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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 657)

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Ticket Resolution Summary Reporter Status Priority Modified
#1383 fixed Help with installing Delphes hassan31 closed major 5 days
#1381 Installing Delphes Error : Both as Standalone and in MadGraph arindamdas new critical 5 days
#1382 Implement two isolation criterion simultaneously saiyad_a new major 9 days
#1380 Trouble propagating weight arrays amandeephy new minor 10 days
#1379 Parallel execution disipio new major 3 weeks
#1378 Duplicate Tracks in Jets samuel_alipourfard new major 3 weeks
#1377 Delphes 3.4.2 installation fails amin83 new minor 5 weeks
#1376 fixed Problems in creating .root file from .hepMC file by Delphes-3.4.1 nayakranjit closed major 5 weeks
#1375 Implement b-tag with external fastjet and write to root file. andrea.diluca new minor 6 weeks
#1374 invariant mass of high-pT hadronic-tau leptons arganda new major 6 weeks
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Last modified 15 months ago Last modified on 03/15/18 12:17:21