On the definition of the \Delta mass and width
High Energy Physics - Phenomenology
2008-11-26 v1
Abstract
In the framework of effective field theory we show that, at two-loop order, the mass and width of the \Delta resonance defined via the (relativistic) Breit-Wigner parametrization both depend on the choice of field variables. In contrast, the complex-valued position of the pole of the propagator is independent of this choice.
Keywords
Cite
@article{arxiv.0707.2030,
title = {On the definition of the \Delta mass and width},
author = {D. Djukanovic and J. Gegelia and S. Scherer},
journal= {arXiv preprint arXiv:0707.2030},
year = {2008}
}
Comments
3 pages, 1 figure, REVTeX 4