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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 497)

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Ticket Resolution Summary Reporter Status Priority Modified
#1089 fixed B-tagging efficiency Dibyashree closed major 25 hours
#1116 fixed compilation error gigi closed minor 25 hours
#1114 fixed Compilation Error hang6318179 closed minor 30 hours
#1090 fixed Trouble with event display haggerty closed minor 33 hours
#1084 Bug affecting long-lived hadrons amonte new minor 33 hours
#1112 fixed How to set pi0 Particle Gun with Pythia8 within Delphes? miguelignacio closed minor 33 hours
#1115 photon kinematics shift ashiao0425 new minor 40 hours
#1113 Smearing of eta/phi in ATLAS card kmcg new minor 2 days
#1086 About ATLAS card amit new major 5 weeks
#1088 Converting Jet into leptons and charge misidentification of leptons arindamdas new minor 5 weeks
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