Coherent Neutral Pion and eta Meson Photoproduction on the Deuteron
2021
Coherent photoproduction of the neutral pion and eta meson on the deuteron, $$\gamma {d}$$
$$\rightarrow $$
$$\pi ^0\eta {d}$$
, has been experimentally studied at $$E_\gamma <1.15$$
GeV. The total cross section as a function of the incident energy shows a rapid increasing behavior below 1 GeV. The existing theoretical calculations well-reproduce the data including final-state interactions. We have measured the differential cross sections $$d\sigma /dM_{\pi d}$$
, $$d\sigma /dM_{\eta d}$$
, and $$d\sigma /d\Omega _d$$
in the $$\gamma d$$
center-of-mass frame for the first time. An enhancement is observed near the $$\eta d$$
threshold in $$d\sigma /dM_{\eta d}$$
, suggesting a strong $$\eta d$$
attraction. The enhancement is consistent with a predicted isoscalar $$1^-$$
$$\eta NN$$
bound state from the $$\eta NN$$
and $$\pi NN$$
coupled-channel calculation.
Keywords:
- Correction
- Source
- Cite
- Save
- Machine Reading By IdeaReader
16
References
0
Citations
NaN
KQI