Chiral symmetry and light resonances in hot and dense matter |
| |
Authors: | D Cabrera D Fernández-Fraile and A Gómez Nicola |
| |
Institution: | (1) Departamento de Física Teórica II, Univ. Complutense, 28040 Madrid, Spain |
| |
Abstract: | We present a study of the π
π scattering amplitude in the σ and ρ channels at finite temperature and nuclear density within a chiral unitary framework. Meson resonances are dynamically generated
in our approach, which allows us to analyze the behavior of their associated scattering poles when the system is driven towards
chiral-symmetry restoration. Medium effects are incorporated in three ways: (a) by thermal corrections of the unitarized scattering
amplitudes, (b) by finite nuclear-density effects associated to a renormalization of the pion decay constant, and complementarily
(c) by extending our calculation of the scalar–isoscalar channel to account for finite nuclear-density and temperature effects
in a microscopic many-body implementation of pion dynamics. Our results are discussed in connection with several phenomenological
aspects relevant for nuclear-matter and heavy-ion collision experiments, such as ρ mass scaling versus broadening from dilepton spectra and chiral restoration signals in the σ channel. We also elaborate on the molecular nature of π
π resonances. |
| |
Keywords: | PACS" target="_blank">PACS 11 10 Wx 12 39 Fe 21 65 +f 25 75 -q |
本文献已被 SpringerLink 等数据库收录! |