Electroproduction ratios of Baryon-Meson states and Strangeness Suppression

TL;DR

This paper extends the quark model to include sea quarks, predicting electroproduction ratios of baryon-meson states that align with experimental data, and proposes new measurements to further explore nucleon structure.

Contribution

An extended quark model incorporating sea quarks predicts electroproduction ratios and strangeness suppression consistent with experimental results, offering new testable predictions.

Findings

Predicted ratios match Jlab experimental data.

Strangeness suppression factor agrees with CERN results.

Proposed new experiments to test nucleon sea quark structure.

Abstract

We describe the electroproduction ratios of baryon-meson states from nucleon, inferring from the sea quarks in the nucleon using an extension of the quark model that takes into account the sea. As a result we provide, with no adjustable parameters, the predictions of ratios of exclusive meson-baryon final states:$\Lambda K^+$, $\Sigma ^{*}K$, $\Sigma K$, $p\pi^0$, and $n\pi^+$. These predictions are in agreement with the new Jlab experimental data showing that sea quarks play an important role in the electroproduction. We also predicted further ratios of exclusive reactions that can be measured and tested in future experiments. In particular, we suggested new experiments on deuterium and tritium. Such measurements can provide crucial test of different predictions concerning the structure of nucleon and its sea quarks helping to solve an outstanding problem. Finally, we computed the so called strangeness suppression factor, $\lambda_s$, that is the suppression of strange quark-antiquarks compared to nonstrange pairs, and we found that our finding with this simple extension of the quark model is in good agreement with the results of Jlab and CERN experiments.