The a_1(1260) as a ρπ Resonance in Nuclear Matter(Nuclear Physics)
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概要
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We present a theoretical study of the properties of the a_1(1260) axial-vector resonance in a cold nuclear medium. In the vacuum, the a_1(1260) resonance is generated dynamically from the interactions of a pseudoscalar and vector meson (ρπ and KK^^-^*) in a coupled channel chiral unitary approach. Medium effects are implemented through the modification of the ρ and π propagators at finite nuclear density from well established microscopic many-body calculations. The in-medium pion spectral function accounts for the coupling to N-hole and Δ-hole excitations including short range correlations, whereas the in-medium ρ incorporates modifications of its virtual pion cloud as well as direct resonance-hole excitations. The resulting in-medium a_1(1260) exhibits significant broadening with increasing density as reflected in the ρπ scattering amplitude. The possible relation of our results with partial restoration of chiral symmetry in nuclear matter is discussed in terms of in-medium Weinberg sum rules.
- 2010-04-25
著者
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CABRERA Daniel
Departamento de Fisica Teorica II, Universidad Complutense
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JIDO Daisuke
Yukawa Institute for Theoretical Physics, Kyoto University
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RAPP Ralf
Cyclotron Institute and Physics Department, Texas A & M University, College Station
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ROCA Luis
Departamento de Fisica, Universidad de Murcia
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Roca Luis
Departamento De Fisica Universidad De Murcia:yukawa Institute For Theoretical Physics Kyoto Universi
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Rapp Ralf
Cyclotron Institute And Physics Department Texas A & M University College Station
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Jido Daisuke
Yukawa Institute For Theoretical Physics Kyoto University
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Cabrera Daniel
Departamento De Fisica Teorica And Ific Centra Mixto Universidad De Valencia-csic Institutos De Inve
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RAPP Ralf
Cyclotron Institute and Physics Department, Texas A & M University, College Station
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