2018 Impact factor 4.843
Particles and Fields
Eur. Phys. J. C 12, 411-428
DOI 10.1007/s100529900280

Measurement of high-Q2 charged-current e+p deep inelastic scattering cross sections at HERA

The ZEUS Collaboration

J. Breitweg - et al.

Argonne National Laboratory, Argonne, IL, USA

Received: 7 July 1999 / Published online: 21 December 1999

The e+p charged-current deep inelastic scattering cross sections, $d\sigma/dQ^2$ for Q2 between 200 and 60000 GeV2, and $d\sigma/dx$ and $d\sigma/dy$ for Q2 > 200 GeV2, have been measured with the ZEUS detector at HERA. A data sample of 47.7 pb-1, collected at a center-of-mass energy of 300 GeV, has been used. The double-differential cross-section $d\sigma/dQ^2$falls by a factor of about 50000 as Q2 increases from 280 to 30000 GeV2. The double differential cross section $d^2\sigma/dxdQ^2$ has also been measured. A comparison between the data and Standard Model (SM) predictions shows that contributions from antiquarks ( $\overline{u}$ and $\overline{c}$) and quarks (d and s) are both required by the data. The predictions of the SM give a good description of the full body of the data presented here. A comparison of the charged-current cross-section $d\sigma/dQ^2$ with the recent ZEUS results for neutral-current scattering shows that the weak and electromagnetic forces have similar strengths for Q2above M2W, M2Z. A fit to the data for $d\sigma/dQ^2$ with the Fermi constant GF and MWas free parameters yields $G_F = \left(
1.171 {\pm 0.034} \,{\rm (stat.)}
^{+0.026}_{-0.032} \,{\rm (syst.)}
^{+0.016}_{-0.015} \,{\rm (PDF)}
\right)\times10^{-5}\,{\rm GeV^{-2}}$and $M_W = 80.8 ^{+4.9}_{-4.5} \,{\rm (stat.)}
^{+5.0}_{-4.3} \,{\rm (syst.)}
^{+1.4}_{-1.3} \,{\rm (PDF)~GeV}$. Results for MW, where the propagator effect alone or the SM constraint between GF and MW have been considered, are also presented.

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