MadGraph5_aMC@NLO

About two higgs doublet model and madspin for decay

Asked by aravind

I am generating the following events:

import model 2HDM
define chig = h+ h-
define top = t t~
define bot = b b~
generate g bot > h+ top , ( h+ > top bot )
add process g bot > h- top , ( h- > top bot )
output outdir

edit ./outdir/Cards/param_card.dat with some changes and run bin/generate_events with switching madspin decay on.
I get the error:

INFO: detected model: 2HDM. Loading...
Command "generate_events " interrupted with error:
Exception : invalid particle name: ( h+.
Please report this bug on https://bugs.launchpad.net/mg5amcnlo
More information is found in '/home/SlowData/everything/ChargedHiggs/ChargedHiggsNew/Madgraph/gb2th/300/run_01_tag_1_debug.log'.
Please attach this file to your report.

I donot know if this is really a bug, is there something wrong that I am doing ?
Basically, I want to generate Charged Higgs events and force the higgs to decay to t b and then let the normal standard model decays take over.

Thank you.

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Olivier Mattelaer (olivier-mattelaer) said : 		#1

Hi,

You need to do the charged Higgs decay inside MadSpin.
The full decay chain should either be done by MadSpin or by the decay chain syntax.
In this case, it does not make that much sense to mix the two.

Cheers,

Olivier
On 24 Aug 2017, at 10:47, aravind <<email address hidden><mailto:<email address hidden>>> wrote:

import model 2HDM
define chig = h+ h-
define top = t t~
define bot = b b~
generate g bot > h+ top , ( h+ > top bot )
add process g bot > h- top , ( h- > top bot )
output outdir

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