Measurements of the reaction $\bar{p}p\to \varphi \eta$ of antiproton annihilation at rest at three hydrogen target densities

OBELIX Collaboration, V. Alberico, A. Bertin

The proton-antiproton annihilation at rest into the $\varphi \eta$ final state was measured for three different target densities: liquid hydrogen, gaseous hydrogen at NTP and at a low pressu…