Update Pythia8 HeavyIon paramenters

Author: preghenella

MC/config/common/pythia8/generator/pythia8_hi.cfg

@@ -4,9 +4,9 @@ Beams:idB 1000822080		# Pb
 Beams:eCM 5520. 		# GeV
 
 ### heavy-ion settings (valid for Pb-Pb 5520 only)
-HeavyIon:SigFitNGen 0
-HeavyIon:SigFitDefPar 14.82,1.82,0.25,0.0,0.0,0.0,0.0,0.0
-HeavyIon:bWidth	15.		# impact parameter from 0-x [fm]
+HeavyIon:SigFitNGen = 0
+HeavyIon:SigFitDefPar = 13.88,1.84,0.22,0.0,0.0,0.0,0.0,0.0
+HeavyIon:bWidth = 14.48
 
 ### processes (apparently not to be defined)