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Trigger Update for Physics pp v1: New Muons and Modified Egamma and JetTauETmiss Streams

The latest update from the Higgs meeting on August 6, 2010, outlines significant changes to the trigger system for Physics pp v1 data, starting from data period E (run 160296 and later). Important modifications include replacing Muons with MuonswBeam, retuning Egamma triggers, and updating L1Calo streams. Additionally, there are enhancements to muon algorithms to improve efficiency in low B-field regions and adjustments to L1_MU6 and L1_MU10 due to lower-than-expected performance. A bug in the jet triggers is acknowledged, affecting event selection, which will be resolved soon.

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Trigger Update for Physics pp v1: New Muons and Modified Egamma and JetTauETmiss Streams

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  1. Higgs Meeting – 06/08/2010 Trigger Update • Physics_pp_V1 menu now online – starting from data period E (run 160296 and later) • New streams! • Muons replaces MuonswBeam • Egamma and JetTauETmiss replace L1Calo • MinBias keeps the same name • Egamma triggers have been re-tuned – starting from data period E1 (run 160387 and later) • Shower shape description in MC not perfect – cuts tuned on MC were rejecting few % W electrons • Cut on shower shape loosened to increase efficiency • Muon trigger changes • L2 muon algorithm (muFast) thresholds tuned to improve efficiency in regions with low B field • Rate increase means we may need mu10_medium/_tight above L=5x1031cm-2s-1 • L1_MU6 and L1_MU10 efficiency lower than expected – 5% effect in barrel, 10% effect in endcap • Changing HLT chains to be seeded from L1_MU0 instead of L1_MU6/10, to recover efficiency • Bug found in jet triggers – HLT in passthrough, but rejects events where no jet was found • Lost 0.64% of events selected by L1_J5 (central), but 41% of events selected by L1_FJ5 (forward) • Affects only data period E and will be fixed soon (likely this week) • Time-alignment of L1Calo towers in transition region between barrel and endcap • Currently triggering on presampler only before summing over presampler + barrel + endcap • Efficiency likely to change once this happens

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