add first version of LHEonly.py common fragment to produce 1 Pythia8 even in...

add first version of LHEonly.py common fragment to produce 1 Pythia8 even in case of LHE only production,
and skeleton for LHE only production

Generators/EvgenJobTransforms/share/LHEonly.py

+# Common fragment for generation of 1 Pythia8 event, when producing LHE output only
+# It is needed to make the transform run
+# No output is kept from this generation
+## Base config for Pythia8
+
+from Pythia8_i.Pythia8_iConf import Pythia8_i
+genSeq += Pythia8_i("Pythia8")
+
+genSeq.Pythia8.Commands += [
+    "Main:timesAllowErrors = 500",
+    "6:m0 = 172.5",
+    "23:m0 = 91.1876",
+    "23:mWidth = 2.4952",
+    "24:m0 = 80.399",
+    "24:mWidth = 2.085",
+    "StandardModel:sin2thetaW = 0.23113",
+    "StandardModel:sin2thetaWbar = 0.23146",
+    "ParticleDecays:limitTau0 = on",
+    "ParticleDecays:tau0Max = 10.0"]
+
+genSeq.Pythia8.Commands += [
+    "Tune:pp = 5",
+    "MultipartonInteractions:bProfile = 4",
+    "MultipartonInteractions:a1 = 0.03",
+    "MultipartonInteractions:pT0Ref = 1.90",
+    "MultipartonInteractions:ecmPow = 0.30",
+    "PDF:pSet=LHAPDF6:MSTW2008lo68cl",
+    "ColourReconnection:range=2.28",
+    "SoftQCD:inelastic = on",
+    "SpaceShower:rapidityOrder=0"]
+
+evgenConfig.minevents = 1
+del testSeq.TestHepMC
+
+
+
+