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Multi-lepton events at HERA |
| Reference |
C. Vallee, presented at DIS 2006, Spring 2006 |
| Document |
Conference paper
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| Figures |
(1)
(2)
(3)
(4)
| | Tables |
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| Contact |
E. Sauvan, C. Diaconu |
| Abstract |
A search for multi-lepton (electron or muon) events at high
transverse momenta is performed on a data sample collected in $e^\pm p$
collisions with the H1 detector at HERA during the period 1994-2005. This
data sample corresponds to an integrated luminosity of 275 pb$^{-1}$,
which includes 52 pb$^{-1}$ of $e^{+}p$ data taken in 2004 and 105 pb$^{-1}$
of $e^{-}p$ data taken in 2005.
With respect to the published HERA I multi-electron and multi-muon analyses,
additional topologies with high $P_T$ electrons and muons are investigated.
Yields of di-lepton and tri-lepton events are measured and
a general good agreement is found with the Standard Model (SM) predictions.
Combining all channels, four events are observed with a scalar sum of lepton
transverse momenta ($\sum P_T $) greater than 100 GeV, compared to a SM
expectation of 1.1 $\pm$ 0.2. The four events with $\sum P_T >$ 100 GeV are observed in $e^{+}p$
collisions only where the SM expectation is of 0.6 $\pm$ 0.1. |
| Comments | This updates the multilepton part of H1prelim-05-165 |
| Links |
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