{pi}NN vertex function in a meson-theoretical model

Journal Article · Mon Nov 01 04:00:00 EST 1999 · Physical Review, C

DOI:https://doi.org/10.1103/PhysRevC.60.055212· OSTI ID:692920

Boeckmann, R; Krehl, O; Krewald, S; Speth, J ^[1]; Hanhart, C ^[2]

---

1. Institut fuer Kernphysik, Forschungszentrum Juelich GmbH, D-52425 Juelich (Germany)
2. Department of Physics and INT, University of Washington, Seattle, Washington 98195 (United States)

The {pi}NN vertex function is calculated within a dispersion theoretical approach, including both {pi}{rho} and {pi}{sigma} intermediate states, where the {sigma} meson is an abbreviation for a correlated pion pair in a relative {ital S} wave with isospin I=0. A strong coupling between the {pi}{sigma} and {pi}{rho} states is found. This leads to a softening of the {pi}NN form factor. In a monopole parametrization, a cutoff {Lambda}{approx}800&hthinsp;MeV is obtained as compared to {Lambda}{approx}1000&hthinsp;MeV using {pi}{rho} intermediate states only. {copyright} {ital 1999} {ital The American Physical Society}

• OSTI ID: 692920
• Journal Information: Physical Review, C, Journal Name: Physical Review, C Journal Issue: 5 Vol. 60; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
FORM FACTORS
LAGRANGIAN FIELD THEORY
MESON-MESON INTERACTIONS
NUCLEON-NUCLEON INTERACTIONS
NUCLEONS
PION-NUCLEON INTERACTIONS
PIONS
STRONG INTERACTIONS
VERTEX FUNCTIONS