Photoproduction of the $\Lambda$(1520) hyperon with a 9 GeV photon beam at GlueX

TL;DR

This paper reports on the first measurements of the photoproduction of the $ ext{Lambda}(1520)$ hyperon using a 9 GeV photon beam at the GlueX experiment, aiming to understand hyperon production and aid in the search for exotic mesons.

Contribution

It presents preliminary results on $ ext{Lambda}(1520)$ photoproduction, including measurements of photon beam asymmetry and spin-density matrix elements, using the GlueX detector at JLab.

Findings

Preliminary cross section measurements for $ ext{Lambda}(1520)$ production.

First analysis of polarization observables in hyperon photoproduction.

Insights into hyperon production mechanisms at 9 GeV photon energies.

Abstract

The GlueX experiment is located at the Thomas Jefferson National Accelerator Facility (JLab) in Newport News, VA, USA. It features a hermetic 4$\pi$ detector with excellent tracking and calorimetry capabilities. Its 9 GeV linearly polarized photon beam is produced from the 12 GeV electron beam, delivered by JLab's Continuous Electron Beam Accelerator Facility (CEBAF), via bremsstrahlung on a thin diamond and is incident on a LH2 target. GlueX recently finished its first data taking period and published first results. The main goal of GlueX is to measure gluonic excitations of mesons. These so-called hybrid or exotic mesons are predicted by Quantum Chromodynamics (QCD) but haven't been experimentally confirmed yet. They can have quantum numbers not accessible by ordinary quark-antiquark pairs which helps in identifying them using partial wave analysis techniques. The search for exotic mesons requires a very good understanding of photoproduction processes in a wide range of final states, one of them being $pK^{+}K^{-}$ which contains many meson and baryon reactions. The $\Lambda$(1520) is a prominent hyperon resonance in this final state and is the subject of this presentation. This talk will give an introduction to the GlueX experiment and show preliminary results for the photoproduction of the $\Lambda$(1520) hyperon. The measurement of important observables like the photon beam asymmetry and spin-density matrix elements will be discussed and an outlook to possible measurements of further hyperon states in the $pK^{+}K^{-}$ final state will be given.