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, for Q2 between 200 and 60000 GeV2, and and 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 falls by a factor of about 50000 as Q2 increases from 280 to 30000 GeV2. The double differential cross section has also been measured. A comparison between the data and Standard Model (SM) predictions shows that contributions from antiquarks ( and ) 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 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 with the Fermi constant GF and MWas free parameters yields and . Results for MW, where the propagator effect alone or the SM constraint between GF and MW have been considered, are also presented.
Copyright Springer-Verlag 2000