2023 Impact factor 2.6
Hadrons and Nuclei

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, 2

1  Forschungszentrum Rossendorf, PF 510119, 01314 Dresden, Germany
2  Institute for Theoretical Physics, 252143 Kiev - 143, Ukraine


(Received: 16 November 2000 / Revised version: 8 January 2001 Communicated by A. Schäfer)

The double differential dilepton spectrum $dN/ (dM^2 dM_\perp^2)$ at fixed transverse mass $M_\perp$ allows a direct access to the vector meson spectral functions. Within a fireball model the sensitivity of $dN/ (dM^2 dM_\perp^2)$ 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 $dN/ (dM^2 dM_\perp^2)$ with fixed $M_\perp$ the $\omega$ signal is clearly seen as bump riding on the $\rho$ 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