On the definition of the Δmass and width

Details On the definition of the Δmass and width On the definition of the Δmass and width

2007-07-13

arxiv.org/abs/0707.2030v1

Phys.Rev.D76:037501,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

3 pages, 1 figure, REVTeX 4

Scientific paper

10.1103/PhysRevD.76.037501

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.

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