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Branca, Antonio (2013) Search for the Supersymmetric Higgs boson in the pp -> b + Phi; Phi -> bb-bar channel with the CMS detector at LHC. [Tesi di dottorato]

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Abstract (inglese)

In this thesis the analysis performed for the search of the Higgs boson predicted by the Minimal Super-symmetric Standard Model (MSSM) is presented. The process on which the search is grounded is the Higgs boson production in association with b-quarks with the subsequent decay in a b-quark pair. The analyzed data sample has been recorded by the Compact Muon Solenoid (CMS) experiment at the CERN Large Hadron Collider (LHC) in Geneva, Switzerland, during the 2011 data-taking. The data sample consists of a total integrated luminosity of L = 4.8 fb-1, recorded with different trigger paths along the 2011 LHC operations.
The trigger have been updated during the data-taking in order to cope with the increasing pp collisions instantaneous luminosity provided by the LHC. The background to the signal events has been estimated through two data-driven
methods. The systematic uncertainties related to the background have been estimated for both the shape and normalization. The signal is modeled through Monte Carlo simulation technique for different hypothesis of the Higgs boson mass. The systematic uncertainties related to the signal model, from different sources, have been estimated. A possible signal contribution in the analyzed data sample is investigated through a t to the data using the background templates estimated from the data-driven methods and the signal model from Monte Carlo simulation. The systematic uncertainties, as well as the statistics uncertainties, for both the signal and background have been taken into account in the t. The results are compatible with the expected background within the statistics and systematic uncertainties. No signal is found in the data within the sensitivity of the analysis. The sensitivity of the analysis has been calculated in the background only hypothesis.
This is reported as upper limits on the cross section of the Higgs boson produced in association with two b-quarks times the branching ratio of the decay into a b-quark pair. This values are also interpreted as upper limits on parameters
of the MSSM model. The results of the analysis discussed in this thesis have been combined with those obtained by the DESY (Hamburg, Germany) CMS group, exploiting a different
analysis strategy for searching the Higgs boson in the same channel. The combined upper limits from the two analysis improve the sensitivity of the CMS experiment to a Higgs boson signal produced through the tested channel with
respect to the single analysis.

Abstract (italiano)

In questa tesi e discussa l'analisi sviluppata per la ricerca del bosone di Higgs con le caratteristiche previste dall'estensione minimale del modello standard alle super-simmetrie (MSSM). La ricerca del segnale e effettuata nel canale in cui il bosone di Higgs e prodotto in associazione con uno o due b-quark e successivamente decade in due b-quark. I dati utilizzati a tal proposito sono stati acquisiti durante la presa dati del 2011 all'esperimento Compact Muon Solenoid (CMS) installato al Large Hadron Collider (LHC) del CERN di Ginevra, Svizzera. La
luminosita integrata a cui corrisponde il campione di dati analizzato e pari a L = 4.8 fb-1. Diversi trigger sono stati sviluppati per selezionare gli eventi compatibili con lo stato finale atteso prodotto dal canale considerato. Essi sono stati implementati a seconda del periodo per far fronte all'aumento della luminosita istantanea con cui sono state fornite le collisioni pp da LHC nel corso del 2011. Il fondo al processo considerato e stato stimato tramite due metodi sviluppati a tal fine usando dati acquisiti dall'esperimento CMS. Le incertezze sistematiche sulla forma del fondo e sulla sua normalizzazione sono state determinate. La modelizzazione del segnale prodotto dal bosone di Higgs nel canale considerato, per diverse ipotesi di massa, e stata ottenuta tramite simulazione con metodo Monte Carlo. Anche in questo caso le incertezze sistematiche, dovute ai diversi contributi individuati, sono state determinate. La ricerca di un possibile contributo di segnale nei dati e stata effettuata eseguendo un fit ai dati del fondo stimato e del segnale simulato, tenendo conto delle rispettive incertezze statistiche
e sistematiche. I fit risultano compatibili con il fondo atteso entro le incertezze. Nessun segnale viene evidenziato nel campione di dati analizzato entro i limiti di sensibilita dell'analisi. I limiti di sensibilita dell'analisi sono stati calcolati nell'ipotesi di solo fondo nei dati. Tali limiti sono riportati in termini di valori della sezione d'urto di produzione associata dell'Higgs con una coppia di b-quark per la probabilita di
decadimento in due b-quark. Questi valori sono stati inoltre interpretati in termini dei parametri del modello MSSM. I risultati dell'analisi presentata in questo lavoro sono stati combinati con quelli ottenuti dall'analisi effettuata dal gruppo CMS di DESY (Amburgo, Germania) che, attraverso un'altra strategia, ha effettuato la ricerca del bosone di Higgs nello stesso canale. I limiti combinati delle due analisi migliorano la sensibilita dell'esperimento CMS ad un segnale prodotto da un bosone di Higgs nel canale considerato rispetto alle singole analisi.

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Tipo di EPrint:Tesi di dottorato
Relatore:Gasparini, Ugo
Correlatore:Lacaprara, Stefano
Dottorato (corsi e scuole):Ciclo 25 > Scuole 25 > FISICA
Data di deposito della tesi:30 Gennaio 2013
Anno di Pubblicazione:30 Gennaio 2013
Parole chiave (italiano / inglese):Physics, MSSM, Higgs, Supersymmetry, CMS, LHC
Settori scientifico-disciplinari MIUR:Area 02 - Scienze fisiche > FIS/04 Fisica nucleare e subnucleare
Struttura di riferimento:Dipartimenti > Dipartimento di Fisica e Astronomia "Galileo Galilei"
Codice ID:5876
Depositato il:21 Ott 2013 13:11
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