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Tesis sobre el tema "Electroweak fit"

Autor: Grafiati
Publicado: 14 de diciembre de 2024

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1

Pinto, Pinoargote Andres. "Measurement of the W-Boson Mass with the ATLAS Detector at the LHC." Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASP057.

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Le présent travail montre l'état actuel de la mesure de la masse du boson W en utilisant les données du LHC en collisions proton-proton collectées par le détecteur ATLAS à 5.02, 7 et 13 TeV. Pour ce faire, des procédures de calibration dédiées du Détecteur Interne (DI) et du Spectromètre à Muons (SM) d'ATLAS ont été conçues et appliquées, et la stratégie de la mesure a été optimisée.La procédure de calibration du DI prend en compte les biais possibles dans la flèche de la trace du muon, les déformations géométriques et les distorsions du champ magnétique. Dans le cas du SM, les résidus d'align
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2

Tonero, Alberto. "Asymptotic safety and the electroweak interactions." Doctoral thesis, SISSA, 2012. http://hdl.handle.net/20.500.11767/4688.

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3

Menzel, Andreas. "Constraints on the Fourth-Generation Quark Mixing Matrix from Precision Flavour Observables." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät, 2017. http://dx.doi.org/10.18452/17711.

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Das Standardmodell einer zusätzlichen sequentiellen Fermiongeneration (SM4) war 2012 auf Basis eines Fits an elektroschwache Präzisionsobservable und die Higgs-Signalstärken mit einer Signifikanz von 5.3 sigma ausgeschlossen worden. Komplementär dazu wurden in der vorliegenden Arbeit Fits des SM4 an eine Kombination eines typischen Satzes von Flavour-Observablen mit den Ergebnissen des zuvor durchgeführten Elektroschwachen Präzisionsfits durchgeführt. Im SM3-Kontext extrahierte Größen wurden gemäß ihrer Bedeutung im SM4 reinterpretiert und die angepassten theoretischen Ausdrücke ange
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4

IACOBELLIS, Giuseppe. "Higgs connections: Electroweak Vacuum Stability and Cosmology." Doctoral thesis, Università degli studi di Ferrara, 2017. http://hdl.handle.net/11392/2487829.

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The discovery of the Higgs boson at LHC and the determination of its mass value have opened up the possibility to study the Standard Model (SM) up to very high energies, in order to probe the consistency of the theory and its range of validity, considering the model as an effective one. In this framework, equipped with the latest experimental data, a lot of interest has been devoted to the study of the stability of the SM electroweak vacuum and the peculiar implications both in particle physics and, mostly, in cosmology. Our work fits in this scenario with a two-fold aim: on one side, we try t
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5

Cacciapaglia, Giacomo. "Models of electroweak symmetry breaking in extra dimensions." Doctoral thesis, Scuola Normale Superiore, 2007. http://hdl.handle.net/11384/85850.

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6

Cárcamo, Hernández Antonio Enrique. "Composite Vectors and Scalars in Theories of Electroweak Symmetry Breaking." Doctoral thesis, Scuola Normale Superiore, 2011. http://hdl.handle.net/11384/85833.

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In the context of a strongly coupled Electroweak Symmetry Breaking, composite triplet of heavy vectors belonging to the SU(2)L+R adjoint representation and a composite scalar singlet under SU(2)L+R may arise from a new strong interaction invariant under the global SU(2)L x S(2)R symmetry, which is spontaneously broken down to SU(2)L+R. This thesis consists of two parts. The first part is devoted to the study of the heavy composite vector pair production at the LHC via Vector Boson Fusion and Drell-Yan annihilation under the assumption that the interactions among these heavy vector states
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7

Papucci, Michele. "Electroweak Symmetry Breaking with a compact extra dimension." Doctoral thesis, Scuola Normale Superiore, 2009. http://hdl.handle.net/11384/85837.

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[Excerpt from the preface]: During my Ph.D. course, under the supervision of Riccardo Barbieri, I started working on Theoretical High Energy Physics. In particular I focused on the problem of Electroweak Symmetry Breaking and in this context I investigated the bene ts of introducing a compact extra dimension. In a series of papers, together with Riccardo Barbieri, Guido Marandella, Lawrence Hall, Yasunori Nomura, Takemichi Okui and Steven Oliver I built supersymmetric models in 5D and studied their phenomenology in detail [1, 2, 3, 4]. In this models Supersymmetry is broken by boundary
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8

Macorini, Guido. "One loop electroweak corrections for single top production at LHC." Doctoral thesis, Università degli studi di Trieste, 2008. http://hdl.handle.net/10077/2708.

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2006/2007<br>In this thesis we report and discuss the results for the first complete calcula- tion of the one-loop electroweak corrections for the two dominant processes of single Top production at the Large Hadron Collider: the tW-associated pro- duction and the t-channel process. We calculate the corrections working both in the Standard Model (SM) and in the minimal supersymmetric extension of the Standard Model (MSSM, as- suming a mSUGRA scenario), analysing the effect of the corrections on several observables and trying to understand whether deviations from the Standard Model predi
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9

GRANATA, FEDERICO. "Electroweak and strong next-to-leading-order corrections to HV and HVj production at hadron colliders." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2017. http://hdl.handle.net/10281/158128.

