mu to e conversion calculation in FlavorKit

[WojciechKotlarski]

Hi Florian,

We're currently trying to reproduce a result from literature for the mu to e conversion using FlavorKit. Unfortunately, without success. Therefore we started looking inside the code to pin point the difference. Would be great if you could clarify some points about the internals of Flavorkit for me. One thing that surprises me is the difference in the definition of the PhotonQQp and PhotonLLp form factors in your paper arXiv:1405.1434. If you compare Listings 1 and 5, the left and right projectors are swapped while the operators seem conceptually identical. The second thing, which I don't know if it's related to the previous one, is that if I do diff on the Gamma2l.m between the oldest version of SARAH available for download (i.e. 4.5.8) and the nevest one then I see that at some point the order of fermions changed from

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NamesParticles =  {bar[ChargedLepton], ChargedLepton, Photon};

to

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NamesParticles =  {ChargedLepton, bar[ChargedLepton], Photon};

Is this maybe related to a similar change reported not long ago for the PhotonQQp operator?

cheers,
Wojciech

[FStaub]

Hi,

I have uploaded this morning v4.13.0 where I went back to the old Version of GluonQQp and PhotonLLp.

Cheers,
Florian

[WojciechKotlarski]

Hi,

There doesn't seem to be any difference between v4.12.3 and 4.13.0 in that respect. Both files say

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(* Created at 10:12 on 5.10.2016 *) 

cheers,
Wojciech

[FStaub]

Hi,

could you please try again. Seems that this was a svn problem.

Cheers,
Florian