Exotic baryons from a heavy meson and a nucleon - Positive parity states -

TL;DR

This paper investigates exotic heavy baryons formed by a heavy meson and a nucleon, highlighting the role of pion exchange and tensor forces in binding these states with positive parity.

Contribution

It introduces a model for heavy baryons with exotic flavor quantum numbers, emphasizing the significance of tensor forces from pion exchange in their binding mechanism.

Findings

Identification of DbarN and BN resonant states with specific J^P and I quantum numbers.

Demonstration of the importance of tensor forces in binding heavy baryon systems.

Resonant states predicted in multiple spin-parity channels.

Abstract

We study heavy baryons with exotic flavor quantum numbers formed by a heavy meson and a nucleon (DbarN and BN) with positive parity. One pion exchange interaction, providing a tensor force, dominates as a long range force to bind the DbarN and BN ystems. In the heavy quark mass limit, pseudoscalar meson and vector meson are degenerate and the binding mechanism by the tensor force analogous to that in the nuclear systems becomes important. As a result, we obtain the DbarN and BN resonant states in the J^P=1/2^+, 3/2^+ and 5/2^+ channels with I=0.