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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 620)

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Ticket Resolution Summary Reporter Status Priority Modified
#1346 GenWeights in Delphes alkaloge new major 8 days
#1345 Error while running delphesSTDHEP sayan new minor 9 days
#1344 LHCb delphes card amariot new major 9 days
#1343 Error in running Delphes Rojalin new minor 11 days
#1342 Regarding Particle-Flow and Jet Formation from Displaced Vertices samuel_alipourfard new minor 13 days
#1341 electron eta distribution between gen-level and reconstruction-level. ashiao0425 new minor 2 weeks
#1340 Error in <TList: Clear> while running ExternalFastJet examples huiluo new minor 3 weeks
#1339 B tagging efficiencies are independent? localname new major 3 weeks
#1338 Realistic delphes card for the current ATLAS/CMS performance satoshi new minor 4 weeks
#1337 How to do matching of a jet with parton level snandan new minor 4 weeks
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Last modified 7 months ago Last modified on Mar 15, 2018 12:17:21 PM