configuration file for CLR-BLC3 tune (#2200)

* configuration file for CLR-BLC3 tune

* configuration for CLR-BLC3

---------

Co-authored-by: Navneet <navneet.kumar@cern.ch>

Author: navneetkumar231295

MC/config/ALICE3/ini/pythia8_pp_ropes1_13tev.ini

@@ -6,4 +6,4 @@ fileName=${O2DPG_MC_CONFIG_ROOT}/MC/config/ALICE3/pythia8/generator_pythia8_ALIC
 funcName=generator_pythia8_ALICE3()
 
 [GeneratorPythia8]
-config=${O2DPG_MC_CONFIG_ROOT}/MC/config/ALICE3/pythia8/generator/pythia8_pp_ropes_13tev.cfg
+config=${O2DPG_MC_CONFIG_ROOT}/MC/config/ALICE3/pythia8/generator/pythia8_pp_ropes3_13tev.cfg

MC/config/ALICE3/pythia8/generator/pythia8_pp_ropes3_13tev.cfg

@@ -0,0 +1,44 @@
+### ============================================
+###  PYTHIA 8 — CLR-BLC Mode 3 configuration
+###  Based on table: Monash vs CLR-BLC (Mode 3)
+### ============================================
+
+### Beams
+Beams:idA = 2212
+Beams:idB = 2212
+Beams:eCM = 13000.
+Beams:frameType = 1
+
+### Decays (match ALICE)
+ParticleDecays:limitTau0 = on
+ParticleDecays:tau0Max   = 10.0
+
+### Processes and base tune
+SoftQCD:inelastic = on      # all inelastic processes
+Tune:pp = 14                # Monash 2013 as baseline 
+
+### String fragmentation
+StringPT:sigma   = 0.335    
+StringZ:aLund    = 0.36     
+StringZ:bLund    = 0.56     
+StringFlav:probQQtoQ  = 0.078   # probQQtoQ → Q (Mode 3) 
+StringFlav:probStoUD  = 0.20    # s/u,d suppression (Mode 3) 
+
+# Diquark–diquark join probabilities (vector of 4 numbers)
+StringFlav:probQQ1toQQ0join = 0.0275,0.0275,0.0275,0.0275   # Mode 3 
+### Multi-parton interactions
+MultiPartonInteractions:pT0Ref = 2.05   # Mode 3 pT0Ref 
+
+### Beam remnants
+BeamRemnants:remnantMode = 1           # required for CR mode 1 
+BeamRemnants:saturation  = 5           
+
+### Colour reconnection: CLR-BLC Mode 3
+ColourReconnection:mode              = 1     # new CR scheme
+ColourReconnection:allowDoubleJunRem = off   # as in table
+ColourReconnection:m0                = 0.3   # Mode 3 mass scale
+ColourReconnection:allowJunctions    = on
+ColourReconnection:junctionCorrection = 1.15 # Mode 3
+ColourReconnection:timeDilationMode  = 3     # Mode 3
+ColourReconnection:timeDilationPar   = 0.073 # Mode 3
+