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La scoperta del bosone di Higgs a LHC al CERN ha dato il via a un'era senza precedenti nel campo delle misure di precisione. In vista delle imminenti misure dai Run a 13 TeV di LHC è fondamentale avere previsioni accurate per processi che coinvolgono la produzione di un bosone di Higgs, per investigare a fondo il fenomeno di rottura spontanea della simmetria elettrodebole. Alle energie raggiunte da LHC, le correzioni dominanti provengono dal settore di QCD, in cui il primo ordine perturbativo (NLO) tipicamente dà contributi del 20-30% alla sezione d'urto. Le correzioni NLO elettrodeboli (EW),
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10

Panizzi, Luca. "One loop electroweak analysis for third family scalar quarks production at LHC." Doctoral thesis, Università degli studi di Trieste, 2009. http://hdl.handle.net/10077/3064.

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2007/2008<br>The thesis is devoted to the analysis of electroweak one-loop corrections to processes of production of scalar quarks of the third family at the Large Hadron Collider (LHC) in the context of the minimal supersymmetric extension of the Standard Model (MSSM). Third family squarks are are predicted to be among the lightest supersymmetric particles, hence they could be among the first signals of new physics to be detected at the LHC. Moreover, a very light stop (with a mass of the same order of the top mass) might play a relevant role within a cosmological model of electroweak baryog
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11

BALLABENE, ERIC. "SEARCH FOR ELECTROWEAK PRODUCTION OF SUPERSYMMETRIC PARTICLES IN COMPRESSED MASS SPECTRA WITH THE ATLAS DETECTOR AT THE LHC." Doctoral thesis, Università degli Studi di Milano, 2022. https://hdl.handle.net/2434/943307.

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In questa tesi, sono presentate due analisi che cercano la produzione di particelle supersimmetriche attraverso l'interazione elettrodebole: la ricerca di chargini, dove i chargini prodotti decadono in bosoni W e neutralini, e la ricerca di tracce displaced, ossia di tracce cariche spostate dal vertice di collisione primario, provenienti dai decadimenti di higgsini in pioni. Queste ricerche sono effettuate in spettri di massa compressi, dove la differenza di massa tra la particella subito più pesante di quella più leggera e quella più leggera è relativamente piccola. Queste ricerche usano dati
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12

CARRA, SONIA. "SEARCH FOR ELECTROWEAK PRODUCTION OF SUPERSYMMETRIC PARTICLES AT THE LHC RUN 2 WITH THE ATLAS DETECTOR." Doctoral thesis, Università degli Studi di Milano, 2019. http://hdl.handle.net/2434/608194.

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Two closely related searches for the electroweak production of Supersymmetric particles are presented in this manuscript. The analyses are based on the proton-proton collision data from the Large Hadron Collider Run 2, with a center-of-mass energy of 13 TeV, collected by the ATLAS experiment. Different Supersymmetric signal models are considered. The first search targets the pair production of either the Supersymmetric partners of the leptons (sleptons) or the $W$ boson and charged Higgs boson super-partners (charginos). In the latter case, the decay of charginos via sleptons is assumed. The
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13

Sestini, Lorenzo. "Search for a Higgs boson decaying to a pair of b quarks in the forward region of pp collisions with the LHCb detector." Doctoral thesis, Università degli studi di Padova, 2016. http://hdl.handle.net/11577/3423258.

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LHCb is a forward spectrometer (pseudorapidity coverage 2 < eta < 5) designed for heavy flavour physics, located at the Large Hadron Collider (LHC). Thanks to its unique features LHCb is able to perform electroweak and jets measurements in a complementary phase space with respect to the General Purpose Detectors (GPD) at LHC, ATLAS and CMS. In this thesis techniques to identify and reconstruct b b-bar resonances with the LHCb detector are developed. First the data collected by LHCb during the Run I data taking are analyzed to identify the Z -> b b-bar decay, to measure its cross section and
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14

Dong, Peter Joseph. "Measurement of electroweak single top quark production in proton-antiproton collisions at 1.96 TeV." Diss., Restricted to subscribing institutions, 2008. http://proquest.umi.com/pqdweb?did=1679373931&sid=1&Fmt=2&clientId=1564&RQT=309&VName=PQD.

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15

Dovier, Giacomo Oliviero. "Semi-inclusive associated bottom-Higgs production at LHC: the complete one-loop electroweak in the MSSM." Doctoral thesis, Università degli studi di Trieste, 2011. http://hdl.handle.net/10077/4815.

