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Littérature scientifique sur le sujet « Bosone di Higg »

Auteur : Grafiati
Publié le 9 mars 2023
Mis à jour le 10 mars 2023

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Articles de revues sur le sujet "Bosone di Higg"

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Paraskevopoulos, Christos. « Measurement of the Higgs quartic coupling c 2 v from di-Higgs Vector Boson Fusion in the bb¯τ+τ− channel ». Journal of Physics : Conference Series 2375, no 1 (1 novembre 2022) : 012009. http://dx.doi.org/10.1088/1742-6596/2375/1/012009.

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Abstract The Brout Englert Higgs (BEH) mechanism of electroweak symmetry breaking and mass generation was experimentally confirmed after the discovery of the Higgs boson at the Large Hadron Collider in 2012. The BEH mechanism not only predicts the existence of a massive scalar particle, but also requires this scalar particle to couple to itself. Double Higgs production provides a unique handle, since it allows the extraction of the trilinear Higgs self-coupling. VBF di-Higgs production also probes the quartic Higgs bosons to vector bosons coupling (c 2 v). In this topic the effort on setting constraints on c 2 v will be discussed. Event selection and reconstruction will be illustrated as well as a Neural Network designed to identify VBF events.
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Flacke, Thomas. « Searching for composite Higgs models at the LHC ». International Journal of Modern Physics A 31, no 19 (7 juillet 2016) : 1630026. http://dx.doi.org/10.1142/s0217751x1630026x.

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Composite Higgs models have the potential to provide a solution to the hierarchy problem and a dynamical explanation for the generation of the Higgs potential. They can be tested at the LHC as the new sector which underlies electroweak symmetry breaking must become strong in the TeV regime, which implies additional bound states beyond the Higgs. In this paper, we first discuss prospects and search strategies for top partners (and other quark partners) in the strongly coupled sector, which we study in an effective field theory setup. In the second part of the proceedings, we go beyond the effective field theory approach. We discuss potential UV embeddings for composite Higgs models which contain a Higgs as well as top partners. We show that in all of these models, additional pseudo-Nambu–Goldstone bosons beyond the Higgs are present. In particular, all of the models contain a pseudoscalar which couples to the Standard Model gauge fields through Wess–Zumino–Witten terms, providing a prime candidate for a di-boson (including a di-photon) resonance. The models also contain colored pNGBs which can be searched for at the LHC.
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Maravin, Yurii Y. « DI-BOSON PHYSICS AT THE TEVATRON ». International Journal of Modern Physics A 20, no 15 (20 juin 2005) : 3253–57. http://dx.doi.org/10.1142/s0217751x05026273.

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Using almost twice the luminosity of Run I, we present preliminary results on di-boson final states production at the Tevatron. These results include cross section measurements of most di-boson final states including the first measurement of WW cross section.
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Kuday, S., H. Saygın, İ. Hoş et F. Çetin. « Projections for neutral Di-Boson and Di-Higgs interactions at FCC-he collider ». Nuclear Physics B 932 (juillet 2018) : 1–14. http://dx.doi.org/10.1016/j.nuclphysb.2018.05.002.

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Pierce, Aaron, Jesse Thaler et Lian-Tao Wang. « Disentangling dimension six operators through di-Higgs boson production ». Journal of High Energy Physics 2007, no 05 (21 mai 2007) : 070. http://dx.doi.org/10.1088/1126-6708/2007/05/070.

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Madar, Romain. « Search for fermionic Higgs boson decays in pp collisions at the ATLAS and CMS experiments ». International Journal of Modern Physics : Conference Series 31 (janvier 2014) : 1460287. http://dx.doi.org/10.1142/s2010194514602877.

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The newly discovered boson was only observed in diboson final states. The measurement of the fermionic decay modes of this new particle is essential to establish its compatibility with the Standard Model Higgs boson. The two main final states accessible at the LHC are the decay into pairs of b quarks and τ leptons, both of which are experimentally challenging. In some cases, the exploitation of specific Higgs boson production modes allows to significantly increase the experimental sensitivity. One can also extend the search by looking for di-muon final states. This article gives an overview of the Higgs boson searches in these three fermionic final states at the ATLAS and CMS experiments, focusing on the most recent developments and results.
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Madar, Romain. « Search for fermionic Higgs boson decays in pp collisions at the ATLAS and CMS experiments ». International Journal of Modern Physics A 29, no 26 (16 octobre 2014) : 1430055. http://dx.doi.org/10.1142/s0217751x14300555.

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The newly discovered boson was only observed in diboson final states. The measurement of the fermionic decay modes of this new particle is essential to establish its compatibility with the Standard Model Higgs boson. The two main final states accessible at the LHC are the decay into pairs of b quarks and τ leptons, both of which are experimentally challenging. In some cases, the exploitation of specific Higgs boson production modes allows to significantly increase the experimental sensitivity. One can also extend the search by looking for di-muon final states. This article gives an overview of the Higgs boson searches in these three fermionic final states at the ATLAS and CMS experiments, focusing on the most recent developments and results.
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Trifyllis, Lampros. « The Higgs di-photon decay in the standard model effective field theory ». Facta universitatis - series : Physics, Chemistry and Technology 17, no 1, spec.issue (2019) : 89–96. http://dx.doi.org/10.2298/fupct1901089t.

