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

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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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