Datasets derived from the Run2011A SingleElectron, SingleMu, DoubleElectron, and DoubleMu primary datasets
McCauley, Thomas
Dataset Derived Education CMS CERN-LHC
Description
These data were selected from the primary datasets in order to obtain candidate J/psi and Y events, candidate W and Z boson events, and general di-electron and dimuon spectra.
These data were selected for use in education and outreach and contain a subset of the total event information. They are not suitable for a full physics analysis.
Dataset semantics
| Variable | Type | Description |
|---|---|---|
| Run | The run number of the event. | |
| Event | The event number. | |
| E,px,py,pz | For a lepton, either a muon or an electron, the total energy and components of the momemtum (in GeV). | |
| pt | The transverse momentum of the lepton (in units of GeV), either a muon or an electron. | |
| eta | The pseudorapidity of the lepton, either a muon or an electron. | |
| phi | The phi angle (in radians) of the lepton, either a muon or an electron. | |
| Q | The charge of the lepton, either a muon or an electron. | |
| M | The invariant mass (in GeV) of either two muons or two electrons. | |
| chiSq | The chi-squared per degree-of-freedom of the lepton, either a muon or an electron. | |
| dxy | The impact parameter in the transverse plane with respect to the vertex of the muon or electron. | |
| iso | The combined isolation (Itrack + Iecal + Ihcal) of the muon. | |
| MET | The missing transverse momentum of the event (in units of GeV). | |
| phiMET | The phi angle (in radians) of the missing transverse momentum. | |
| type | For an electron, either EB or EE: whether the electron is in the barrel or in the endcap. | |
| type | For a muon, either T or G: whether the muon is a tracker or global muon. | |
| delEta | The difference in eta (in radians) between the electron track and the associated cluster in the ECAL. | |
| delPhi | The difference in phi (in radians) between the electron track and the associated cluster in the ECAL. | |
| sigmaEtaEta | The weighted cluster rms along eta for an electron. | |
| HoverE | The energy of the electron in the HCAL divided by the energy of the electron in the ECAL. | |
| isoTrack | The isolation variable for the electron in the tracker. | |
| isoEcal | The isolation variable for the electron in the ECAL. | |
| isoHcal | The isolation variable for the electron in the HCAL. |
How were these data selected?
Wmunu
An event was selected if there was one (and only one) global muon in the event that satisfies: pT > 25.0 GeV and |eta| < 2.1. Furthermore, the event was rejected if there was another global muon in the event with pT > 10 GeV in the acceptance region |eta| < 2.4.
Wenu
An event was selected if there is was one electron in the event with pT > 25.0 GeV. Furthermore, the event was rejected if there was a second electron present with pT > 20 GeV.
Zee
An event was selected if there were two electrons in the event with pT > 25 GeV and the invariant mass of the two electrons was > 60 GeV and < 120 GeV.
Zmumu
An event was selected if there were two muons in the event with pT > 20 GeV and |eta| < 2.1 and the invariant mass of the two muons was > 60 GeV and < 120 GeV.
Dimuon
An event was selected if there were two muons in the event, both with |eta| < 2.4, at least one muon was a global muon, the invariant mass of the two muons was > 0.3 GeV and < 300 GeV, and they have opposite-sign charge.
Jpsimumu
An event was selected if there were two muons in the event, both with |eta| < 2.4, at least one muon was a global muon, the invariant mass of the two muons was > 2 GeV and < 5 GeV, and they have opposite-sign charge.
Ymumu
An event was selected if there were two muons in the event, both with |eta| < 2.4, at least one muon was a global muon, the invariant mass of the two muons was > 8 GeV and < 12 GeV, and they have opposite-sign charge.
How can you use these data?
Comma-separated value (csv) files can be used in online applications such as the histogram visualizer and other applications, examples are given in
Jupyter notebooks using CMS Open Data
Disclaimer
These open data are released under the Creative Commons Zero v1.0 Universal license.
Neither the experiment(s) ( CMS ) nor CERN endorse any works, scientific or otherwise, produced using these data.
