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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 607)

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Ticket Resolution Summary Reporter Status Priority Modified
#1333 Is P_T of electrons smeared by calorimeter, or is it all in tracker? malbergo new minor 15 hours
#1332 Delphes does not store the correct weight Abdualazem new minor 39 hours
#1331 Add variables to Class Jet using DelphesPythia8 alefisico new minor 7 days
#1330 where is fConfReader defined ? Haqiqat new minor 7 days
#1329 fixed How to maintain the LHE event weight when going through Delphes? roberto.franceschini closed major 8 days
#1328 How to prevent certain particles from participating in jet clustering ? Haqiqat new critical 10 days
#1327 Jet.FlavorAlgo and Jet.FlavorPhys always returns 0 taufiqmurtadho new minor 13 days
#1326 Question on btagging working points alkaloge new major 2 weeks
#1325 Understanding PT/Energy resolution formula in Delphes Card malbergo new minor 2 weeks
#1320 Implementing FatJet Btagging alemicheli new minor 3 weeks
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Last modified 5 months ago Last modified on Mar 15, 2018 12:17:21 PM