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Starting from the Standard Model (SM) of elementary particle physics, we assume that new physics effects can be encoded in higher-dimensional operators added in the SM Lagrangian. The resulting theory, the SM Effective Field Theory (SMEFT), is then used for high-accuracy phenomenological studies. Through this paper, the di-photon decay of the Higgs boson is used as a sample of a concrete calculation in the SMEFT framework.
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Lü, Lan-Chun, Chun Du, Yaquan Fang, Hong-Jian He et Huijun Zhang. « Searching heavier Higgs boson via di-Higgs production at LHC Run-2 ». Physics Letters B 755 (avril 2016) : 509–22. http://dx.doi.org/10.1016/j.physletb.2016.02.026.

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Brigljević, V., D. Ferenček, S. Morović, M. Planinić, S. Beauceron, S. Ganjour, G. Hamel de Monchenault et al. « Study of di-boson production with the CMS detector at LHC ». Journal of Physics G : Nuclear and Particle Physics 34, no 7 (30 mai 2007) : N269—N295. http://dx.doi.org/10.1088/0954-3899/34/7/n01.

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Thèses sur le sujet "Bosone di Higg"

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CIRIOLO, VINCENZO. « Study of the Higgs boson associated production with a vector boson in the Higgs boson diphoton decay channel with the CMS detector ». Doctoral thesis, Università degli Studi di Milano-Bicocca, 2019. http://hdl.handle.net/10281/241085.

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Questa tesi di dottorato presenta lo studio della produzione associata di un bosone di Higgs con un bosone vettore (VH) in collisioni protone-protone, utilizzando i dati raccolti ad un'energia nel centro di massa delle collisioni pari a 13 TeV con l'esperimento CMS nel 2016. Questo studio è ristretto allo stato finale dove il boson di Higgs decade in due fotoni. Dopo un'introduzione riguardante il contesto teorico e sperimentale che motiva questo studio (Capitolo 1) e una descrizione generale dell'esperimento CMS (Capitolo 2), il lavoro sperimental necessario per ottenere exxellenti performance dal calorimetro eletromagnetico di CMS sono descritti in dettaglio (Capitolo 4). Le utilizzate nell'analisi dei dati e i risultati sono descritti nel capitolo 4, includendo la discussione dell'ottimizzazione dell'analisi che sono stati ritenuti benefici per gli sviluppi futuri. In particolare, il canale in cui il bosone vettore decade in due quark a quello in cui il bosone W decade leptonicamente sono descritti. I risultati dell'analisi sono inclusi in un articolo recentemente sottomesso per la pubblicazione su una rivista internazionale, rappresentando i primi risultati della misura della produzione VH nel canale H→ γγ con dati raccolti nel Run 2 di LHC.
This Ph.D. thesis presents a study of the associated production of the Higgs boson with a vector boson (VH) in proton-proton collisions, using data collected at a center-of-mass energy of 13 TeV with the CMS experiment in 2016 for an integrated luminosity of 35.9 fb −1 . The study is restricted to final states were the Higgs boson decays in two photons (H→ γγ). After an introduction on the experimental and theoretical landscape that motivates this study (Chapter 1) and an overview of the CMS experiment (Chapter 2), the exper- imental work performed to ensure the best quality of the CMS ECAL reconstruction is described in detail (Chapter 3). The analysis method and the results are then described (Chapter 4), including the discussion of optimization steps that were identified and will be relevant for future developments. In particular, the channels with the vector boson decaying into a pair of quarks and the W boson decaying into a lepton and a neutrino are described This analysis, included in a paper recently submitted for publication, represents the first result on the measurement of the VH production process in the H→ γγ final state with the LHC Run 2 data.
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Courbon, Benoit. « Reconstruction des photons et recherche d’un second boson de Higgs dans le canal di-photon au sein de l’expérience CMS au LHC ». Thesis, Lyon, 2016. http://www.theses.fr/2016LYSE1187/document.

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Une particule compatible avec le boson de Higgs du modèle standard de la physique des particules a été découverte au grand collisionneur de hadrons (LHC) en juillet 2012 par les expériences Atlas et CMS. A ce jour, l'ensemble des mesures des couplages de ce boson de Higgs sont compatibles avec ceux prédits par le modèle standard. Toutefois le modèle standard possède des limitations et d'autres théories, telles la supersymétrie, ont été bâties afin de pallier à ces manques. Certaines de ces théories prédisent en particulier un secteur scalaire enrichi avec la présence de bosons de Higgs additionnels.D'un point de vue expérimental, le canal de désintégration du boson de Higgs en deux photons offre une signature claire et permet d'explorer le secteur de Higgs avec une grande précision. Les travaux présentés dans cette thèse ont été effectués dans le cadre de l'expérience CMS au LHC.La première partie est dédiée à l'étude de la reconstruction expérimentale des photons. Tout d'abord, une méthode de correction en énergie des photons est exposée. Puis des prospectives concernant l'évolution de la qualité de leur reconstruction avec le vieillissement du détecteur sont présentées.La deuxième partie fait l'objet de la recherche d'un second boson de Higgs de basse masse(en dessous de 110 GeV) dans le canal di-photon. Les résultats complets obtenus avec le jeu de données collecté en 2012, ayant fait l'objet d'une publication officielle, sont tout d'abord présentés. Les premiers résultats obtenus avec le jeu de données collecté en 2015 sont enfin introduits
A particle compatible with the Standard Model Higgs boson has been discovered at the Large Hadron Collider (LHC) in July 2012 by Atlas and CMS experiments. All the couplings measurements are so far compatible with those predicted by the Standard Model. However, this model is not able to address several fundamental physics issues and theories beyond the Standard Model, such as supersymmetry, have been proposed to address these questions. Some of them predict an extended Higgs sector with additional scalar or pseudoscalars at low mass.On the experimental point of view, the diphoton decay channel provides a clear signature and allows us to explore the Higgs sector with high precision.The studies presented in this thesis have been performed using the data collected by CMS at the LHC.The first part of the document is dedicated to photon reconstruction studies. First, a photon energy correction method is presented. Then, photon reconstruction performance is assessed in the context of the Phase I and Phase II detector upgrades, in high luminosity conditions.The second part of the document is dedicated to the search for an additional light Higgs boson (with a mass below 110 GeV) in the diphoton channel. First, the official results corresponding to the full 2012 dataset are exposed. Finally, results corresponding to 2015 data are presented
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Amendola, Chiara. « Vector Boson Fusion trigger and study of events featuring di-tau pairs and b jets in the CMS experiment ». Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLX103.

