| Parameter | Definition | How it was calculated |
Event | ||
| Number | event number | |
LHCOEvent | ||
| Event | LHCOEvent inherits all Event parameters | |
| Trigger | trigger word | |
LHEFEvent | ||
| Event | LHEFEvent inherits all Event parameters | |
| ProcessID | subprocess code for the event | hepup.IDPRUP |
| Weight | weight for the event | hepup.XWGTUP |
| ScalePDF | scale in GeV used in the calculation of the PDFs in the event | hepup.SCALUP |
| AlphaQED | value of the QED coupling used in the event | hepup.AQEDUP |
| AlphaQCD | value of the QCD coupling used in the event | hepup.AQCDUP |
HepMCEvent | ||
| Event | HepMCEvent inherits all Event parameters | |
| ProcessID | unique signal process id | signal_process_id() |
| MPI | number of multi parton interactions | mpi () |
| Scale | energy scale, see hep-ph/0109068 | event_scale() |
| AlphaQED | QED coupling, see hep-ph/0109068 | alphaQED() |
| AlphaQCD | QCD coupling, see hep-ph/0109068 | alphaQCD() |
| ID1 | flavour code of first parton | pdf_info()->id1() |
| ID2 | flavour code of second parton | pdf_info()->id2() |
| X1 | fraction of beam momentum carried by first parton ("beam side") | pdf_info()->x1() |
| X2 | fraction of beam momentum carried by second parton ("target side") | pdf_info()->x2() |
| ScalePDF | Q-scale used in evaluation of PDF's (in GeV) | pdf_info()->scalePDF() |
| PDF1 | PDF (id1, x1, Q) | pdf_info()->pdf1() |
| PDF2 | PDF (id2, x2, Q) | pdf_info()->pdf2() |
GenParticle | ||
| PID | particle HEP ID number | hepevt.idhep[number] |
| Status | particle status | hepevt.isthep[number] |
| IsPU | 0 or 1 for particles from pile-up interactions | |
| M1 | particle 1st mother | hepevt.jmohep[number][0] - 1 |
| M2 | particle 2nd mother | hepevt.jmohep[number][1] - 1 |
| D1 | particle 1st daughter | hepevt.jdahep[number][0] - 1 |
| D2 | particle last daughter | hepevt.jdahep[number][1] - 1 |
| Charge | particle charge | |
| Mass | particle mass | |
| E | particle energy | hepevt.phep[number][3] |
| Px | particle momentum vector (x component) | hepevt.phep[number][0] |
| Py | particle momentum vector (y component) | hepevt.phep[number][1] |
| Pz | particle momentum vector (z component) | hepevt.phep[number][2] |
| PT | particle transverse momentum | |
| Eta | particle pseudorapidity | |
| Phi | particle azimuthal angle | |
| Rapidity | particle rapidity | |
| T | particle vertex position (t component) | hepevt.vhep[number][3] |
| X | particle vertex position (x component) | hepevt.vhep[number][0] |
| Y | particle vertex position (y component) | hepevt.vhep[number][1] |
| Z | particle vertex position (z component) | hepevt.vhep[number][2] |
MissingET | ||
| MET | mising transverse energy | |
| Phi | mising energy azimuthal angle | |
ScalarHT | ||
| HT | scalar sum of transverse momenta | |
Photon | ||
| PT | photon transverse momentum | |
| Eta | photon pseudorapidity | |
| Phi | photon azimuthal angle | |
| E | photon energy | |
| EhadOverEem | ratio of the hadronic versus electromagnetic energy deposited in the calorimeter | |
| Particles | references to generated particles | |
Electron | ||
| PT | electron transverse momentum | |
| Eta | electron pseudorapidity | |
| Phi | electron azimuthal angle | |
| Charge | electron charge | |
| EhadOverEem | ratio of the hadronic versus electromagnetic energy deposited in the calorimeter | |
| Particle | reference to generated particle | |
Muon | ||
| PT | muon transverse momentum | |
| Eta | muon pseudorapidity | |
| Phi | muon azimuthal angle | |
| Charge | muon charge | |
| Particle | reference to generated particle | |
Jet | ||
| PT | jet transverse momentum | |
| Eta | jet pseudorapidity | |
| Phi | jet azimuthal angle | |
| Mass | jet invariant mass | |
| BTag | 0 or 1 for a jet that has been tagged as containing a heavy quark | |
| TauTag | 0 or 1 for a jet that has been tagged as a tau | |
| Charge | tau charge | |
| EhadOverEem | ratio of the hadronic versus electromagnetic energy deposited in the calorimeter | |
| Constituents | references to constituents | |
| Particles | references to generated particles | |
Track | ||
| PID | HEP ID number | |
| Charge | track charge | |
| PT | track transverse momentum | |
| Eta | track pseudorapidity | |
| Phi | track azimuthal angle | |
| EtaOuter | track pseudorapidity at the tracker edge | |
| PhiOuter | track azimuthal angle at the tracker edge | |
| X | track vertex position (x component) | |
| Y | track vertex position (y component) | |
| Z | track vertex position (z component) | |
| XOuter | track position (x component) at the tracker edge | |
| YOuter | track position (y component) at the tracker edge | |
| ZOuter | track position (z component) at the tracker edge | |
| Particle | reference to generated particle | |
Tower | ||
| ET | calorimeter tower transverse energy | |
| Eta | calorimeter tower pseudorapidity | |
| Phi | calorimeter tower azimuthal angle | |
| E | calorimeter tower energy | |
| Eem | calorimeter tower electromagnetic energy | |
| Ehad | calorimeter tower hadronic energy | |
| Edges[4] | calorimeter tower edges | |
| Particles | references to generated particles | |