rho -> pi pi decay in nuclear medium

Details rho -> pi pi decay in nuclear medium rho -> pi pi decay in nuclear medium

2001-03-10

arxiv.org/abs/nucl-th/0103027v2

Nucl.Phys. A696 (2001) 870-893

Physics

Nuclear Physics

Nuclear Theory

30 pages, 7 figures, modified version

Scientific paper

10.1016/S0375-9474(01)01146-0

We calculate the medium modifications of the rho pi pi vertex in a relativistic hadronic framework, incorporating nucleons and Delta(1232) isobars. We find a substantial increase of the rho pi pi coupling, dominated by processes where the Delta is excited. The coupling depends significantly on the virtuality of the rho, which is related to analytic properties of the vertex function. We analyze the general case of a non-zero three-momentum of the rho with respect to the nuclear medium, and evaluate the resulting widths and spectral strength in the transverse and longitudinal channels for the rho -> pi pi decay. These widths are used to obtain the dilepton yields from rho decays in relativistic heavy-ion collisions.

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