DELPHI Z0 PEAK EVENT

DELPHI Event r0022479e0005888


e+ e- ---> e+ e- gamma gamma
The electrons are identified in the HPC and are e+ (4.4 GeV, right) and e- (15.6 GeV, down left). The e+ produces a shower of 4.0 GeV, but another close to its flight direction with 37.4 GeV could be due to final state radiation or bremsstrahlung in the material in front of the ID.

Two neutral showers are detected in the HPC, one with 27.6 GeV (top), the other with 10.9 GeV (up left). They are probably due to radiation from the final state electrons.