| Grant number: | 09/10968-7 |
| Support type: | Scholarships in Brazil - Master |
| Effective date (Start): | March 01, 2010 |
| Effective date (End): | February 28, 2011 |
| Field of knowledge: | Physical Sciences and Mathematics - Physics |
| Principal Investigator: | Adriano Antonio Natale |
| Grantee: | Fatima Araujo Machado |
| Home Institution: | Instituto de Física Teórica (IFT). Universidade Estadual Paulista (UNESP). Campus de São Paulo. São Paulo , SP, Brazil |
Abstract Gauge theories such as Quantum Chromodynamics (QCD) exhibit the phenomenon of dynamical mass generation. Although much discussed in the literature for quark mass generation, this phenomenon is much less known regarding the gluons, but recent results on lattice QCD show that it might be held in Nature. The fact that the gluon has a dynamical mass introduces in the theory a natural infrared cutoff, which is being used by our working group in perturbative calculations up to tree level with very satisfactory results. This project aims to implement this type of procedure to the level of "loops", i.e. it is intended to work within an improved perturbation theory, introducing propagators and dressed vertex and using the "pinch" technique on an evolution of the dynamical perturbation theory proposed by Pagels and Stoker in the 1970s. A first application of this procedure will be made to the Bjorken sum rule. | |