Meson assisted dibaryons

TL;DR

This paper reviews the theoretical and experimental progress on meson-assisted dibaryons, highlighting recent discoveries of non-strange and strange dibaryons, and discusses potential charm dibaryons with similar quantum numbers.

Contribution

It introduces a new class of L=0 positive-parity dibaryons stabilized by pion-baryon interactions and reviews recent experimental searches and theoretical predictions for these states.

Findings

Observation of the D_{12}(2150) dibaryon at JLab.

Discovery of the D_{03}(2380) dibaryon by WASA-at-COSY.

Ongoing searches for strange and charm dibaryons.

Abstract

We discuss a new type of L=0 positive-parity dibaryons, pion-B-B', where the dominant binding mechanism is provided by resonating p-wave pion-baryon interactions. Recent calculations of such pion assisted dibaryons are reviewed with special emphasis placed on the non-strange I(JP)=1(2+) N-Delta dibaryon D_{12}(2150) studied recently at JLab, and on the 0(3+) Delta-Delta dibaryon D_{03}(2380) discovered recently by the WASA-at-COSY Collaboration. We review recent searches by the HADES Collaboration at GSI and by the E15 and E27 Experiments at J-PARC for a strangeness S=-1 I(JP)=1/2(0-) K-pp dibaryon and perhaps also for a strange I(JP)=3/2(2+) N-Sigma(1385) pion assisted dibaryon Y_{3/2(2+)}(2270). Charm C=+1 dibaryons, predicted with these same I(JP) values, are also briefly reviewed.