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Setting Limits on Supersymmetry Using Simplified Models

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Published on: November 15, 2013

Quark forces from hadronic spectroscopy.

Dan Pirjol¹, Carlos Schat

¹Department of Particle Physics, National Institute for Physics and Nuclear Engineering, 077125 Bucharest, Romania.

Physical Review Letters

|June 13, 2009

Summary

We explored quark interactions in excited baryons, finding two mass and mixing angle correlations. These findings constrain models and suggest pure gluon-exchange interactions are unlikely.

Area of Science:

Particle Physics
Quantum Chromodynamics
Hadron Spectroscopy

Background:

Understanding the internal structure of baryons is crucial for testing fundamental interactions.
Negative parity L=1 excited baryons provide a unique laboratory for studying quark dynamics.

Purpose of the Study:

To investigate the spin-flavor structure of negative parity L=1 excited baryons.
To derive model-independent correlations from the most general two-body quark-quark interaction Hamiltonian.
To test the validity of the pure gluon-exchange model and probe for three-body quark interactions.

Main Methods:

Utilizing the most general two-body quark interaction Hamiltonian.
Deriving theoretical correlations among masses and mixing angles of excited baryon states.

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Comparing derived correlations with experimental data.

Main Results:

Two specific correlations among masses and mixing angles were derived.
These correlations provide constraints on the mixing angles of the excited baryon states.
The pure gluon-exchange model was found to be disfavored by the available data.

Conclusions:

The derived correlations are model-independent and applicable regardless of hadronic wave function assumptions.
The results suggest that the simple pure gluon-exchange model is insufficient to describe the observed baryon properties.
The study provides a framework for further investigation into multi-body quark interactions in hadrons.