Running fixed order with UFO models?

HI,

This has nothing to do with the model.
The difference is that in one case you generate a NLO process (for your SM) and that for this case you generate a LO process.

For LO process, they are no difference (at matrix-element level) between fix order and LO+PS.
Having pythia off is therefore a fix order run.

Cheers,

Olivier

> On Oct 19, 2015, at 16:57, sgreydan <email address hidden> wrote:
>
> New question #272606 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/272606
>
> Hi,
>
> Quick question - is it possible to do a fixed-order run using a UFO model which is different from the (default) SM model in MadGraph? I'm trying to do a fixed order run using the Higgs Characterization (HC) model (http://feynrules.irmp.ucl.ac.be/wiki/HiggsCharacterisation)
>
> The options it's giving me are:
>
> The following switches determine which programs are run:
> 1 Run the pythia shower/hadronization: pythia=NOT INSTALLED
> 2 Run PGS as detector simulator: pgs=NOT INSTALLED
> 3 Run Delphes as detector simulator: delphes=NOT INSTALLED
> 4 Decay particles with the MadSpin module: madspin=OFF
> 5 Add weights to the events based on changing model parameters: reweight=OFF
> Either type the switch number (1 to 5) to change its default setting,
> or set any switch explicitly (e.g. type 'madspin=ON' at the prompt)
> Type '0', 'auto', 'done' or just press enter when you are done.
> [0, 4, 5, auto, done, madspin=ON, madspin=OFF, madspin, reweight=ON, ... ][60s to answer]
>
> In the SM model, there is a fixed order option, but it is missing here as far as I know.
>
> Best!
>
> Sam
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

I should have clarified: I'm using the NLO HC model

That does not change anything to my answer.
You can generate LO matrix element with NLO model.

Cheers,

Olivier

> On Oct 19, 2015, at 17:17, sgreydan <email address hidden> wrote:
>
> Question #272606 on MadGraph5_aMC@NLO changed:
> https://answers.launchpad.net/mg5amcnlo/+question/272606
>
> Status: Answered => Open
>
> sgreydan is still having a problem:
> I should have clarified: I'm using the NLO HC model
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.