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Modifications of the Rho Meson from the Virtual Pion Cloud in Hot and Dense Matter | | M. Urban
; M. Buballa
; R. Rapp
; J. Wambach
; | | Date: |
1 Oct 1999 | | Journal: | Nucl.Phys. A673 (2000) 357-374 | | Subject: | nucl-th hep-ph | | Abstract: | The modification of the rho-meson self-energy due to the coupling to in-medium pions is calculated consistently at finite baryon density and temperature, keeping the full 3-momentum dependence in a gauge invariant way. As a function of nucleon density, the rho-meson spectral function is strongly enhanced in the invariant mass region M < 650 MeV, while the maximum, i.e. the pole mass, is slightly shifted upwards. As a function of temperature, for fixed nucleon density, the imaginary part of the self-energy increases further due to Bose-enhancement. At the same time the mass shift from the real part becomes very large. As a consequence of these medium effects, the dilepton rate in the low-mass region M < 650 MeV increases strongly, while the peak at M = 770 MeV disappears. | | Source: | arXiv, nucl-th/9910004 | | Services: | Forum | Review | PDF | Favorites | |
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