Centrality and transverse momentum dependence of collective flow in 158 A GeV Pb + Pb collisions measured via inclusive photons

Directed and elliptic flow of inclusive photons near mid-rapidity in 158 A GeV Pb + Pb collisions has been studied. The data have been obtained with the photon spectrometer LEDA of the WA98 experiment at the CERN SPS. The flow strength has been measured for various centralities as a function of pT and rapidity over 0.18