Question on polarization dependence on Weinberg angle?

Hi,

If you use the MadSpin package (arXiv:1212.3460) which is the new implementation of the method in the paper that you quote (hep-ph/0702198v1) then the decay is done at pure Leading-order accuracy.

Cheers,

Olivier

On 20 Mar 2015, at 21:56, Ian Nugent <email address hidden> wrote:

> New question #263915 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/263915
>
> Hello,
> I am trying to find out to what order the polarization for Z->tautau is implemented in madgraph. In particular to what order is the dependence on the Weinberg angle? From arXiv:hep-ph/0702198v1 (from this list of papers on your web-site) eq 2.2 and 2.3 the dependence appear to be only leading order and does not include higher order corrections that cause the FB asymmetry. Could you please clarify if this is the case or if the polarization dependencies are included to higher order in Madgraph? Thank you and best regards,
> Ian
>
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

Hi Oliver,
   Ok, the paper I was looking at refers to MadSpin. Am I correct to assume for your response that Madgraph 5 (or any other version) does not provide higher order corrections either. Thank you and best regards,
Ian

Hi,

if you directly make your decay inside MG5_aMC@NLO via for example:
generate p p > ta+ ta- [QCD]
Then you have to full computation at NLO in QCD with the full matrix-element and therefore all the correlation.

Now you are probably more interested in the NLO in Electroweak that we are not yet able to handle.

Cheers,

Olivier

On 20 Mar 2015, at 22:51, Ian Nugent <email address hidden> wrote:

> Question #263915 on MadGraph5_aMC@NLO changed:
> https://answers.launchpad.net/mg5amcnlo/+question/263915
>
> Status: Answered => Open
>
> Ian Nugent is still having a problem:
> Hi Oliver,
> Ok, the paper I was looking at refers to MadSpin. Am I correct to assume for your response that Madgraph 5 (or any other version) does not provide higher order corrections either. Thank you and best regards,
> Ian
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

Thank you Oliver,
  This answer my question, you are not including NLO for the Electroweak corrections. Thank you and best regards,
Ian