Search for Heavy Neutral Leptons in Decays of W Bosons Using a Dilepton Displaced Vertex in sqrt[s]=13  TeV pp Collisions with the ATLAS Detector

A search for a long-lived, heavy neutral lepton (N) in 139  fb^{-1} of sqrt[s]=13  TeV pp collision data collected by the ATLAS detector at the Large Hadron Collider is reported. The N is produced via W→Nμ or W→Ne and decays into two charged leptons and a neutrino, forming a displaced vertex. The N...

Descripción completa

Detalles Bibliográficos
Autores: Amos, K.R., Aparisi, Pozo, J.A., Bailey, A.J., Cabrera, Susana, Cantero, Josu, Cardillo, Fabio, Castillo Gimenez, M. V., Costa, María José, Didenko, Mariia, Escobar, Carlos, Fiorini, L., Fullana, Esteban, Fuster, Juan, García García, Carmen, García Navarro, José Enrique, Gomez Delegido, A.J., González de la Hoz, Santiago, Gonzalvo Rodríguez, Galo Rafael, Guerrero Rojas, J.G.R., Higón, Emilio, Lacasta Llácer, Carlos, Lozano Bahilo, José J., Martí García, Salvador, Martinez Agullo, Pablo, Miralles López, Marcos, Mitsou, Vasiliki A., Monsonis Romero, Luis, Moreno Llácer, María, Muñoz Perez, David, Navarro Gonzalez, Josep, Poveda, Joaquín, Prades Ibañez, Alberto, Rubio Jiménez, Adrián, Ruiz Martínez, Arantxa, Sabatini, Paolo, Salt, José, Sanchez Sebastian, Victoria, Sayago Galvan, Ivan, Senthilkumar, Varsha, Soldevila, Urmila, Sánchez Martínez, Javier, Torró Pastor, Emma, Valero, Alberto, Valls Ferrer, Juan Antonio, Varriale, Lorenzo, Villaplana Pérez, Miguel, Vos, Marcel, ATLAS Collaboration
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2023
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/360011
Acceso en línea:http://hdl.handle.net/10261/360011
Access Level:acceso abierto
Descripción
Sumario:A search for a long-lived, heavy neutral lepton (N) in 139  fb^{-1} of sqrt[s]=13  TeV pp collision data collected by the ATLAS detector at the Large Hadron Collider is reported. The N is produced via W→Nμ or W→Ne and decays into two charged leptons and a neutrino, forming a displaced vertex. The N mass is used to discriminate between signal and background. No signal is observed, and limits are set on the squared mixing parameters of the N with the left-handed neutrino states for the N mass range 3  GeV<m_{N}<15  GeV. For the first time, limits are given for both single-flavor and multiflavor mixing scenarios motivated by neutrino flavor oscillation results for both the normal and inverted neutrino-mass hierarchies.