Final state interactions in WW production

Strong Final State Interactions in γγ → WW

We study the effects of a possible strong final state interaction among longitudinal W 's in γγ → W W. The relevant partial wave amplitudes are modified by an Omnès function approximated by a Breit-Wigner form factor. We study the fractional cross section f 00 = σ LL /σ Total with both W 's longitudinally polarised, in the presence of a J = 2 resonance (M = 2.5 TeV, Γ = 500 GeV) or a J = 0 reso...

Final State Interactions in Hadronic Ww Decay at Lep

An overview is given of the study of final state interactions in hadronically decaying W pairs produced in ee-collisions as it is performed by the four LEP experiments. Bose-Einstein correlations are investigated by comparing likewith unlike-signed pairs of pions and/or using the mixed event analysis technique. Colour reconnection is examined with a method that compares the particle flow distri...

Qcd at Lep 2 and Ww Final State Interactions A

2 Final State Interactions in Pion Production from Nuclei

We have calculated the effect of the inclusion of final state interactions on pion production from nuclei with incident pion beams. We find that the effect of absorption , along with geometric considerations, explains much of the enhancement at low invariant mass seen in recent data for invariant mass spectra with increasing atomic number. While the variation among nuclei is well reproduced for...

Final State Interactions

Precise measurements of the mass and width of the W boson are carried out in e + e − collisions at Lep, by kinematic reconstruction of the invariant mass distributions of W + W − → qq ′ ℓν ℓ and W + W − → qq ′ qq ′ candidate events. The most recent combination of such results from Aleph, Delphi, L3 and Opal uses approximately 82% of the final Lep2 integrated luminosity and is preliminary. The m...