Study of Excited $\hat{I}ž$ 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 $\hat{I}”$ spectroscopy. Nevertheless, the study of the double and triple strange baryon spectrum provides independent information to the $N^{\ast }$ and $\hat{I}”$ spectra. The future antiproton experiment PANDA will provide direct access to final states containing a $\bar{\hat{I}}ž\hat{I}ž$ pair, for which production cross sections up to $\hat{I}¼$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 $4\ddot{I}€$ detector acceptance, PANDA will thus be a hyperon factory. In this study, reactions of the type $\bar{p}p\to \bar{\hat{I}}{ž}^{+}\hat{I}{ž}^{\ast -}$ as well as $\bar{p}p\to \bar{\hat{I}}{ž}^{\ast +}\hat{I}{ž}^{-}$ 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.

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