Hello,
i tried to verify the coeffC8sm = 0.16443888E10 (real part) at Q = 160 GeV taken from the SPheno output with the formula given in hepph/9805303v2 Eq. 10 on page 5,
but what i got was C8 = 0.0964357.
Then i normalized my C8 with n_cq^1 = 8.87289*10^9 as stated in arxiv:1405.1434 and got C8norm = 8.55663*10^10.
Could you tell me what kind of normalization i should use to get the appropriate value?
Calculation of Wilson Coefficients in SPheno
Re: Calculation of Wilson Coefficients in SPheno
Hi,
the normalisation was chosen to be in agreement with the conventions of flavio. I would need to check what the exact factor is, but I'm still on parental leave. I hope that checking the flavio documentation is of some help for you.
Best,
Florian
the normalisation was chosen to be in agreement with the conventions of flavio. I would need to check what the exact factor is, but I'm still on parental leave. I hope that checking the flavio documentation is of some help for you.
Best,
Florian
Re: Calculation of Wilson Coefficients in SPheno
If this is not solved earlier, I will have a look next week.
In the meantime, perhaps it would be useful to point out that the most recent version of SARAH/SPheno produces output for the Wilson coefficients in WCxf format (see 1712.05298 and https://wcxf.github.io/). This format was recently defined to avoid confusions regarding normalization (and other conventions) and to allow for an easier exchange of I/O files between different flavor codes). In this case the normalization of the operator you are interested about was unambiguously fixed when defining the FlavorKit basis (https://wcxf.github.io/assets/pdf/WET.FlavorKit.pdf).
In the meantime, perhaps it would be useful to point out that the most recent version of SARAH/SPheno produces output for the Wilson coefficients in WCxf format (see 1712.05298 and https://wcxf.github.io/). This format was recently defined to avoid confusions regarding normalization (and other conventions) and to allow for an easier exchange of I/O files between different flavor codes). In this case the normalization of the operator you are interested about was unambiguously fixed when defining the FlavorKit basis (https://wcxf.github.io/assets/pdf/WET.FlavorKit.pdf).

 Posts: 3
 Joined: 10. Jan 2018, 14:53
Re: Calculation of Wilson Coefficients in SPheno
Hi,
@Staub
it seems like flavio and the paper i referred to use the same basis. Is it possible to output the Wilson Coefficients of flavio?
On a different note: i was able to confirm coeffC7sm using the steps i mentioned in the first post.
@Avelino
The json files from SPheno/FlavorKit contain only the chirality flipped coeffC7p and coeffC8p as Q1R_32 and Q2R_32?
This was testet with SARAH4.12.3 and SPheno4.0.3 and the THDMII.
Best regards,
SoundSonic1
@Staub
it seems like flavio and the paper i referred to use the same basis. Is it possible to output the Wilson Coefficients of flavio?
On a different note: i was able to confirm coeffC7sm using the steps i mentioned in the first post.
@Avelino
The json files from SPheno/FlavorKit contain only the chirality flipped coeffC7p and coeffC8p as Q1R_32 and Q2R_32?
This was testet with SARAH4.12.3 and SPheno4.0.3 and the THDMII.
Best regards,
SoundSonic1
Re: Calculation of Wilson Coefficients in SPheno
SoundSonic1 wrote:Hi,
The json files from SPheno/FlavorKit contain only the chirality flipped coeffC7p and coeffC8p as Q1R_32 and Q2R_32?
You also have the operators obtained by exchanging the flavor indices: Q1R_23 and Q2R_23. With those you should be able to get the coefficients you are interested in.

 Posts: 3
 Joined: 10. Jan 2018, 14:53
Re: Calculation of Wilson Coefficients in SPheno
Hi Avelino,
they are zero :/
You can have a look at my files:
https://pastebin.com/PTZk2ATv SPheno.spc.THDMII
https://pastebin.com/DFurKQeH WC.THDMII_1.json
they are zero :/
You can have a look at my files:
https://pastebin.com/PTZk2ATv SPheno.spc.THDMII
https://pastebin.com/DFurKQeH WC.THDMII_1.json
Who is online
Users browsing this forum: No registered users and 1 guest