Estimation of the ratio of the pn -> pn pi0 pi0/pn -> d pi0 pi0 cross sections

TL;DR

This paper estimates the decay ratio of a hypothesized dibaryon resonance into specific channels using final state interaction theory, suggesting it should be observable in both decay modes if it exists.

Contribution

It provides a weakly model-dependent estimate of the decay ratio for a proposed dibaryon resonance into pn pi0 pi0 and d pi0 pi0 channels.

Findings

The decay rate into pn pi0 pi0 is comparable to that into d pi0 pi0 if the resonance exists.

The sum of decay modes accounts for most inelasticity in the relevant partial waves.

The resonance should be observable in both decay channels.

Abstract

Evidence has recently been presented for the existence of a dibaryon of mass 2380 MeV/c^2 and width 70 MeV/c^2, which decays strongly into the d pi0 pi0 channel [M. Bashkanov et al., Phys.Rev.Lett. 102 (2009) 052301; P. Adlarson et al., arXiv:1104.0123]. The decay rate of such a hypothesised dibaryon into the {pn}_{I=0} pi0 pi0 channel is estimated in a weakly model-dependent way by using final state interaction theory. It is shown that, if the resonance exists, it should then show up as strongly in this channel as in d pi0 pi0. The sum of the two decay modes would saturate most of the inelasticity predicted in the relevant partial waves in the 2380 MeV/c^2 region.