The a₁(1260) as a Resonance in Nuclear Matter Academic Article

abstract

• We present a theoretical study of the properties of the a1 (1260) axial-vector resonance in a cold nuclear medium. In the vacuum, the a1 (1260) resonance is generated dynamically from the interactions of a pseudoscalar and vector meson ( and KK*) in a coupled channel chiral unitary approach. Medium effects are implemented through the modification of the and 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 -hole excitations including short range correlations, whereas the in-medium incorporates modifications of its virtual pion cloud as well as direct resonance-hole excitations. The resulting in-medium a1 (1260) exhibits significant broadening with increasing density as reflected in the 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.

authors

• Rapp, Ralf

published proceedings

• PROGRESS OF THEORETICAL PHYSICS

author list (cited authors)

• Cabrera, D., Jido, D., Rapp, R. F., & Roca, L.

citation count

• 4

complete list of authors

• Cabrera, Daniel||Jido, Daisuke||Rapp, Ralf Friedrich||Roca, Luis

publication date

• April 2010

publisher

• Oxford University Press (OUP)  Publisher

published in

• Progress of Theoretical Physics  Journal

keywords

• 51 Physical Sciences
• 5106 Nuclear And Plasma Physics
• 5107 Particle And High Energy Physics

Digital Object Identifier (DOI)

• 10.1143/PTP.123.719

start page

• 719

end page

• 742

volume

• 123

issue

• 4

URL

• http://dx.doi.org/10.1143/ptp.123.719