Search for light long-lived neutral particles produced in pp collisions at √s=13TeV and decaying into collimated leptons or light hadrons with the ATLAS detector

Several models of physics beyond the Standard Model predict the existence of dark photons, light neutral particles decaying into collimated leptons or light hadrons. This paper presents a search for long-lived dark photons produced from the decay of a Higgs boson or a heavy scalar boson and decaying...

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Detalles Bibliográficos
Autores: ATLAS Collaboration, Álvarez Piqueras, D., Aparisi Pozo, J.A., Barranco, Laura, Cabrera, Susana, Castillo, F.L., Castillo Gimenez, M. V., Cerda Alberich, L., Costa, María José, Estrada, Oscar, Ferrer, Antonio, Fiorini, L., Fuster, Juan, Fullana, Esteban, García García, Carmen, García Navarro, José Enrique, González de la Hoz, Santiago, Guerrero Rojas, J.G.R., Higón, Emilio, Lacasta Llácer, Carlos, Lozano Bahilo, José J., Madaffari, Daniele, Mamuzic, Judita, Martí García, Salvador, Melini, Davide, Mitsou, Vasiliki A., Moreno Llácer, María, Miñano Moya, M., Rodriguez Rodriguez, D., Rodriguez Bosca, S., Ruiz Martínez, Arantxa, Salt, José, Santra, A, Soldevila, Urmila, Sánchez Martínez, Javier, Valero, Alberto, Valls Ferrer, Juan Antonio, Vos, Marcel, Bailey, A.J.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2020
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/232568
Acceso en línea:http://hdl.handle.net/10261/232568
Access Level:acceso abierto
Palabra clave:ddc:530
Descripción
Sumario:Several models of physics beyond the Standard Model predict the existence of dark photons, light neutral particles decaying into collimated leptons or light hadrons. This paper presents a search for long-lived dark photons produced from the decay of a Higgs boson or a heavy scalar boson and decaying into displaced collimated Standard Model fermions. The search uses data corresponding to an integrated luminosity of 36.1 fb collected in proton–proton collisions at s=13 Te recorded in 2015–2016 with the ATLAS detector at the Large Hadron Collider. The observed number of events is consistent with the expected background, and limits on the production cross section times branching fraction as a function of the proper decay length of the dark photon are reported. A cross section times branching fraction above 4 pb is excluded for a Higgs boson decaying into two dark photons for dark-photon decay lengths between 1.5 mm and 307 mm.