Study of excited $$\varvec{\varXi }$$ Ξ baryons with the $$\overline{\text{ P }}$$ P ¯ ANDA detector
2021
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 $$N^*$$
and $$\varDelta $$
spectroscopy. Nevertheless, the study of the double and triple strange baryon spectrum provides independent information to the $$N^*$$
and $$\varDelta $$
spectra. The future antiproton experiment $$\overline{\text{ P }}$$
ANDA will provide direct access to final states containing a $${\overline{\varXi }}\varXi $$
pair, for which production cross sections up to $$\mu \text{ b }$$
are expected in $$\bar{\text{ p }}$$
p reactions. With a luminosity of $$L=10^{31}$$
cm
$$^{-2}$$
s
$$^{-1}$$
in the first phase of the experiment, the expected cross sections correspond to a production rate of $$\sim 10^6\, \text{ events }/\text{day }$$
. With a nearly $$4\pi $$
detector acceptance, $$\overline{\text{ P }}$$
ANDA will thus be a hyperon factory. In this study, reactions of the type $$\bar{\text{ p }}$$
p $$\rightarrow $$
$${\overline{\varXi }}^{+}$$
$$\varXi ^{*-}$$
as well as $$\bar{\text{ p }}$$
p $$\rightarrow $$
$${\overline{\varXi }}^{*+}$$
$$\varXi ^{-}$$
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.
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