Particle database¶

Loading the default database¶

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from expertsystem.state import particle
from expertsystem.ui import load_default_particle_list

print("Before loading:", len(particle.DATABASE))
load_default_particle_list()
print("After loading:", len(particle.DATABASE))

Finding particles¶

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particle.DATABASE.find(333)

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subset = particle.DATABASE.find_subset("Delta")
list(subset)

Adding custom particle definitions through Python¶

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omega = particle.DATABASE["omega(782)"]
omega

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from expertsystem.data import Particle

new_omega = Particle(
    name=omega.name,
    pid=omega.pid,
    mass=omega.mass,
    width=0.01,
    state=omega.state,
)
particle.DATABASE.add(new_omega)
particle.DATABASE["omega(782)"].width

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energies_mev = [4180, 4220, 4420, 4600]
template_particle = particle.DATABASE["EpEm (4230 MeV)"]
for counter, energy_mev in enumerate(energies_mev, 1):
    energy_gev = energy_mev / 1e3
    new_particle = Particle(
        name=f"EpEm ({energy_mev} MeV)",
        pid=template_particle.pid,
        mass=energy_gev,
        width=template_particle.width,
        state=template_particle.state,
    )
    particle.DATABASE.add(new_particle)
len(particle.DATABASE)

In [ ]:

list(particle.DATABASE.find_subset("EpEm"))

Loading custom definitions from a YAML file¶

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print("Sigmas before loading:", list(particle.DATABASE.find_subset("Sigma")))
particle.load_particles("additional_particles.yml")
print("Sigmas after loading: ", list(particle.DATABASE.find_subset("Sigma")))

Writing to XML or YAML¶

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from expertsystem import io

io.write(instance=particle.DATABASE, filename="dumped_particle_list.xml")
io.write(instance=particle.DATABASE, filename="dumped_particle_list.yaml")

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from expertsystem.data import ParticleCollection

output = ParticleCollection()
output += particle.DATABASE["J/psi"]
output += particle.DATABASE.find(22)  # gamma
output += particle.DATABASE.find_subset("f")
output += particle.DATABASE.find_subset("pi")
io.write(output, "particle_list_selection.yml")
list(output)

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import yaml
from expertsystem import io

with open("dumped_particle_list.yaml") as stream:
    definition = yaml.load(stream, Loader=yaml.SafeLoader)
io.yaml.validation.particle_list(definition)