Production of vector leptoquarks at the LHC in association with a jet

dc.contributorFlórez Bustos, Carlos Andrés
dc.contributorÁvila Bernal, Carlos Arturo
dc.contributorGrupo de Fisica de Altas energias de la Universidad de los Andes
dc.creatorDorado Toro, Daniel Fernando
dc.date.accessioned2023-08-02T22:11:50Z
dc.date.accessioned2023-09-07T01:35:38Z
dc.date.available2023-08-02T22:11:50Z
dc.date.available2023-09-07T01:35:38Z
dc.date.created2023-08-02T22:11:50Z
dc.date.issued2022-06-08
dc.identifierhttp://hdl.handle.net/1992/69121
dc.identifierinstname:Universidad de los Andes
dc.identifierreponame:Repositorio Institucional Séneca
dc.identifierrepourl:https://repositorio.uniandes.edu.co/
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/8728487
dc.description.abstractThis dissertation presents a phenomenological study of vector leptoquark production under LHC conditions. The study considered a spin-1 leptoquark of charge +2/3 e coupling mainly to third-generation fermions. This choice is motivated by models that can explain the recently observed anomalies in B-meson decays. This work was carried out with high regard for constraints imposed by available low-energy observables. Using these constraints, signals for leptoquark production in association with a jet were simulated and events presenting a VBF-like process were selected. Background processes were also generated and their kinematic and topological distributions were compared to the signal samples. A logistic regression algorithm was trained and tested for classifying events as signal or background. With the classification by the algorithm, the search at the LHC for vector leptoquarks is feasible for leptoquark masses between 0.5 and 1.5 TeV and at high luminosities (between 1500 and 3000 fb^{-1}).
dc.description.abstractEsta tesis presenta un estudio fenomenológico de la producción de leptoquarks vectoriales en condiciones del LHC. El estudio considera un leptoquark de espín 1 de carga +2/3 e acoplado principalmente a fermiones de tercera generación. Esta elección está motivada por modelos que pueden explicar las anomalías recientemente observadas en las desintegraciones de mesones B. Este trabajo se llevó a cabo teniendo en cuenta las restricciones impuestas por los observables de baja energía disponibles. Utilizando estas restricciones, se simularon señales de producción de leptoquarks en asociación con un jet y se seleccionaron eventos que presentaban un proceso similar al de fusión de bosones vectoriales. También se generaron procesos de fondo y sus distribuciones cinemáticas y topológicas se compararon con las señales. Se entrenó y probó un algoritmo de regresión logística para clasificar los eventos como señal o ruido. Con la clasificación dada por el algoritmo, la búsqueda de leptoquarks vectoriales en el LHC es factible para masas entre 0.5 y 1.5 TeV y para altas luminosidades (entre 1500 y 3000 fb^{-1}).
dc.languageeng
dc.publisherUniversidad de los Andes
dc.publisherFísica
dc.publisherFacultad de Ciencias
dc.publisherDepartamento de Física
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dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 Internacional
dc.rightshttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.rightsinfo:eu-repo/semantics/openAccess
dc.rightshttp://purl.org/coar/access_right/c_abf2
dc.titleProduction of vector leptoquarks at the LHC in association with a jet
dc.typeTrabajo de grado - Pregrado


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