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Cette thèse présente une recherche d'événements avec paires de bosons de Higgs (HH) en collisions proton-proton à 13 TeV, fournies par le Large Hadron Collider, au sein de l'expérience CMS (Compact Muon Solenoid) du CERN (Genève). L'étude de la production de paires de bosons de Higgs permet la mesure de la constante d’auto-couplage trilinéaire. En plus, la production HH par fusion de bosons vecteurs (Vector Boson Fusion ou VBF) donne accès à la mesure de la constante de couplage entre deux bosons de Higgs et deux bosons vecteurs. La valeur de ces deux paramètres est particulièrement sensible à l'existence de physique au-delà du Modèle Standard : même des faibles variations par rapport aux valeurs des couplages prévus par la théorie peuvent induire un changement important de la section efficace. Cette thèse cible le cas où un des bosons de Higgs se désintègre dans deux leptons tau et l'autre dans deux jets de particules engendrés par des quarks de type beau : cet état final permet de conjuguer une statistique importante garantie par la désintégration en quarks et la pureté de la désintégration en leptons tau.Cependant, la production de HH au LHC est un processus très rare. La production par le mécanisme principal, de fusion de gluon, a une section efficace d'environ 30 fb, suivi par le processus de VBF, lequel est environ 10 fois moins probable. Ainsi, optimiser l'efficacité de la sélection du signal est essentiel. Par conséquent, la première partie du travail de thèse a été dédiée à l'étude d'algorithmes pour le premier niveau du système de déclenchement de CMS, en implémentant des sélections similaires à celles qui sont appliquées au niveau de l'analyse finale, et un algorithme dédié au processus VBF a été mis au point en ciblant des possibles améliorations pour la recherche d'événements HHbbtt. Sa topologie, caractérisée par la présence de deux jets reconstruits dans des régions opposées du détecteur, est un levier puissant pour le distinguer des autres processus. L’algorithme sélectionne les événements en exploitant les propriétés cinématiques des jets, indépendamment des caractéristiques de la désintégration du boson de Higgs : d'ailleurs, utilisé en complément des algorithmes classiques, ciblant les produits de désintégration du boson de Higgs, l’algorithme VBF permet d’étendre la couverture de l'espace des phases de manière significative. Il s’agit du premier algorithme VBF pour le système de déclanchement et il a été inclus dans la prise de données à partir de l'été 2017. D'ailleurs, les données ainsi sélectionnées sont accessibles pour les recherches du boson de Higgs en cours.La suite du travail de thèse a été consacrée à l'analyse d'événements HH->bbtautau avec les données collectées en 2017. L'extraction du signal depuis les données requiert une bonne connaissance des bruits de fond, dont les principaux sont la production de ttbar qui est irréductible dans la mesure où il produit une paire de quark b et une paire de leptons taus ; le bruit de fond d'événements multi-jet génériques, où les jets peuvent être identifiés à tort comme leptons taus ; et le bruit de fond de Z->tautau où des jets additionnels peuvent être identifiés comme des jets de b. Ce dernier bruit de fond a été étudié en détail pour en améliorer la modélisation. En plus de l'étude inclusive des événements de type HH->bbtautau, une catégorie d’événements dédiée à la production par VBF a été incluse, conçue à partir de l'espace des phases couvert par l’algorithme VBF du système de déclanchement et de la topologie typique du processus, en utilisant aussi des techniques d’apprentissage automatique. L'introduction de telle catégorie est la première mesure dédiée à ce mécanisme de production dans le cadre des analyses de HH->bbtautau. Ces améliorations et les interprétations additionnelles sont très importantes pour la collaboration CMS et ils seront inclus dans la publication relative aux données collectées pendant le Run 2
This thesis describes a search for events with a pair of Higgs bosons (HH) in proton-proton collisions at 13 TeV, provided by the Large Hadron Collider, with the CMS (Compact Muon Solenoid) experiment at CERN (Geneva).The study of the Higgs boson pair production allows its trilinear self-coupling to be measured. Moreover, the HH production through Vector Boson Fusion (VBF) gives access to the measurement of the coupling between two Higgs bosons and two vector bosons. The values of these parameters are particularly sensitive to the existence of physics beyond the Standard Model: even small variations from the values of the couplings predicted by the theory can lead to a large modification of the cross section. This thesis is focused on the scenario where one of the Higgs bosons decays in two tau leptons and the other in two jets of particles generated by b-quarks: the study of this final state benefits from the high statistics of the decay in quarks and from the purity of the decay in tau leptons.However, the HH production at the LHC is a very rare process. The production through the main mechanism, by gluon fusion, has a cross section of about 30 fb, followed by the VBF process, which is about 10 times less likely. Therefore, the optimisation of the signal selection is essential. Hence, the first part of the thesis work was devoted to the study of algorithms for the Level-1 (L1) trigger system of CMS, implementing selections similar to those applied at the final analysis stage, and a dedicated algorithm for the VBF process was optimised, targeting possible improvements for the search for HH->bbtautau events. The VBF topology, characterised by two jets reconstructed in opposite regions of the detector, is a powerful handle to discriminate it from other processes. The algorithm selects the events exploiting the kinematic features of the jets, independently of the properties of the decay of the Higgs boson: used as a complement of the classic algorithms that target the decay products of the Higgs boson, the VBF algorithm allows the coverage of the phase-space to be significantly expanded. This is the first VBF algorithm for the L1 trigger system and it was included for the data-taking starting from summer 2017. Hence, the events thus selected are available for the ongoing Higgs boson searches.The rest of the thesis work was dedicated to the analysis of events HHbbtt with the data collected in 2017. The signal extraction from data requires a good knowledge of the background processes. Among them, the most important are the ttbar production, which is irreducible if its final state has a pair of tau leptons in addition to the two b quarks; the generic QCD multi-jet background, since the jets can be misidentified as tau leptons; and the Z->tautau background, where additional jets can be identified as b-jets. The latter was studied in detail to improve its modelling. In addition to the inclusive study of the HH->bbtautau events, an event category for the VBF production was included, designed starting from the phase-space covered by the L1 trigger VBF algorithm and from the typical topology of the process, also using machine learning techniques. The introduction of the VBF category gives the first dedicated measurement for this production mechanism in the context of the HH->bbtautau analyses. These improvements and the additional interpretations are important for the CMS collaboration and they will be included in the publication corresponding to the data collected during the Run 2
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Paoletti, Giordano. « Search for neutral MSSM Higgs bosons with CMS at LHC : a comparison between a cut-based analysis and a Machine Learning approach ». Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/19141/.

