A new method to distinguish hadronically decaying boosted Z bosons from W bosons using the ATLAS detector

The distribution of particles inside hadronic jets produced in the decay of boosted W and Z bosons can be used to discriminate such jets from the continuum background. Given that a jet has been identified as likely resulting from the hadronic decay of a boosted W or Z boson, this paper presents a te...

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Detalles Bibliográficos
Autores: Aad, G., Abbott, B., Abdallah, J., Abdinov, O., Aben, R., Alonso, F., Arduh, Francisco Anuar, Dova, Maria Teresa, Monticelli, Fernando Gabriel, Wahlberg, Hernan Pablo, Sacerdoti, Sabrina, Reisin, Hernan Diego, Piegaia, Ricardo Nestor, Otero y Garzon, Gustavo Javier, Zieminska, D., Zimine, N. I., Zimmermann, C., Zimmermann, S., Zinonos, Z., Zinser, M., Ziolkowski, M., Živkovic, L., Zobernig, G., Zoccoli, A., Nedden, M. zur, Zurzolo, G., Zwalinski, L., The ATLAS Collaboration
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2015
País:Argentina
Institución:Consejo Nacional de Investigaciones Científicas y Técnicas
Repositorio:CONICET Digital (CONICET)
Idioma:inglés
OAI Identifier:oai:ri.conicet.gov.ar:11336/51219
Acceso en línea:http://hdl.handle.net/11336/51219
Access Level:acceso abierto
Palabra clave:ATLAS experiment
boosted jets
jet composition
W/Z boson
https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
Descripción
Sumario:The distribution of particles inside hadronic jets produced in the decay of boosted W and Z bosons can be used to discriminate such jets from the continuum background. Given that a jet has been identified as likely resulting from the hadronic decay of a boosted W or Z boson, this paper presents a technique for further differentiating Z bosons from W bosons. The variables used are jet mass, jet charge, and a b-tagging discriminant. A likelihood tagger is constructed from these variables and tested in the simulation of W0 → WZ for bosons in the transverse momentum range 200 GeV < pT < 400 GeV in √ s = 8 TeV pp collisions with the ATLAS detector at the LHC. For Z-boson tagging efficiencies of Z = 90%, 50%, and 10%, one can achieve W+ -boson tagging rejection factors (1/ W+ ) of 1.7, 8.3 and 1000, respectively. It is not possible to measure these efficiencies in the data due to the lack of a pure sample of high pT, hadronically decaying Z bosons. However, the modelling of the tagger inputs for boosted W bosons is studied in data using a tt¯-enriched sample of events in 20.3 fb−1 of data at √ s = 8 TeV. The inputs are well modelled within uncertainties, which builds confidence in the expected tagger performance

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