In:
The European Physical Journal C, Springer Science and Business Media LLC, Vol. 79, No. 9 ( 2019-09)
Abstract:
A search for excited electrons produced in pp collisions at $$\sqrt{s}$$ s = 13 $$\text {Te}\text {V}$$ Te via a contact interaction $$q{\bar{q}}\rightarrow ee^*$$ q q ¯ → e e ∗ is presented. The search uses 36.1 fb $$^{-1}$$ - 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 ( $$eq{\bar{q}}$$ e q q ¯ ) are targeted in final states with two electrons and two hadronic jets, and decays via a gauge interaction into a neutrino and a $$W$$ W boson ( $$\nu W$$ ν W ) are probed in final states with an electron, missing transverse momentum, and a large-radius jet consistent with a hadronically decaying $$W$$ W boson. No significant excess is observed over the expected backgrounds. Upper limits are calculated for the $$pp \rightarrow ee^*\rightarrow eeq{\bar{q}} $$ p p → e e ∗ → e e q q ¯ and $$pp \rightarrow ee^*\rightarrow e\nu W $$ p p → e e ∗ → e ν W production cross sections as a function of the excited electron mass $$m_{e^*}$$ m e ∗ at 95% confidence level. The limits are translated into lower bounds on the compositeness scale parameter $$\Lambda $$ Λ of the model as a function of $$m_{e^*}$$ m e ∗ . For $$m_{e^*} 〈 0.5$$ m e ∗ 〈 0.5 $$\text {Te}\text {V}$$ Te , the lower bound for $$\Lambda $$ Λ is 11 $$\text {Te}\text {V}$$ Te . In the special case of $$m_{e^*} =\Lambda $$ m e ∗ = Λ , the values of $$m_{e^*} 〈 4.8$$ m e ∗ 〈 4.8 $$\text {Te}\text {V}$$ Te are excluded. The presented limits on $$\Lambda $$ Λ are more stringent than those obtained in previous searches.
Type of Medium:
Online Resource
ISSN:
1434-6044
,
1434-6052
DOI:
10.1140/epjc/s10052-019-7295-1
Language:
English
Publisher:
Springer Science and Business Media LLC
Publication Date:
2019
detail.hit.zdb_id:
1397769-6
detail.hit.zdb_id:
1459069-4
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