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

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 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...

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Detalles Bibliográficos
Autores: ATLAS Collaboration, Álvarez Piqueras, D., Aparisi Pozo, J.A., Bailey, A.J., Barranco, Laura, Cabrera, Susana, Castillo, F.L., Castillo Gimenez, M. V., Cerda Alberich, L., Costa, María José, Escobar, Carlos, Estrada, Oscar, Ferrer, Antonio, Fiorini, L., Fullana, Esteban, Fuster, Juan, García García, Carmen, García Navarro, José Enrique, González de la Hoz, Santiago, Guerrero Rojas, J.G.R., Gonzalvo Rodríguez, Galo Rafael, Higón, Emilio, Jimenez Pena, Javier, Lacasta Llácer, Carlos, Lozano Bahilo, José J., Madaffari, Daniele, Mamuzic, Judita, Martí García, Salvador, Melini, Davide, Miñano Moya, M., Mitsou, Vasiliki A., Rodriguez Bosca, S., Rodriguez Rodriguez, D., Ruiz Martínez, Arantxa, Salt, José, Santra, A., Sánchez Martínez, Javier, Soldevila, Urmila, Valero, Alberto, Valls Ferrer, Juan Antonio, Vos, Marcel
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2019
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/208893
Acceso en línea:http://hdl.handle.net/10261/208893
Access Level:acceso abierto
Palabra clave:ddc:500.2
Descripción
Sumario: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 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.