How should I generate hj +hjj QED<=2 [QCD]

Hi,

Should not you ask for
> add process p p > h j j QED<=1 [QCD] @1

asking for QED<=2 allows for VBF process which are not include in normal matching/merging.
Therefore you have a born process, and that process will be a standard NLO computation and not a loop induced computation.

Cheers,

Olivier

PS: This is how we did such generation for the following paper: https://arxiv.org/pdf/1507.00020.pdf

> On 17 Apr 2020, at 16:47, Chung, Yi-Lun <email address hidden> wrote:
>
> New question #690018 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/690018
>
> Hello,
>
> My goal is to generate ggH plus jets(up to 2 jets),
> This is my syntax:
>
> import model loop_sm
> generate p p > h j [QCD] @0
> add process p p > h j j QED<=2 [QCD] @1
>
> In version 2.7.2, I got this error message:
> Command "add process p p > h j j QED<=2 [QCD] @1" interrupted with error:
> InvalidCmd : Command not compatible with previous command: Can not combine LO/NLO feature.
>
> In version 2.6.4,
> I can run this syntax successfully.
>
> Is it possible run this syntax in version 2.7.2?
>
> Looking forward for reply.
> Thanks.
>
>
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

Hi Olivier

Thanks for your quick reply.

I still get the error message:

Command "add process p p > h j j QED<=1 [QCD] @1" interrupted with error:
InvalidCmd : Command not compatible with previous command: Can not combine LO/NLO feature.

Is asking QED<=3 for VBF H process?

Thanks.

Best,
Yi-Lun

HI,

Here is a link to the page that fixes the issue:
https://bazaar.launchpad.net/~mg5core1/mg5amcnlo/2.7.3/revision/299

You will find there the patch and a link to a download for that particular build

Cheers,

Olivier

Hi,

Thanks for your help.

The issue still remains.
Here is error message for MG5_debug.

import model loop_sm
generate p p > h j [QCD]@0
add process p p > h j j QED<=1 [QCD]@1
Traceback (most recent call last):
  File "/home/alan/programs/2.7.3/madgraph/interface/extended_cmd.py", line 1515, in onecmd
    return self.onecmd_orig(line, **opt)
  File "/home/alan/programs/2.7.3/madgraph/interface/extended_cmd.py", line 1464, in onecmd_orig
    return func(arg, **opt)
  File "/home/alan/programs/2.7.3/madgraph/interface/master_interface.py", line 214, in do_add
    self.change_principal_cmd('aMC@NLO', allow_switch)
  File "/home/alan/programs/2.7.3/madgraph/interface/master_interface.py", line 624, in change_principal_cmd
    raise InvalidCmd, "Command not compatible with previous command: Can not combine LO/NLO feature."
InvalidCmd: Command not compatible with previous command: Can not combine LO/NLO feature.

Best,
Yi-Lun

It works. Thank you very much.

Cheers,
Yi-Lun

Thanks Olivier Mattelaer, that solved my question.