Abstract
The production of real W and Z bosons has been studied in epcollisions at HERA. A combined analysis is performed with the data taken with the H1 and ZEUS de- tectors corresponding to 0.98fb −1 of integrated luminosity to search for events containing an isolated electron or muon and missing transverse momentum, which is dominated by single W production. The total single W boson production cross section is measured as 1.06 ± 0.16(stat.) ± 0.07(sys.)pb, in agreement with the Standard Model (SM) expec- tation of 1.26 ± 0.19pb. The production of Z bosons has been studied in the reaction ep → eZp (∗) , where p (∗) stands for a proton or a low-mass nucleon resonance, using a data sample collected with the ZEUS detector amounting to 0.5fb −1 . The Z is measured in the hadronic decay mode. The cross section of the reaction ep → eZp (∗) is measured to be 0.13 ± 0.06(stat.) ± 0.01(syst.)pb, in agreement with the SM prediction of 0.16pb.
Highlights
IntroductionAre background processes for some physics beyond the Standard Model (SM)
H1 and ZEUS reported that measured cross sections agree well with the Standard Model (SM) predictions in whole Q2 range. These results proved the calculations of the virtual exchanges of W and Z bosons in ep collisions in a wide Q2 range
The total systematic uncertainties determined in the combined analysis are found to be the same as those derived by the individual experiments
Summary
Are background processes for some physics beyond the SM. This note reports on the results of the W and Z bosons cross-section measurements in ep collisions at HERA. More details of both analyses can be found in [4] and [5]
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