Speaker
Description
The negatively charged pions and kaons can be trapped in the Coulomb potential of atomic nucleus forming so called mesonic atoms. It is also conceivable that a neutral meson could be bound to a nucleus. In this case the binding is exclusively due to the strong interaction and hence such object can be referred to as a mesic nucleus.
The most promising candidate for such state is the $\eta$-mesic nucleus since the $\eta$-nucleon interaction is strongly attractive. The existence of the mesic nuclear matter was postulated over thirty years ago [1], however, until now it has not been confirmed experimentally. Such system in the form of the $\eta$-mesic Helium may be created for example in the deuteron-deuteron or proton-deuteron fusions [2].
Three experiments dedicated to the search for $\eta$-mesic Helium were performer up to now using the WASA detector system installed at the Cooler Synchrotron COSY at the Forschungszentrum Jülich (Germany) [2-8].
The poster will be focused on the status and perspectives of the search for the $\eta$-mesic Helium in $pd \rightarrow (^{3}He\eta)_{bound} \rightarrow pd\pi^{0} \rightarrow pd\gamma\gamma$ reaction.
$\textbf{Bibliography:}$
[1] Q. Haider, L. C. Liu, Phys. Lett. $\textbf{B 172}$, 1986, 257.
[2] M. Skurzok, W. Krzemien, O. Rundel and P. Moskal, Acta Phys.Polon. $\textbf{B 47}$, 2016, 503.
[3] P. Moskal, J. Smyrski, Acta Phys. Polon. $\textbf{B 41}$, 2010, 2281.
[4] P. Adlarson et al., Phys. Rev. $\textbf{C 87}$, 2013, 035204.
[5] P. Adlarson et al., Nucl. Phys. $\textbf{A 959}$, 2017, 102.
[6] P. Adlarson et al., Phys. Rev. Lett. $\textbf{120}$, 2018, 022002.
[7] M. Skurzok et al., Phys. Lett. $\textbf{B 782}$, 2018, 6.
[8] S. Bass, P. Moskal, Reviews of Modern Physics $\textbf{91}$, 2019, 015003.
