add param for OO based on pythia

Author: hscheid

MC/config/PWGEM/parametrizations/OO_536TeV_param.json

@@ -0,0 +1,10 @@
+{
+    "536TeV_MB_pythia": {
+        "111_pt": "56.6336*x*pow(1+(sqrt(x*x+0.138918*0.138918)-0.138918)/(6.8304*0.139501),-6.8304)",
+        "221_pt": "1939.44*x*pow(1+(sqrt(x*x+-0.424653*-0.424653)--0.424653)/(6.84504*0.0745758),-6.84504)",
+        "331_pt": "2.89402*x*pow(1+(sqrt(x*x+-0.322689*-0.322689)--0.322689)/(8.32826*0.211736),-8.32826)",
+        "113_pt": "75.4035*x*pow(1+(sqrt(x*x+-0.360389*-0.360389)--0.360389)/(7.74615*0.16301),-7.74615)",
+        "223_pt": "2.29*x*pow(1+(sqrt(x*x+0.405007*0.405007)-0.405007)/(7.61366*0.243978),-7.61366)",
+        "333_pt": "0.646087*x*pow(1+(sqrt(x*x+-0.257169*-0.257169)--0.257169)/(8.17199*0.261382),-8.17199)"
+    }
+}