Lowest-Lying Scalar Mesons and a Possible Probe of Their Quark Substructure

Details Lowest-Lying Scalar Mesons and a Possible Probe of Their Quark Substructure Lowest-Lying Scalar Mesons and a Possible Probe of Their Quark Substructure

1999-08-11

arxiv.org/abs/hep-ph/9908329v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

Talk given at 21st Annual MRST Conference: High Energy Physics at the Millenium, Ottawa, Ontario, Canada, 10-12 May 1999, 8 pa

Scientific paper

10.1063/1.1301287

In this talk, an overview of the status of the light scalar mesons in the context of the non linear chiral Lagrangian of references [1-3] is presented. The evidence for the existence of a scalar nonet below 1 GeV is reviewed, and it is shown that by introducing a scalar nonet an indirect way of probing the quark substructure of these scalars through the scalar mixing angle can be obtained. It is then reviewed that consistency of this non-linear chiral Lagrangian framework with the experimental data on pi pi and pi K scattering, as well as the decay eta' to eta pi pi, results in a range for the mixing angle which indicates that the quark substructure of these light scalars are closer to a four quark picture.

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