Reconstruction and identification of boosted di-τ systems in a search for Higgs boson pairs using 13 TeV proton-proton collision data in ATLAS

In this paper, a new technique for reconstructing and identifying hadronically decaying ττ pairs with a large Lorentz boost, referred to as the di-τ tagger, is developed and used for the first time in the ATLAS experiment at the Large Hadron Collider. A benchmark di-τ tagging selection is employed i...

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Detalles Bibliográficos
Autores: ATLAS Collaboration, Aparisi Pozo, J.A., Bailey, A.J., Cabrera, Susana, Castillo, F.L., Castillo Gimenez, M. V., 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, Gonzalvo Rodríguez, Galo Rafael, Guerrero Rojas, J.G.R., Higón, Emilio, Lacasta Llácer, Carlos, Lozano Bahilo, José J., Madaffari, Daniele, Mamuzic, Judita, Martí García, Salvador, Martinez Agullo, Pablo, Mitsou, Vasiliki A., Moreno Llácer, María, Poveda, Joaquín, Rodriguez Rodriguez, D., Rodriguez Bosca, S., Ruiz Martínez, Arantxa, Salt, José, Santra, A, Sayago Galvan, Ivan, Soldevila, Urmila, Sánchez Martínez, Javier, Valero, Alberto, Valls Ferrer, Juan Antonio, Vos, Marcel
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:dnet:digitalcsic_::fc9e40c00fcd8aa4ecc8dbe93982398f
Acceso en línea:http://hdl.handle.net/10261/233036
Access Level:acceso abierto
Palabra clave:ddc:530
Descripción
Sumario:In this paper, a new technique for reconstructing and identifying hadronically decaying ττ pairs with a large Lorentz boost, referred to as the di-τ tagger, is developed and used for the first time in the ATLAS experiment at the Large Hadron Collider. A benchmark di-τ tagging selection is employed in the search for resonant Higgs boson pair production, where one Higgs boson decays into a boosted bb¯ pair and the other into a boosted ττ pair, with two hadronically decaying τ-leptons in the final state. Using 139 fb of proton-proton collision data recorded at a centre-of-mass energy of 13 TeV, the efficiency of the di-τ tagger is determined and the background with quark- or gluon-initiated jets misidentified as di-τ objects is estimated. The search for a heavy, narrow, scalar resonance produced via gluon-gluon fusion and decaying into two Higgs bosons is carried out in the mass range 1–3 TeV using the same dataset. No deviations from the Standard Model predictions are observed, and 95% confidence-level exclusion limits are set on this model. [Figure not available: see fulltext.].

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