The strangeness program at GlueX

TL;DR

The GlueX experiment at Jefferson Lab investigates strange hadron production using photoproduction with polarized photons, providing new measurements of polarization observables, cross-sections, and hadron spectra to understand underlying production mechanisms.

Contribution

This paper introduces the GlueX strangeness program and reports recent experimental results on strange hadron polarization, spectra, and photoproduction, advancing the understanding of strange hadron production mechanisms.

Findings

Measured $oldsymbol{ ext{Sigma}^0}$ beam asymmetries.

Determined $oldsymbol{ ext{Lambda}(1520)}$ spin-density matrix elements.

Studied $oldsymbol{ ext{Lambda}(1405)}$ lineshape and photoproduction of $oldsymbol{ ext{Lambda}ar{ ext{Lambda}}}$ and $oldsymbol{ ext{Xi}^{(*)}}$.

Abstract

The GlueX experiment located at Jefferson Lab studies the spectrum of hadrons using photoproduction on a LH$_2$ target in a wide variety of final states. With its detector system capable of measuring neutral and charged final state particles over almost the full solid angle, and very good particle identification capabilities, GlueX can measure many different hadrons containing strangeness. A linearly polarized photon beam allows the measurement of polarization observables, which contain information about the production mechanisms involved in generating strange particles in photoproduction. In addition, GlueX can perform precise cross-section measurements, which help to study the spectrum of strange hadrons. In this presentation, the GlueX experiment is introduced, and recent progress of its strangeness program is discussed. We present recent results on $\Sigma^0$ beam asymmetries, $\Lambda$(1520) spin-density matrix elements and ongoing studies of the $\Lambda$(1405) lineshape. We also present our recent progress on measurements of $\Lambda\bar\Lambda$ and $\Xi^{(*)}$ photoproduction. Also, future prospects for strangeness measurements at GlueX are discussed.