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Mainz 2004 – scientific programme

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T: Teilchenphysik

T 306: Trigger und DAQ III

T 306.4: Talk

Tuesday, March 30, 2004, 16:45–17:00, HS VII

Impact of a b-jet trigger on searches for tt-resonances and heavy Higgs bosons at ATLAS — •Anca Purcărea, Peter Mättig, and Jenny Böhme — Bergische Universität Wuppertal, Fachbereich Physik, Gaußstr. 20, 42097 Wuppertal

At LHC, at low luminosity, per year and per experiment about 8 million top quark pairs will be produced. The final states of fully hadronic tt-events consists of at least six jets (including two b-jets). A trigger decision has to be based on this jet information.

Due to high ET thresholds, the trigger efficiency for fully hadronic tt-events is only at the order of 20%. This efficiency could be increased by detecting two bottom jets at the LVL2 trigger, allowing to lower the energy threshold while maintaining a large rejection of QCD background events.

If b-jet identification will be available at LVL2, QCD background could be suppressed effectively. This would allow for lowering the trigger ET thresholds and thereby increasing the trigger efficiency for tt-events.

As an example the impact of introducing b-tagging into the trigger system on the discovery of tt-resonances and heavy Higgs bosons via the decay Htt is discussed. Special attention is paid to the improvement of the discovery prospects by lowering the ET thresholds of the actual jet trigger menu.

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