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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 468)

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Ticket Resolution Summary Reporter Status Priority Modified
#1066 Problems / Feedback: Event Display stamm new minor 3 days
#1059 TrimmedP4 and pyroot amonte new minor 2 weeks
#1065 Question regarding jet constituents and jet trimming (ATLAS card) wfedorko new minor 2 weeks
#1064 Regarding "IsolationInputArray" used in the Delphes card subhparasara new major 4 weeks
#1062 error: Failed to access python version of LHAPDF adil new minor 5 weeks
#1039 No interpreter information for classes apdf new minor 5 weeks
#1061 Distribution of transvere W boson mass not modelled correctly by Delphes 3.4.0 stamm new minor 5 weeks
#1060 Question regarding tau tagging in in leptonic channel sphys new major 6 weeks
#1057 fixed Incomplete tag_1_delphes_events.lhco file adil closed minor 8 weeks
#852 new invisible particle implementation J Dutta new critical 2 months
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