Pseudoscalar and vector open-charm mesons at finite temperature

TL;DR

This paper investigates how pseudoscalar and vector open-charm mesons behave at finite temperature using a chiral effective field theory with heavy-quark spin symmetry, revealing medium modifications and dynamically generated states.

Contribution

It is the first self-consistent calculation of open-charm vector mesons at finite temperature, incorporating medium effects within a unified theoretical framework.

Findings

Medium-modified spectral functions of D, D*, D_s, D_s* mesons are provided.

Temperature-dependent masses and decay widths of several charm mesons are reported.

New dynamically generated states and their properties are identified.

Abstract

Vacuum and thermal properties of pseudoscalar and vector charm mesons are analyzed within a self-consistent many-body approach, employing a chiral effective field theory that incorporates heavy-quark spin symmetry. Upon unitarization of the vacuum interaction amplitudes for the scattering of charm mesons off light mesons in a fully coupled-channel basis, new dynamically generated states are searched. The imaginary-time formalism is employed to extend the calculation to finite temperatures up to $T=150$ MeV. Medium-modified spectral shapes of the $D$, $D^*$, $D_s$ and $D_s^*$ mesons are provided. The temperature dependence of the masses and decay widths of the nonstrange $D_0^*$ (2300) and $D_1^*$(2430) mesons, both showing a double-pole structure in the complex-energy plane, is also reported, as well as that of the $D_{s0}^*$(2317) and $D_{s1}^*$(2460) resonances and other states not yet identified experimentally. Being the first calculation incorporating open-charm vector mesons at finite temperature in a self-consistent fashion, it brings up the opportunity to discuss the medium effects on the open charm sector under the perspective of chiral and heavy-quark spin symmetries.