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2009/2010<br>Il bosone di Higgs il tassello mancante del Modello Standard: predetto da Peter Higgs negli anni sessanta, non ancora stato osservato sperimental- mente. Il Large Hadron Collider stato costruito con questo obiettivo in mente, assieme a molti altri. Uno dei processi pi interessanti per la pro- duzione di Higgs Supersimmetrico bg -> bH0 ( A0, h0). La natura dell'accoppiamento Yukawa nel MSSM lo rende predominate per alti valori di tan(beta) . In questa tesi vengono calcolate le correzioni elettrodeboli ad un loop alla sezione d'urto del processo nel MSSM, e viene mostrato co
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16

D'AGNOLO, RAFFAELE TITO. "Naturalness at the LHC." Doctoral thesis, Scuola Normale Superiore, 2013. http://hdl.handle.net/11384/85873.

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Particle physics is confronted by deep questions at the weak scale and the LHC can shed light on them. In this work we propose strategies to understand from its data if electroweak symmetry breaking is natural. We describe a search performed with the CMS detector in a yet unexplored area of natural LHC parameter space and we propose measurements in the Higgs boson sector that can discriminate between natural and unnatural theories
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17

Bellazzini, Brando. "The Higgs Boson from Extended Symmetries." Doctoral thesis, Scuola Normale Superiore, 2009. http://hdl.handle.net/11384/85838.

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Motivated by the desire to ameliorate the hierarchy problem without conflicting with electroweak precision tests, we investigate the idea that the Higgs doublet is a pseudo-Goldstone boson of an extended symmetry of the Standard Model. This thesis consists of two parts. The first chapter is devoted to an effective description of the phenomenology by means of a "minimal" SO(5) symmetry in the Higgs-top sector. We discuss the spectrum, electroweak precision tests, B-physics and naturalness of this model. We show the diffculty to comply with the different experimental constraints. In the
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18

CETORELLI, FLAVIA. "First observation of the electroweak production of a W+W- pair in association with two jets in the fully leptonic channel with the CMS detector at the LHC." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2022. http://hdl.handle.net/10281/369032.

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Questa tesi riporta la prima osservazione della produzione elettrodebole di una coppia di bosoni W+W- in associazione con due jet nello stato finale leptonico. L’analisi è stata svolta sui dati raccolti dal rivelatore CMS durante le collisioni p-p ad un’energia del centro di massa di 13 TeV, che si sono svolte al Large Hadron Collider (LHC) nel periodo 2016-2018. La produzione elettrodebole di due bosoni W+W- appartiene alla classe dei processi rari di vector boson scattering (VBS). Lo studio di processi VBS è uno degli obiettivi centrali di LHC, poiché sono direttamente connessi al bosone di
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19

Carrazza, S. "PARTON DISTRIBUTION FUNCTIONS WITH QED CORRECTIONS." Doctoral thesis, Università degli Studi di Milano, 2015. http://hdl.handle.net/2434/284820.

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We present the first unbiased determination of parton distribution functions (PDFs) with electroweak corrections. The aim of this thesis is to provide an exhaustive description of the theoretical framework and the technical implementation which leads to the determination of a set of PDFs which includes the photon PDF and quantum electrodynamics (QED) contributions to parton evolution. First, we introduce and motivate the need of including electroweak corrections to PDFs, providing phenomenological examples and presenting an overview of the current state of the art in PDF fits. The theoretical
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20

Buttazzo, Dario. "Implications of the discovery of a Higgs boson with a mass of 125 GeV." Doctoral thesis, Scuola Normale Superiore, 2013. http://hdl.handle.net/11384/85868.

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The discovery of a Higgs-like particle by the ATLAS and CMS experiments at the LHC has been a major event for particle physics. The rather precise knowledge of the mass of the Higgs boson and of its couplings to the other Standard Model elds has important consequences for the physical phenomena taking place at the Fermi scale of electroweak symmetry breaking. We will analyze some of these implications in the most motivated frameworks for physics at that scale { supersymmetry, models of a composite Higgs boson, and the Standard Model itself. At the same time, precision experiments in
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21

Lucente, Michele. "Implication of Sterile Fermions in Particle Physics and Cosmology." Doctoral thesis, SISSA, 2015. http://hdl.handle.net/20.500.11767/4803.

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The neutrino mass generation mechanism, the nature of dark matter and the origin of the baryon asymmetry of the Universe are three compelling questions that cannot be accounted for in the Standard Model of particle physics. In this thesis we focus on all these issues by providing a possible solution in terms of a minimal extension of the Standard Model, consisting in the addition of a set of sterile fermions to the field content of the theory. Sterile fermions are gauge singlet fields, that can interact via mixing with the active neutrinos. We focus on the Inverse Seesaw mechanism, which is ch
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22

Park, Kwangwoo. "Electroweak radiative corrections to neutrino-nucleon scattering." 2008. http://proquest.umi.com/pqdweb?did=1594490751&sid=4&Fmt=2&clientId=39334&RQT=309&VName=PQD.

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Thesis (Ph.D.)--State University of New York at Buffalo, 2008.<br>Title from PDF title page (viewed on Jan. 27, 2009) Available through UMI ProQuest Digital Dissertations. Thesis adviser: Wackeroth, Doreen, Baur, Ulrich Includes bibliographical references.
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