Berlin 2005 – wissenschaftliches Programm
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T: Teilchenphysik
T 210: Strukturfunktionen
T 210.8: Vortrag
Freitag, 4. März 2005, 15:45–16:00, TU H4105-4106
Deep Inelastic Charged Current Events at HERA II and their Triggering using Neural Networks at H1 — •Ringailė Plačakytė1, Christian Kiesling1, and Jens Zimmermann2 — 1Max-Planck-Institut für Physik, München, Germany — 2Forschungszentum Jülich GmbH and Max-Planck-Institut für Physik, München, Germany
The longitudinal lepton beam polarisation at HERA opens the opportunity for new sensitive tests of the electroweak interactions and physics beyond the Standard Model.
Deep inelastic e±p-scattering with the exchange of a W± (charged current reaction) is of particular interest due to the polarisation dependence of the cross section of such reactions. Since the neutrino escapes detection, a feature of these events is a large missing transverse momentum. The selection of charged current events at the H1 experiment is based on this typical signature.
In order to handle high background rates H1 uses a four level trigger system. On the second trigger level correlations from the different level 1 trigger systems can be exploited. One solution for this pattern recognition task are feed forward neural networks, implemented in the hardware of the Level 2 Neural Network trigger. The development, testing and splendid results of a new network specialised for charged current events is presented.