Spectral Red-Shift Versus Broadening from Photon and Dilepton Spectra

Jan-e Alam, Pradip Roy, Sourav Sarkar, Bikash Sinha

Published 2001-06-18, updated 2003-01-10Version 2

We estimate the photon and dilepton emission rates from hot hadronic matter with in-medium spectral shift and broadening of vector mesons. It is observed that both the WA98 photon data and CERES/NA45 dilepton data can be well reproduced with similar initial conditions. The freeze-out condition has been constrained by the transverse mass spectra of pions and protons measured by the NA49 collaboration. We argue that simultaneous measurement of the $p_T$ spectra of single photons as well as invariant mass distribution of dileptons is crucial to understand the in-medium spectral function of the vector mesons.