Dataset

The dataset used in this repository is:

Duarte, Javier; (2019). Sample with jet, track and secondary vertex properties for Hbb tagging ML studies HiggsToBBNTuple_HiggsToBB_QCD_RunII_13TeV_MC. CERN Open Data Portal. https://doi.org/10.7483/OPENDATA.CMS.JGJX.MS7Q

The dataset consists of particle jets extracted from simulated proton-proton collision events at a center-of-mass energy of 13 TeV generated with Pythia 8. It has been produced for developing machine-learning algorithms to differentiate jets originating from a Higgs boson decaying to a bottom quark-antiquark pair (Hbb) from quark or gluon jets originating from quantum chromodynamic (QCD) multijet production. The reconstructed jets are clustered using the anti-kT algorithm with R=0.8 from particle flow (PF) candidates (AK8 jets). The standard L1+L2+L3+residual jet energy corrections are applied to the jets and pileup contamination is mitigated using the charged hadron subtraction (CHS) algorithm. Features of the AK8 jets with transverse momentum pT > 200 GeV and pseudorapidity |η| < 2.4 are provided. Selected features of inclusive (both charged and neutral) PF candidates with pT > 0.95 GeV associated to the AK8 jet are provided. Additional features of charged PF candidates (formed primarily by a charged particle track) with pT > 0.95 GeV associated to the AK8 jet are also provided. Finally, additional features of reconstructed secondary vertices (SVs) associated to the AK8 jet (within ∆R < 0.8) are also provided.

The features we use are as follows:

