Electronic Resource
Springer
The European physical journal
352 (1995), S. 197-202
ISSN:
1434-601X
Keywords:
12.40.−Y
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract We study the pion, sigma and nucleon propagators of the linear σ-model in the one-loop approximation. We show that in the renormalized model the meson propagators exhibit imaginary poles. Such nonphysical poles disappear when a cutoff is introduced. The maximum of this cutoff value is shown to be of the orderλ c≈1.2 Gev. Once this value is fixed it is possible to find a set of parameters which allow for a selfconsistent interpretation of physical properties associated with the propagators. A 400 MeV wide resonance appears in the sigma propagator, the nucleon is a bound state and in its continuum two Roper resonances can be identified.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01298908
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