Comment on 'Photoproduction of $\eta$--Mesic ${}^3$He'

Abstract

In a recent paper by the TAPS collaboration \cite{exp} a first measurement of a bound system of an $\eta$ meson and a ${}^3$He nucleus was reported. In this comment we critically reexamine the interpretation of the data and show that the data prefers a solution where there is no bound state present. Given the low statistics of the measurement, however, it does not exclude the existence of a bound state.

Comments: Extended version of a comment sent to Phys. Rev. Lett