2007/07/13 by D. Djukanovic, Dalibor Djukanovic, J. Gegelia +1 · 1 citation
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1103/physrevd.76.037501
published as Phys.Rev.D76:037501,2007 · 3 pages, 1 figure, REVTeX 4
arxiv created 2007/07/13 · openalex publication_date 2007/08/30 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
In the framework of effective field theory we show that, at two-loop order, the mass and width of the \ensuremathΔ 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.