Determination of the real part of the isospin-even forward scattering amplitude of low energy pion-nucleon scattering as a test of low energy quantumchromodynamics
Conference
·
· AIP Conf. Proc.; (United States)
OSTI ID:5960364
The real part of the isospin-even forward scattering amplitude Re D/sup +/ (t = 0) of the pion-nucleon scattering has been determined at an incident pion kinetic energy of 55 MeV by measuring the elastic scattering of positive and negative pions on protons within the Coulomb-nuclear interference region (t being the four momentum transfer). The value of Re D/sup +/ (t = 0) confirms the prediction of the Karlsruhe-Helsinki phase shift analysis/sup 1/ for that energy. These phases can be used to determine the sigma-term of pion-nucleon scattering by means of forward dispersion relations. Koch/sup 2/ obtained in such an analysis sigma = (64 +- 8) MeV at the Cheng-Dashen point t = 2 m/sup 2//sub ..pi../, ..nu.. = 0, which differs significantly from the value determined by chiral perturbation theory of QCD/sup 3/ sigma = (35 +- 5) MeV at t = ..nu.. = 0.
- Research Organization:
- Kernforschungszentrum Karlsruhe, Institut fuer Kernphysik und Universitaet Karlsruhe, Institut fuer Experimentelle Kernphysik, Postfach 3640, D 7500 Karlsruhe 1
- OSTI ID:
- 5960364
- Report Number(s):
- CONF-860575-
- Conference Information:
- Journal Name: AIP Conf. Proc.; (United States) Journal Volume: 150:1
- Country of Publication:
- United States
- Language:
- English
Similar Records
Hidden strangeness in the proton Determination of the real part of the isospin-even forward-scattering amplitude of pion-nucleon scattering at 54. 3 MeV
Low-energy differential cross sections of pion-proton ([pi][sup [plus minus]][ital p]) scattering. I. The isospin-even forward scattering amplitude at [ital T][sub [pi]]=32. 2 and 44. 6 MeV
Pion--nucleon sigma-commutator. [S waves, phase shift, amplitudes]
Journal Article
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Thu Nov 30 23:00:00 EST 1989
· Physical Review (Section) D: Particles and Fields; (USA)
·
OSTI ID:7273735
Low-energy differential cross sections of pion-proton ([pi][sup [plus minus]][ital p]) scattering. I. The isospin-even forward scattering amplitude at [ital T][sub [pi]]=32. 2 and 44. 6 MeV
Journal Article
·
Fri Mar 31 23:00:00 EST 1995
· Physical Review, C (Nuclear Physics); (United States)
·
OSTI ID:6546930
Pion--nucleon sigma-commutator. [S waves, phase shift, amplitudes]
Technical Report
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Fri Jul 01 00:00:00 EDT 1977
·
OSTI ID:7211677
Related Subjects
645103 -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Strong Interactions & Baryon & Meson Properties
651220* -- Nuclear Properties & Reactions
A=1-5
Experimental
653003 -- Nuclear Theory-- Nuclear Reactions & Scattering
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
AMPLITUDES
ASYMMETRY
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
ELASTIC SCATTERING
ENERGY RANGE
FIELD THEORIES
HADRON REACTIONS
HYDROGEN 1 TARGET
MESON REACTIONS
MEV RANGE
MEV RANGE 10-100
NUCLEAR REACTIONS
PION MINUS REACTIONS
PION PLUS REACTIONS
PION REACTIONS
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
SCATTERING
SCATTERING AMPLITUDES
TARGETS
651220* -- Nuclear Properties & Reactions
A=1-5
Experimental
653003 -- Nuclear Theory-- Nuclear Reactions & Scattering
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
AMPLITUDES
ASYMMETRY
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
ELASTIC SCATTERING
ENERGY RANGE
FIELD THEORIES
HADRON REACTIONS
HYDROGEN 1 TARGET
MESON REACTIONS
MEV RANGE
MEV RANGE 10-100
NUCLEAR REACTIONS
PION MINUS REACTIONS
PION PLUS REACTIONS
PION REACTIONS
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
SCATTERING
SCATTERING AMPLITUDES
TARGETS