Measurement of High-Q^2 Charged-Current e^+p Deep Inelastic Scattering Cross Sections at HERA

Abstract

The e^+p charged-current deep inelastic scattering cross sections, $d\sigma /d{Q}^2$ for Q^2 between 200 and 60000 GeV^2, and $d\sigma /dx$ and $d\sigma /dy$ for Q^2 > 200 GeV^2, 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 cross section $d\sigma /d{Q}^2$ falls by a factor of about 50000 as Q^2 increases from 280 to 30000 GeV^2. The double differential cross section $d^2\sigma /dxd{Q}^2$ has also been measured. A comparison between the data and Standard Model (SM) predictions shows that contributions from antiquarks ($\bar{u}$ and $\bar{c}$) 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 $d\sigma /d{Q}^2$ with the recent ZEUS results for neutral-current scattering shows that the weak and electromagnetic forces have similar strengths for Q^2 above $M_W^2,M_Z^2$. A fit to the data for $d\sigma /d{Q}^2$ with the Fermi constant $G_F$ and $M_W$ as free parameters yields $G_F=(1.171\pm 0.034(stat.{)}_{-0.032}^{+0.026}(syst.{)}_{-0.015}^{+0.016}(PDF))\times 10^{-5}Ge{V}^{-2}$ and $M_W=80.8_{-4.5}^{+4.9}(stat.{)}_{-4.3}^{+5.0}(syst.{)}_{-1.3}^{+1.4}(PDF)GeV$. Results for $M_W$, where the propagator effect alone or the SM constraint between $G_F$ and $M_W$ have been considered, are also presented.

34 pages including 10 figures and 6 tables; added tables for correlated and uncorrelated systematic uncertainties and fixed the total systematic uncertainty for dsigma/dxdQ2 (Table 4 and Figs.7-8); erratum submitted to Eur. Phys. J

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