These objects can be accessed in a software module which can be built with a helper script available in the CMS open data environment. You can find more information on each object in the CMS Open Data guide (e.g. Note that many of the basic properties are "inherited" from the parent classes, and are listed separately under "Public Member Functions inherited from. The reco::GsfElectron Class Reference lists all member functions through which the different properties of a reconstructed electron can be accessed. To see the properties of electrons, you would navigate to the namespace "reco" and find the entry for GsfElectron. The objects are implemented as C++ classes in the CMS software package CMSSW, and detailed reference documentation of all classes is available in the class list of the CMSSW reference manual. Trigger::TriggerEvent "hltTriggerSummaryAOD" "" "HLT" ĭocumentation of the objects of main interest to physics analysis is available in the CMS Open Data guide. You can select a file, (a listing is available for each dataset record) and print out it contents with:Įdm::TriggerResults "TriggerResults" "" "HLT" Select a dataset, for example, the ElectronHad dataset from Run2012A. Make sure that you are in the CMSSW_5_3_32/src/ folder (and, in VM, you have executed the cmsenv command in your terminal). The files cannot be opened and understood as simple data tables but require ROOT, a framework used by several particle-physics experiments to work with the collected data, in order to be read.īut let's first see what an AOD file contains. These AOD files are prepared by piecing raw data collected by various sub-detectors of CMS and contain all the information that is needed for analysis. The primary data provided by CMS on the CERN Open Data Portal are in a format called " Analysis Object Data" or AOD for short. Make sure that you are always in the CMSSW_5_3_32/src/ directory, both in the CMS open data container and in the VM (and in the "CMS Shell" terminal in VM). $ cmsenv # do not execute this command if you are working in the container
0 Comments
Leave a Reply. |