Speaker
Dr
Reinhard Schumacher
(Carnegie Mellon University)
Description
The mechanism of baryon-antibaryon photoproduction has not been extensively studied.
Little is known about the dominant exchanges in the $t$-channel or the nature of baryon-like
exchanges in the $u$- channel. At GlueX, we are studying the reactions $\gamma p \to \mathcal{\overline{B}B}$$p$,
where $\mathcal{\overline{B}B}$ includes $\overline{\Lambda}\Lambda$ and $\overline{p}p$.
Kinematic fitting is used for the $\overline{\Lambda}\Lambda$ channel to extract the 5-body final
states with $\Lambda \to \pi^- p$ and $\overline{\Lambda} \to \pi^+ \overline{p}$ .
Data have been obtained from the respective reaction thresholds up to a beam energy of about 11 GeV.
Photons in the energy range between 8.4 and 9 GeV were linearly polarized, allowing examination of
observables like the beam spin asymmetry. Preliminary spectra from data obtained in Spring 2016 and Spring 2017
will be shown for the angular correlations among the produced particles. Our goal is to use spin correlations
between the $\Lambda$ hyperons to determine the angular momentum structure of the strangeness production
mechanism.
Primary author
Dr
Reinhard Schumacher
(Carnegie Mellon University)
