root tree description


Classes


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