The $K^- d \to \pi \Sigma n$ reaction revisited

TL;DR

This paper revisits the $K^- d o \pi \Sigma n$ reaction using high-precision theoretical methods to provide accurate predictions for upcoming experiments at J-PARC, emphasizing the advantages of the Watson approach over the truncated Faddeev approach.

Contribution

It compares the Watson and truncated Faddeev approaches for the reaction, advocating for the Watson approach due to its inclusion of nucleon potential energy effects.

Findings

Watson approach better accounts for nucleon potential energy.

Provides detailed predictions for the $K^- d o \pi \Sigma n$ reaction.

Offers spectra with integrated neutron angles for experimental comparison.

Abstract

The appearance of some papers dealing with the $K^- d \to \pi \Sigma n$ reaction, with some discrepancies in the results and a proposal to measure the reaction at forward $n$ angles at J-PARC justifies to retake the theoretical study with high precision to make accurate predictions for the experiment and extract from there the relevant physical information. We do this in the present paper showing results using the Watson approach and the truncated Faddeev approach. We argue that the Watson approach is more suitable to study the reaction because it takes into account the potential energy of the nucleons forming the deuteron, which is neglected in the truncated Faddeev approach. Predictions for the experiment are done as well as spectra with the integrated neutron angle.