Journal article

Publication year: 1998

Pages: 109-127

Journal: Nuclear Physics A: Nuclear and Hadronic Physics

Volume number: 632

Issue number: 1

ISSN: 0375-9474

Open access status: Green

DOI Link: https://doi.org/10.1016/S0375-9474(98)00803-3

Publisher: Elsevier

Abstract: 
We calculate the modification of a rho meson in nuclear matter through its coupling to resonance-hole states. Starting from a recently proposed model, we include all four star resonances up to 1.9 GeV. In contrast to previous works, we include not only resonances that couple to the rho in a relative p-wave, but also those that couple to an s-wave state. In addition, we solve the equation for the rho spectral function self-consistently. We find that s-wave resonances affect the in medium spectral function of the rho strongly. Tn the transverse channel the rho meson is, especially at non-zero momentum, completely washed out and can in the presence of nuclear matter no longer be viewed as a resonant excitation of the vacuum. Instead, our model shows a continuum of possible excitations with the quantum numbers of a transversely polarized rho. In the longitudinal channel, however, the rho retains its resonant character in our calculation. As a consequence of the self-consistent treatment we also find a strong enhancement of the widths of the included nucleon resonances in medium. (C) 1998 Elsevier Science B.V.

Harvard Citation style: Peters, W., Post, M., Lenske, H., Leupold, S. and Mosel, U. (1998) The spectral function of the rho meson in nuclear matter, Nuclear Physics A: Nuclear and Hadronic Physics, 632(1), pp. 109-127. https://doi.org/10.1016/S0375-9474(98)00803-3

APA Citation style: Peters, W., Post, M., Lenske, H., Leupold, S., & Mosel, U. (1998). The spectral function of the rho meson in nuclear matter. Nuclear Physics A: Nuclear and Hadronic Physics. 632(1), 109-127. https://doi.org/10.1016/S0375-9474(98)00803-3