Thanks for your interest in DIRE (short for dipole resummation), a
program for all-order radiative corrections to scattering processes in high-energy
particle collisions. DIRE is available as plugin to the
General Purpose Monte Carlo Event Generator. If you have stumbled onto this
page by accident, here are pictures of
The DIRE parton shower combines dipole-shower ideas in the spirit of
with the careful handling of collinear enhancements in classical parton showers. As such, it is
a full-fledged replacement of the PYTHIA8 parton showers for lepton-lepton, lepton-hadron
and hadron-hadron collisions, including a detailed treatment of mass effects.
DIRE is automatically interleaved with PYTHIA's multiple interaction model. Furthermore,
PYTHIA can use DIRE in its internal merging machinery to produce
results at leading order, or
NL3 or UNLOPS merged
merged results at next-to-leading order.
The implementation of DIRE has been thoroughly checked against an independent implementation
event generator. The SHERPA implemetation is part of generator code for versions
greater than 2.2.0.
The DIRE physics publication is
or HERE. Please cite
this article (and of course the
reference) if you use PYTHIA8+DIRE for your research. Recent talks about DIRE
can be found
For installation instructions and code documentation, please consult the corresponding items in the
The latest version of DIRE is 2.000, published on May 2nd 2017. This version is compatible with PYTHIA versions 8.226 or higher.
The code now allows for NLO corrections to the parton shower evolution, for lepton-lepton, lepton-hadron or hadron-hadron collisions.
If you use these NLO functionalities, please cite
You can download the most recent DIRE plugin for PYTHIA8 HERE or
select a version from the downloads option in the left-hand menu.
Authors and Contact
DIRE has been developed by Stefan Höche and Stefan Prestel.
For questions about the PYTHIA8 plugin code, please contact direforpythia*AT*projects*DOT*hepforge*DOT*org