Impact of a thermal medium on D mesons and their chiral partners

• Main Authors: Glòria Montaña, Àngels Ramos, Laura Tolós, Juan M. Torres-Rincon
• Format: Article
• Language: English
• Published: Elsevier 2020-07-01
• Series: Physics Letters B
• Subjects: Charmed mesons; Effective hadron theories; Finite-temperature QFT; Chiral symmetry; Heavy-quark symmetry; Chiral symmetry restoration
• Online Access: http://www.sciencedirect.com/science/article/pii/S0370269320302689

We study D and Ds mesons at finite temperature using an effective field theory based on chiral and heavy-quark spin-flavor symmetries within the imaginary-time formalism. Interactions with the light degrees of freedom are unitarized via a Bethe-Salpeter approach, and the D and Ds self-energies are calculated self-consistently. We generate dynamically the D0⁎(2300) and Ds(2317) states, and study their possible identification as the chiral partners of the D and Ds ground states, respectively. We show the evolution of their masses and decay widths as functions of temperature, and provide an analysis of the chiral-symmetry restoration in the heavy-flavor sector below the transition temperature. In particular, we analyse the very special case of the D-meson, for which the chiral partner is associated to the double-pole structure of the D0⁎(2300).