Abstract
For a deeper insight into the mechanisms of non-perturbative QCD it is essential to understand the excitation pattern of baryons. Up to now only the nucleon excitation spectrum has been subject to systematic experimental studies, while very little is known on excited states of double or triple strange baryons. In studies of antiproton-proton collisions the PANDA experiment is well-suited for a comprehensive baryon spectroscopy program in the multi-strange sector. A large fraction of the inelastic pp cross section is associated to final states with a baryon-antibaryon pair together with additional mesons, giving access to excited states both in the baryon and the antibaryon channel. For final states containing a 𝚵+ 𝚵- pair, cross sections up to µb are expected, corresponding to production rates of ~ 106/d at a luminosity L = 1031 cm-2 s-1. This study focuses on excited 𝚵- states decaying into ΛK-. A strategy to reconstruct the reaction pp → 𝚵+ 𝚵* and its charge conjugate channel with the PANDA detector will be presented.
Highlights
StudiesBeside the investigation of the signal, a study of about 100 million background events at the identical pmomentum of 4.6 GeV/c are generated
With the full decay tree fit a reconstruction efficiency of 5.4 % was achieved for Ξ+ Λ K− and 5.5 % for Ξ− Λ K+, and the purity for both samples is about 98 %
The comparison between the reconstructed values for the masses and widths of the Ξ resonances with the input, shows that the masses for both resonances are in good agreement with the input
Summary
In QCD the elementary particles of the strong interaction are quarks and gluons, whereas the minimum quark content of hadrons observable in nature is either three quarks (baryons) or a quark-antiquark pair (mesons). How these composite systems emerge is far less well understood. To understand the inner structure of baryons and mesons it is necessary to study the excitation pattern of these particles. The study of Ξ baryons will provide independent information on the excitation pattern and allows to verify if the picture deduced from the excited nucleon and Δ states is correct and has a general validity for baryons in the light quark sector. With the PANDA detector it will be possible to access the excited states of Ξ+ and Ξ− directly
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