A direct Measurement of the W Boson Width in ppbar Collisions at sqrt(s) = 1.96 TeV

Details A direct Measurement of the W Boson Width in ppbar Collisions at sqrt(s) = 1.96 TeV A direct Measurement of the W Boson Width in ppbar Collisions at sqrt(s) = 1.96 TeV

2007-10-22

arxiv.org/abs/0710.4112v3

Phys.Rev.Lett.100:071801,2008

Physics

High Energy Physics

High Energy Physics - Experiment

submitted to Phys. Rev. Lett. Version 3: update with PRL reviewer comments

Scientific paper

10.1103/PhysRevLett.100.071801

A direct measurement of the total decay width of the W boson G_W is presented using 350 pb-1 of data from ppbar collisions at sqrt(s) = 1.96 TeV collected with the CDF II detector at the Fermilab Tevatron. The width is determined by normalizing predicted signal and background distributions to 230185 W candidates decaying to enu and munu in the transverse-mass region 50 < M_T < 90 GeV and then fitting the predicted shape to 6055 events in the high-M_T region, 90 < M_T < 200 GeV. The result is G_W = 2032 +/- 45 (stat.) +/- 57 (syst.) MeV, consistent with the standard model expectation.

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