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Typical QED events in e+e reactions
One and twophoton e+e reactions
The TwoPhoton Process
27 other sections not shown
250 MeV binning beam axis beam energy Bhabha events candidate Central Cerenkov charge multiplicity charged particles charged tracks consistent crystal triplet CSPl table decay mode detector analysis detector information double-tagged events drift chambers effective mass electron and positron energy calibration energy deposition energy resolution event selection 250 events with charged excluding tags exclusive final final state particles four-momentum hadronic final high mass event interaction point ionization K.P.N.P. event selection kaon leptons luminosity Mass spectrum mini-beta missing mass missing mass resolution missing mass study muon Nal and SHW Nal array Nal calorimeter O.N.E. event selection O.N.E. sample particle identification particle multiplicity PEP-4 and PEP-9 PEP-9 detector planes projection chamber radiation lengths ring scattered electrons selection 250 MeV selection 500 sense wires shower counter shown in figure SHW calorimeter Single tag single-tag solid angle sphericity subrun tapes two-photon process virtual particle virtual photon