Root Tree Description

Description of all classes used to store output data.

Parameter	Definition	How it was calculated
class Event
Number	event number
class LHCOEvent
Event	LHCOEvent inherits all Event parameters
Trigger	trigger word
class 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
class 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()
class GenParticle
PID	particle HEP ID number	hepevt.idhep[number]
Status	generator specific status code: ​HepMC status codes, ​Herwig status codes, ​Herwig++ status codes, ​Pythia status codes	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 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]
class MissingET
MET	mising transverse energy
Phi	mising energy azimuthal angle
class ScalarHT
HT	scalar sum of transverse momenta
class Photon
PT	photon transverse momentum
Eta	photon pseudorapidity
Phi	photon azimuthal angle
E	photon energy
Particles	references to generated particles
class Electron
PT	electron transverse momentum
Eta	electron pseudorapidity
Phi	electron azimuthal angle
Charge	electron charge
Particle	reference to generated particle
class Muon
PT	muon transverse momentum
Eta	muon pseudorapidity
Phi	muon azimuthal angle
Charge	muon charge
Particle	reference to generated particle
class 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
Constituents	references to constituents
Particles	references to generated particles
class 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
class 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