For the first time the experiments ALEPH, DELPHI, L3 and OPAL have presented
preliminary results for fermion-pair and photon-pair production in e+e-
collisions on the full LEP2 data set. The details of the experimental
measurements and results from their LEP-wide combination are presented. No
statistically significant deviations from the Standard Model expectations are
observed and lower limits, some obtained in dedicated analyses, for new physics
phenomena at 95 % confidence level are derived. The scales of contact
interactions are constrained to lie above 10-20 TeV, depending on the helicity
structure. The Standard Model has thus been tested at LEP2 down to distances
10^{-19} - 10^{-20} m. This has many implications, one example being the
interpretation of the new result on the anomalous magnetic moment of the muon
as coming from muon substructure. For gamma-gamma final states the QED cut-offs
are Lambda_+ > 0.44 TeV and Lambda_- > 0.37 TeV. In a combined analysis, using
e+e- and gamma-gamma final states, the most stringent lower limits to date,
M_s^+ > 1.13 TeV (lambda = +1) and M_s^- > 1.39 TeV (lambda = -1), on the low
gravity effective Planck scale are set. Constrains on the scales of string
models like TeV strings and D-branes are derived. In the last case the lower
limit is 1.5 - 4 TeV, depending on the coupling strength.Comment: 20 pages, 12 figures, 7 tables; Invited LEP2 review talk, Les
Rencontres de Physique de la Vallee d'Aoste, La Thuile, Aosta Valley, Italy,
4-10 March 2001; v2 - minor typo correcte
