stdhep file format

[tomeichlersmith]

My deduction notes...

Indices start at 1 so that 0 can be reserved as a null value.

File

• ilbl: (relic of "lumi block") seems to be a label of some kind, like an ID number to separate one file from another
• the list of events

Event

• nevhep: event number
• nhep: number of particles in this event
• the list of particles

Particle

• isthep: "stage" of particle in event, in some sense particles of the same "stage" exist at the same "time"
• idhep: PDG ID as parsed from LHE
• jmohep: indices of particles who are the mothers of this particle (two, can be the same)
• jdahep: indices of particles who are the daughters of this particle (two, only same if no daughters)
• phep: length-five array [px, py, pz, E, m] in GeV
• vhep: length-four array [x, y, z, t] in mm

[tomeichlersmith]

closing issue so its out of my to do list and I can look it up later for reference if necessary