highlight_particle.py

#!/usr/bin/env python3
 

 
# given a DST file as input, this example reconstructs D*+ candidates
# and highlights all final state particles assigned to the candidate
# in the display.
 
import basf2 as b2
 
from ROOT import Belle2
import modularAnalysis as ma
 
 
class HighlighterModule(b2.Module):
    """Select all things related to a Particle"""
 
    def initialize(self):
        """reimplementation of Module::initialize()."""
 
        Belle2.PyStoreObj("DisplayData").registerInDataStore()
 
    def event(self):
        """reimplementation of Module::event()."""
 
        displayData = Belle2.PyStoreObj("DisplayData")
        displayData.create()
 
        particles = Belle2.PyStoreArray('Particles')
        for p in particles:
            if abs(p.getPDGCode()) == 413:
                b2.B2WARNING("highlighting D*+ candidate")
                # displayData.obj().select(p)
                daughters = p.getFinalStateDaughters()
                for d in daughters:
                    # selecting the MCParticle also gets the tracks
                    mcp = d.getRelated('MCParticles')
                    displayData.obj().select(mcp)
                break  # only one
 
 
main = b2.create_path()
 
main.add_module('RootInput')
main.add_module('Gearbox')
geometry = main.add_module('Geometry')
geometry.param('excludedComponents', ['ECL'])
 
 
ma.fillParticleList('K-', 'kaonID > 0.1', path=main)
ma.fillParticleList('pi+', 'pionID > 0.1', path=main)
ma.fillParticleList('gamma', '', path=main)
 
ma.reconstructDecay('pi0 -> gamma gamma', '0.110 < M < 0.150', path=main)
 
ma.reconstructDecay('D0 -> K- pi+', '1.7 < M < 2.0', path=main)
ma.reconstructDecay('D*+ -> D0 pi+', '1.9 < M < 2.1', path=main)
 
 
main.add_module(HighlighterModule())
 
main.add_module('Display')
 
b2.process(main)