Data variable	Type	Description
sample_isQCD	Int_t	Boolean that is 1 if the simulated sample corresponds to QCD multijet production
fj_doubleb	Float_t	Double-b tagging discriminant based on a boosted decision tree calculated for the AK8 jet (see [CMS-BTV-16-002](http://cms-results.web.cern.ch/cms-results/public-results/publications/BTV-16-002/))
fj_eta	Float_t	Pseudorapidity η of the AK8 jet
fj_isH	Int_t	Boolean that is 1 if a generator-level Higgs boson and its daughters are geometrically matched to the AK8 jet
fj_isQCD	Int_t	Boolean that is 1 if none of the above matching criteria are satisfied (H, top, W, Z)
fj_jetNTracks	Float_t	Number of tracks associated with the AK8 jet
fj_nSV	Float_t	Number of SVs associated with the AK8 jet (∆R < 0.7)
fj_phi	Float_t	Azimuthal angle ϕ of the AK8 jet
fj_pt	Float_t	Transverse momentum of the AK8 jet
fj_sdmass	Float_t	Soft drop mass of the AK8 jet
fj_z_ratio	Float_t	z ratio variable as defined in [CMS-BTV-16-002](http://cms-results.web.cern.ch/cms-results/public-results/publications/BTV-16-002/)
fj_trackSipdSig_0	Float_t	First largest track 3D signed impact parameter significance (see [CMS-BTV-16-002](http://cms-results.web.cern.ch/cms-results/public-results/publications/BTV-16-002/) )
fj_trackSipdSig_1	Float_t	Second largest track 3D signed impact parameter significance (see [CMS-BTV-16-002](http://cms-results.web.cern.ch/cms-results/public-results/publications/BTV-16-002/) )
fj_trackSipdSig_2	Float_t	Third largest track 3D signed impact parameter significance (see [CMS-BTV-16-002](http://cms-results.web.cern.ch/cms-results/public-results/publications/BTV-16-002/) )
fj_trackSipdSig_3	Float_t	Fourth largest track 3D signed impact parameter significance (see [CMS-BTV-16-002](http://cms-results.web.cern.ch/cms-results/public-results/publications/BTV-16-002/) )
fj_trackSipdSig_0_0	Float_t	First largest track 3D signed impact parameter significance associated to the first N-subjettiness axis
fj_trackSipdSig_0_1	Float_t	Second largest track 3D signed impact parameter significance associated to the first N-subjettiness axis
fj_trackSipdSig_1_0	Float_t	First largest track 3D signed impact parameter significance associated to the second N-subjettiness axis
fj_trackSipdSig_1_1	Float_t	Second largest track 3D signed impact parameter significance associated to the second N-subjettiness axis
fj_trackSip2dSigAboveCharm_0	Float_t	Track 2D signed impact parameter significance of the first track lifting the combined invariant mass of the tracks above the c hadron threshold mass (1.5 GeV)
fj_trackSip2dSigAboveBottom_0	Float_t	Track 2D signed impact parameter significance of the first track lifting the combined invariant mass of the tracks above b hadron threshold mass (5.2 GeV)
fj_trackSip2dSigAboveBottom_1	Float_t	Track 2D signed impact parameter significance of the second track lifting the combined invariant mass of the tracks above b hadron threshold mass (5.2 GeV)
fj_tau0_trackEtaRel_0	Float_t	Smallest track pseudorapidity ∆η, relative to the jet axis, associated to the first N-subjettiness axis
fj_tau0_trackEtaRel_1	Float_t	Second smallest track pseudorapidity ∆η, relative to the jet axis, associated to the first N-subjettiness axis
fj_tau0_trackEtaRel_2	Float_t	Third smallest track pseudorapidity ∆η, relative to the jet axis, associated to the first N-subjettiness axis
fj_tau1_trackEtaRel_0	Float_t	Smallest track pseudorapidity ∆η, relative to the jet axis, associated to the second N-subjettiness axis
fj_tau1_trackEtaRel_1	Float_t	Second smallest track pseudorapidity ∆η, relative to the jet axis, associated to the second N-subjettiness axis
fj_tau1_trackEtaRel_2	Float_t	Third smallest track pseudorapidity ∆η, relative to the jet axis, associated to the second N-subjettiness axis
fj_tau_vertexMass_0	Float_t	Total SV mass for the first N-subjettiness axis, defined as the invariant mass of all tracks from SVs associated with the first N-subjettiness axis
fj_tau_vertexMass_1	Float_t	Total SV mass for the second N-subjettiness axis, defined as the invariant mass of all tracks from SVs associated with the second N-subjettiness axis
fj_tau_vertexEnergyRatio_0	Float_t	SV vertex energy ratio for the first N-subjettiness axis, defined as the total energy of all SVs associated with the first N-subjettiness axis divided by the total energy of all the tracks associated with the AK8 jet that are consistent with the PV
fj_tau_vertexEnergyRatio_1	Float_t	SV energy ratio for the second N-subjettiness axis, defined as the total energy of all SVs associated with the first N-subjettiness axis divided by the total energy of all the tracks associated with the AK8 jet that are consistent with the PV
fj_tau_flightDistance2dSig_0	Float_t	Transverse (2D) flight distance significance between the PV and the SV with the smallest uncertainty on the 3D flight distance associated to the first N-subjettiness axis
fj_tau_flightDistance2dSig_1	Float_t	Transverse (2D) flight distance significance between the PV and the SV with the smallest uncertainty on the 3D flight distance associated to the second N-subjettiness axis
fj_tau_vertexDeltaR_0	Float_t	Pseudoangular distance ∆R between the first N-subjettiness axis and SV direction
n_pfcands	Int_t	Number of particle flow (PF) candidates associated to the AK8 jet with transverse momentum greater than 0.95 GeV
npfcands	Float_t	Number of particle flow (PF) candidates associated to the AK8 jet with transverse momentum greater than 0.95 GeV
