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Title: Energy-weighted sum rules for mesons in hot and dense matter
Author: Cabrera, D.
Polls Martí, Artur
Ramos Gómez, Àngels
Tolós Rigueiro, Laura
Keywords: Partícules (Matèria)
Fenomenologia (Física)
Phenomenological theory (Physics)
Issue Date: 6-Oct-2009
Publisher: American Physical Society
Abstract: We study energy-weighted sum rules of the pion and kaon propagator in nuclear matter at finite temperature. The sum rules are obtained from matching the Dyson form of the meson propagator with its spectral Lehmann representation at low and high energies. We calculate the sum rules for specific models of the kaon and pion self-energy. The in-medium spectral densities of the K and (K) over bar mesons are obtained from a chiral unitary approach in coupled channels that incorporates the S and P waves of the kaon-nucleon interaction. The pion self-energy is determined from the P-wave coupling to particle-hole and Delta-hole excitations, modified by short-range correlations. The sum rules for the lower-energy weights are fulfilled satisfactorily and reflect the contributions from the different quasiparticle and collective modes of the meson spectral function. We discuss the sensitivity of the sum rules to the distribution of spectral strength and their usefulness as quality tests of model calculations.
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It is part of: Physical Review C, 2009, vol 80. núm. 4, p. 045201-1-045201-11
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Appears in Collections:Publicacions de projectes de recerca finançats per la UE
Articles publicats en revistes (Física Quàntica i Astrofísica)

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