6533b82cfe1ef96bd128f353
RESEARCH PRODUCT
Definition of theΔmass and width
Jambul GegeliaJambul GegeliaStefan SchererDalibor Djukanovicsubject
Quantum chromodynamicsPhysicsNuclear and High Energy PhysicsField (physics)Quantum mechanicsEffective field theoryPropagatorOrder (ring theory)Invariant massParametrizationResonance (particle physics)description
In the framework of effective field theory we show that, at two-loop order, the mass and width of the $\ensuremath{\Delta}$ 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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2007-08-30 | Physical Review D |