Numerical problem for the SM Wilson coefficient of the process b->c \tau\nu

[Dris]

Dear Florian,
In the Flavorkit convention the SM Wilson coefficient at tree level is given by

C_SM= - g2^2*ZEL(3,3)*ZDL(3,j1)*ZUL(2,j1)/(2*mW^2)
~ g2^2* ZEL(3,3)*ZDL(3,3)*ZUL(2,3)/(2*mW^2)
the inputs are
g2=0.65 , ZEL(3,3)=1 , ZDL(3,3)=0.999 , ZUL(2,3) = 0.042

we should get C_SM=-1.37461*10^-6, but the output is -2.88944926*10^-6.

The inputs of PreSARAH and Flavorkit are attache.

Best.

[FStaub]

Hi,

here is a beta-version https://flstaub.web.cern.ch/flstaub/SAR ... 2b2.tar.gz with different normalisation.

Cheers,
Florian

[Dris]

Thanks a lot.

Dris.