Baryon -- anti-Baryon Photoproduction

Abstract

Baryon - anti-baryon photoproduction off a proton target is being studied in detail at Jefferson Lab with the GlueX Experiment. We observe $p\bar{p}$ and, for the first time, $\Lambda \bar{\Lambda }$ photoproduction (with $\Lambda \to {\pi }^{-}p$, $\bar{\Lambda }\to {\pi }^{+}\bar{p}$) from thresholds up to $E_{\gamma }=11.4$ GeV. Preliminary spectra from data accumulated during the GlueX Phase-I period are shown. Angular distributions of the photoproduced hyperons indicate more than one production mechanism in the reaction channel $\gamma p\to \Lambda \bar{\Lambda }p$. A Monte Carlo simulation with four mechanisms, tested through comparison between simulation and experimental data, is presented.

arXiv comment8 pages, 13 figures, MENU 2019 conference proceedings

References in corpus (4)

• Observation of a near-threshold enhancement in th p pbar mass spectrum from radiative J/psi-->gamma p pbar decays
• Observation of a cross-section enhancement near mass threshold in $e^{+}{e}^{-}\to \Lambda \bar{\Lambda }$
• Role of scalar mesons in the beam asymmetry of $p\bar{p}$ and $\Lambda \bar{\Lambda }$ photoproduction at JLab
• Observation of $\gamma p\to \Lambda \bar{\Lambda }p$ with GlueX at Jefferson Lab

Cited by in corpus (3)

• The strangeness program at GlueX
• $\Lambda \bar{\Lambda }$ final-state interaction in the reactions $e^{+}{e}^{-}\to \varphi \Lambda \bar{\Lambda }$ and $e^{+}{e}^{-}\to \eta \Lambda \bar{\Lambda }$
• Baryon-antibaryon photoproduction cross sections off the proton