TY - JOUR
T1 - G parity and the breaking of exchange degeneracy
AU - Chew, G. F.
AU - Rosenzweig, C.
PY - 1977
Y1 - 1977
N2 - Exact exchange degeneracy, a property of the planar S matrix, is not a feature of the physical world. G parity, an exact symmetry of strong interactions, fails to be maintained by the discontinuities of the planar S matrix. This paper examines the connection between these two conflicting concepts and shows how calculations of exchange-degeneracy breaking may be based on G parity. The relation of G parity to the cylinder and torus components of the topological expansion is a central feature. We apply our arguments to ρ-A2 splitting and justify the use of an unsubtracted dispersion relation for αA2-αρ. Our analysis of the dispersion relation reveals a dominant role for the ππ channel.
AB - Exact exchange degeneracy, a property of the planar S matrix, is not a feature of the physical world. G parity, an exact symmetry of strong interactions, fails to be maintained by the discontinuities of the planar S matrix. This paper examines the connection between these two conflicting concepts and shows how calculations of exchange-degeneracy breaking may be based on G parity. The relation of G parity to the cylinder and torus components of the topological expansion is a central feature. We apply our arguments to ρ-A2 splitting and justify the use of an unsubtracted dispersion relation for αA2-αρ. Our analysis of the dispersion relation reveals a dominant role for the ππ channel.
UR - http://www.scopus.com/inward/record.url?scp=35949032429&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=35949032429&partnerID=8YFLogxK
U2 - 10.1103/PhysRevD.15.3433
DO - 10.1103/PhysRevD.15.3433
M3 - Article
AN - SCOPUS:35949032429
VL - 15
SP - 3433
EP - 3440
JO - Physical review D: Particles and fields
JF - Physical review D: Particles and fields
SN - 1550-7998
IS - 11
ER -