Heidelberg 2007 – scientific programme

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T: Fachverband Teilchenphysik

T 212: Elektroschwache WW

T 212.10: Talk

Tuesday, March 6, 2007, 19:00–19:15, INF 327 SR 2

First Run II Measurement of the W Boson Mass with the Collider Detector at Fermilab — •Oliver Stelzer-Chilton — University of Oxford,Keble Road, Oxford, OX1 3RH, UK

The mass of the W boson is a fundamental parameter of the Standard Model.Through radiative corrections, the mass of the top quark and the W mass are connected to the mass of the Higgs boson. Thus, a more precise measurement of the W boson mass and the top quark mass will further constrain the mass of the Higgs boson. At the Collider Detector at Fermilab (CDF),the W boson mass is obtained from studies of the transverse momentum and transverse mass distributions of W->mu nu and W->e nu decays. This talk will present a first measurement of the W boson mass using ~200 $pb^{-1} of $sqrt(s)$=1.96 TeV ppbar collision data taken with the CDF II detector. With 63,964 W->e nu candidates and 51,128 W->mu nu candidates, we measure $M_W$ = 80413 * 34 (stat) * 34 (syst) MeV. With a total uncertainty of 48 MeV, this represents the single most precise W boson mass measurement to date.