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Con l’avvento della fase ad Alta Luminosità di LHC (HL-LHC), la luminosità istantanea del Large Hadron Collider del CERN aumenterà di un fattore 10, oltre il valore di progettazione. La Fisica delle Alte Energie si dovrà quindi confrontare con un notevole aumento della quantità di eventi raccolti, consentendo l'indagine di scale energetiche ancora inesplorate. In questo contesto si colloca la ricerca di bosoni di Higgs neutri aggiuntivi, previsti dalle estensioni del Modello Standard, quali ad esempio quella del Modello Supersimmetrico Minimale, teoria che suppone l’esistenza di altri bosoni di Higgs, più massivi di quello rilevato nel 2012. Alcune precedenti ricerche sono state condotte dai diversi esperimenti di LHC; in particolare per questa tesi è stata presa come riferimento l’analisi pubblicata nel 2019 dalla Collaborazione CMS, ricercando i bosoni di Higgs in uno stato di decadimento finale mu^{+} mu^{-} in un range di massa tra i 130 e i 1000 GeV, prodotti dalla collisione di protoni ad una energia del centro di massa di 13 TeV. Con il nuovo upgrade di LHC sarà possibile estendere il range di massa in cui ricercare i bosoni fino ad oltre 1 TeV può quindi dimostrarsi conveniente l’utilizzo di nuove tecniche e strumenti di analisi che utilizzano algoritmi di Machine Learning. In questo modo sarebbe infatti possibile incrementare il livello di complessità dell’analisi, includendo eventualmente tra le variabili di ingresso anche l’ipotesi di massa iniziale del bosone di Higgs supersimmetrico ed ottenendo un modello sempre più generalizzato. In questa tesi vengono confrontati i risultati della classificazione tra eventi di segnale ed eventi di fondo di un’analisi "tradizionale" cut-based, sulla base di quella di riferimento, e un' analisi multivariata condotta utilizzando una BDT implementata in ROOT. I risultati confermano un possibile miglioramento nella classificazione tra segnale e fondo, utilizzando un’analisi multivariata.
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ZUOLO, DAVIDE. « Development of silicon pixel sensors for the High Luminosity upgrade of the CMS experiment at LHC and search for Higgs boson pair production in the $bar b au^+ au^- :$ final state at $sqrt{s}$ = 13 TeV ». Doctoral thesis, Università degli Studi di Milano-Bicocca, 2021. http://hdl.handle.net/10281/308715.

