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DIGITAL.CSIC
Doctoral thesis . 2015 . Peer-reviewed
Data sources: DIGITAL.CSIC
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Determination of the top-quark pole mass using tt+1-jet events with the ATLAS detector at the LHC

Authors: Irles Quiles, Adrián;

Determination of the top-quark pole mass using tt+1-jet events with the ATLAS detector at the LHC

Abstract

Esta tesis está basada en el estudio del quark top y, especificamente, de su masa. ¿Por qué el quark top? ¿Por qué su masa? El quark top es la partícula más pesada del ME: su masa es alrededor de 35 veces la masa del segundo quark más pesado (el quark bottom). Ese valor tan grande de la masa, además, le confiere una característica que lo diferencia de los otros quarks: se desintegra antes de que el proceso de hadronización pueda tener lugar. Además, el quark top posee el mayor acoplamiento con el bosón de Higgs. Por esto mismo el quark top juega un papel especial en la teoría de las interacciones electrodébiles: debido al gran valor de su masa, el quark top introduce enromes correcciones en los cálculos teóricos. Es por eso que la medida de las propiedades del quark top y en concreto de su masa es fundamental. Actualmente, las mejores medidas de la masa del quark top alcanzan precisiones de $\sim 0.5 \simeq 0.8~\GeV$ o incluso menores al combinar varias. Los métodos con menor incertidumbre experimental se basan en la medida de la masa del quark top a través de las propiedades cinemáticas de sus productos de desintegración (las llamadas medidas directas de la masa del quark top o medidas de la masa cinemática del quark top). El problema de este método es que tiene una incertidumbre aun desconocida (y que se ha estimado que podría ser del orden de $1~\GeV$~\cite{Hoang:2008xm,Moch:2014tta}) cuando se interpreta esta masa como la masa polo del quark top (la masa equivalente a la masa definida por el cuadrimomento de una partícula libre). Es, por lo tanto, crucial buscar nuevos y alternativos métodos para medir la masa.

180 páginas. Tesis Doctoral del Departamento de Física Atómica, Molecular y Nuclear de la Universidad de Valencia, del Instituto de Física Corpuscular (IFIC) en Valencia y del Institut für Physik-Humboldt-Universität zu Berlin.

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Spain
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Keywords

quark, :FÍSICA::Física de altas energías [UNESCO], pole, UNESCO::FÍSICA::Física de altas energías, mass, atlas, lhc, qcd, nlo, top quark

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This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
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