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W production in ep collisions at HERA |
| Reference |
A. Mehta, talk presented at ICHEP 2000, July 2000 |
| Document |
Conference paper
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| Contact |
Christinel Diaconu, Andrew Mehta, Nick Malden |
| Abstract |
A search for $W$ boson production in the process $ep o eW X$, with subsequent $W$ decay into electrons or muons, has been performed at the electron-proton collider HERA using an integrated luminosity of 13.6 pb$^{-1}$ in $e^-p$ scattering and 81.6 pb$^{-1}$ in $e^+p$ scattering. The analysis has been tuned to maximise the acceptance of $W$ boson production, and reject other Standard Model processes. In $e^-p$ interactions no events are observed, consistent with the expectation of the Standard Model in this low luminosity sample. In the $e^+p$ data 14 events are seen in the electron and muon channel compared to an expectation of 8.2 $\pm$ 2.0 dominated by W production (6.4 $\pm$ 1.9). The excess above the expectation is mainly due to events with transverse momentum of the hadronic system greater than 25 GeV where 9 events are found compared to 2.3 $\pm$ 0.6 expected. Four of these events are observed in the latest data sample, presented for the first time here. |
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