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Validation for LHC experiments

Validation for LHC experiments. 11.09.2012. Content. Current status O pen points LHCb request What should we do next for LHC validation. Current status. simplified calorimeter ATLAS TileCal , LHCb HAD Fe/ Scintilator ATLAS ECal Pb / Ar ATLAS HEC Cu/ Ar ATLAS FCal W/ Ar

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Validation for LHC experiments

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  1. Validation for LHC experiments 11.09.2012

  2. Content • Current status • Open points • LHCb request • What should we do next for LHC validation

  3. Current status • simplified calorimeter • ATLAS TileCal, LHCb HAD Fe/Scintilator • ATLAS ECalPb/Ar • ATLAS HEC Cu/Ar • ATLAS FCal W/Ar • CMS ECalPb/WO4 • LHCb EM Pb/Scinilator • CALICE W/Scintilator • ZEUS Pb/Scintlator

  4. Open points • resolution • lateral shower shape • non conservation of important quantities

  5. LHCb request • validation of thin target • observables relevant for trackers • multiplicity • cross sections

  6. What should be done next? • Neutron interactions (even at low-E) are very important to study details of showers • Only study so far to show clear effect in lateral shower shape • In some cases (time structure) are mandatory to correctly describe data • Preliminary results: Doppler broadening not needed (import CPU time saving) • Need dedicated validation of neutrons on scintillators (recoil of H nuclei) • Adding of a cascade backend to string model (to de-excite nucleus) • Hints that can make shower longer (FTF has discrepancy between TileCal and CALICE) • Improve agreement with data for resolution • A review/tune of π0 production from FTF could: • Reduce visible energy (that is at the moment too high) • Increase agreement for resolution

  7. Naive proposal • We have not yet studied in detail the role of Precompound/deexitation model for HEP experiments • But we know it is very important and we need it. I would not be surprised if in the future it will become an “hot” topic • CALICE data show FTF_BIC is not so bad... • And we have thin-target data showing BIC is even the best model in some cases • A possible future “universal physics list for calorimetry” n:HP + BERP + p,n:BIC + FTF+BIC/BERP

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