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Durante il mio percorso di dottorato mi sono occupato principalmente dello sviluppo di nuovi sensori a pixel in Silicio per l’upgrade dell’esperimento CMS in vista della fase ad alta luminosità del collisionatore LHC (HL – LHC o LHC fase 2) al CERN, un’attività che avevo già intrapreso per il mio lavoro di tesi magistrale. Questi sensori devono tollerare fluenze di radiazione di alcuni 10^16 neq/cm^2 ad una distanza di circa 3 cm dal punto di interazione. Il programma di R&D portato avanti da un gruppo INFN ATLAS-CMS, in collaborazione con Fondazione Bruno Kessler, riguarda lo sviluppo di sensori planari sottili e 3D su substrati prodotti con la tecnica del Direct Wafer Bonding. L'impiego di questa tecnica permette di attuare tutti i processi di fabbricazione su una sola superficie del wafer, riducendo notevolmente i costi del processo. Lo spessore attivo dei prototipi è di 100 o 130 um per i sensori planari e 130 um per quelli 3D. I primi sensori prodotti hanno pixel delle stesse dimensioni di quelli attualmente in uso in CMS, 100 x 150 um^2. Le dimensioni sono state poi ridotte a 25 x 100 um^2 e 50 x 50 um^2 in modo da aumentare il numero di canali di lettura in vista della maggiore molteplicità di tracce attesa ad HL-LHC. Sono state effettuate numerose campagne di prova su fascio per caratterizzare i sensori planari e quelli 3D, prima e dopo l’irraggiamento a fluenze fino a 1 x 10^16 neq/cm^2. I miei contributi alla caratterizzazione dei prototipi sono riportati in questa tesi e includono anche lo sviluppo di algoritmi dedicati. Dopo circa due anni di lavoro sulla caratterizzazione dei nuovi prototipi ho sviluppato un interesse anche per l’impatto del rivelatore a pixel sul programma di fisica dell’esperimento. All’inizio del mio secondo anno di dottorato mi sono messo in cerca di un’analisi in cui le informazioni del rivelatore a pixel fossero largamente sfruttate. Ho scelto di lavorare alla ricerca della produzione di coppie di bosoni di Higgs nello stato finale con 2 b-jets e 2 leptoni tau. Ho scelto questa analisi sia perchè la ricostruzione delle particelle nello stato finale fa ampio uso delle informazioni di tracce e vertici sia perchè l’analisi trarrà grande benificio dell'incremento della statistica previsto ad HL-LHC, che potrebbe portare ad avere la prima evidenza sperimentale di produzione HH. La ricerca di coppie di bosoni di Higgs ha un ruolo fondamentale nella caratterizzazione di questa particella in quanto rappresenta il canale migliore per la misura della costante di accoppiamento trilineare. Ogni deviazione dalle previsioni teoriche del Modello Standard porterebbe a cambiamenti importanti nella cinematica e nel rateo di produzione di coppie di bosoni di Higgs, il che rende queste ricerche sensibili a effetti di nuova fisica. Lo stato finale bbtau^+tau^- rappresenta uno dei canali più interessanti in questo studio visti il branching ratio elevato e la piccola contaminazione di eventi di fondo. In questa tesi viene descritta la strategia sviluppata per l'analisi dei dati raccolti dall’esperimento CMS durante il Run 2 di LHC (2016 + 2017 + 2018), corrispondenti ad una luminosità integrata di 137 fb^-1. Viene inoltre riportata la sensitività attesa dell'analisi, che include lo studio di due meccanismi di produzione di coppie di bosoni di Higgs: Gluon-Gluon Fusion (GGF) e Vector Boson Fusion (VBF).
My research activity during the PhD has focused mainly on the development of new silicon pixel sensors for the upgrade of the CMS experiment inner tracker in view of the CERN LHC High Luminosity phase (HL-LHC), an activity I started to work on during my master thesis. These sensors must be capable of surviving irradiation fluences up to a few 10^16 neq/cm^2 at ~ 3 cm from the interaction point. The R&D program carried out by an INFN ATLAS-CMS group, in collaboration with Fondazione Bruno Kessler, covers both planar and 3D pixel devices made on substrates obtained by the Direct Wafer Bonding technique. Using this technology, every fabrication process takes place on one side only of the wafer, with consequent cost savings. The active thickness of the planar sensors studied in this thesis is 100 um or 130 um, that of 3D sensors 130 um. Sensors belonging to the first batches have pixel cells with dimensions of 100 x 150 um^2, same as the sensors currently installed in CMS. These dimensions have been reduced to 25 x 100 um^2 and 50 x 50 um^2 in order to cope with the higher track multiplicity expected at HL-LHC. Prototypes of hybrid modules, bump-bonded to different readout chips, have been characterized in beam tests. Results on their performance before and after irradiation up to maximum fluence of ∼ 1 x 10^16 neq/cm^2 are reported in this thesis. After a couple of years working on the characterization of the new prototypes I became interested also on the impact of the pixel detector on the physics program of the experiment. At the beginning of my second year of PhD I started to look for a physics analysis where the information of the pixel detector is largely exploited. I chose to work on the search for double Higgs boson production in final states with 2 b-jets and 2 tau leptons since the reconstruction of the b-jets and tau leptons makes large use of vertexes and tracks information. Another reason why I chose this analysis is that it will benefit from the incremented statistics foreseen at HL-LHC, possibly leading to the first experimental evidence of HH production. Double Higgs searches play a fundamental role in the characterization of the Higgs boson as they represent the favorite channel to measure the Higgs boson trilinear self coupling. Any deviation from the theoretical predictions of the Standard Model would lead to sizable changes in both the kinematics and production rate of HH events, thus making double Higgs searches sensitive to new physics effects. The bbtau^+tau^-final state represents one of the most interesting channels to explore double Higgs production, because of the high branching ratio and the relatively small background contamination. The strategy developed to analyze data collected by the CMS experiment during the LHC Run 2 (2016 + 2017 + 2018), corresponding to an integrated luminosity of 137 fb^-1, is described in this thesis. The expected sensitivity of the analysis, targeting both the Gluon Fusion (GGF) and Vector Boson Fusion (VBF) production channels, is also reported.
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Aurousseau, Mathieu. « Mesure in situ de l'uniformité du calorimètre électromagnétique et recherche des premiers événements di-photons dans ATLAS ». Phd thesis, Chambéry, 2010. http://tel.archives-ouvertes.fr/tel-00546713.

