MonopolePair.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
 
 
 
'''
Example creating small sample of monopole anti-monopole pairs
with given magnetic charge (in e+ units), electric charge and mass (in GeV/c^2)
'''
import basf2 as b2
from simulation import add_simulation
from reconstruction import add_reconstruction
import pdg
import sys
 
if len(sys.argv) < 3:
    print("Expected args: magCharge elCharge mass\
    Using default: 1 0 4.5")
    mag = 1
    el = 0
    mass = 4.5
else:
    mag = float(sys.argv[1])
    el = float(sys.argv[2])
    mass = float(sys.argv[3])
 
num_events = 100
 
main = b2.create_path()
main.add_module("EventInfoSetter", expList=0, runList=1, evtNumList=num_events)
 
pdg.add_particle('monopole', 99666, mass, 1.0, el, 0.0)
pdg.add_particle('anti-monopole', -99666, mass, 1.0, -el, 0.0)
# add_particle  (name,           pdgCode, mass, width, charge, spin, max_width=None, lifetime=0, pythiaID=0)
 
# generate events
pairgen = b2.register_module('PairGen')
pairgen.param('pdgCode', 99666)
pairgen.param('saveBoth', True)
main.add_module(pairgen)
 
# Phase 2 geometry
gearbox = b2.register_module('Gearbox')
gearbox.param('fileName', '/geometry/Beast2_phase2.xml')
main.add_module(gearbox)
 
geometry = b2.register_module('Geometry')
main.add_module(geometry)
 
# detector simulation
g4sim = b2.register_module('FullSim')
g4sim.param('RegisterMonopoles', True)
g4sim.param('MonopoleMagCharge', mag)
g4sim.param('trajectoryStore', 1)
main.add_module(g4sim)
 
add_simulation(main)
add_reconstruction(main)
 
# Save output of simulation
output = b2.register_module('RootOutput')  # Set output filename
output.param('outputFileName', 'MonopolePair.root')
main.add_module(output)
 
b2.process(main)
print(b2.statistics)