Quark Forces from Hadron Spectroscopy

TL;DR

This paper investigates the spin-flavor structure of negative parity L=1 excited baryons using a general two-body quark interaction Hamiltonian, deriving mass-mixing angle correlations and testing gluon-exchange models against experimental data.

Contribution

It introduces a comprehensive analysis of quark interactions in baryons, deriving new correlations that constrain mixing angles and challenge the pure gluon-exchange model.

Findings

Pure gluon-exchange model is disfavored by data

Derived correlations among masses and mixing angles

Constraints on three-body quark interactions

Abstract

We consider the implications of the most general two-body quark-quark interaction Hamiltonian for the spin-flavor structure of the negative parity L=1 excited baryons. Assuming the most general two-body quark interaction Hamiltonian, we derive two correlations among the masses and mixing angles of these states, which constrain the mixing angles, and can be used to test for the presence of three-body quark interactions. We find that the pure gluon-exchange model is disfavored by data, independently of any assumptions about the hadronic wave functions.