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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.


The Delphes project documentation is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.


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 687)

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Ticket Resolution Summary Reporter Status Priority Modified
#1410 Muon Reconstruction shivaparadox new minor 22 hours
#1413 Question about Particle and Selecting Certain Events usernew new critical 2 weeks
#1411 About using HepMC file created by EvtGen in Delphes lixfrank new minor 4 weeks
#1412 Branches in Delphes Root File and Distinguishing Among Particles. usernew new major 4 weeks
#346 fixed A correction in a comment misho closed minor 4 weeks
#1260 Distinguising leptonic jets from hadronic jets JamesBPP8 new minor 4 weeks
#1409 fixed Error creating DelphesPythia8 executable ODupon closed minor 6 weeks
#1408 Installing new fastjet contrib and getting jet result in ROOT tree karkas new minor 7 weeks
#1384 fixed Track resolution in delphes_card_CMS.tcl jerdmann closed minor 8 weeks
#1407 Blank Delphes Card in MadAnalysis5 BFord new minor 2 months
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Last modified 21 months ago Last modified on 03/15/18 12:17:21