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A framework for fast simulation of a generic collider experiment

Delphes is a C++ framework, performing a fast multipurpose detector response simulation. The simulation includes a tracking system, embedded into a magnetic field, calorimeters and a muon system. The framework is interfaced to standard file formats (e.g. Les Houches Event File or HepMC) and outputs observables such as isolated leptons, missing transverse energy and collection of jets which can be used for dedicated analyses. The simulation of the detector response takes into account the effect of magnetic field, the granularity of the calorimeters and sub-detector resolutions. Visualisation of the final state particles is also built-in using the corresponding ROOT library.

Community and support

The Delphes development model is community-based. Users willing to participate are encouraged to fork Delphes Git repository and to submit pull requests for improvements and bug fixes. The Delphes core development team from the CP3 center of the Université catholique de Louvain is in charge of the maintenance, releases, and general support to users via the ticket system.


Documentation is collected in the WorkBook. Good starting point is the Quick Tour.


If you use Delphes as part of a publication, you should include a citation to:

JHEP 02 (2014) 057 [ arXiv:1307.6346 [hep-ex] ]

Optionally, you can also include a citation to:

J.Phys.Conf.Ser. 523 (2014) 012033 [ inspire link ]

J.Phys.Conf.Ser. 608 (2015) 1, 012045 [ inspire link ]

Also, please note that Delphes relies on a few external packages. If they are used they should be cited as well. For instance, the jet clustering procedure in Delphes is performed via the FastJet package. If your analysis involves jets, you should explicitly include both a reference for the FastJet package and for the relevant clustering algorithm you are using.

For more information on how to properly cite FastJet, please visit this page.

Git access

The code is now fully on GitHub. You can get the latest version of the code using the command:

git clone

Latest tickets

Results (1 - 10 of 425)

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Ticket Resolution Summary Owner Reporter Status Priority Created
#994 Usage of BTag in CMS PhaseII card and PyRoot example alexandra new minor 16 hours
#993 Only fastjet and lepton isolation jyotiranjan new minor 4 days
#989 Questions about b-tagging and EFlow notacreditcard new minor 10 days
#988 Non-isolated muon disappear xun new minor 10 days
#987 Delphes installation in Madgraph Chang new minor 11 days
#986 Segmentation fault in EventDisplay example mhutcheon new minor 12 days
#982 Segmentation Fault in PileUp example mhutcheon new major 2 weeks
#981 Delphes FastJet sphys new minor 2 weeks
#980 Example3.C of Delphes example code abhishek new major 3 weeks
#976 Error running DelphesCMSFWLite on CMS GEN-SIM file smalik new minor 3 weeks
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