def test_eq():
particle = Particle(
name="MyParticle",
pid=123,
mass=1.2,
spin=1,
charge=0,
isospin=Spin(1, 0),
)
assert particle != Particle(
"MyParticle", pid=123, mass=1.5, width=0.2, spin=1)
same_particle = deepcopy(particle)
assert particle is not same_particle
assert particle == same_particle
assert hash(particle) == hash(same_particle)
different_labels = Particle(
name="Different name, same QNs",
pid=753,
mass=1.2,
spin=1,
charge=0,
isospin=Spin(1, 0),
)
assert particle == different_labels
assert hash(particle) == hash(different_labels)
assert particle.name != different_labels.name
assert particle.pid != different_labels.pid
def test_exceptions():
with pytest.raises(FrozenInstanceError):
test_state = Particle(
"MyParticle",
123,
mass=1.2,
width=0.1,
spin=1,
charge=0,
isospin=Spin(1, 0),
)
test_state.charge = 1 # type: ignore
with pytest.raises(ValueError):
Particle(
name="Fails Gell-Mann–Nishijima formula",
pid=666,
mass=0.0,
spin=1,
charge=0,
parity=Parity(-1),
c_parity=Parity(-1),
g_parity=Parity(-1),
isospin=Spin(0.0, 0.0),
charmness=1,
)
def test_hash():
spin1 = Spin(0.0, 0.0)
spin2 = Spin(1.5, -0.5)
assert {spin2, spin1, deepcopy(spin1),
deepcopy(spin2)} == {
spin1,
spin2,
}
class TestGellmannNishijima:
@staticmethod
@pytest.mark.parametrize(
"state",
[
Particle(
"p1",
1,
spin=0.0,
mass=1,
charge=1,
isospin=Spin(1.0, 0.0),
strangeness=2,
),
Particle(
"p1",
1,
spin=1.0,
mass=1,
charge=1,
isospin=Spin(1.5, 0.5),
charmness=1,
),
Particle(
"p1",
1,
spin=0.5,
mass=1,
charge=1.5, # type: ignore
isospin=Spin(1.0, 1.0),
baryon_number=1,
),
],
)
def test_computations(state: Particle):
assert GellmannNishijima.compute_charge(state) == state.charge
assert (GellmannNishijima.compute_isospin_projection(
charge=state.charge,
baryon_number=state.baryon_number,
strangeness=state.strangeness,
charmness=state.charmness,
bottomness=state.bottomness,
topness=state.topness,
) == state.isospin.projection # type: ignore
)
@staticmethod
def test_isospin_none():
state = Particle("p1", 1, mass=1, spin=0.0, charge=1, isospin=None)
assert GellmannNishijima.compute_charge(state) is None
class TestSpin:
@staticmethod
def test_init_and_eq():
isospin = Spin(1.5, -0.5)
assert isospin == 1.5
assert float(isospin) == 1.5
assert isospin.magnitude == 1.5
assert isospin.projection == -0.5
@staticmethod
def test_hash():
spin1 = Spin(0.0, 0.0)
spin2 = Spin(1.5, -0.5)
assert {spin2, spin1, deepcopy(spin1),
deepcopy(spin2)} == {
spin1,
spin2,
}
@staticmethod
def test_neg():
isospin = Spin(1.5, -0.5)
flipped_spin = -isospin
assert flipped_spin.magnitude == isospin.magnitude
assert flipped_spin.projection == -isospin.projection
@pytest.mark.parametrize("spin", [Spin(2.5, -0.5), Spin(1, 0)])
def test_repr(self, spin):
from_repr = eval(repr(spin)) # pylint: disable=eval-used
assert from_repr == spin
@pytest.mark.parametrize(
"magnitude, projection",
[(0.3, 0.3), (1.0, 0.5), (0.5, 0.0), (-0.5, 0.5)],
)
def test_exceptions(self, magnitude, projection):
with pytest.raises(ValueError):
print(Spin(magnitude, projection))
def test_particle():
state = Particle(
"MyParticle",
pid=123,
mass=2.5,
width=0.3,
spin=1.5,
isospin=Spin(1.0, -1.0),
charge=-1,
)
