Limitations of PARTICLE_CONTAINER

[Frank Siegert]

The keyword 'PARTICLE_CONTAINER' allows to define custom particle containers, which is useful to simplify process listings. In some cases though, these containers will show unexpected behaviour compared to using their contents directly.

Example Run.dat without using the containers integrates fine:

(run){
  BEAM_1=2212
  BEAM_2=2212
  BEAM_ENERGY_1=3500
  BEAM_ENERGY_2=3500

  MASSIVE[5]=1
}(run)

(processes){
  Process 93 93 -> 5 -5
  End process;
}(processes)

(selector){
  METS sqr(20.0/E_CMS)
}(selector)

Example Run.dat with containers integrates to nan:

(run){
  BEAM_1=2212
  BEAM_2=2212
  BEAM_ENERGY_1=3500
  BEAM_ENERGY_2=3500

  MASSIVE[5]=1
  PARTICLE_CONTAINER 905 bottoms 5 -5
}(run)

(processes){
  Process 93 93 -> 905 905
  End process;
}(processes)

(selector){
  METS sqr(20.0/E_CMS)
}(selector)

I thought the METS jet finder is applied on the single process level, so I don't quite understand why this makes a difference here.