# Intrinsic light and strange quark--antiquark pairs in the proton and nonperturbative strangeness suppression

## TL;DR

This paper investigates the intrinsic light and strange quark-antiquark pairs in the proton using an extended chiral constituent quark model, comparing theoretical predictions with CLAS experimental data to understand nonperturbative strangeness suppression.

## Contribution

It introduces a comprehensive analysis of all possible five-quark Fock states in the proton to explain quark-antiquark ratios, advancing understanding of nonperturbative strangeness.

## Key findings

- The model aligns with CLAS data on quark ratios.
- Intrinsic five-quark states significantly influence proton structure.
- Insights into nonperturbative mechanisms affecting strangeness suppression.

## Abstract

The CLAS Collaboration recently reported measured ratios of pion and kaon electroproduction cross sections from a proton target and extracted the ratios for light and strange quark--antiquark pairs, ${u\bar{u}}/ {d\bar{d}}$ and ${s\bar{s}}/ {d\bar{d}}$. Within an extended chiral constituent quark formalism, we investigate contributions to those ratios from the nonperturbative mechanism due to all possible intrinsic $|uudQ \bar{Q}\rangle$ Fock states in the proton; with $Q \bar{Q} \equiv u\bar{u},~ d\bar{d},~s\bar{s},~c\bar{c}$. Our results are compared with the CLAS data and findings from other phenomenological approaches, offering insights into the manifestations of the genuine five--quark Fock states in the proton and its relevance to interpreting the experimental data.