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La recherche d'un boson de Higgs léger dans le canal H --> gamma gamma dans l'expérience ATLAS nécessite d'excellentes performances du calorimètre électromagnétique et une bonne compréhension des bruits de fond. Ce travail de thèse s'articule donc autour de deux points. Le premier concerne le fonctionnement et les performances du calorimètre électromagnétique. D'abord, des développements sont apportés au code de reconstruction online des calorimètres à Argon liquide, et ses algorithmes sont validés, ce qui inclut un contrôle des données en ligne. Ensuite, deux mesures indépendantes de l'uniformité du calorimètre électromagnétique tonneau sont réalisées, l'une avec les muons cosmiques et portant sur une couverture effective d'environ 20% du calorimètre, et l'autre avec les événements pi0 --> gamma gamma dans les premières collisions à sqrt(s) = 7 TeV, avec une luminosité intégrée de L = 414.8 μb−1. La mesure sur les muons montre que les non-uniformités dans la direction eta sont inférieures à 1.0% dans le compartiment milieu et 1.7% dans le compartiment avant, à 95% de niveau de confiance. Avec les pi0, ces résultats sont améliorés et aboutissent à une dispersion de la réponse entre données et simulation inférieure à 0.7% dans les trois cryostats (tonneaux et bouchons), ce qui est au niveau des performances attendues au démarrage. Le deuxième axe de cette thèse concerne l'extraction de paires non-résonnantes de photons. Deux méthodes sont présentées. La première est une double mesure de pureté utilisant une extrapolation du bruit de fond à partir de régions enrichies en bruit de fond vers une région de signal. La seconde méthode est basée sur une matrice d'efficacités de taille 4x4, entièrement déterminée par la simulation et appliquée événement par événement. Ces méthodes sont appliquées aux données de collision, correspondant à une luminosité intégrée de L = 2.82 pb−1. Un signal di-photons direct de 108.6 ± 19.5 (stat.) ± 34.5 (syst.) avec une pureté de (65.1 ± 8.6 (stat.) ± 8.7 (syst.))% est extrait.
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Fontanesi, Elisa. « Studio di produzione associata dei bosoni Higgs e Z in interazioni protone-protone a LHC ». Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amslaurea.unibo.it/7833/.

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Uno dei cardini nel programma di ricerca attuale del Large Hadron Collider (LHC) al CERN è l’approfondimento della conoscenza relativa al bosone di Higgs e agli accoppiamenti di questa particella, di recente scoperta, con le altre del Modello Standard. Il prossimo Run di LHC sarà caratterizzato da collisioni di fasci di protoni con un'energia di 6.5 TeV ciascuno e renderà possibile l’acquisizione di grandi campioni di dati nei quali si prevede un aumento della statistica per tipologie di eventi che fino a questo momento è stato problematico studiare. Tra questi la produzione per Higgs-strahlung del bosone di Higgs associato al bosone vettore Z, che, essendo caratterizzata da una bassa sezione d’urto, è sempre stata considerata un processo molto difficile da investigare. Questa tesi fornisce uno studio preliminare della fattibilità di recuperare in modo efficiente questo canale, con l’obiettivo di individuare alcuni tagli che permettano di ripulire il grande fondo adronico prodotto nelle collisioni protone-protone a LHC. La presente analisi è stata effettuata su campioni di dati ottenuti tramite una generazione Monte Carlo e una simulazione parametrica del rivelatore ATLAS. Sebbene la statistica dei campioni MC sia ancora limitata e la simulazione della risposta del detector non sia dettagliata, le tecniche e i tagli utilizzati in questo lavoro di tesi potranno dare utili indicazioni per futuri studi più dettagliati e per l'investigazione di questo processo una volta che i dati del prossimo Run di LHC a √s=13 TeV saranno disponibili.
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Zallio, Luigi. « Studio dell’incertezza relativa alla modellizzazione del fondo Z+jets dell’analisi ZH(−→b ̄b) effettuata con i dati raccolti da ATLAS A√s= 13 TeV ». Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/19174/.

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In questa tesi viene presentato il contributo personale all’interno della misura dell'accoppiamento del bosone di Higgs con i quark b condotta da ATLAS sui dati raccolti nel 2015-2018 (Run2), ad una luminosità di 140 fb-1. Tale contributo si sviluppa all’interno dell’analisi ZH-> ll ̅bb ̅, dove mi sono occupato delle incertezze sistematiche relative alla modellizzazione dei processi di fondo Z+jets. Ho confrontato le distribuzioni nominali prodotte dal generatore SHERPA2.2.1 per alcune variabili cinematiche con le distribuzioni ottenute variando le PDF prima, e con quelle ottenute variando i coefficienti di fattorizzazione \mu_F e di rinormalizzazione \mu_R poi. Ho infine stimato l’incertezza sistematica dovuta a queste variazioni in due regioni di impulso trasverso del bosone vettore Z e per diverse molteplicità di b-jets. Si è ottenuto che le distribuzioni ottenute variando le PDF si discostano da quella nominale per valori oscillanti tra l’1% ed il 3% sia per molteplicità di 2 che >= 3 jets. Le distribuzioni ottenute variando i fattori di scala presentano variazioni del 15% per molteplicità di 2 jets e maggiori del 50% per un numero >= 3 di jets.
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Leney, Katharine J. C. « Searches for Higgs bosons in the di-tau decay channels at the ATLAS experiment ». Thesis, University of Liverpool, 2010. http://livrepository.liverpool.ac.uk/1459/.

