Pseudoscalar and vector open-charm mesons at finite temperature

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 $D$, $D^{\ast }$, $D_s$ and $D_s^{\ast }$ mesons are provided. The temperature dependence of the masses and decay widths of the nonstrange $D_0^{\ast }$ (2300) and $D_1^{\ast }$(2430) mesons, both showing a double-pole structure in the complex-energy plane, is also reported, as well as that of the $D_{s0}^{\ast }$(2317) and $D_{s1}^{\ast }$(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.

47 pages, 10 figures, 8 tables. References added and typos removed. Additional explanations on unitarization procedure, medium modifications of pion, and cutoff parameter dependence. Version accepted for publication in Physical Review D journal