RT Journal Article
T1 Chiral symmetry and light resonances in hot and dense matter
A1 Cabrera, Daniel
A1 Fernández Fraile, Daniel
A1 Gómez Nicola, Ángel
AB We present a study of the pi pi scattering amplitude in the sigma and rho 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 rho mass scaling versus broadening from dilepton spectra and chiral restoration signals in the sigma channel. We also elaborate on the molecular nature of pi pi resonances.
PB Springer
SN 1434-6044
YR 2009
FD 2009-06
LK https://hdl.handle.net/20.500.14352/44578
UL https://hdl.handle.net/20.500.14352/44578
LA eng
NO © Springer-Verlag / Società Italiana di Fisica 2008.International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions (3. 2008. Isla de La Toja, España).We acknowledge financial support from Spanish research projects FPA2004-02602, FPA2005-02327, PR34/07-1856-BSCH, UCM-CAM 910309/08, FPA2007-29115-E and from the F.P.I. Programme (BES-2005-6726). D.C. wishes to thank support from the “Juan de la Cierva” Programme (Ministerio de Educación y Ciencia, Spain)
NO Spanish research projects
NO Ministerio de Educacion y Ciencia (Spain)
NO UCM-CAM
DS Docta Complutense
RD 7 abr 2025