DN interaction from meson exchange

TL;DR

This paper develops a meson-exchange model for DN interactions, dynamically generating the Lambda_c(2595) resonance and comparing results with existing models, emphasizing the role of coupled channels and SU(4) symmetry.

Contribution

It introduces a novel meson-exchange model for DN interactions based on SU(4) symmetry, incorporating vector meson exchange and higher-order diagrams, and dynamically generates the Lambda_c(2595) resonance.

Findings

The model reproduces the Lambda_c(2595) as a DN quasi-bound state.

It predicts DN cross sections consistent with other models.

The model highlights the importance of coupled pi-Sigma_c channels.

Abstract

A model of the DN interaction is presented which is developed in close analogy to the meson-exchange KbarN potential of the Juelich group utilizing SU(4) symmetry constraints. The main ingredients of the interaction are provided by vector meson (rho, omega) exchange and higher-order box diagrams involving D*N, D\Delta, and D*\Delta intermediate states. The coupling of DN to the pi-Lambda_c and pi-Sigma_c channels is taken into account. The interaction model generates the Lambda_c(2595) resonance dynamically as a DN quasi-bound state. Results for DN total and differential cross sections are presented and compared with predictions of an interaction model that is based on the leading-order Weinberg-Tomozawa term. Some features of the Lambda_c(2595) resonance are discussed and the role of the near-by pi-Sigma_c threshold is emphasized. Selected predictions of the orginal KbarN model are reported too. Specifically, it is pointed out that the model generates two poles in the partial wave corresponding to the Lambda(1405) resonance.