Electroweak: W mass and width
•Tag W by decay to hard isolated e,m •Calorimetry scale set by Z, resonances (J/y) •Obtain m(W), G(W) from transverse mass fit
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With 2 fb-1:
s(W), s(Z) ­ 12 %
m(W) measured to 40 MeV (sys. dominated - theory)
G(W) measured to 30 MeV
couplings measured to ~0.3
LEP2 limit ~ 40 MeV       Systematics energy scale, radiative corrections, will hit sys. limit in run 2
Run 1 limit ?
Main sys on MW theoretical (pdf, pt(W), qcd h.o. corrections).. 30 MeV (better prediction than run 1; 75 MeV)
Pdf main systemtatic (25 MeV, to reduce must raise min MT(W) used for fitting .. this is most sensitive to it)
Lepton energy scale … 20 MeV
… dominated by lepton energy scale in ev in run 1a + stats