Name: Vladyslav Shtabovenko (email_not_shown)
Date: 06/09/17-10:11:31 AM Z


To be precise, it is a regression caused by myself being not careful
enough while refactoring the source code of TARCER.

On the other hand, it was a good opportunity to clean up TARCER.m so
that now it is much more readable (the original TARCER.m was converted
from TARCER.nb and it was hardly human readable).

Anyway, now it is fixed

<https://github.com/FeynCalc/feyncalc/commit/bb27fe833aa5c0c55cafcb5cd75673ccdd295787>

thanks for your bug report and please reinstall FeynCalc.

Cheers,
Vladyslav

Am 27.05.2017 um 00:21 schrieb Rolf Mertig:
> but not a bug in Tarcer ...
>
> If I download TARCER 2.0.nb from the repository, run it (on Windows 10,
> Mathematica 11.1.1) and then run
> TarcerRecurse[eg2[1]]
> I get
> -((-2 + d)^2*(3776 - 4902*d + 2175*d^2 - 404*d^3 +
> 27*d^4)*\[CapitalDelta]p*TAI[d, 0, {{1, M}}]^2)/(256*(-5 + d)^2*(-4 +
> d)^2*(-3 + d)*M^8) - ((-2 + d)*(-10 + 3*d)*(-8 +
> 3*d)*\[CapitalDelta]p*TJI[d, M^2, {{1, M}, {1, 0}, {1, 0}}])/(32*(-5 +
> d)*(-4 + d)*(-7 + 2*d)*M^6) +
> (d*(-10 + 3*d)*(-8 + 3*d)*\[CapitalDelta]p*TJI[d, M^2, {{1, M}, {1,
> M}, {1, M}}])/(128*(-4 + d)^2*M^6)
>
> See attached notebooks.
>
> Rolf
>
> On 5/26/2017 11:03 PM, Vladyslav Shtabovenko wrote:
>> Hi,
>>
>> it is a bug, but I'm afraid that it will take me some time to fix it:
>> The source code of TARCER is very poorly documented and I have
>> my PhD defense next week.
>>
>> This particular case uses special notation
>>
>> TFI[d, pp, dp, {a,b}, {{n1,m1},{n2,m2},{n3,m3},{n4,m4},{n5,m5}}]
>>
>> for including numerators with OPEDelta's, so it's more Rolf's expertise.
>>
>> Anyhow, I'll look at it end of next week.
>>
>>
>> Cheers,
>> Vladyslav
>>
>>
>> Am 26.05.2017 um 16:52 schrieb zhang:
>>> Hi, all,
>>>
>>> When I run the examples notebook for Tarcer in
>>> FeynCalc 9.1.0 and FeynCalc 9.2.0.
>>>
>>> In[3]:= eg2[m_] := TFI[d, M^2, \[CapitalDelta]p, {m, 0},
>>> {{2, M}, 1, 1, {1, M},
>>> {1, M}}]
>>>
>>> In[4]:= TarcerRecurse[eg2[1]]
>>>
>>> Out[4]= -(((d-2)^2 (27 d^4-404 d^3+2175 d^2-4902 d+3776)
>>> Tarcer`Private`dp (Subsuperscript[A, {1,M}, (d)])^2)/
>>> (256 (d-5)^2 (d-4)^2 (d-3) M^8))-((d-2) (3 d-10) (3 d-8)
>>> Tarcer`Private`dp Subsuperscript[J, {1,M}{1,0}{1,0}, (d)])
>>> /(32 (d-5) (d-4) (2 d-7) M^6)+(d (3 d-10) (3 d-8)
>>> Tarcer`Private`dp Subsuperscript[J, {1,M}{1,M}{1,M}, (d)])
>>> /(128 (d-4)^2 M^6)
>>>
>>> An internal parameter Tarcer`Private`dp shows up in the final
>>> expression rather than the expected \[CapitalDelta]p.
>>> Is this a bug?
>>>
>>>
>>> Thanks!
>>>
>>> Zhang
>>>
>>
>>
>



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