Exotic mesons with double charm and bottom flavor

TL;DR

This paper investigates exotic mesons with double charm and bottom flavors as molecular states of heavy mesons, identifying bound and resonant states through coupled channel Schrödinger equations considering pion exchange forces.

Contribution

It systematically classifies and studies exotic double heavy flavor mesons as molecular states using heavy quark effective theory and coupled channel analysis.

Findings

Identification of bound and resonant states with various quantum numbers.

Strong tensor force from pion exchange influences state formation.

Systematic classification up to J ≤ 2.

Abstract

We study exotic mesons with double charm and bottom flavor, whose quark configuration is \bar{Q}\bar{Q}qq. This quark configuration has no annihilation process of quark and antiquark, and hence is a genuinely exotic states. We take a hadronic picture by considering the molecular states composed of a pair of heavy mesons, such as DD, DD* and D*D* for charm flavor, and BB, BB* and B*B* for bottom flavor. The interactions between heavy mesons are derived from the heavy quark effective theory. All molecular states are classified by I(J^P) quantum numbers, and are systematically studied up to the total angular momentum J \leq 2. By solving the coupled channel Schrodinger equations, due to the strong tensor force of one pion exchanging, we find bound and/or resonant states of various quantum numbers.