**Next message:**Jongping Hsu: "qcd beta function?,etc"**Previous message:**Vladyslav Shtabovenko: "FeynHelpers 1.0 released"**Next in thread:**Vladyslav Shtabovenko: "Re: OneLoop calculation from FeynCalc on Mathematica 11"**Reply:**Vladyslav Shtabovenko: "Re: OneLoop calculation from FeynCalc on Mathematica 11"**Messages sorted by:**[ date ] [ thread ] [ subject ] [ author ]**Mail actions:**[ respond to this message ] [ mail a new topic ]

Dear Frederik,

I used to use Feyncalc 8.2.0 on Mathematica 9, and recently I started to

use Feyncalc 9.2.0 on Mathematica 11. However, I encountered a problem in

doing the one loop integral,

SP[p,p]=m^2;(*kinematics*)

SetOptions[B0, BReduce->True, B0Unique->True, B0Real->True];

OneLoop[k, FVD[k, \[Alpha]].GSD[k] FAD[{k, m}, p - k]];

In the old version, I have

I \[Pi]^2 (m^2 DiracGamma[LorentzIndex[\[Alpha]]]+8 DiracGamma[Momentum[p]]

Pair[LorentzIndex[\[Alpha]],

Momentum[p]] )/9 + (

I \[Pi]^2 A0[m^2] (m^2 DiracGamma[LorentzIndex[\[Alpha]]] +

2 DiracGamma[Momentum[p]] Pair[LorentzIndex[\[Alpha]],

Momentum[p]]))/(6 m^2)

but, in the new version, I have

2 I \[Pi]^2 DiracGamma[Momentum[p]] Pair[LorentzIndex[\[Alpha]],

Momentum[p]] + (

I \[Pi]^2 A0[m^2] (m^2 DiracGamma[LorentzIndex[\[Alpha]]] +

2 DiracGamma[Momentum[p]] Pair[LorentzIndex[\[Alpha]],

Momentum[p]]))/(6 m^2)

Comparing the two results, I find that the second terms which include the

UV divergence terms are same, but the first finite terms are different. In

fact the result from the old version is the correct one. Can you help me to

resolve this problem?

Best regards,

Jong-Wan

**Next message:**Jongping Hsu: "qcd beta function?,etc"**Previous message:**Vladyslav Shtabovenko: "FeynHelpers 1.0 released"**Next in thread:**Vladyslav Shtabovenko: "Re: OneLoop calculation from FeynCalc on Mathematica 11"**Reply:**Vladyslav Shtabovenko: "Re: OneLoop calculation from FeynCalc on Mathematica 11"**Messages sorted by:**[ date ] [ thread ] [ subject ] [ author ]**Mail actions:**[ respond to this message ] [ mail a new topic ]

*
This archive was generated by hypermail 2b29
: 10/19/17-10:40:02 AM Z CEST
*