H1prelim-05-041

Determination of Electroweak Parameters at HERA

Reference B. Portheault, presented at DIS2005, Spring 2005
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Abstract Using the e^+p and e^-p charged and neutral current cross sections previously measured by the H1 experiment, a combined electroweak and QCD analysis is performed to determine electroweak parameters accounting for their correlation with parton distributions. An improved measurement is obtained of the $W$ propagator mass in charged current ep scattering. The weak mixing angle sin^2 theta_W is derived from the W boson mass determination in the on-mass-shell renormalisation scheme. A first measurement at HERA is made of the light quark weak couplings to the Z^0 boson.
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