Diphotons NLO subtraction not working

[Frank Siegert]

Since the change in r23258 the CS subtraction in Amegic for diphoton production does not work. Writing and compiling the libraries is fine, but then on the re-run it exits with:

Matrix_Element_Handler::BuildProcesses(): Looking for processes ....IO_Handler::SetFileNameRO: /home/fsiegert/sherpa/tests/diphoton/fo/dy-test/Process/Amegic/P2_2/0/Sfunc.dat not available.
Sherpa: AMEGIC::operator>> throws critical error: 
   String to momfunc translation failed.

This happens also in other processes, where e.g. ccbar can be mapped to uubar which has been mapped to ddbar initial states, e.g. in DY if the Z is disabled.

A simple run card to reproduce this is:

(run){
  ME_SIGNAL_GENERATOR Amegic;
  EVENT_GENERATION_MODE Weighted;

  BEAM_1 2212; BEAM_ENERGY_1 = 3500.;
  BEAM_2 2212; BEAM_ENERGY_2 = 3500.;
}(run)

(processes){
  Process 93 93 -> 22 22;
  NLO_QCD_Mode Fixed_Order;
  NLO_QCD_Part I;
  Order_EW 2;
  End process;
}(processes)

(selector){
  PTNLO 22 20.0 E_CMS
  IsolationCut 22 0.4 2 0.025;
}(selector)

Without changeset r23258 it works fine.

[Frank Siegert]

This is fixed with r24136 (thanks, Stefan!).