Pion-assisted charmed dibaryon candidate

TL;DR

This paper investigates a potential new charmed dibaryon state using a three-body model with chiral quark interactions, predicting a narrow resonance or bound state near 3370 MeV, which could be the lowest-lying C=+1 dibaryon.

Contribution

It introduces a novel three-body model for the Lambda_c-N system and predicts a possible narrow charmed dibaryon resonance or bound state.

Findings

Predicted a narrow bound state requiring isospin violation.

Identified a narrow resonance below the Sigma_c(2455)-N threshold.

Estimated the resonance mass around 3370 MeV.

Abstract

The Lambda_c(2286)-N system is studied in a chiral constituent quark model and the resulting s-wave interaction is used in separable form within three-body models of the pi-Lambda_c-N system with quantum numbers (C,I,JP)=(+1,3/2,2+). Separable interactions are also used for the dominant p-wave pion-baryon channels dominated by the Delta(1232) and Sigma_c(2520) resonances. Faddeev equations with relativistic kinematics are solved on the real axis to search for bound states and in the complex plane to search for three-body resonances. Some of the models considered generate a very narrow bound state, requiring isospin violation for its strong decay. Other models lead to a narrow resonance (Gamma < 0.4 MeV) for resonance mass below the Sigma_c(2455)-N threshold. This would be the lowest-lying C=+1 dibaryon, with mass estimated approximately as 3370+/-15 MeV.