Constraining the optical potential in the search for eta-mesic 4He

Abstract

A consistent description of the $dd\to$ $^{4}\hspace{-0.03cm}\mbox{He} η$ and $dd\to$ (${}^4$He$\eta$)${}_{bound}\to X$ cross sections was recently proposed with a broad range of real ($V_0$) and imaginary (W0), $\eta$-${}^4$He optical potential parameters leading to a good agreement with the d d -> 4He eta data. Here we compare the predictions of the model below the $\eta$ production threshold, with the WASA-at-COSY excitation functions for the dd -> 3He N pi reactions to put stronger constraints on (V0, W0). The allowed parameter space (with |V_0| < \sim 60 MeV and |W_0| < \sim 7 MeV estimated at 90% CL ) excludes most optical model predictions of eta-4He nuclei except for some loosely bound narrow states.

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Cited by in corpus (10)

• Etaprime and Eta Mesons with Connection to Anomalous Glue
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• Search for eta-mesic 3He in non-mesonic final states