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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 573)

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Ticket Resolution Summary Reporter Status Priority Modified
#1298 Difference in eta, phi values before an after Delphes malbergo new major 5 days
#1161 fixed hepmc not read by Delphes amin83 closed minor 5 days
#1299 fixed Issue with hepmc from MadGraph + Pythia, qcut dependence jjonesperez closed minor 5 days
#1149 Delphes Reconstructing too few photons kmcg new minor 5 days
#1297 fixed Error: cannot open file "TLorentzVector.h" classes/DelphesClasses.h:38: trobens closed minor 5 days
#1296 Photon conversion Haolin new minor 3 weeks
#1295 from tcl (working in Delphes Standalone) to a card.dat for MadGraph roberto.franceschini new minor 4 weeks
#1118 ATLAS card does not use muons for MET sbaum new major 5 weeks
#1293 Lepton isolation and jets JamesBPP8 new minor 6 weeks
#1262 fixed Next version amit closed minor 6 weeks
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Last modified 9 days ago Last modified on Mar 15, 2018 12:17:21 PM