IOMC-Input

Data files for IOMC/Input

Files

TTbar_13TeV_TuneCUETP8M1_HepMC3.hepmc3

HepMC3 Asciiv3 input for the MCFileSource3 unit test (IOMC/Input/test/testReader3_cfg.py).

• 50 events, inclusive t{\bar t} at 13 TeV
• Configuration/Generator/python/TTbar_13TeV_TuneCUETP8M1_cfi.py, generated with Pythia8HepMC3GeneratorFilter so the record is native HepMC3 rather than converted from HepMC2
• beamspot Realistic25ns13TeVEarly2018Collision, conditions auto:phase1_2018_realistic (150X_mc2018_realistic_v1), CMSSW_20_1_0_pre3
• ~1500 particles and ~870 vertices per event, 13 MB

Produced after cms-sw/cmssw#51857. Before that fix, HepMC3Product::applyVtxGen appended to an un-cleared GenEventData, so every vertex-smeared HepMC3 record was stored twice with the duplicates unlinked. A file made from an unpatched release has exactly twice the particles of its generator:unsmeared counterpart and roughly half of them carrying no production vertex; this one has the same counts as the unsmeared record and two beam particles per event, as it should.