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Advancements and Future Directions in LHC Experiment Validation

This document reviews the current status and open points regarding the validation of LHC experiments, particularly focusing on calorimeter performance across different configurations such as ATLAS and LHCb. It addresses key requests for validation including thin target performance and various important observables for trackers. Notably, it emphasizes the importance of studying neutron interactions and the implications of energy resolution. Recommendations for the next steps include enhancing models for particle interactions and reviewing production processes to ensure more accurate alignment with experimental data and future research prospects.

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Advancements and Future Directions in LHC Experiment Validation

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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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