SillyGeneratorModule Class Reference

Inheritance diagram for SillyGeneratorModule:

Public Member Functions
def	initialize (self)
def	event (self)

Detailed Description

Small module to demonstrate how the registration of StoreArrays works from Python

Definition at line 23 of file register_pystorearray.py.

Member Function Documentation

event()

def event

(

self

)

 Access and fill the registered StoreArray 

Definition at line 31 of file register_pystorearray.py.

    def event(self):
        """ Access and fill the registered StoreArray """
        # Alternative access by name
        mcParticles = Belle2.PyStoreArray("MCParticles")
        mcParticle = mcParticles.appendNew()
 
        # Fill one test muon for demonstration
        vertex = ROOT.TVector3(0, 0, 0)
 
        # Sample a random momentum vector of
        # gaus distributed length and uniform distibuted  direction
        phi = ROOT.gRandom.Uniform(0.0, 2.0 * math.pi)
        costheta = ROOT.gRandom.Uniform(-1.0, 1.0)
        theta = math.acos(costheta)
        momentum = ROOT.Math.XYZVector(math.sin(theta) * math.cos(phi), math.sin(theta) * math.sin(phi), costheta)
 
        mcParticle.setPDG(13)
        mcParticle.setMassFromPDG()
        mcParticle.addStatus(Belle2.MCParticle.c_PrimaryParticle)
        mcParticle.addStatus(Belle2.MCParticle.c_StableInGenerator)
        mcParticle.setProductionVertex(vertex)
        mcParticle.setMomentum(momentum)
        m = mcParticle.getMass()
        mcParticle.setEnergy(math.sqrt(momentum * momentum + m * m))
        mcParticle.setDecayTime(float("inf"))
 
 

initialize()

def initialize

(

self

)

 Register a StoreArray on the DataStore

Definition at line 26 of file register_pystorearray.py.

    def initialize(self):
        """ Register a StoreArray on the DataStore"""
        mcParticles = Belle2.PyStoreArray(Belle2.MCParticle.Class())
        mcParticles.registerInDataStore()
 

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The documentation for this class was generated from the following file:

• framework/examples/register_pystorearray.py