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Título: | Search for the Production of a Long-Lived Neutral Particle Decaying within the ATLAS Hadronic Calorimeter in Association with a Z Boson from pp Collisions at s =13 TeV |
Autor: | Álvarez Piqueras, D. CSIC ORCID; Aparisi Pozo, J.A.; Bailey, A.J.; Barranco, Laura; Cabrera, Susana CSIC ORCID; Castillo, F.L.; Castillo Mª Victoria; Cerda Alberich, L.; Costa, María José CSIC ORCID; Escobar, Carlos CSIC ORCID ; Estrada, Oscar; Ferrer, Antonio CSIC ORCID; Fiorini, L. CSIC ORCID; Fullana, Esteban CSIC ORCID; Fuster, Juan CSIC ORCID; García García, Carmen CSIC ORCID; García Navarro, José Enrique CSIC ORCID; González de la Hoz, Santiago CSIC ORCID CVN; Higón, Emilio CSIC ORCID; Jimenez Pena, Javier; Lacasta Llácer, Carlos CSIC ORCID ; Lozano Bahilo, José J.; Madaffari, Daniele CSIC ORCID; Mamuzic, Judita; Martí García, Salvador; Melini, Davide; Miñano Moya, M.; Mitsou, Vasiliki A. CSIC ORCID ; Rodriguez Bosca, S.; Rodriguez Rodriguez, D. CSIC; Ruiz Martínez, Arantxa CSIC ORCID; Salt, José CSIC ORCID; Santra, A.; Sánchez Martínez, Javier CSIC ORCID; Soldevila, Urmila CSIC ORCID; Valero, Alberto CSIC ORCID; Valls Ferrer, Juan Antonio CSIC ORCID; Vos, Marcel CSIC ORCID; ATLAS Collaboration | Fecha de publicación: | abr-2019 | Editor: | American Physical Society | Citación: | Physical Review Letters 122 (2019) | Resumen: | This Letter presents a search for the production of a long-lived neutral particle (Zd) decaying within the ATLAS hadronic calorimeter, in association with a standard model (SM) Z boson produced via an intermediate scalar boson, where Z→+ (=e, μ). The data used were collected by the ATLAS detector during 2015 and 2016 pp collisions with a center-of-mass energy of s=13 TeV at the Large Hadron Collider and correspond to an integrated luminosity of 36.1±0.8 fb-1. No significant excess of events is observed above the expected background. Limits on the production cross section of the scalar boson times its decay branching fraction into the long-lived neutral particle are derived as a function of the mass of the intermediate scalar boson, the mass of the long-lived neutral particle, and its cτ from a few centimeters to one hundred meters. In the case that the intermediate scalar boson is the SM Higgs boson, its decay branching fraction to a long-lived neutral particle with a cτ approximately between 0.1 and 7 m is excluded with a 95% confidence level up to 10% for mZd between 5 and 15 GeV. | Versión del editor: | http://dx.doi.org/10.1103/PhysRevLett.122.151801 | URI: | http://hdl.handle.net/10261/205101 | DOI: | 10.1103/PhysRevLett.122.151801 | Identificadores: | doi: 10.1103/PhysRevLett.122.151801 issn: 1079-7114 |
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