Eur. Phys. J. A 10, 101-107
Probing meson spectral functions with double differential dilepton spectra in heavy-ion collisions
B. Kämpfer1 and O.P. Pavlenko1, 21 Forschungszentrum Rossendorf, PF 510119, 01314 Dresden, Germany
2 Institute for Theoretical Physics, 252143 Kiev - 143, Ukraine
Kaempfer@fz-rossendorf.de
(Received: 16 November 2000 / Revised version: 8 January 2001 Communicated by A. Schäfer)
Abstract
The double differential dilepton spectrum
at fixed transverse mass 
allows a direct
access to the vector meson spectral functions. Within a fireball model
the sensitivity of
against variations
of both the in-medium properties of mesons and the dynamics of the
fireball is investigated.
In contrast to the integrated invariant-mass spectrum
dN/dM2, in the spectrum
with fixed
the 
signal is clearly seen as bump riding on the
background even in case of strong in-medium modifications.
25.75.-q - Relativistic heavy-ion collisions.
25.75.Dw - Particle and resonance production.
24.10.Cn - Hydrodynamic models.
© Società Italiana di Fisica, Springer-Verlag 2001
