W Mass and W+W- Final State Interactions

Details W Mass and W+W- Final State Interactions W Mass and W+W- Final State Interactions

2001-05-22

arxiv.org/abs/hep-ph/0105230v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

To be published in the proceedings of Moriond EW, 10-17th March 2001

Scientific paper

Precise measurements of the mass and width of the W boson are carried out in e+e- collisions at LEP, by kinematic reconstruction of the invariant mass distributions of WW->qqlv and WW->qqqq candidate events. The most recent combination of such results from ALEPH, DELPHI, L3 and OPAL uses approximately 82% of the final LEP2 integrated luminosity and is preliminary. The mass of the W boson so determined is Mw=80.446 +-0.026+-0.030 GeV, while the corresponding direct measurement of the W boson width gives Gamma_W= 2.148+-0.071+-0.063 GeV. These measurements are subject to sizeable systematic uncertainties from the QCD phenomena of Bose-Einstein correlations and colour reconnection. Recent substantial progress in both of these areas is reported

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