Dear Madgraph, I have been using Madgraph (subroutine standalone_cpp) to get the squared matrix elements for a SUSY UFO model for dark matter. However I got an error. I did this: Import model MSSM_UFO2 --modelname generate n1 n1 > h1 h1 output standalone_cpp nnhh and, I got: MG5_aMC>import model MSSM_UFO2/ --modelname Kept definitions of multiparticles p / j / l+ / l- / vl / vl~ unchanged Defined multiparticle all = g a nu1 nu2 nu3 nu1bar nu2bar nu3bar go sd1 sd2 sd3 sd4 sd5 sd6 su1 su2 su3 su4 su5 su6 sd1c sd2c sd3c sd4c sd5c sd6c su1c su2c su3c su4c su5c su6c d1 d2 d3 u1 u2 u3 d1bar d2bar d3bar u1bar u2bar u3bar sv1 sv2 sv3 se1 se2 se3 se4 se5 se6 h1 h2 ah2 hm2c z wmc sv1c sv2c sv3c se1c se2c se3c se4c se5c se6c hm2 wm n1 n2 n3 n4 c1bar c2bar e1 e2 e3 c1 c2 e1bar e2bar e3bar MG5_aMC>generate n1 n1 > h1 h1 INFO: Checking for minimal orders which gives processes. INFO: Please specify coupling orders to bypass this step. INFO: Trying process: n1 n1 > h1 h1 BSM<=1 HIG<=1 HIW<=1 WEIGHTED<=4 @1 INFO: Process has 10 diagrams 1 processes with 10 diagrams generated in 0.879 s Total: 1 processes with 10 diagrams MG5_aMC>output standalone_cpp nnhh INFO: Creating subdirectories in directory /home/javier/Documentos/MG5_aMC_v2_9_4/nnhh INFO: Organizing processes into subprocess groups INFO: Generating Helas calls for process: n1 n1 > h1 h1 BSM<=1 HIG<=1 HIW<=1 WEIGHTED<=4 @1 INFO: Processing color information for process: n1 n1 > h1 h1 BSM<=1 HIG<=1 HIW<=1 @1 INFO: Creating files in directory /home/javier/Documentos/MG5_aMC_v2_9_4/nnhh/SubProcesses/P1_Sigma_MSSM_UFO2_n1n1_h1h1 INFO: Created files CPPProcess.h and CPPProcess.cc in directory /home/javier/Documentos/MG5_aMC_v2_9_4/nnhh/SubProcesses/P1_Sigma_MSSM_UFO2_n1n1_h1h1/. Generated helas calls for 1 subprocesses (10 diagrams) in 0.014 s Error detected in "output standalone_cpp nnhh" write debug file MG5_debug If you need help with this issue please contact us on https://answers.launchpad.net/mg5amcnlo str : Only support for SLHA blocks with 1 or 2 indices Nonetheless, when I did the same but with output "standalone" only (no "_cpp") everything works well. It is also ok when I used without standalone subrutine. I would very appreciate your help in fixing this error. Best regards, Javier.

When	Who	Action	New State
2021-08-26	Olivier Mattelaer	Answer	Answered
2021-08-27	Javier	Confirm	Solved
2021-08-27	Javier	Confirm	Solved

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