Charm and Strangeness with Heavy-Quark Spin Symmetry

TL;DR

This paper develops a model incorporating heavy-quark spin symmetry to dynamically generate and analyze charmed and strange baryon resonances, comparing results with experimental data and exploring implications for dense nuclear matter and D-mesic nuclei.

Contribution

The paper extends the SU(3) Weinberg-Tomozawa chiral Lagrangian to SU(8) spin-flavor symmetry, incorporating heavy-quark spin symmetry and flavor symmetry breaking to generate baryon resonances.

Findings

Generated negative parity resonances across isospin, spin, strangeness, and charm sectors.

Compared model results with experimental data and other theoretical models.

Analyzed open-charm meson spectral functions in dense matter, discussing implications for D-mesic nuclei.

Abstract

We study charmed and strange baryon resonances that are generated dynamically within a unitary meson-baryon coupled-channel model which incorporates heavy-quark spin symmetry. This is accomplished by extending the SU(3) Weinberg-Tomozawa chiral Lagrangian to SU(8) spin-flavor symmetry and implementing a strong flavor symmetry breaking. The model generates dynamically resonances with negative parity in all the isospin, spin, and strange and charm sectors that one can form from an s-wave interaction between pseudoscalar and vector meson multiplets with $1/2^+$ and $3/2^+$ baryons. Our results are compared with experimental data from several facilities as well as with other theoretical models. Moreover, we obtain the properties of charmed pseudoscalar and vector mesons in dense matter within this coupled-channel unitary effective model by taking into account Pauli-blocking effects and meson self-energies in a self-consistent manner. We obtain the open-charm meson spectral functions in this dense nuclear environment, and discuss their implications on the formation of $D$-mesic nuclei at FAIR energies.