MadGraph5_aMC@NLO

SMEFTsim restricting orders and decay chain

Asked by barthoux maxime

Hello,

I'm trying to generate according to : generate p p > t t~ NP<=1, (t > b W+, W+ > l+ vl), (t~ > b~ W-, W- > l- vl~).

However, when trying to specify some couplings, I end up with the "Decay processes cannot specify squared order constraints".

I have seen in various posts that it wasn't working currently when proceeding this way.

So my question is the following : Is there any way to work around this issue in my specific case ?

Thanks,
Maxime

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Olivier Mattelaer (olivier-mattelaer) said : 		#1

Hi,

This command:
generate p p > t t~ NP<=1, (t > b W+, W+ > l+ vl), (t~ > b~ W-, W- > l- vl~)

does not apply restriction at the amplitude square level and therefore should work:
I have tested our LTS version and this is indeed the case.
and I also tested with our alpha release of 3.6.0 and this is also the case.

So I'm confused... and can not really comment on this.

Olivier

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barthoux maxime (maximebarthoux) said : 		#2

Sorry for the mistake and thank you for your answer,

The command I wrote in my previous message is the one working correctly.

generate p p > t t~ NP<=1 NP^2==1, (t > b W+, W+ > l+ vl), (t~ > b~ W-, W- > l- vl~) is the command giving me an error.

Maxime

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Olivier Mattelaer (olivier-mattelaer) said : 		#3

we (=collaboration with ATLAS) are working on a work-around for such case via madspin (so basically a new version of madspin) but we are not yet able to handle multiple decay and not yet have remove all the security put in place to prevent such type of syntax.

So in the next couple of months it should be fixed but right now I do not have real work around for such case

Cheers,

Olivier

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