pfcand_deltaR	Float_t	Pseudoangular distance ∆R between the PF candidate and the AK8 jet axis
pfcand_drminsv	Float_t	Minimum pseudoangular distance ∆R between the associated SVs and the PF candidate
pfcand_drsubjet1	Float_t	Pseudoangular distance ∆R between the PF candidate and the first soft drop subjet
pfcand_drsubjet2	Float_t	Pseudoangular distance ∆R between the PF candidate and the second soft drop subjet
pfcand_erel	Float_t	Energy of the PF candidate divided by the energy of the AK8 jet
pfcand_etarel	Float_t	Pseudorapidity of the PF candidate relative to the AK8 jet axis
pfcand_phirel	Float_t	Azimuthal angular distance ∆ϕ between the PF candidate and the AK8 jet axis
pfcand_ptrel	Float_t	Transverse momentum of the PF candidate divided by the transverse momentum of the AK8 jet
pfcand_hcalFrac	Float_t	Fraction of energy of the PF candidate deposited in the hadron calorimeter
pfcand_puppiw	Float_t	Pileup per-particle identification (PUPPI) weight indicating whether the PF candidate is pileup-like (0) or not (1)
n_tracks	Int_t	Number of tracks associated with the AK8 jet
ntracks	Float_t	Number of tracks associated with the AK8 jet
trackBTag_DeltaR	Float_t	Pseudoangular distance ∆R between the track and the AK8 jet axis
trackBTag_EtaRel	Float_t	Pseudorapidity ∆η of the track relative the AK8 jet axis
trackBTag_JetDistVal	Float_t	Minimum track approach distance to the AK8 jet axis
trackBTag_PParRatio	Float_t	Component of track momentum parallel to the AK8 jet axis, normalized to the track momentum
trackBTag_PtRatio	Float_t	Component of track momentum perpendicular to the AK8 jet axis, normalized to the track momentum
trackBTag_Sip2dVal	Float_t	Transverse (2D) signed impact paramater of the track
trackBTag_Sip2dSig	Float_t	Transverse (2D) signed impact paramater significance of the track
trackBTag_Sip3dSig	Float_t	3D signed impact parameter significance of the track
trackBTag_Sip3dVal	Float_t	3D signed impact parameter of the track
track_deltaR	Float_t	Pseudoangular distance (∆R) between the charged PF candidate and the AK8 jet axis
track_detadeta	Float_t	Track covariance matrix entry (eta, eta)
track_dlambdadz	Float_t	Track covariance matrix entry (lambda, dz)
track_dphidphi	Float_t	Track covariance matrix entry (phi, phi)
track_dphidxy	Float_t	Track covariance matrix entry (phi, xy)
track_dptdpt	Float_t	Track covariance matrix entry (pT, pT)
track_dxydxy	Float_t	Track covariance matrix entry (dxy, dxy)
track_dxydz	Float_t	Track covariance matrix entry (dxy, dz)
track_dzdz	Float_t	Track covariance matrix entry (dz, dz)
track_drminsv	Float_t	Minimum pseudoangular distance ∆R between the associated SVs and the charged PF candidate
track_dxy	Float_t	Transverse (2D) impact parameter of the track, defined as the distance of closest approach of the track trajectory to the beam line in the transverse plane to the beam
track_dxysig	Float_t	Transverse (2D) impact parameter significance of the track
track_dz	Float_t	Longitudinal impact parameter, defined as the distance of closest approach of the track trajectory to the PV projected on to the z direction
track_dzsig	Float_t	Longitudinal impact parameter significance of the track
track_erel	Float_t	Energy of the charged PF candidate divided by the energy of the AK8 jet
track_etarel	Float_t	Pseudorapidity ∆η of the track relative to the jet axis
track_mass	Float_t	Mass of the charged PF candidate
track_normchi2	Float_t	Normalized χ2 of the track fit
track_phirel	Float_t	Azimuthal angular distance ∆ϕ between the charged PF candidate and the AK8 jet axis
track_pt	Float_t	Transverse momentum of the charged PF candidate
track_ptrel	Float_t	Transverse momentum of the charged PF candidate divided by the transverse momentum of the AK8 jet
track_puppiw	Float_t	Pileup per-particle identification (PUPPI) weight indicating whether the PF candidate is pileup-like (0) or not (1)
track_quality	Float_t	Track quality: undefQuality=-1; loose=0; tight=1; highPurity=2; confirmed=3, if track found by more than one iteration; looseSetWithPV=5; highPuritySetWithPV=6, discarded=7 if a better track found; qualitySize=8
n_sv	Int_t	Number of secondary vertices (SV) associated with the AK8 jet (∆R < 0.8)
nsv	Float_t	Number of secondary vertices (SV) associated with the AK8 jet (∆R < 0.8)
sv_chi2	Float_t	χ2 of the vertex fit
sv_normchi2	Float_t	χ2 divided by the number of degrees of freedom for the vertex fit
sv_costhetasvpv	Float_t	Cosine of the angle cos(θ) between the SV and the PV
sv_d3d	Float_t	3D flight distance of the SV
sv_d3derr	Float_t	3D flight distance uncertainty of the SV
sv_d3dsig	Float_t	3D flight distance significance of the SV
sv_dxy	Float_t	Transverse (2D) flight distance of the SV
sv_dxyerr	Float_t	Transverse (2D) flight distance uncertainty of the SV
sv_dxysig	Float_t	Transverse (2D) flight distance significance of the SV
sv_deltaR	Float_t	Pseudoangular distance ∆R between the SV and the AK8 jet
sv_erel	Float_t	Energy of the SV divided by the energy of the AK8 jet
sv_etarel	Float_t	Pseudorapidity ∆η of the SV relative to the AK8 jet axis
sv_mass	Float_t	Mass of the SV
sv_ntracks	Float_t	Number of tracks associated with the SV
sv_phirel	Float_t	Azimuthal angular distance ∆ϕ of the SV relative to the jet axis
sv_pt	Float_t	Transverse momentum of the SV
sv_ptrel	Float_t	Transverse momentum of the SV divided by the transverse momentum of the AK8 jet