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SIREN compatibility changes #39

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SIREN compatibility changes #39

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14 changes: 8 additions & 6 deletions src/DarkNews/integrands.py
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Original file line number Diff line number Diff line change
Expand Up @@ -675,7 +675,7 @@ def get_momenta_from_vegas_samples(vsamples, MC_case):
return four_momenta


def get_decay_momenta_from_vegas_samples(vsamples, decay_case, PN_LAB):
def get_decay_momenta_from_vegas_samples(vsamples, decay_case, PN_LAB, rng=None):
"""
Construct the four momenta of all final state particles in the decay process from the
vegas weights.
Expand All @@ -684,10 +684,12 @@ def get_decay_momenta_from_vegas_samples(vsamples, decay_case, PN_LAB):
vsamples (np.ndarray): integration samples obtained from vegas
as hypercube coordinates. Always in the interval [0,1].

MC_case (DarkNews.process.dec_case): the decay class of DarkNews
decay_case (DarkNews.process.dec_case): the decay class of DarkNews

PN_LAB (np.ndarray): four-momentum of the upscattered N in the lab frame: [E, pX, pY, pZ]

rng: random number generating function that can be passed to phase_space function calls

Returns:
dict: each key corresponds to a set of four momenta for a given particle involved,
so the values are 2D np.ndarrays with each row a different event and each column a different
Expand Down Expand Up @@ -732,7 +734,7 @@ def get_decay_momenta_from_vegas_samples(vsamples, decay_case, PN_LAB):
"m3": m_mediator, # Z'
}
# Phnl, Phnl_daughter, Pz'
P1LAB_decay, P2LAB_decay, P3LAB_decay = phase_space.two_body_decay(N_decay_samples, boost=boost_scattered_N, **masses_decay, rng=MC_case.rng)
P1LAB_decay, P2LAB_decay, P3LAB_decay = phase_space.two_body_decay(N_decay_samples, boost=boost_scattered_N, **masses_decay)

# Z' boost parameters
boost_Z = {
Expand All @@ -751,7 +753,7 @@ def get_decay_momenta_from_vegas_samples(vsamples, decay_case, PN_LAB):
"m3": mm, # \ell-
}
# PZ', pe-, pe+
P1LAB_decayZ, P2LAB_decayZ, P3LAB_decayZ = phase_space.two_body_decay(Z_decay_samples, boost=boost_Z, **masses_decay, rng=MC_case.rng)
P1LAB_decayZ, P2LAB_decayZ, P3LAB_decayZ = phase_space.two_body_decay(Z_decay_samples, boost=boost_Z, **masses_decay)

four_momenta["P_decay_N_parent"] = P1LAB_decay
four_momenta["P_decay_N_daughter"] = P2LAB_decay
Expand Down Expand Up @@ -782,7 +784,7 @@ def get_decay_momenta_from_vegas_samples(vsamples, decay_case, PN_LAB):
P2LAB_decay,
P3LAB_decay,
P4LAB_decay,
) = phase_space.three_body_decay(N_decay_samples, boost=boost_scattered_N, **masses_decay, rng=MC_case.rng)
) = phase_space.three_body_decay(N_decay_samples, boost=boost_scattered_N, **masses_decay)

four_momenta["P_decay_N_parent"] = P1LAB_decay
four_momenta["P_decay_ell_minus"] = P2LAB_decay
Expand All @@ -804,7 +806,7 @@ def get_decay_momenta_from_vegas_samples(vsamples, decay_case, PN_LAB):
"m3": 0.0, # gamma
}
# Phnl, Phnl', Pgamma
P1LAB_decay, P2LAB_decay, P3LAB_decay = phase_space.two_body_decay(N_decay_samples, boost=boost_scattered_N, **masses_decay, rng=MC_case.rng)
P1LAB_decay, P2LAB_decay, P3LAB_decay = phase_space.two_body_decay(N_decay_samples, boost=boost_scattered_N, **masses_decay)

four_momenta["P_decay_N_parent"] = P1LAB_decay
four_momenta["P_decay_N_daughter"] = P2LAB_decay
Expand Down
4 changes: 2 additions & 2 deletions src/DarkNews/processes.py
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Original file line number Diff line number Diff line change
Expand Up @@ -279,12 +279,12 @@ def __init__(self, nu_parent, nu_daughter, final_lepton1, final_lepton2, TheoryM

## Is the mediator on shell?
self.vector_on_shell = (
(TheoryModel.mzprime is not None) and (self.m_parent - self.m_daughter > TheoryModel.mzprime) and (TheoryModel.mzprime > self.mm + self.mp)
(TheoryModel.mzprime is not None) and (self.m_parent - self.m_daughter > TheoryModel.mzprime) and (TheoryModel.mzprime > self.mm + self.mp) and (self.Dih>0)
)
self.vector_off_shell = not self.vector_on_shell

self.scalar_on_shell = (
(TheoryModel.mhprime is not None) and (self.m_parent - self.m_daughter > TheoryModel.mhprime) and (TheoryModel.mhprime > self.mm + self.mp)
(TheoryModel.mhprime is not None) and (self.m_parent - self.m_daughter > TheoryModel.mhprime) and (TheoryModel.mhprime > self.mm + self.mp) and (self.Sih>0)
)
self.scalar_off_shell = not self.scalar_on_shell

Expand Down
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