Generators for Gamma Gamma Physics in DELPHI

• Traditionally, gamma-gamma events are simulated in DELPHI with the TWOGAM generator.
• Leptonic final states can be generated with the BDK(RC) generator instead. The original name of this generator(s) is DIAG36 (4fermion final state) and RADCOR (multiperipheral diagram with radiative corrections). Anti-EXCALIBUR cuts preventing the double counting are optionally available in BDK.
• PHOJET
• PYTHIA
• HERWIG

• No-tag gamma-gamma selection
• Problems in background estimate

Questions and Comments to S.Todorova (nova@mail.cern.ch)