Proceedings (PRO)

Dear colleagues,
attached the proceedings write-up of my talk at ICNFP200, TA-CON-2020-027, in Aug.2020, in Crete.
All feedback welcome by 31-Mar-2021.
Many thanks!!
Best wishes, Tassos

The antiProton ANnihilation at DArmstadt (PANDA) experiment is one of the four key experiments to be operated at the Facility for Antiproton and Ion Research (FAIR), which is currently under construction near Darmstadt/Germany. This fixed target experiment will address a wide range of open questions in the field of hadron physics. The detector consists of at target as well as a forward spectrometer to fully exploit the forward boosted collisions of antiprotons with dense hydrogen or nuclear targets.Phase-space cooled antiprotons with momenta in the range of 1.5 GeV/c to 15 GeV/c provided by the High Energy Storage Ring (HESR) allow for high precision line-shape scans. The ability to perform exclusive reconstruction of arbitrary final states enables a physics program including topics such as spectroscopy in the charmonium and open-charm region, proton structure, and hyperon and hypernuclear physics. This paper will give an overview of the PANDA experiment and highlight some of the important aspects of the physics program.

The PANDA experiment will use cooled antiproton beams with high intensity stored
in the High Energy Storage Ring at FAIR. Reactions on a fixed target will shed light on
the strong QCD with charmed hadrons.
Ring imaging Cherenkov counters are used for charged particle identification.
The status of the Barrel DIRC (Detection of Internally Reflected Cherenkov light) is described.
Its design is robust and its performance validated in experiments with test beams.
The PANDA Barrel DIRC has entered the construction phase and will be installed in 2023/2024.

The PANDA experiment is one of the pillars of the new Facility for Antiproton and Ion Research, currently under construction in Darmstadt, Germany. PANDA will be a fixed-target experiment which will study non-perturbative strong interaction phenomena in antiproton-proton collisions in the beam momentum range of 1.5 - 15 GeV/c. Strangeness production will be addressed through pbar p -> Hyperon-Antihyperon processes. The results of a feasibility study to measure the pbar p ->Sigmabar Lambda reaction, at antiproton beam momenta of 1.771 GeV/c and 6 GeV/c are presented and discussed in this paper.

Due to a high antiproton beam resolution the PANDA experiment at FAIR will offer a unique possibility to perform precise resonance energy scans. Thereby a precise line shape and width measurement of very narrow resonances like the charmonium-like X(3872), which is discussed to be exotic, becomes feasible. Monte Carlo studies have been performed, to address the achievable sensitivities of such measurements, assuming different signal cross-sections, line shapes and luminosity combinations.

Hyperons provide new angles on two of the most challenging problems in con-
temporary physics: a coherent and quantitative description of the strong in-
teraction, and the matter-antimatter asymmetry of the Universe. The produc-
tion dynamics and the electromagnetic structure of strange hyperons, as well
as hyperon spectroscopy, give insights into the strong interaction in the con-
finement domain. Furthermore, two-body decays of strange hyperons provide
clean tests of CP symmetry which provide pieces to the matter-antimatter puz-
zle. The future antiproton experiment PANDA at FAIR offers unique possibilities to study different aspects of hyperons. In particular, the hitherto almost
unexplored multi-strange sector will be addressed. The expected large production cross sections of hyperons and the versatile, near 4π
detector design makesPANDA a veritable hyperon factory already from the first phase of operation.
In these proceedings, the opportunities for hyperon physics with PANDA will be outlined. I will also address how different hyperon physics topics can benefit
from the weak hyperon decays, that provide straight-forward access to the full
spin density matrix.

Channel configuration registers of a full size prototype for the custom readout circuit of silicon
double-sided microstrips of PANDA Micro Vertex Detector were tested for upset effects. The
ASIC is developed with a commercial 110 nm CMOS technology and implements both the Triple
Modular Redundancy and the Hamming Encoding techniques. Results from tests with ion and
proton beams show the robustness level of these two techniques against the upset effects and allow
the evaluation of that commercial 110 nm technology in the PANDA experiment.

Proceedings of a poster shown at 14th Pisa Meeting on Advanced Detectors, 27 May - 2 Jun 2018,

\panda\ at FAIR will address the physics of strangeness in nuclei by several novel and unique measurements. These studies are only made possible by the
one-of-a-kind combination of the stored antiproton beam at FAIR and the modular \panda\ detector which will be complemented by a germanium detector array. The latter was made available by a cooperation with the NUSTAR collaboration.
\begin{itemize}
\item
\panda\ also offers the unique possibility to search for X-rays from very heavy hyperatoms such as e.g. $\Xi^-$-$^{208}$Pb. This will complement experiments at J-PARC which attempt to measure X-rays in light and (possibly) medium-heavy nuclei by the J-PARC E03 and E07 experiments. The measurement at \panda\ will allow to constrain the real and imaginary potential of $\Xi^-$ hyperons in the neutron skin
of the lead nucleus.
\item
\panda\ will extend the studies on double hypernuclei by performing for the first time high resolution $\gamma$-spectroscopy of these nuclei. Thus, \Panda\ complements measurements of ground state masses of double hypernuclei in emulsions at J-PARC conducted by the E07 Collaboration \cite{E07-proposal,doi:10.1142/9789814618229_0025} or the production of excited resonant states in heavy ion reactions which may, for example, be explored in future by the CBM Collaboration. Together, these measurements will provide a as yet unrivaled information on the structure of double $\Lambda\Lambda$ hypernuclei.

\item
Furthermore, the exclusive production of hyperon-antihyperon pairs close to their production threshold in $\Pap$ - nucleus collisions offers a unique and hitherto unexplored opportunity to elucidate the behaviour of antihyperons in cold nuclei which is intimately related to the short-range part of the baryonic interaction.
\end{itemize}

In all these studies, the production of low momentum {\PagL} within nuclei or slow $\Xi^-$ hyperons which can eventually be stopped in a secondary target material play an essential role.