Higgs production cross-section: process pp > h

Asked by Maksym Ovchynnikov on 2019-04-24

When launching the the process

p p > h [noborn = QCD]

within the sm model and with run_card.dat generated by default I obtained the cross section 15.4 pb, which is 2 pb smaller than in https://arxiv.org/abs/1507.00020 . What can be a reason for this?

Question information

Language:
English Edit question
Status:
Answered
For:
MadGraph5_aMC@NLO Edit question
Assignee:
No assignee Edit question
Last query:
2019-04-24
Last reply:
2019-04-25

I would be on the pdf set used within that paper which is not the default pdf set.

Cheers,

Olivier

> On 24 Apr 2019, at 22:17, Maksym Ovchynnikov <email address hidden> wrote:
>
> New question #680425 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/680425
>
> When launching the the process
>
> p p > h [noborn = QCD]
>
> within the sm model and run_card.dat generated by default I obtained the cross section 15.4 pb, which is 2 pb smaller than in https://arxiv.org/abs/1507.00020 . What can be a reason for this?
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

Maksym Ovchynnikov (name-xxx) said : #2

I installed the PDF set mentioned in the paper (MSTW2008lo68cl_nf4) within the LHAPDF, but the answer has changed only slightly - up to 15.7 pb.

Maksym Ovchynnikov (name-xxx) said : #3

Sorry, the last comment is not relevant yet.

Note also the dynamical scale choice that is choosen for the paper.

With the systamics module, you can see that it has a 20% impact on the cross-section

#***************************************************************************
#
# original cross-section: 15.6882939824
# scale variation: +26.5% -20.5%
# central scheme variation: +20% -1.59e-10%
# PDF variation: +2.46% -2.46%
#
# dynamical scheme # 1 : nan # \sum ET
# dynamical scheme # 2 : 15.6883 +26.5% -20.5% # \sum\sqrt{m^2+pt^2}
# dynamical scheme # 3 : 18.8298 +33.3% -24.8% # 0.5 \sum\sqrt{m^2+pt^2}
# dynamical scheme # 4 : 15.6883 +26.5% -20.5% # \sqrt{\hat s}
#***************************************************************************

Cheers,

Olivier

Maksym Ovchynnikov (name-xxx) said : #5

Dear Olivier,

am I right that the scale chosen in the paper is not implemented in MadGraph?

Did you look at Table 13 of the paper?
It explains how to do it.

Cheers,

Olivier

> On 25 Apr 2019, at 00:57, Maksym Ovchynnikov <email address hidden> wrote:
>
> Question #680425 on MadGraph5_aMC@NLO changed:
> https://answers.launchpad.net/mg5amcnlo/+question/680425
>
> Status: Answered => Open
>
> Maksym Ovchynnikov is still having a problem:
> Dear Olivier,
>
> am I right that the scale chosen in the paper is not implemented in
> MadGraph?
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

Can you help with this problem?

Provide an answer of your own, or ask Maksym Ovchynnikov for more information if necessary.

To post a message you must log in.