PHOTON EVENTS WITH MISSING ENERGY IN E+E- COLLISIONS AT SQRT(S) = 130 TO 209 GEV

The data collected with the DELPHI detector during the years 1999 and 2000 at centre-of-mass energies between 191GeV and 209GeV was combined with earlier data to search for phenomena beyond the Standard Model. The measured number of light neutrino families was consistent with three and the absence of an excess of events beyond that predicted by the Standard Model processes was used to set limits on new physics. Both model-independent searches and searches for new processes predicted by supersymmetric and extra-dimensional models have been made. Limits on new non-standard model interactions between neutrinos and electrons were also determined.