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.

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

References in corpus (1)

• Photoproduction of eta-mesic 3He

Cited by in corpus (15)

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• Coherent photoproduction of eta-mesons off 3He - search for eta-mesic nuclei
• Is there an eta-3He quasi--bound state ?
• Interaction of eta mesons with nuclei
• Search for $\eta$-mesic nuclei in recoil-free transfer reaction
• Near threshold eta meson production in the d+d->alpha+eta reaction
• Level crossing of particle-hole and mesonic modes in eta mesic nuclei
• Formation of eta-mesic nuclei by (pi,N) reaction and N^*(1535) in medium
• Determination of the ${\mathbf{\eta }}^3\mathrm{He}$ threshold structure from the low energy $\mathbf{pd}\to {\mathbf{\eta }}^3\mathrm{He}$ reaction
• Search for Quasi Bound $\eta$ Mesons
• $\eta$-nucleus interaction from the $d+d$ reaction around the $\eta$ production threshold
• Invariant mass distributions for the pp to p p eta reaction at Q=10 MeV
• Spin observables of the reaction pd-3He eta and quasi-bound 3He-eta pole
• Systematic few-body analysis of eta-d, eta-3He and eta-4He interaction at low energies
• Non-Strange Meson Production with Hadronic Probes