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The search for the Higgs boson will be one of the primary tasks of the LHC. One of the most promising channels in the search for a low mass Higgs boson will be the scenario where the Higgs is produced via Vector Boson Fusion and subsequently decays to a pair of tau leptons. One of the dominant (and most complex) backgrounds to this analysis is expected to come from tt decays. Monte Carlo samples with a centre-of-mass energy of 14 TeV are used to investigate the contributions from different tt decay modes and to develop methods to reduce the contribution from this background process and improve the overall sensitivity of the analysis. A technique to estimate contributions from background processes when there are insufficient Monte Carlo samples available to calculate this directly is also presented. A low mass Standard Model Higgs boson will require at least 10 inverse femtobarns of data before a discovery (or exclusion) can be claimed, but extensions to the Standard Model that realise Supersymmetry predict that there should be three neutral Higgs bosons. The production cross-section is strongly enhanced and it is there- fore expected that competitive limits on an MSSM Higgs boson can be made using data from the 2010-2011 LHC data-taking period (1 inverse femtobarn expected with 7 TeV centre-of-mass collisions). A search strategy for an MSSM Higgs boson decaying to two taus is presented, focusing on ensuring analysis robustness during this early period. Comparisons with the first ATLAS data are also made.
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Vaheid, Halimeh. « Generation and Validation of di-Higgs events in the 4τ final state ». Thesis, Uppsala universitet, Högenergifysik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-355744.

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The Higgs self-coupling has a vital role by giving a deeper understanding of the Higgs particle. Furthermore, the way it opens to physics beyond the SM, encourages us to do MC simulationstudies for varying λ_hhh . In this project, we investigate the effects of choosing different values for λ_hhh on the kinematics of all particles involved in the hh → τ τ τ τ decay channel and the resultsare compared with what we get from the SM prediction of λ_hhh .The data show that λ_hhh more close to the SM trilinear Higgs self-coupling results in generatingthe Higgs particles with the higher masses and higher momenta. On the other hand, for the moremassive Higgs bosons we have more energetic neutrinos in the final states which escape from thedetector without being detected.
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Livres sur le sujet "Bosone di Higg"

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Casalbuoni, R. La ricerca del bosone di Higgs. Firenze, Italy : Firenze University Press, 2013.

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Magliocco, Paolo. La grande caccia : Storia della scoperta del bosone di Higgs. Milano : Pearson, 2013.

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Lamberti, Corrado. Il bosone di Higgs : Il trionfo del modello standard o l'alba di una nuova fisica ? Reggio Emilia : Aliberti editore, 2012.

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Storia della rottura di simmetria : Dalla colonna di Eulero al Bosone di Higgs, il lungo cammino di un'idea. Roma : Aracne editrice S.r.l., 2012.

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Maiani, L. A caccia del bosone di Higgs : Magneti, governi, scienziati e particelle nell'impresa scientifica del secolo. [Milan] : Mondadori università, 2013.

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Accenti, Eva, et Ettore Accenti. Meccanica Quantistica 1 : Dal Quanto Di Planck Al Bosone Di Higgs. Independently Published, 2019.

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Terzo millennio. Dal bosone di Higgs al villaggio virtuale. L'Aquila, Italy : Scuola Superiore Guglielmo Reiss Romoli, 1997.

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La particella alla fine dell'universo : La caccia al bosone di Higgs e le nuove frontiere della fisica. Codice Edizioni, 2013.

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Manzoni, Stefano. Physics with Photons Using the ATLAS Run 2 Data : Calibration and Identification, Measurement of the Higgs Boson Mass and Search for Supersymmetry in Di-Photon Final State. Springer, 2019.

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Manzoni, Stefano. Physics with Photons Using the ATLAS Run 2 Data : Calibration and Identification, Measurement of the Higgs Boson Mass and Search for Supersymmetry in Di-Photon Final State. Springer International Publishing AG, 2020.

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Chapitres de livres sur le sujet "Bosone di Higg"

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Verzegnassi, Claudio. « La luce della Conoscenza : da Prometeo al bosone di Higgs ». Dans Il senso ritrovato, 11–22. Milano : Springer Milan, 2013. http://dx.doi.org/10.1007/978-88-470-2832-6_2.

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Curceanu, Catalina Oana. « Il bosone di Higgs : il tassello mancante del Modello Standard ». Dans Dai buchi neri all’adroterapia, 233–38. Milano : Springer Milan, 2013. http://dx.doi.org/10.1007/978-88-470-5241-3_30.

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Shah, Aashaq, Ashok Kumar et Mario Pelliccioni. « Search for Heavy Neutral Higgs in Di-Boson Final State at $$\sqrt{s}$$ = 13 TeV ». Dans XXII DAE High Energy Physics Symposium, 905–7. Cham : Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-73171-1_221.

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Mondal, Kuntal. « Measurements of Higgs Boson Production and Properties in Di-photon Decay Channel Using Data Collected by CMS Detector at Center of Mass Energy of 13 TeV ». Dans XXII DAE High Energy Physics Symposium, 201–4. Cham : Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-73171-1_45.

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Taber, Douglass F. « Enantioselective Synthesis of Alkylated Centers : The Fukuyama Synthesis of (–)-Histrionicotoxin ». Dans Organic Synthesis. Oxford University Press, 2015. http://dx.doi.org/10.1093/oso/9780190200794.003.0039.

