Study of Excited $\Xi$ Baryons with the PANDA Detector

Abstract

The study of baryon excitation spectra provides insight into the inner structure of baryons. So far, most of the world-wide efforts have been directed towards $N^{\ast }$ and $\Delta$ spectroscopy. Nevertheless, the study of the double and triple strange baryon spectrum provides independent information to the $N^{\ast }$ and $\Delta$ spectra. The future antiproton experiment PANDA will provide direct access to final states containing a $\bar{\Xi }\Xi$ pair, for which production cross sections up to $\mu$b are expected in $\bar{p}p$ reactions. With a luminosity of $L=10^{31}c{m}^{-2}{s}^{-1}$ in the first phase of the experiment, the expected cross sections correspond to a production rate of $\sim 10^6$ events$/$day. With a nearly $4\pi$ detector acceptance, PANDA will thus be a hyperon factory. In this study, reactions of the type $\bar{p}p\to {\bar{\Xi }}^{+}{\Xi }^{\ast -}$ as well as $\bar{p}p\to {\bar{\Xi }}^{\ast +}{\Xi }^{-}$ with various decay modes are investigated. For the exclusive reconstruction of the signal events a full decay tree fit is used, resulting in reconstruction efficiencies between $3\%$ and $5\%$. This allows high statistics data to be collected within a few weeks of data taking.

arXiv comment20 pages, 16 figures, corrections/changes according to the comments from the journal referees

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Cited by in corpus (1)

• Quantum number assignments of light strange baryons in Regge phenomenology