Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
1995-04-01
Phys.Rev.Lett.75:1006-1011,1995
Physics
High Energy Physics
High Energy Physics - Experiment
14 pages, latex 2 figures appended as uuencoded file
Scientific paper
10.1103/PhysRevLett.75.1006
Deep inelastic $e^-p$ scattering has been studied in both the charged-current (CC) and neutral-current (NC) reactions at momentum transfers squared, $Q^2$, between 400 GeV$^2$ and the kinematic limit of 87500 GeV$^2$ using the ZEUS detector at the HERA $ep$ collider. The CC and NC total cross sections, the NC to CC cross section ratio, and the differential cross sections, $ d\sigma/dQ^2 $, are presented. For $Q^2 \simeq M_W^2$, where $M_W$ is the mass of the $W$ boson, the CC and NC cross sections have comparable magnitudes, demonstrating the equal strengths of the weak and electromagnetic interactions at high $Q^2$. The $Q^2$ dependence of the CC cross section determines the mass term in the CC propagator to be $M_{W} = 76 \pm 16 \pm 13$~GeV.
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