Transport only primaries produced in the barrel for the HF embedding benchmark

Author: preghenella

MC/config/PWGHF/ini/GeneratorHF.ini

@@ -26,3 +26,9 @@ config[2] = ${O2DPG_ROOT}/MC/config/PWGHF/pythia8/decayer/force_hadronic_D_use4b
 
 [SimUserDecay]
 pdglist = 411 421 431 4112 4122 4232 4132
+
+### The setup inhibits transport of primary particles which are produce at forward rapidity.
+### The settings below only transports particles in the barrel, which is currently defined as |eta| < 2
+
+[Stack]
+transportPrimary = barrel