Color dipoles and high energies interaction

Author(s)

Maria Simone Kugeratski Souza

• Document type: Doctoral Thesis
• Press: São Paulo.
• Institution: Universidade de São Paulo (USP). Instituto de Física (IF/SBI)
• Defense date: 2007-05-21

Examining board members

Fernando Silveira Navarra; Ivone Freire da Mota e Albuquerque; Alvaro Leonardi Ayala Filho; Adriano Antonio Natale; Sergio Szpigel

• Advisor: Fernando Silveira Navarra; Victor Paulo Barros Gonçalves

Abstract

At high energies a nucleus (and even a nucleon) becomes a dense gluonic system called the color glass condensate. In this work we study the interaction of this dense system with color dipoles. This interaction is represented by the dipole-target cross section, which has to be modeled. We have used, without success, some of the existing models to try to reproduce the data obtained at HERA and RHIC. It was not possible to obtain a global agreement between the models and the two sets of data. We have then proposed a different parametrization of the dipole cross section, which is now compatible with all the available data. In the case of deep inelastic scattering, we have extended the Iancu-Itakura-Munier model to nuclear targets and made predictions for observables to be measured in the future electron-ion collider eRHIC. Among other things, we have concluded that a large fraction of the events will be of the diffractive type. Finally, we have used the color dipole approach to build a simple model for the charmonium-hadron interaction at high energies. (AU)