# Role of scalar mesons in the beam asymmetry of $p \bar p$ and $\Lambda \bar \Lambda$ photoproduction at JLab

## TL;DR

This paper models the beam asymmetry in proton-antiproton and lambda-antilambda photoproduction at JLab by including scalar mesons as mixed states of glueballs and quarkonia, providing predictions to guide experimental searches.

## Contribution

It introduces a novel effective hadronic Lagrangian approach incorporating scalar mesons as mixed states to explain beam asymmetry in specific photoproduction reactions.

## Key findings

- Scalar mesons significantly influence beam asymmetry.
- Model predictions can guide experimental searches at JLab.
- Estimated contributions of heavier scalar mesons included.

## Abstract

We suggest a description of the beam asymmetry in $p \bar p$ and $\Lambda \bar \Lambda$ photoproduction off the proton $\vec\gamma + p \to p \bar p + p$ and $\vec\gamma + p \to \Lambda \bar\Lambda + p$, takes into account the contribution of the scalar mesons $f_0(1370)$, $f_0(1500)$, and $f_0(1710)$. These scalars are considered as mixed states of a glueball and nonstrange and strange quarkonia in the framework based on the use of effective hadronic Lagrangians. Present results can be used to guide the possible search for this reaction by the GlueX Collaboration at JLab. Also, we did an estimate of contribution of heavier scalar meson states $f_0(2020)$, $f_0(2100)$, and $f_0(2200)$.