Search for excited electrons singly produced in proton-proton collisions at 13 TeV with the ATLAS experiment at the LHC

A search for excited electrons produced in pp collisions at 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 via a contact interaction into an elect...

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Detalles Bibliográficos
Autores: Aaboud, M., Aad, G., Abbott, B., Abbott, D. C., Abdinov, O., Abeloos, B., Abhayasinghe, D. K., Abidi, S. H., AbouZeid, O. S., Abraham, N. L., Abramowicz, H., Abreu, H., Abulaiti, Y., Acharya, B. S., Adachi, S., Adam, L., Adam Bourdarios, C., Adamczyk, L., Adamek, L., Adelman, J., Adersberger, M., Adiguzel, A., Adye, T., Affolder, A. A., Afik, Y., Agapopoulou, C., Agheorghiesei, C., Aguilar Saavedra, J. A., Ahmadov, F., Dova, Maria Teresa
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2019
País:Argentina
Institución:Consejo Nacional de Investigaciones Científicas y Técnicas
Repositorio:CONICET Digital (CONICET)
Idioma:inglés
OAI Identifier:oai:ri.conicet.gov.ar:11336/136631
Acceso en línea:http://hdl.handle.net/11336/136631
Access Level:acceso abierto
Palabra clave:LHC
ATLAS
https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
Descripción
Sumario:A search for excited electrons produced in pp collisions at 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 via a contact interaction 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.

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