converted_dict = io._xml.object_to_dict(state)
quantum_numbers = converted_dict["QuantumNumber"]
spin_dict = quantum_numbers[0]
charge_dict = quantum_numbers[1]
assert spin_dict["Value"] == 1.5
assert charge_dict["Value"] == -1
def build_spin(definition: Union[dict, float, int, str]) -> Spin:
def check_missing_projection(magnitude: float) -> None:
if magnitude != 0.0:
raise ValueError(
"Can only have a spin without projection if magnitude = 0")
if isinstance(definition, (float, int)):
magnitude = float(definition)
check_missing_projection(magnitude)
projection = 0.0
elif not isinstance(definition, dict):
raise ValueError(f"Cannot create Spin from definition {definition}")
else:
magnitude = float(definition["Value"])
if "Projection" not in definition:
check_missing_projection(magnitude)
projection = definition.get("Projection", 0.0)
return Spin(magnitude, projection)
def __create_two_body_decay_spin_data(
in_spin: Optional[Spin] = None,
out_spin1: Optional[Spin] = None,
out_spin2: Optional[Spin] = None,
angular_momentum: Optional[Spin] = None,
coupled_spin: Optional[Spin] = None,
) -> _SpinRuleInputType:
spin_zero = Spin(0, 0)
if in_spin is None:
in_spin = spin_zero
if out_spin1 is None:
out_spin1 = spin_zero
if out_spin2 is None:
out_spin2 = spin_zero
if angular_momentum is None:
angular_momentum = spin_zero
if coupled_spin is None:
coupled_spin = spin_zero
return (
[
SpinEdgeInput(
EdgeQuantumNumbers.spin_magnitude(in_spin.magnitude),
EdgeQuantumNumbers.spin_projection(in_spin.projection),
)
],
[
SpinEdgeInput(
EdgeQuantumNumbers.spin_magnitude(out_spin1.magnitude),
EdgeQuantumNumbers.spin_projection(out_spin1.projection),
),
SpinEdgeInput(
EdgeQuantumNumbers.spin_magnitude(out_spin2.magnitude),
EdgeQuantumNumbers.spin_projection(out_spin2.projection),
),
],
SpinNodeInput(
NodeQuantumNumbers.l_magnitude(angular_momentum.magnitude),
NodeQuantumNumbers.l_projection(angular_momentum.projection),
NodeQuantumNumbers.s_magnitude(coupled_spin.magnitude),
NodeQuantumNumbers.s_projection(coupled_spin.projection),
),
)
def test_exceptions(self, magnitude, projection):
with pytest.raises(ValueError):
print(Spin(magnitude, projection))
def build_spin(definition: dict) -> Spin:
magnitude = definition["Value"]
projection = definition.get("Projection", 0.0)
return Spin(magnitude, projection)
),
],
SpinNodeInput(
NodeQuantumNumbers.l_magnitude(angular_momentum.magnitude),
NodeQuantumNumbers.l_projection(angular_momentum.projection),
NodeQuantumNumbers.s_magnitude(coupled_spin.magnitude),
NodeQuantumNumbers.s_projection(coupled_spin.projection),
),
)
@pytest.mark.parametrize(
"rule_input, expected",
[(
__create_two_body_decay_spin_data(
angular_momentum=Spin(ang_mom_mag, 0)),
expected,
) for ang_mom_mag, expected in [
(0, True),
(1, False),
(2, False),
(3, False),
]] + [(
__create_two_body_decay_spin_data(in_spin=Spin(spin_mag, 0),
angular_momentum=Spin(spin_mag, 0)),
expected,
) for spin_mag, expected in zip([0, 1, 2], [True] * 3)] + [(
__create_two_body_decay_spin_data(
in_spin=Spin(spin_mag, 0),
out_spin1=Spin(1, -1),
out_spin2=Spin(1, 1),
def test_init_and_eq():
isospin = Spin(1.5, -0.5)
assert isospin == 1.5
assert float(isospin) == 1.5
