Publication Date:
2021-04-01
Description:
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 $$varDelta $$ Δ spectroscopy. Nevertheless, the study of the double and triple strange baryon spectrum provides independent information to the $$N^*$$ N ∗ and $$varDelta $$ Δ spectra. The future antiproton experiment $$overline{ext{ P }}$$ P ¯ ANDA will provide direct access to final states containing a $${overline{varXi }}varXi $$ Ξ ¯ Ξ pair, for which production cross sections up to $$mu ext{ b }$$ μ b are expected in $$ ar{ext{ p }}$$ p ¯ p reactions. With a luminosity of $$L=10^{31}$$ L = 10 31 cm$$^{-2}$$ - 2 s$$^{-1}$$ - 1 in the first phase of the experiment, the expected cross sections correspond to a production rate of $$sim 10^6, ext{ events }/ext{day }$$ ∼ 10 6 events / day . With a nearly $$4pi $$ 4 π detector acceptance, $$overline{ext{ P }}$$ P ¯ ANDA will thus be a hyperon factory. In this study, reactions of the type $$ ar{ext{ p }}$$ p ¯ p $$
ightarrow $$ → $${overline{varXi }}^{+}$$ Ξ ¯ + $$varXi ^{*-}$$ Ξ ∗ - as well as $$ ar{ext{ p }}$$ p ¯ p $$
ightarrow $$ → $${overline{varXi }}^{*+}$$ Ξ ¯ ∗ + $$varXi ^{-}$$ Ξ - 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.
Print ISSN:
1434-6001
Electronic ISSN:
1434-601X
Topics:
Physics
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