Add Angantyr O-O cfg

Author: ddobrigk

MC/config/common/pythia8/generator/pythia8_OO.cfg

@@ -0,0 +1,15 @@
+### beams
+Beams:idA 1000080160		# Pb
+Beams:idB 1000080160		# Pb
+Beams:eCM 6800. 		# GeV
+
+### heavy-ion settings (valid for O-O 6800 only)
+HeavyIon:SigFitNGen 0
+HeavyIon:SigFitDefPar = 2.24,17.39,0.32
+HeavyIon:bWidth	6.		# oxygen in TGlauberMC: R 2.608, A 0.513
+
+### processes (apparently not to be defined)
+
+### decays
+ParticleDecays:limitTau0 on	
+ParticleDecays:tau0Max 10.