Adding off-shell contribution Scalar Higgs model

[Mattia Di Mauro]

I am trying to calculate the contribution to the cross section from the 2 --> 3 annihilation processes via an off-shell W or Z-boson, DMDM --> WW* and ZZ*.
I am doing this for the ScalarHiggsPortal model.
Following the suggestion from this paper of MadDM https://arxiv.org/abs/1804.00044, I am trying to get this by doing:

###############
python2.7 bin/maddm.py
MadDM > import model ScalarHiggsPortal_NLO_UFO
MadDM > define darkmatter n1
MadDM > generate relic_density
MadDM > define ferm = ve vm vt ve~ vm~ vt~ u c t d s b u~ c~ t~ d~ s~ b~ e- mu- ta- e+ mu+ ta+
MadDM > define wz = w+ w- z
MadDM > add indirect_detection wz ferm ferm
MadDM > output test
MadDM > launch test
###############

The diagrams indeed contain the off-shell production of Z* and W*.
However, during the calculation of the sigmav, I obtain this error:

###############
INFO: generating the square matrix element for reweighting
INFO: generate n1 n1 > w+ b t~ ..... ;add process n1 n1 > w- c s~ SIEFFV=0 SIEFFS=0 SIEFFF=0 SDEFFV=0 SDEFFF=0 ;
INFO: Done 5.209
WARNING: REWEIGHTING: original card and new card are identical.
INFO: starts to compute weight for events with the following modification to the param_card:
INFO:
INFO: Event nb 0 current time: 13h42
.........
INFO: Event nb 9000 8.7s
INFO: All event done (nb_event: 10000) 9.7s
INFO: Eventfiles is/are now created with new central weight
INFO: new cross-section is : 3.76501e+07 pb (indicative error: 124739 pb)
INFO: Original cross-section: 37649450.0 +- 120937.7 pb (cross-section from sum of weights: 37649453.0)
INFO: Computed cross-section:
INFO: rwgt_1 : 37650051.4121 +- 124738.969479 pb
quit
Command "launch test" interrupted with error:
KeyError : 'n1n1_wpvltam'
###############

I send in attachment the zip of the Card folder with also the Debug file.

A similar error occurred for the model import model DMsimp_s_spin1. See this bug:
https://bugs.launchpad.net/maddm/+bug/1971961

Thanks for the consideration!

[Daniele Massaro (dmassaro)]

Hi Mattia,

I committed a fix in the lp:~maddm/maddm/process_keys which you can download.

The main issue is that MadGraph automatically groups different subprocesses when it is faster to compute them together. So they appear like dmdm_wmvll or dmdm_zvlvl. So far it is not possible to translate back the key name to one of a generated process.

Cheers.
--
Daniele

[Mattia Di Mauro (mdimauro)]

Thanks Daniele. the fix solves the issue.