OneLoop
OneLoop[q, amplitude]
calculates the 1-loop Feynman diagram amplitude. The argument q
denotes the integration variable, i.e., the loop momentum. OneLoop[name, q, amplitude]
has as first argument a name of the amplitude. If the second argument has head FeynAmp
then OneLoop[q, FeynAmp[name, k, expr]]
and OneLoop[FeynAmp[name, k, expr]]
tranform to OneLoop[name, k, expr]
. OneLoop
is deprecated, please use TID
instead!
See also
Overview, ToPaVe, ToPaVe2, A0, A00, B0, B1, B00, B11, C0, D0.
Examples
-I/Pi^2 FAD[{q, m}]
OneLoop[q, %]
−π2(q2−m2)i
A0(m2)
I ((el^2)/(16 Pi^4 (1 - D))) FAD[{q, mf}, {q - k, mf}] DiracTrace[(mf + GSD[q - k]) . GAD[\[Mu]] . (mf + GSD[q]) . GAD[\[Mu]]]
OneLoop[q, %]
16π4(1−D)(q2−mf2).((q−k)2−mf2)iel2tr((γ⋅(q−k)+mf).γμ.(mf+γ⋅q).γμ)
16π2el2(−1−D8mf2B0(k2,mf2,mf2)+1−D2(2−D)k2B0(k2,mf2,mf2)+1−D4DA0(mf2)−1−D8A0(mf2))