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EMCAL HLT Roadmap

EMCAL HLT Roadmap. Federico Ronchetti EMCAL/HLT CERN , May 18 2011. Status and Outline. Hardware Installation Full EMCAL configuration on the HLT side Software Development: Triggers EMCAL HLT trigger decisions: cluster, jet, high pT electrons L0/L1 Online Trigger Monitoring

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EMCAL HLT Roadmap

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  1. EMCAL HLT Roadmap Federico Ronchetti EMCAL/HLT CERN, May 18 2011

  2. Status and Outline Hardware Installation • Full EMCAL configuration on the HLT side Software Development: Triggers • EMCAL HLT trigger decisions: cluster, jet, high pT electrons • L0/L1 Online Trigger Monitoring People • Manpower

  3. RCU Interface to HLT/DAQ DAQ LDC DDL Splitters DDL Optical links HLT FEP H-RORC (FPGA) 1 SM = 2 RCUs  10 SM = 20 DDL links 1 DDL link for the STU (HW jet trigger unit) RCU 1 RCU 0 B A B A

  4. Connections Layout • 1 FEP node sees a sector in phi • No changes in the online chain setup… FEPEMCAL0 C-side A-side

  5. HLT Triggers • Cluster trigger • Jet trigger • High pT electron trigger

  6. IP TPC   R candidate EMCal Clustering g-p0 discrimination: three possible cases: opening angle << cell dimension all 0’s at this energy are in jets isolation cut well separated clusters merged clusters shower shape analysis invariant mass analysis pT<10 GeV/c 10< pT< 40 GeV/c pT>40 GeV/c • Isolated if: • no particle in cone with pT > pTthres • OR • pTsum in cone, SpT < SpTthres

  7. Clustering • V1 clusterizer in place in HLT/CALO (common code for EMCAL and PHOS) • TODO: Introduce shower shape into the V1 clusterizer • Alternative: finalize the implementation of the NxN CALO clusterizer (EMCAL N=3, PHOS N=5) • TODO: debug and test the NxNclusterizer • TODO: check geometry definitions for modifications after the upgrade to 10 SM • Cluster trigger component in place (simple threshold) need review.

  8. High pTElectron Trigger • At ET>>mqheavy quark jet production probe the color charge dependence of energy loss. • C hadrons reconstructiongoes with TPC+ITS+TRD • B hadrons need fast e-trigger for pT>10 GeV/c (where no TRD) • Identification via E/pin EMCal • TPC tracks are extrapolated and matchedto EMCal clusters Main background sources: • Dalitzdecay of neutralmesons • photon conversions in ITS and beam pipe

  9. High pTElectron Trigger TODO: Provide HLT decisions for high pT electrons • Implement the track-cluster matching on HLT side • Need extrapolation method for HLT tracks (ESD) - helix propagation to XYZ point (Sergey from TPC can help) • cut on E/P (~1) for electron candidate tracks • candidates pre-selected with requirement of • pointing to the interaction vertex • Electron dE/dx from TPC – not available right now, may not be needed.

  10. Jets TODO: Provide HLT decisions for jets: • Implement a jet finder component running the anti-kT recombination algorithm; • Inputs: central barrel track (considering pT cuts) and EMCal cells (3-vectors Ex,Ey,Ez); • algorithm removes the cells matching to the tracks before next pass • extrapolation method for HLT tracks (ESD) - helix propagation to impact point on EMCal( Sergey) • Correlation with centrality information (V0 component in place)

  11. Calibration and Monitoring TODO: • Cell energy spectra per Super Module; • Display the L0 and L1 trigger primitives • Cluster spectra with L0 trigger bit set vs overall cluster distribution; Key point: Need to associate the cluster (reconstructed data) with the trigger bit (raw data)

  12. Software Development Open Issues: Need testing HLT “offline” with its AliRoot/HLT subsystem: • We can run HLT in AliRoot with simulated data • Problem with HLT in AliRoot with real data (needed to develop online calibration and monitoring tasks) last update: end of march 2011 Need to follow this up once back at CERN

  13. EMCAL/HLT People People interested in EMCal HLT AUSTIN: • Leonidas Xaplanterisat CERN (F. Ronchetti) • Summer student at LNF (P. Gianotti) CERN: • Francesco Blanco (Huston) is considering to join • Jiri Kral(Jyväskylä) may join after his assignment to L0 is over (not easy to replace him). • PhD student from S. Paolo U. at CERN on may-june could contribute on the hi-pT electron trigger. LNF: • Post Doc person? (need to define support)

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