe, DKAbidi, SHAbouZeid, OSAbraham, NLAbramowicz, HAbreu, HAbulaiti, YAcharya, BSAdachi, SAdam, LBourdarios, CAAdamczyk, LAdamek, LAdelman, JAdersberger, MAdiguzel, AAdye, TAffolder, AAAfik, Yet al.
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2019
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Lawrence Berkeley National Laboratory
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| Abstract
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© 2019, CERN for the benefit of the ATLAS collaboration. 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∗<0.5 Te, the lower bound for Λ is 11 Te. In the special case of me∗=Λ, the values of me∗<4.8 Te are excluded. The presented limits on Λ are more stringent than those obtained in previous searches.
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