Search results for "Altas energías"
showing 10 items of 45 documents
Search for new physics in single-top-quark production with the ATLAS detector at the LHC
2018
Esta tesis presenta dos análisis dedicados a la búsqueda de nueva física en eventos de producción de quarks top únicos con datos recopilados por el detector ATLAS en el LHC. A pesar de su gran éxito, se cree que debe haber una teoría más general que subyace al Modelo Estándar de física de partículas que arroge luz a preguntas sin respuesta, como la asimetría de materia-antimateria del universo o la existencia de la Materia Oscura. Esta tesis cubre dos enfoques diferentes para abordar los dos temas anteriores. El objetivo del primer análisis es explorar la estructura del vértice Wtb a través de la medición de asimetrías angulares relacionadas con los observables de polarización del bosón W q…
Experiments and phenomenology of electric dipole moments
2022
The Standard Model (SM) is the best description of fundamental particles and their interactions we have to date. From this theory, all phenomena in the macroscopic world (except for gravity) can be explained, and it has successfully predicted all outcomes of particle experiments on Earth. However, cosmological observations of the early Universe yield a large imbalance between its content of matter and antimatter, which is several orders of magnitude above the SM prediction. To explain these observations, new interactions that do not respect the charge-parity symmetry must exist beyond the SM. Such interactions would induce electric dipole moments (EDMs) in known particles. In Part I of the …
Radiative neutrino masses: A window to new physics
2021
Currently, the Standard Model of particle physics (SM) is the best theory we have to describe particles and their interactions. However, there is evidence of physics beyond it, which motivates us to seek for a more complete theory. Neutrino oscillations constitute the first experimental confirmation of new physics, as they require a new piece that is absent in the SM, non-zero neutrino masses. Neutrino masses brought new theoretical challenges, for instance questions as how these masses are generated or why are they so small compared to other masses, are still under investigation. In this thesis, we aim to study radiative neutrino mass models, a class of models where small neutrino masses a…
Theory and phenomenology of Dirac neutrinos: Symmetry breaking patterns, flavour implications and Dark Matter
2021
El Modelo Estándar (SM en ingles) de interacciones Electro-Débiles (EW en inglés) ha sido un gran éxito desde un punto de vista teórico y experimental. Si bien este éxito no se puede negar, es hora de avanzar y abordar las preguntas que el SM deja sin respuesta, como las masas de neutrinos, la naturaleza de la materia oscura, el problema de la jerarquía o el problema de violación de CP en el sector de las interacciones fuertes, entre otros. De hecho, el SM predice neutrinos sin masa. Sin embargo, los experimentos de oscilación de neutrinos, que ahora alcanzan la era de la precisión, muestran claramente que al menos dos neutrinos son masivos y arrojan luz sobre su patrón de mezcla. Sin embar…
Neutrinos in GUTs and left right symmetry
2014
215 páginas. Tesis Doctoral del Departamento de Física Teórica de la Universidad de Valencia y del Instituto de Física Corpuscular (IFIC).
Ultra-High Energy Neutrinos at the Pierre Auger Observatory
2013
The observation of ultrahigh energy neutrinos (UHE nu s) has become a priority in experimental astroparticle physics. UHE nu s can be detected with a variety of techniques. In particular, neutrinos can interact in the atmosphere (downward-going nu) or in the Earth crust (Earth-skimming nu), producing air showers that can be observed with arrays of detectors at the ground. With the surface detector array of the Pierre Auger Observatory we can detect these types of cascades. The distinguishing signature for neutrino events is the presence of very inclined showers produced close to the ground (i.e., after having traversed a large amount of atmosphere). In this work we review the procedure and …
Discrete symmetries in entangled neutral meson systems
2013
223 páginas. Tesis Doctoral del Departamento de Física Atómica, Molecular y Nuclear de la Universidad de Valencia y del Instituto de Física Corpuscular (IFIC).
Phenomenology of massive neutrinos: from oscillations to new physics
2014
170 páginas. Tesis Doctoral del Departamento de Física Teórica de la Universidad de Valencia y del Instituto de Física Corpuscular (IFIC).
Aspects of physics beyond the standard model
2021
Emprant els diferents problemes del Model Estàndar com a guia, en esta tesi presente noves teories que milloren la nostra descripció de la natura al nivell més fonamental. En la primera part, després de revisitar el Model Estàndar, enumere i descric les raons que tenim per a sospitar de l'existència d'una teoria més fonamental. La parts dos, basada en diferents articles d'investigació, es centra en les possibles connexions entre l'orige de la massa del neutrí i la natura de la matèria fosca. Finalment, a la part tres, estudie en detall teories que permeten unificar les forces i explicar els diferents números quàntics dels fermions del Model Estàndar i, a més, explicar la replicació de les f…
First measurement of the charge asymmetry in boosted top quark pair production in the ATLAS experiment using the Grid-based Tier-3 facility at IFIC-V…
2016
The Large Hadron Collider (LHC) at CERN is the largest collider ever built. It is assembled in the same 27 km tunnel where Large Electron-Positron Collider (LEP) used to be, $\sim$ 100 m underground, near Geneva (Switzerland). The main interaction points have four experiments installed: ATLAS, CMS, ALICE and LHCb. The LHC is designed to collide two proton beams, that circulate in opposite directions, each with an energy of up to 7 TeV, reaching a centre-of-mass energy up to 14 TeV. %%%%%%%%% The ATLAS experiment is a general-purpose detector designed to exploit the potential of the LHC. With a total weight of 7000 tonnes, ATLAS is the heaviest experiment at the LHC. It has 42 m of total len…