Belle II Software
release-06-00-14
propagators.py
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# This file was automatically created by FeynRules 2.0 (static file)
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# Mathematica version: 8.0 for Mac OS X x86 (64-bit) (November 6, 2010)
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# Date: Mon 1 Oct 2012 14:58:26
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from
object_library
import
all_propagators, Propagator
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# define only once the denominator since this is always the same
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denominator =
"P('mu', id) * P('mu', id) - Mass(id) * Mass(id) + complex(0,1) * Mass(id) * Width(id)"
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# propagator for the scalar
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S = Propagator(name=
"S"
,
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numerator=
"complex(0,1)"
,
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denominator=denominator
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)
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# propagator for the incoming fermion # the one for the outcomming is computed on the flight
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F = Propagator(name=
"F"
,
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numerator=
"complex(0,1) * (Gamma('mu', 1, 2) * P('mu', id) + Mass(id) * Identity(1, 2))"
,
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denominator=denominator
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)
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# massive vector in the unitary gauge, can't be use for massless particles
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V1 = Propagator(name=
"V1"
,
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numerator=
"complex(0,1) * (-1 * Metric(1, 2) + Metric(1,'mu')* P('mu', id) * P(2, id) / Mass(id)**2 "
,
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denominator=denominator
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)
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# massless vector and massive vector in unitary gauge
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V2 = Propagator(name=
"V2"
,
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numerator=
"complex(0,-1) * Metric(1, 2)"
,
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denominator=
"P('mu', id) * P('mu', id)"
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)
generators
madgraph
models
Lmu_minus_Ltau_UFO
propagators.py
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