The mass of the W boson has been measured by the LEP collaborations from the
data recorded during the LEP2 programme at e+ e- centre of mass energies from
161 to 209 GeV, giving the result : mw = 80.450 +/- 0.039 GeV/c^2. This paper
discusses the measurements of the W Mass from direct reconstruction of the
invariant mass of the WW decay products, particular emphasis is placed on the
evaluation of systematic errors. Results on the direct measurement of the W
width are also presented.Comment: Contribution to XXXVIIth Moriond Electroweak Conference, March 2002.
6 pages, 3 figures This version with typos correcte
