Two-photon production processes at high energy. III

Abstract

We discuss several two-photon processes in the energy region covered by the new e +e -colliding-beam machines at DESY and SLAC. ,,In particular we study the observable cross section for q, (and 7,) production using (1) its two-y decay mode and (2) missing-mass techniques. We also discuss the singlephoton' production of new heavy leptons in the presence of a two-photon background via a measurement of the visible energy. Other methods for reducing the two-photon contamination are discussed.

Measurement of the cross section of W-boson pair production at LEP

“…The following Monte Carlo event generators are used to simulate the background processes: KK2f [19], PYTHIA [20], BHAGENE3 [21] and BHWIDE [22] for fermion-pair production, denoted as e + e − → ff(γ); TEEGG [23] for radiative e + e − → e + e − γ(γ) events; DIAG36 [24] and LEP4F [25] for two-photon collisions with lepton-pair final states and PHOJET [26] for two-photon collisions with hadronic final states.…”

Study of the hadronic photon structure function F2 at LEP

“…e + e hadrons are e + e ! e + e + , simulated by the program of Vermaseren et al [15], and e + e ! hadrons, simulated by JETSET [16].…”

Measurement of W-pair cross sections in e+e− interactions at =183 and W-decay branching fractions

“…+ (); + ()); BHAGENE3 [16], BHWIDE [17] and TEEGG [18] (e + e ! e + e ()), DIAG36 [19] and LEP4F [20] (leptonic two-photon collisions); PHO-JET [21] (hadronic two-photon collisions). The response of the L3 detector is modelled with the GEANT [22] detector simulation program which includes the eects of energy loss, multiple scattering and showering in the detector materials and in the beam pipe.…”