July 2013 Tutorial Schedule WorkArea

Session 1, Wed 8:30am - 9:30am: Overview (Matt)

• Talk (30 min): Physics Overview and Analysis Strategy
  • Define the physics goals
  • Discuss detector
  • Discuss general analysis strategy
• Talk (15 min): A specific physics example: γp→π⁺π⁺π^-n
• Exercise (15 min): Generate γp→π⁺π⁺π^-n with intermediate resonances

Session 2, Wed 9:30am - 10:20am: Monte Carlo Generators and Detector Simulation (Mark)

• Talk (30 min): Other standard monte carlo tools (bggen, genr8, hdgeant, mcsmear)
• Exercise (20 min): Generate pythia data, run HDGeant and mcsmear

Session 3, Wed 10:45am - 11:45am: JANA/DANA (Paul)

• Talk (20 mins): Intro to JANA/DANA (factories & plugins)
  • JANA is a framework: multithreaded, factory-based (describe concept of factories, tags (e.g. BCAL)), event-processors control the work flow
  • The primary executable (hd_root) does virtually nothing by itself, the processor in your plugin tells it what to do
  • JANA automatically loops over the events in your input files, executing the primary factory & plugin methods as needed: init(), brun(), evnt(), erun(), fini()
  • hd_dump: Prints data to screen
  • DMCThrown and DKinematicData
• Exercise (10 mins):
  • Print the kinematics of the thrown particles to screen via hd_dump and inside of plugin (all three kinds)

• Talk (10 mins): Reconstruction and Data Classes
  • Track/Shower reconstruction, Hypotheses, REST format, danarest plugin
  • Basic Analysis Classes: DKinematicData, DChargedTrackHypothesis, DChargedTrack, DNeutralShower, DMCThrown, DBeamPhoton

• Exercise (20 mins):
  • Use danarest plugin to do track reconstruction.
  • Print basic analysis objects (DChargedTrackHypothesis, etc.) to screen via hd_dump and inside of plugin

Lunch, Wed 11:45am - 1:00pm

ANALYSIS Library (Paul)

Session 4, Wed 1:00pm - 1:50pm: Analysis Basics

• Talk (25 mins):
  • User specifies reaction & decay chain, library generates all particle combinations
  • Particle Combinations: Why, and why so many? (extra tracks, any PID of same q, decay products of different particles, beware double-counting), DParticleCombo contents
  • DParticleCombo contents
  • Basic example plugin: 3pi_n (go over line by line)
• Exercise (45 mins):
  • Generate 3pi_n plugin, manually histogram: #combos, #events with >= 1 combo, missing mass (calc manually), p-vs-theta & vertex-z for pi+'s and pi-'s

Session 5, Wed 1:50pm - 2:50pm: Kinematic Fitting & Analysis Details

• Talk (30 mins):
  • What it is, how it works, constraints, how neutrals & magnetic field are handled
  • Give link for setting it up manually
  • Track Preselection, PID FOM Calculation, new DTrackTimeBased for new PIDs (q+/q- subtlety), Event RF Bunch Selection, Thrown/Reconstructed track matching
• Exercise (45 mins):
  • Auto-kinematic fit 3pi_n, histogram kinematic fit confidence level, missing mass after kinematic fit (conlev > 1%)
  • Manually histogram: pid conlevs (dE/dx, timing, total)

Break, Wed 2:50pm - 3:10pm

Session 7, Wed 4:00pm - 4:50pm: Analysis Actions - Pre-existing

• Talk (25 mins):
  • Reaction-Independent (can be called manually): thrown, reconstructed track distros, gen-recon comparison (go over line-by-line on one)
  • Reaction-Dependent Histograms (executed for each combo): PID, kinfit results, missing mass, invariant mass (go over line-by-line on one)
  • Reaction-Dependent Cuts (executed for each combo): PID, kinfit conlev, missing mass, invariant mass (go over line-by-line on one)
  • #events/combos pass cuts histograms
• Exercise (25 mins):
  • Add reaction-independent analysis actions: fill histograms and look at kinematics in ROOT
  • Add reaction-dependent analysis actions: hist/cut pid, hist/cut kinematic fit results, hist missing mass before/after kinfit conlev cut

Session 8, Wed 4:50pm - 5:30pm: Analysis Actions - Custom

• Talk (15 mins):
  • Creating your own custom actions, remind to beware double-counting, warn about multi-threading issues
• Exercise (25 mins):
  • Generate custom action to make dalitz plot of 3 pions.

Session 9, Thur 8:30am - 9:30am: REST & ROOT

• Talk (25 mins):
  • REST Skims, TTree format, Making/Using a TSelector, beware double-counting when filling ROOT trees.
• Exercise (35 mins):
  • Create a skim of 3pi_n events, analyze the skim data, save the results to a root ttree, analyze the data in ROOT (make some plots)

Session 10, Thur 9:30am - 10:30am: Analyzing Decays

• Talk (5 mins):
  • Setting up DReaction
• Exercise (55 mins):
  • Make a plugin to analyze: γp→η'p, η'→ηπ⁺π^-, η→γγ
    • Do kinematic fitting, output to ROOT, histogram PID, kinfitresults, mass peaks, etc.

Boosted Decision Trees (Mike & Justin)

Session 11, Thur 10:50am - 12:20pm: BDT Introduction

• Talk (45 mins): Multivariate Analysis Overview
• Talk (20 mins):
  • Introduce TMVA, setup factory, select input variables, book methods, and training samples
• Exercise (25 mins):
  • Train BDT using 3pi_n samples, make plots of input variables and classifier response with TMVAGui

Lunch, Thur 12:20pm - 1:30pm

Session 12, Thur 1:30pm - 2:15pm: BDT Details

• Talk (20 mins):
  • Describe weight files, setup reader, evaluation on larger samples, and storing classifier response in TTree
• Exercise (25 mins):
  • Apply BDT to large background sample, compute efficiency and purity

Session 13, Thur 2:15pm - 2:45pm: BDT Details

• Talk (10 mins):
  • Describe setup for other Multivariate Classifiers
• Exercise (20 mins):
  • Try many different classifiers for 3pi_n channel and evaluate with TMVAGui

Amplitude Analysis (Matt)

Session 14, Thur 3:10pm - 4:15pm: Amplitude Analysis Introduction

• Talk (45 mins): Amplitude Analysis Fitting Strategy
• Exercise (20 mins): performing a single fit and analyzing projections

Session 15, Thur 4:15pm - 5:05pm: Amplitude Analysis Details

• Talk (30 mins): Multiple fits, opportunities for extensions
• Exercise (20 mins): performing multiple fits in different bins of a mass spectrum