H1prelim-07-166
H1 and ZEUS |
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Multi-electron Events at HERA (H1+ZEUS) |
| Reference |
Preliminary result for LP07, Summer 2007 |
| Document |
Conference paper or talk
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| Figures |
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| Contact |
E.Sauvan, Jolanta Sztuk (ZEUS) |
| Abstract |
A search for multi-electron events at high
transverse momenta is performed on a data sample collected in $e^\pm p$
collisions with the H1 and ZEUS detectors at HERA during the period 1994--2007. This
data sample corresponds to an integrated luminosity of 0.94 fb$^{-1}$.
Yields of di-electron and tri-electron events are measured and
in general a good agreement is found with the Standard Model (SM) predictions.
Combining the two channels, six events are observed with a scalar sum of electron transverse momenta, $\sum P_T $, greater than 100 GeV, compared to a SM expectation of 3.0 $\pm$ 0.3.
Five of those events are observed in $e^{+}p$ collisions where the SM expectation is of 1.8 $\pm$ 0.2, whereas one event is observed in $e^{-}p$ data for a SM prediction of 1.2 $\pm$ 0.1. |
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