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Vinod K. Singh of the Indian Institute of Technology, Kanpur optimized (Org. Lett. 2011, 13, 6520) an organocatalyst for the enantioselective addition of thiophenol to an imide 1 to give 2 in high ee. Amir H. Hoveyda of Boston College developed (Angew. Chem. Int. Ed. 2011, 50, 7079) a Cu catalyst for the preparation of 4 by the enantioselective hydroboration of a 1,1-disubstituted alkene 3. Yong-Qiang Tu of Lanzhou University effected (Chem. Sci. 2011, 2, 1839) enantioselective bromination of the prochiral 5 to give the bromoketone 6. Song Ye of the Institute of Chemistry, Beijing established (Chem. Commun. 2011, 47, 8388) the alkylated quaternary center of the dimer 8, by condensing a ketene 7 with CS2. Li Deng of Brandeis University added (Angew. Chem. Int. Ed. 2011, 50, 10565) cyanide in a conjugate sense to an acyl imidazole 9 to give 11. Pier Giorgio Cozzi of the Università di Bologna prepared (Angew. Chem. Int. Ed. 2011, 50, 7842) the thioacetal 14 by condensing 13 with an aldehyde 12, followed by reduction. Takahiro Nishimura and Tamio Hayashi of Kyoto University devised (Chem. Commun. 2011, 47, 10142) a Co catalyst for the enantioselective addition of a silyl alkyne 16 to an enone 15 to give the alkynyl ketone 17. Ping Tian and Guo-Qiang Lin of the Shanghai Institute of Organic Chemistry described (Tetrahedron 2011, 67, 10186) improved catalysts for the enantioselective conjugate addition of dimethyl malonate 19 to the nitroalkene 18, to give 20. Keiji Maruoka, also of Kyoto University, established (Chem. Sci. 2011, 2, 2311) conditions for the enantioselective addition of an aldehyde 21 to the acceptor 22 to give, after reduction, an alcohol 23 that could readily be cyclized to the lactone. Jianrong (Steve) Zhou of Nanyang Technological University prepared (J. Am. Chem. Soc. 2011, 133, 15882) the ester 26 by arylation, under Pd catalysis, of a ketene silyl acetal 24 with the triflate 25. Benjamin List of the Max-Planck-Institut, Mülheim employed (Angew. Chem. Int. Ed. 2011, 50, 9471) a system of three catalysts to effect the enantioselective alkylation of an aldehyde 27 with the allyic alcohol 28 to give 29.
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Actes de conférences sur le sujet "Bosone di Higg"

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Roy, Dennis. « Searches for resonant di-boson production at CMS ». Dans European Physical Society Conference on High Energy Physics. Trieste, Italy : Sissa Medialab, 2020. http://dx.doi.org/10.22323/1.364.0568.

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Phillips, Thomas. « Di-boson production and limits on triple gauge boson couplings at the Tevatron ». Dans 35th International Conference of High Energy Physics. Trieste, Italy : Sissa Medialab, 2011. http://dx.doi.org/10.22323/1.120.0072.

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Chevalier, Laurent. « Di-boson production measurements with the ATLAS detector ». Dans The European Physical Society Conference on High Energy Physics. Trieste, Italy : Sissa Medialab, 2016. http://dx.doi.org/10.22323/1.234.0330.

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Ita, Harald, Fernando Febres Cordero et Philipp Hofmann. « Di-vector Boson Production in Association with Multiple Jets at the LHC ». Dans The European Physical Society Conference on High Energy Physics. Trieste, Italy : Sissa Medialab, 2016. http://dx.doi.org/10.22323/1.234.0493.

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Boukidi, Mohammed, Rachid Benbrik, Stefano Moretti et Souad Semlali. « Probing a 96 GeV Higgs Boson in the Di-Photon Channel at the LHC ». Dans 41st International Conference on High Energy physics. Trieste, Italy : Sissa Medialab, 2022. http://dx.doi.org/10.22323/1.414.0547.

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Totaro, Pierluigi. « Search for Standard Model Higgs boson in di-tau final state at the Tevatron ». Dans 35th International Conference of High Energy Physics. Trieste, Italy : Sissa Medialab, 2011. http://dx.doi.org/10.22323/1.120.0080.

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D'Amante, Valeria. « Search for resonant and nonresonant di-Higgs boson production at CMS using jet substructure techniques ». Dans 41st International Conference on High Energy physics. Trieste, Italy : Sissa Medialab, 2022. http://dx.doi.org/10.22323/1.414.0504.

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Saxena, Pooja. « Measurements of Higgs boson production and properties in the di-lepton decay channel using the CMS detector ». Dans 38th International Conference on High Energy Physics. Trieste, Italy : Sissa Medialab, 2017. http://dx.doi.org/10.22323/1.282.0391.

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Tavolaro, Vittorio. « Measurements of Higgs boson production and properties in the di-photon decay channel using the CMS detector ». Dans 38th International Conference on High Energy Physics. Trieste, Italy : Sissa Medialab, 2017. http://dx.doi.org/10.22323/1.282.0385.

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Spanring, Markus. « Search for additional neutral MSSM Higgs bosons in the di-tau final state at CMS ». Dans An Alpine LHC Physics Summit. Trieste, Italy : Sissa Medialab, 2018. http://dx.doi.org/10.22323/1.330.0054.

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Rapports d'organisations sur le sujet "Bosone di Higg"

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Dixon, Lance. The Di-Photon Background to a Light Higgs Boson at the LHC. Office of Scientific and Technical Information (OSTI), novembre 2002. http://dx.doi.org/10.2172/808705.

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Dixon, Lance. Isolating a Light Higgs Boson From the Di-Photon Background at the LHC. Office of Scientific and Technical Information (OSTI), juin 2002. http://dx.doi.org/10.2172/799077.

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Prasad, Vindhyawasini. Search for Di-Muon Decays of a Light Scalar Higgs Boson in Radiative Upsilon(1S) Decays. Office of Scientific and Technical Information (OSTI), août 2013. http://dx.doi.org/10.2172/1082787.

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Connolly, Amy Lynn. A Search for Supersymmetric Higgs Bosons in the Di-tau Decay Mode in Proton - Anti-proton Collisions at 1.8 TeV. Office of Scientific and Technical Information (OSTI), janvier 2003. http://dx.doi.org/10.2172/15017134.

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