Скачать или смотреть Webinar Thermal modification of open-charm mesons from an effective hadronic theory by G. Montaña

By Gloria Montaña (ICCUB)

The quark-gluon plasma (QGP) is expected to be produced with heavy-ion collisions at RHIC and LHC at very high temperatures and vanishing baryon densities. Due to the large mass and relaxation time of the c quark, charmed mesons are a powerful probe of the QGP and a proper theoretical understanding of their propagation in a hot medium is required. While lattice QCD is becoming an increasingly important tool in this regime, we employ a complementary theoretical approach that allows us to reach the QGP transition from the hadronic phase. In particular, we study the modification of open-charm mesons in a hot mesonic medium below Tc within an effective field theory based on chiral and heavy-quark spin-flavor symmetries within the imaginary-time formalism [1,2]. The in-medium unitarized amplitudes of the scattering of the heavy mesons with the pseudoscalar light mesons and the ground-state self-energies are calculated self-consistently. I will show that the D(*) and D_s(*) mesons acquire a substantial width and their masses drop with increasing temperatures, and that the excited mesonic states generated dynamically in our heavy-light molecular model (D_0^*(2300), D_1^*(2430), D_{s0}^*(2317) and D_{s1}^*(2460)) are also modified in a thermal medium. Besides, from the thermal ground-state spectral functions, we have computed for the first time open-charm Euclidean correlators that can be compared with those obtained with lattice QCD [3].
[1] G. Montaña, A. Ramos, L. Tolos and J. M. Torres-Rincon, Phys. Lett. B 806 (2020), 135464 doi:10.1016/j.physletb.2020.135464 [arXiv:2001.11877].
[2] G. Montaña, A. Ramos, L. Tolos and J. M. Torres-Rincon, (Submitted to Phys.Rev.D) [arXiv:2007.12601].
[3] G. Montaña, O. Kaczmarek, L. Tolos and A. Ramos, (Submitted to Eur.Phys.J.A) [arXiv:2007.15690].