Study of the $η$-nucleus interaction in the $p d \to ^3He η$ reaction near threshold

Details Study of the $η$-nucleus interaction in the $p d \to ^3He η$ reaction near threshold Study of the $η$-nucleus interaction in the $p d \to ^3He η$ reaction near threshold

2001-12-21

arxiv.org/abs/nucl-th/0112065v2

Physics

Nuclear Physics

Nuclear Theory

16 pages, LaTex, including 6 figures

Scientific paper

A detailed study of the effect of the $\eta$-nucleus final state interaction (FSI) in the $p d \to ^3$He$ \eta$ reaction close to threshold is presented. The FSI is incorporated through a T-matrix for $\eta ^3$He elastic scattering, constructed using few body equations. This T-matrix accounts for off-shell and binding effects in $\eta$-nucleus scattering. The energy dependence of the data on the $p d \to ^3$He$ \eta$ reaction near threshold is reproduced only after including the FSI. The off-shell and binding effects in $\eta ^3$He scattering are found to be important. Given the uncertainty in the knowledge of the elementary $\eta$-nucleon interaction, the sensitivity of the $ p d \to ^3$He$ \eta$ cross section to different prescriptions of the elementary t-matrix, $t_{\eta N \to \eta N}$ is also discussed.

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