A one-month HIAF simulation projects branching-ratio upper limits of about 10^-9 (e+e-) and 10^-6 (pi pi) for eta decays to a dark scalar, with parameter sensitivities beyond current bounds.
The legacy of the experimental hadron physics programme at COSY
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The experimental hadronic physics programme at the COoler SYnchrotron of the Forschungszentrum Juelich terminated at the end of 2014. After describing the accelerator and the associated facilities, a review is presented of the major achievements in the field realized over the twenty years of intense research activity.
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Simulation of dark scalar particle sensitivity in $\eta$ rare decay channels at HIAF
A one-month HIAF simulation projects branching-ratio upper limits of about 10^-9 (e+e-) and 10^-6 (pi pi) for eta decays to a dark scalar, with parameter sensitivities beyond current bounds.