<i>η</i>and η’ production in<i>p¯p</i>annihilation at rest

From measurement of \ensuremath{\eta}\ensuremath{\rightarrow}2\ensuremath{\gamma} emitted in p\ifmmode\bar\else\textasciimacron\fi{}p annihilation at rest, we have derived the yield, or its upper limit, of annihilation into two mesons p\ifmmode\bar\else\textasciimacron\fi{}p\ensuremath{\rightarrow}\ensuremath{\eta}M for M=\ensuremath{\varphi}, \ensuremath{\eta}', \ensuremath{\omega}, ${\ensuremath{\rho}}^{0}$, \ensuremath{\eta}, and ${\ensuremath{\pi}}^{0}$/\ensuremath{\gamma} (sum of ${\ensuremath{\pi}}^{0}$ and \ensuremath{\gamma}), the branching ratio of the inclusive \ensuremath{\eta} production p\ifmmode\bar\else\textasciimacron\fi{}p\ensuremath{\rightarrow}\ensuremath{\eta}X for different charge multiplicities of X, and the inclusive \ensuremath{\eta}/${\ensuremath{\pi}}^{0}$ ratio. An upper limit for the inclusive \ensuremath{\eta}' production p\ifmmode\bar\else\textasciimacron\fi{}p\ensuremath{\rightarrow}\ensuremath{\eta}'X has also been obtained.