MEASUREMENT OF THE W BOSON MASS AND WIDTH IN DELPHI AT LEP

A measurement of the W boson mass and width has been performed by the DELPHI collaboration. During the years 1997-1999 DELPHI collected data with an interrated luminosity of 435 pb-1 at center-of-mass energies ranging from 183 to 202 GeV. LEP is currently running at energies up to 208 GeV. The DELPHI analysis and preliminary numbers presented at ICHEP 2000, Osaka, are discussed and an overview is given of improvements in statistical sensitivity and determination of systematic errors to be expected for the final analysis of the total LEP2 data sample.

INTERPRETATION OF D(2637) FROM HEAVY QUARK SYMMETRY

We demonstrate from heavy quark symmetry that the width of D(2637) claimed by the DELPHI Collaboration is inconsistent with any bound state with one charm quark predicted in the D(2637) mass region, except possibly the D-wave orbitally excited states [Formula: see text] and [Formula: see text] or the radially excited state D′. The former two possibilities are favoured by heavy quark mass relations.

A General MSSM Parameter Scan

The excluded tan β range and Higgs boson mass region in the framework of the Minimal Supersymmetric extension of the Standard Model (MSSM) depend on several parameters. The Higgs boson masses, cross-sections and branching fractions have been determined including two-loop diagrammatic calculations. The limit obtained with a more general scan over the parameter space of the MSSM are compared with those in the so-called benchmark scenario. The combination of the searches for Higgs particles in the 1999 data collected by the DELPHI collaboration at center-of-mass energies between 191.6 and 201.7 GeV allows stringent limits to be set in combination with previous DELPHI results. In addition, an interpretation in the framework of the general MSSM scan of the 2000 LEP data at the hightest energies between 201.7 and 209.0 GeV is given. We show that the current data for the HZ and hA production can be comfortably accommodated in the MSSM.

SEARCHES FOR EXOTIC PARTICLES IN e+ e- COLLISIONS WITH THE DELPHI DETECTOR

Results of searches for exotic particles by the DELPHI collaboration at CERN are prented. Highlights from the searches for Flavor Changing Neutral Currents, Technicolor, Fermiophobic Higgs and Compositeness, in the LEP 2 data are shown. No evidence for new physics was found and the excluded regions of the parameter space for each model are presented.