Search for pair production of third-generation scalar leptoquarks decaying into a top quark and a τ-lepton in pp collisions at root √s = 13 TeV with the ATLAS detector

A search for pair production of third-generation scalar leptoquarks decaying into a top quark and a τ-lepton is presented. The search is based on a dataset of pp collisions at √s = 13 TeV recorded with the ATLAS detector during Run 2 of the Large Hadron Collider, corresponding to an integrated lumin...

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Detalles Bibliográficos
Autores principales: Alonso, Francisco, Dova, María Teresa, Hoya, Joaquín, Monticelli, Fernando Gabriel, Orellana, Gonzalo Enrique, Wahlberg, Hernán Pablo, The ATLAS Collaboration
Formato: Articulo
Lenguaje:Inglés
Publicado: 2021
Materias:
Ciencias Exactas
Física
Beyond Standard Model
Exotics
Hadron-Hadron scattering (experiments)
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/135835
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-135835
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Exactas
Física
Beyond Standard Model
Exotics
Hadron-Hadron scattering (experiments)
spellingShingle Ciencias Exactas
Física
Beyond Standard Model
Exotics
Hadron-Hadron scattering (experiments)
Alonso, Francisco
Dova, María Teresa
Hoya, Joaquín
Monticelli, Fernando Gabriel
Orellana, Gonzalo Enrique
Wahlberg, Hernán Pablo
The ATLAS Collaboration
Search for pair production of third-generation scalar leptoquarks decaying into a top quark and a τ-lepton in pp collisions at root √s = 13 TeV with the ATLAS detector
topic_facet Ciencias Exactas
Física
Beyond Standard Model
Exotics
Hadron-Hadron scattering (experiments)
description A search for pair production of third-generation scalar leptoquarks decaying into a top quark and a τ-lepton is presented. The search is based on a dataset of pp collisions at √s = 13 TeV recorded with the ATLAS detector during Run 2 of the Large Hadron Collider, corresponding to an integrated luminosity of 139 fb⁻¹. Events are selected if they have one light lepton (electron or muon) and at least one hadronically decaying τ -lepton, or at least two light leptons. In addition, two or more jets, at least one of which must be identified as containing b-hadrons, are required. Six final states, defined by the multiplicity and flavour of lepton candidates, are considered in the analysis. Each of them is split into multiple event categories to simultaneously search for the signal and constrain several leading backgrounds. The signal-rich event categories require at least one hadronically decaying τ-lepton candidate and exploit the presence of energetic final-state objects, which is characteristic of signal events. No significant excess above the Standard Model expectation is observed in any of the considered event categories, and 95% CL upper limits are set on the production cross section as a function of the leptoquark mass, for different assumptions about the branching fractions into tτ and bν. Scalar leptoquarks decaying exclusively into tτ are excluded up to masses of 1.43 TeV while, for a branching fraction of 50% into tτ, the lower mass limit is 1.22 TeV.
format Articulo
Articulo
author Alonso, Francisco
Dova, María Teresa
Hoya, Joaquín
Monticelli, Fernando Gabriel
Orellana, Gonzalo Enrique
Wahlberg, Hernán Pablo
The ATLAS Collaboration
author_facet Alonso, Francisco
Dova, María Teresa
Hoya, Joaquín
Monticelli, Fernando Gabriel
Orellana, Gonzalo Enrique
Wahlberg, Hernán Pablo
The ATLAS Collaboration
author_sort Alonso, Francisco
title Search for pair production of third-generation scalar leptoquarks decaying into a top quark and a τ-lepton in pp collisions at root √s = 13 TeV with the ATLAS detector
title_short Search for pair production of third-generation scalar leptoquarks decaying into a top quark and a τ-lepton in pp collisions at root √s = 13 TeV with the ATLAS detector
title_full Search for pair production of third-generation scalar leptoquarks decaying into a top quark and a τ-lepton in pp collisions at root √s = 13 TeV with the ATLAS detector
title_fullStr Search for pair production of third-generation scalar leptoquarks decaying into a top quark and a τ-lepton in pp collisions at root √s = 13 TeV with the ATLAS detector
title_full_unstemmed Search for pair production of third-generation scalar leptoquarks decaying into a top quark and a τ-lepton in pp collisions at root √s = 13 TeV with the ATLAS detector
title_sort search for pair production of third-generation scalar leptoquarks decaying into a top quark and a τ-lepton in pp collisions at root √s = 13 tev with the atlas detector
publishDate 2021
url http://sedici.unlp.edu.ar/handle/10915/135835
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