root tree description


Branches


Branch Definition Class
Event generated event from LHEF TRootLHEFEvent
Particle generated partons from LHEF TRootLHEFParticle
Event information about generated event TRootGenEvent
GenParticle generated particles from HEPEVT TRootGenParticle
Event information about reconstructed event TRootEvent
Photon reconstructed photons TRootPhoton
Electron reconstructed electrons TRootElectron
Muon reconstructed muons TRootMuon
Tau reconstructed hadronically-decaying tau leptons TRootTau
Jet reconstructed jets TRootJet
MissingET missing transverse energy TRootMissingET

Classes


Parameter Definition How it was calculated

TRootLHEFEvent


Number event number
Nparticles number of particles in the event hepup.NUP
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
CouplingQED value of the QED coupling used in the event hepup.AQEDUP
CouplingQCD value of the QCD coupling used in the event hepup.AQCDUP

TRootLHEFParticle


PID particle HEP ID number hepup.IDUP[number]
Status particle status code hepup.ISTUP[number]
Mother1 index for the particle first mother hepup.MOTHUP[number][0]
Mother2 index for the particle last mother hepup.MOTHUP[number][1]
ColorLine1 index for the particle color-line hepup.ICOLUP[number][0]
ColorLine2 index for the particle anti-color-line hepup.ICOLUP[number][1]
Px particle momentum vector (x component) hepup.PUP[number][0]
Py particle momentum vector (y component) hepup.PUP[number][1]
Pz particle momentum vector (z component) hepup.PUP[number][2]
E particle energy hepup.PUP[number][3]
M particle mass hepup.PUP[number][4]
PT particle transverse momentum
Eta particle pseudorapidity
Phi particle azimuthal angle
LifeTime particle invariant lifetime (c*tau, distance from production to decay in mm) hepup.VTIMUP[number]
Spin cosine of the angle between the particle spin vector and the decaying particle 3-momentum, specified in the lab frame. hepup.SPINUP[number]

TRootGenEvent


Number event number hepevt.nevhep

TRootGenParticle


PID particle HEP ID number hepevt.idhep[number]
Status particle status hepevt.isthep[number]
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 2nd daughter hepevt.jdahep[number][1] - 1
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
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]

TRootEvent


Number event number
Trigger trigger word

TRootMissingET


MET mising transverse energy
Phi mising energy azimuthal angle

TRootPhoton


PT photon transverse momentum
Eta photon pseudorapidity
Phi photon azimuthal angle
EhadOverEem ratio of the hadronic versus electromagnetic energy deposited in the calorimeter

TRootElectron


PT electron transverse momentum
Eta electron pseudorapidity
Phi electron azimuthal angle
Charge electron charge
Ntrk number of tracks associated with the electron
EhadOverEem ratio of the hadronic versus electromagnetic energy deposited in the calorimeter

TRootMuon


PT muon transverse momentum
Eta muon pseudorapidity
Phi muon azimuthal angle
Charge muon charge
Ntrk number of tracks associated with the muon
PTiso sum of tracks transverse momentum within a cone of radius R=0.4 centered on the muon (excluding the muon itself)
ETiso ratio of ET in a 3x3 calorimeter cells array around the muon (including the muon's cell) to the muon PT
JetIndex index of the closest jet

TRootTau


PT tau transverse momentum
Eta tau pseudorapidity
Phi tau azimuthal angle
Charge tau charge
Ntrk number of charged tracks associated with the tau
EhadOverEem ratio of the hadronic versus electromagnetic energy deposited in the calorimeter

TRootJet


PT jet transverse momentum
Eta jet pseudorapidity
Phi jet azimuthal angle
Mass jet invariant mass
Ntrk number of tracks associated with the jet
BTag 1 or 2 for a jet that has been tagged as containing a heavy quark
EhadOverEem ratio of the hadronic versus electromagnetic energy deposited in the calorimeter
Index jet index in the LHC Olympics file