Biblioteca Allievi della Scuola Superiore di Catania

Contents:

Dissertation note: Tesi di diploma di 1° livello per la Classe delle Scienze Sperimentali Diploma di 1° livello Scuola Superiore di Catania, Catania, Italy 2010 A.A. 2009/2010 Abstract: The physics of elementary particles is escribed by the Standard Model theory of weak and strong interactions. Many predictions of the Standard Model theory have been experimentally confirmed with good precision in the last years. However, the Higgs boson, which is the crucial ingredient in the construction of the Standard Model Lagrangian, has never been observed in experiments. The present generation of high-energy particle accelerators may (hopefully) give an answer about the existence and, in the case, the properties of the Higgs boson. High-energy scattering experiments with a center-of-mass energy of a few TeV are currently being performed at the Large Hadron Collider (LHC). Given the high precision level of detectors, indicating small statistical errors in the measurements, it becomes essential to improve the theoretical knowledge of scattering amplitudes by calculating higher-order radiative corrections. Unfortunately, radiative corrections to high-energy scattering processes have powers of a large logarithm for each order in perturbation theory. These logarithms, referred to as Sudakov logarithms, lead to a breakdown of fixed order perturbation theory. Sudakov electroweak logarithms arise because different energy scales are involved in a given process. The idea is therefore to separate the different energy scales using an effective field theory. This thesis first reviews the Standard Model theory and the main results related to Renormalization Group theory and effective field theories, with some interesting examples. Then we will use Soft-Collinear Effective Theory (SCET) to estimate the electroweak radiative corrections in Vector Boson Fusion (VBF), a relevant Higgs production process at the LHC. The formalism developed here will permit to evaluate the radiative corrections in a generic unpolarized VBF process. Some numerical estimations will be given at the end of the calculation.
Introduction -- Review -- Effective field theories -- Soft-collinear effective theory (SCET) -- Radiative corrections to Higgs production -- Conclusions -- Acknowledgements -- References.

Location | Call number | Copy number | Status | Date due |
---|---|---|---|---|

Sala B : Armadio Tesi | THS_2010 530.143 B9181 (Browse shelf) | 1 | Available | |

Sala B : Armadio Tesi | THS_2010 530.143 B9181 (Browse shelf) | 2 | Available |

Tesi di diploma di 1° livello per la Classe delle Scienze Sperimentali Diploma di 1° livello Scuola Superiore di Catania, Catania, Italy 2010 A.A. 2009/2010

Includes bibliographical references (p. 74-75).

Introduction -- Review -- Effective field theories -- Soft-collinear effective theory (SCET) -- Radiative corrections to Higgs production -- Conclusions -- Acknowledgements -- References.

Tesi discussa il 29/11/2010.

The physics of elementary particles is escribed by the Standard Model theory of weak and strong interactions. Many predictions of the Standard Model theory have been experimentally confirmed with good precision in the last years. However, the Higgs boson, which is the crucial ingredient in the construction of the Standard Model Lagrangian, has never been observed in experiments. The present generation of high-energy particle accelerators may (hopefully) give an answer about the existence and, in the case, the properties of the Higgs boson. High-energy scattering experiments with a center-of-mass energy of a few TeV are currently being performed at the Large Hadron Collider (LHC). Given the high precision level of detectors, indicating small statistical errors in the measurements, it becomes essential to improve the theoretical knowledge of scattering amplitudes by calculating higher-order radiative corrections. Unfortunately, radiative corrections to high-energy scattering processes have powers of a large logarithm for each order in perturbation theory. These logarithms, referred to as Sudakov logarithms, lead to a breakdown of fixed order perturbation theory. Sudakov electroweak logarithms arise because different energy scales are involved in a given process. The idea is therefore to separate the different energy scales using an effective field theory. This thesis first reviews the Standard Model theory and the main results related to Renormalization Group theory and effective field theories, with some interesting examples. Then we will use Soft-Collinear Effective Theory (SCET) to estimate the electroweak radiative corrections in Vector Boson Fusion (VBF), a relevant Higgs production process at the LHC. The formalism developed here will permit to evaluate the radiative corrections in a generic unpolarized VBF process. Some numerical estimations will be given at the end of the calculation.