L0 Event Model

The L0 Event Model is made of four components, as is the hardware.

  • L0Calo : Inputs are extracted from the Raw Buffer, and are the 8 bit transverse energy (ECAL, HCAL) and the trigger bits for PRS and SPD. These are described in L0CaloAdc and L0PrsSpdHit. The result of the processing is L0CaloCandidate which is available in two containers, one with all non-zero candidates, and one with the highest candidate of each type. The first one is what will be put in the Raw Buffer, the second one is the input to L0 Decision Unit.

  • L0Muon: Inputs are extracted either from MuonDigit or from MuonCoord objects depending on the application options.
  • PileUpSystem

  • L0DU : Inputs are from the three other systems. An EDMS document is in preparation to specify the exact bit assignment, see EDMS 528259. The output is basically the decision, in L0DUReport. The PUS information is added in the L1 Buffer, and it is foreseen to add information in the Raw Buffer, but this is not currently done. A tentative desciption is available in LHCb Note 2003-065.

-- OlivierCallot - 26 Jul 2005

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Topic revision: r5 - 2008-10-01 - JulienCogan
 
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