assert isospin.magnitude == 1.5
assert isospin.projection == -0.5
def __create_isospin(pdg_particle: PdgDatabase) -> Optional[Spin]:
if pdg_particle.I is None:
return None
magnitude = pdg_particle.I
projection = __compute_isospin_projection(pdg_particle)
return Spin(magnitude, projection)
def wrapper( # pylint: disable=too-many-locals
self: Any, graph: StateTransitionGraph[ParticleWithSpin],
node_id: int) -> DecayNode:
amplitude = decay_generate_function(self, graph, node_id)
if isinstance(amplitude, HelicityDecay):
helicity_decay = amplitude
else:
raise TypeError(
f"Can only decorate with return value {HelicityDecay.__name__}"
)
node_props = graph.get_node_props(node_id)
ang_mom = __get_angular_momentum(node_props)
if ang_mom.projection != 0.0:
raise ValueError(f"Projection of L is non-zero!: {ang_mom}")
spin = __get_coupled_spin(node_props)
if not isinstance(spin, Spin):
raise ValueError(
f"{spin.__class__.__name__} is not of type {Spin.__name__}")
in_edge_ids = graph.get_edge_ids_ingoing_to_node(node_id)
parent_spin = Spin(
graph.get_edge_props(in_edge_ids[0])[0].spin,
graph.get_edge_props(in_edge_ids[0])[1],
)
daughter_spins: List[Spin] = []
for out_edge_id in graph.get_edge_ids_outgoing_from_node(node_id):
daughter_spin = Spin(
graph.get_edge_props(out_edge_id)[0].spin,
graph.get_edge_props(out_edge_id)[1],
)
if daughter_spin is not None and isinstance(daughter_spin, Spin):
daughter_spins.append(daughter_spin)
decay_particle_lambda = (daughter_spins[0].projection -
daughter_spins[1].projection)
cg_ls = ClebschGordan(
j_1=ang_mom.magnitude,
m_1=ang_mom.projection,
j_2=spin.magnitude,
m_2=decay_particle_lambda,
J=parent_spin.magnitude,
M=decay_particle_lambda,
)
cg_ss = ClebschGordan(
j_1=daughter_spins[0].magnitude,
m_1=daughter_spins[0].projection,
j_2=daughter_spins[1].magnitude,
m_2=-daughter_spins[1].projection,
J=spin.magnitude,
M=decay_particle_lambda,
)
return CanonicalDecay(
decaying_particle=helicity_decay.decaying_particle,
decay_products=helicity_decay.decay_products,
recoil_system=helicity_decay.recoil_system,
l_s=cg_ls,
s2s3=cg_ss,
)
def __get_coupled_spin(node_props: InteractionProperties) -> Spin:
s_mag = node_props.s_magnitude
s_proj = node_props.s_projection
if s_mag is None or s_proj is None:
raise TypeError("Coupled spin S not defined!")
return Spin(s_mag, s_proj)
def __get_angular_momentum(node_props: InteractionProperties) -> Spin:
l_mag = node_props.l_magnitude
l_proj = node_props.l_projection
if l_mag is None or l_proj is None:
raise TypeError("Angular momentum L not defined!")
return Spin(l_mag, l_proj)
isospin_conservation,
spin_conservation,
)
from .test_spin import __create_two_body_decay_spin_data
_SpinRuleInputType = Tuple[List[SpinEdgeInput], List[SpinEdgeInput],
SpinNodeInput]
@pytest.mark.parametrize(
"rule_input, expected",
[
(
__create_two_body_decay_spin_data(
Spin(1, 0),
Spin(1, 0),
Spin(1, 0),
Spin(1, 0),
Spin(0, 0),
),
True,
),
(
__create_two_body_decay_spin_data(
Spin(1, 0),
Spin(1, 0),
Spin(1, 0),
Spin(1, 0),
Spin(1, 0),
),
def test_neg():
isospin = Spin(1.5, -0.5)
flipped_spin = -isospin
assert flipped_spin.magnitude == isospin.magnitude
assert flipped_spin.projection == -isospin.projection
