Pion-nucleon sigma term: state of the problem

Journal Article · Fri Nov 01 04:00:00 EST 1985 · Sov. J. Particles Nucl. (Engl. Transl.); (United States)

OSTI ID:6140626

Efrosinin, V P; Zaikin, D A

The problem of establishing the mechanism of breaking of SU(3)xSU(3) chiral symmetry and estimating the pion-nucleon sigma term, which is the parameter of this breaking, is the subject of this state-of-the-problem review. The main methods of determining the pion-nucleon sigma term are reviewed. The possible reasons for the large spread in the existing estimates of sigma/sub piN/ are investigated, and the main uncertainties of the various methods are established. The analysis leads to the establishment of an acceptable interval for sigma/sub piN/ from 30 to 50 MeV, this being in agreement with the (3,3*)direct-sum(3*,3) mechanism for breaking the SU(3)xSU(3) chiral symmetry in accordance with the Gell-Mann--Oakes--Renner model and QCD.

• Research Organization: Institute of Nuclear Research, USSR Academy of Sciences, Moscow
• OSTI ID: 6140626
• Journal Information: Sov. J. Particles Nucl. (Engl. Transl.); (United States), Journal Name: Sov. J. Particles Nucl. (Engl. Transl.); (United States) Vol. 16:6; ISSN SJPNA
• Country of Publication: United States
• Language: English

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CHIRAL SYMMETRY
DOCUMENT TYPES
FIELD THEORIES
HADRON-HADRON INTERACTIONS
INTERACTIONS
LIE GROUPS
MESON-BARYON INTERACTIONS
MESON-NUCLEON INTERACTIONS
PARTICLE INTERACTIONS
PION-NUCLEON INTERACTIONS
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
REVIEWS
SU GROUPS
SU-3 GROUPS
SYMMETRY
SYMMETRY BREAKING
SYMMETRY GROUPS