adjust Q2PTCUTOFF calc

we can now pass 'ccdb' as field option
in which case Q2PTCUTOFF is not easy to calc
but TPC will do this internally in the future

Author: sawenzel

MC/bin/o2dpg_sim_workflow.py

@@ -188,11 +188,12 @@ def addWhenActive(detID, needslist, appendstring):
 RNDSEED=args.seed    # 0 means random seed ! Should we set different seed for Bkg and signal?
 
 Q2PTCUTOFF=20 # nominal q/Pt cut-off for TPC
-if float(BFIELD)!=0:
+if BFIELD == 'ccdb':
+   # a hack valid for pilot beam (but TPC will calc this internally in the future)
+   Q2PTCUTOFF*=5/abs(float(2.));
+elif float(BFIELD)!=0:
    Q2PTCUTOFF*=5/abs(float(BFIELD));
 
-# add here other possible types
-
 workflow={}
 workflow['stages'] = []