Phase-I Simulation - LAr & L1Calo Groups


This page documents activities and associated supporting information for simulation studies for the Phase-I upgrade of L1Calo. The current state-of-play is summarised here and new results, as they arrive, will be indicated. Thus, of necessity, it is an evolving document.


LAr Studies (for Phase-I TDR)

Signal Feature Reconstruction

Study Status People
Filter algorithms and energy resolution    
Pile-up and noise filtering    
Out-of-time pile-up corrections    
Impact on energy resolution from phase-shift and jitter    
Dynamic range and quantization scale    
Signal saturation    
Optimization of signal reconstruction in different eta regions and calorimeters    

EM Trigger Performance

Study Status People
Shower shape analysis in EM layers    
Optimization of shower shape variables in different eta regions    
Energy dependency of R_eta algorithms    
Multi-dimensional discriminants    
Clustering algorithms for HL-LHC    
Dependency on quantization scale    

Jet Trigger Performance

Study Status People
Evaluation jet reconstruction algorithms in inclusive triggers    
Gaussian filtering and turn-on curves    
Pileup background subtraction    
Effects of quantization scale    
Multi-jet trigger efficiency recovery    
Jet energy scale and calibration    

MET Trigger performance

Study Status PeopleSorted descending
Resolution dependency on layer weighting and layer pT thresholds; Eta dependency    
Impact of FCAL granularity on resolution and turn-on curves    
Effects of BC mis-identification on resolution    
Effects of ADC quatization scale    

Tau Trigger Performance

Study Status People
Discriminant variables for tau identification (em radius, core energy fraction, radius, cluster mass type, em fraction, sub-clusters)    
Electron veto by em isolation and em fraction    
Dependency on eta regions and detectors    

Impact of single and di-em trigger performance on physics searches

Study Status People
H -> gamma gamma    
H -> Z gamma    
H -> tau tau -> ee    
H -> WW* -> e nu    

Supporting h/w design choices

xFex TOB output multiplicities

Priority: initial results are needed by early summer 2014 as input to the eFex prototype (scheduled for manufacture early 2015) design process.

Description: this activity will study the connectivity requirements (including bandwidth, data formats, overflow handling, etc.) between the eFEX modules and L1Topo modules and the potential impact on physics triggers of any constraints or limitations in this area. The study will use realistic emulations of Trigger Objects reflecting the desired physics goals and take into account the level of pileup that is anticipated. The simulation results will feedback into the eFEX design process and as such will be both timely and have significant importance in the upgrade of L1Calo at Phase-I.

  1. Bunch train effects
  2. Consequences for L1Calo of LPDS design choices
  3. The gFex

Supporting algorithm choices




Missing Et (and other global event quantities)


Major updates:
-- RobinMiddleton - 19 Nov 2014

%RESPONSIBLE% RobinMiddleton
%REVIEW% Never reviewed

This topic: Sandbox > Atlas > TriggerDAQ > LevelOneCaloTrigger > LevelOneCaloSiteMap > L1CaloUpgradePage > L1CaloUpgradePhase1Simulation
Topic revision: r6 - 2014-11-19 - RobinMiddleton
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