Study of excited Ξ baryons with the P ¯ANDA detector

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 $$N^*$$\n and $$\\varDelta $$\n spectroscopy. Nevertheless, the study of the double and triple strange baryon spectrum provides independent information to the $$N^*$$\n and $$\\varDelta $$\n spectra. The future antiproton experiment $$\\overline{\\text{ P }}$$\n ANDA will provide direct access to final states containing a $${\\overline{\\varXi }}\\varXi $$\n pair, for which production cross sections up to $$\\mu \\text{ b }$$\n are expected in $$\\bar{\\text{ p }}$$\n p reactions. With a luminosity of $$L=10^{31}$$\n cm\n $$^{-2}$$\n s\n $$^{-1}$$\n in the first phase of the experiment, the expected cross sections correspond to a production rate of $$\\sim 10^6\\, \\text{ events }/\\text{day }$$\n . With a nearly $$4\\pi $$\n detector acceptance, $$\\overline{\\text{ P }}$$\n ANDA will thus be a hyperon factory. In this study, reactions of the type $$\\bar{\\text{ p }}$$\n p $$\\rightarrow $$\n $${\\overline{\\varXi }}^{+}$$\n $$\\varXi ^{*-}$$\n as well as $$\\bar{\\text{ p }}$$\n p $$\\rightarrow $$\n $${\\overline{\\varXi }}^{*+}$$\n $$\\varXi ^{-}$$\n 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.