MadGraph5_aMC@NLO

High-pT Higgs +1j

Asked by Richard Ruiz

Dear Experts,

I am interested in studying the process g g > higgs + 1 j with pT^j > 500 GeV - 1 TeV, and h > w w* > l v j j. However, it is unclear to me which is the most appropriate procedure to doing this with MG5_amcatNLO.

1. My understanding is that the SM HEFT treatment (very efficient) breaks down for such large Higgs pT [1], which at this jet multiplicity is simply equal to pT^j and hence an issue.

[1] https://cp3.irmp.ucl.ac.be/projects/madgraph/wiki/Models/HiggsEffective

2. On the other hand, it is not obvious to me that using MadLoop and the commands
import model loop_sm-no_b_mass
define vv = ve vm vt ve~ vm~ vt~
define ee = e+ e-
generate g g > h j > ee vv j j j [QCD]

will generate the appropriate set of feynman diagrams. Indeed, the current MG5 release yelled at me and threw "NoDiagramException".

3. A third option is to use MadSpin + MadLoop. So, generate first
import model loop_sm-no_b_mass
generate g g > h j [QCD]

then during event generation decay the high-pT higgs to ww*. However, this now begs the question of how to do three- and four-body decays with MadSpin. It is my understanding that only 1 -> 2 processes are supported.

Suggestions and recommendations on the most appropriate procedure would be greatly appreciated.

Best,
Richard

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Olivier Mattelaer (olivier-mattelaer) said : 		#1

The third option is the correct one.
More info are in arXiv:1507.00020

Cheers,

Olivier
> On Mar 3, 2016, at 11:47, Richard Ruiz <email address hidden> wrote:
>
> New question #287622 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/287622
>
> Dear Experts,
>
> I am interested in studying the process g g > higgs + 1 j with pT^j > 500 GeV - 1 TeV, and h > w w* > l v j j. However, it is unclear to me which is the most appropriate procedure to doing this with MG5_amcatNLO.
>
> 1. My understanding is that the SM HEFT treatment (very efficient) breaks down for such large Higgs pT [1], which at this jet multiplicity is simply equal to pT^j and hence an issue.
>
> [1] https://cp3.irmp.ucl.ac.be/projects/madgraph/wiki/Models/HiggsEffective
>
> 2. On the other hand, it is not obvious to me that using MadLoop and the commands
> import model loop_sm-no_b_mass
> define vv = ve vm vt ve~ vm~ vt~
> define ee = e+ e-
> generate g g > h j > ee vv j j j [QCD]
>
> will generate the appropriate set of feynman diagrams. Indeed, the current MG5 release yelled at me and threw "NoDiagramException".
>
> 3. A third option is to use MadSpin + MadLoop. So, generate first
> import model loop_sm-no_b_mass
> generate g g > h j [QCD]
>
> then during event generation decay the high-pT higgs to ww*.
>
>
> Suggestions and recommendations on the most appropriate procedure would be greatly appreciated.
>
>
> Best,
> Richard
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

Revision history for this message
Richard Ruiz (rruiz) said : 		#2

Thanks for the quick answer, Olivier!

best,
Richard