Institute of
Nuclear Physics "Demokritos"
Bergische
Universitat Wuppertal Theoretical
Physics CERN RWTH
Aachen University
HELAC-DIPOLES
Helac-Dipoles
HELAC-DIPOLES
includes the
massless dipole formalism of Catani
and Seymour, as well as its massive
version as developed by Catani,
Dittmaier, Seymour and Trocsanyi, for
arbitrary helicity eigenstates of the external
partons. Phase
space integration of subtracted real radiation and
integrated dipoles in both massless and massive
cases is implemented and performed with the help of
Monte Carlo
generators PHEGAS and
KALEU. A phase space
restriction on the contribution of the dipoles is
also added.
The HELAC-DIPOLES package has been extended with the implementation of a new subtraction formalism, first introduced by Nagy and Soper in the formulation of an improved parton shower. A semi-numerical approach for the evaluation of the integrated subtraction terms for both massless and massive partons has been implemented, which provides the missing ingredient for a complete implementation. The new scheme can now be used for processes with arbitrary parton masses and multiplicities. Random polarization and color sampling of the external partons is also included.
The HELAC-DIPOLES package has been extended with the implementation of a new subtraction formalism, first introduced by Nagy and Soper in the formulation of an improved parton shower. A semi-numerical approach for the evaluation of the integrated subtraction terms for both massless and massive partons has been implemented, which provides the missing ingredient for a complete implementation. The new scheme can now be used for processes with arbitrary parton masses and multiplicities. Random polarization and color sampling of the external partons is also included.
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People
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Compilers:
gfortran g95 lahey 95
Intel
Fortran:: top ::
Software Download
DIPOLES 2.2.1 (8 October
2014): helac-dipoles-2.2.1.tgz Preconfigured version (HELAC-PHEGAS+DIPOLES)
README with installation and usage instructions included
KALEU phase-space generator incorporated into the HELAC-DIPOLES package
DIPOLES 2.1.1 (11 February 2014): helac-dipoles-2.1.1.tgz
DIPOLES 2.1.0 (16 December 2013): helac-dipoles-2.1.0.tgz
DIPOLES 2.0.0 (26 August 2013): helac-dipoles-2.0.0.tgz
DIPOLES 1.1.1 (16 October 2011): dipoles.1.1.1.tgz
DIPOLES 1.1.0 (27 July 2009): dipoles.tgz
the README file contains installation and usage instructions
HELAC-PHEGAS + DIPOLES: preconfigured.tgz
Preconfigured version to reproduce the results from the paper
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References
The following paper should be cited while using HELAC-DIPOLES package
Polarizing the Dipoles
M. Czakon, C. G. Papadopoulos and M. Worek
JHEP 0908 (2009) 085
Complete Nagy-Soper subtraction for next-to-leading order calculations in QCD
G. Bevilacqua, M. Czakon, M. Kubocz and M. Worek
JHEP 1310 (2013) 204
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News & Developments
Changes in HELAC-DIPOLES Version
2.2.1
A few bugs have been fixed
(e.g. for the problem found in the integrated
dipoles part of Nagy-Soper implementation in case of
ud -> tb
process)
A few minor bugs have been cured. README with installation and usage
instructions includedChanges in HELAC-DIPOLES Version 2.1.0
KALEU phase
space generator incorporated into the HELAC-DIPOLES
package (to compile "make kaleu")
A bug for the
.sumtype.eq.0 option fixed (fast sum option)
README with installation and
usage instructions included in the dipole
directoryChanges in HELAC-DIPOLES Version 2.0.0
New Nagy-Soper subtraction scheme for both massless and
massive partons
Dynamical factorization and renormalization scales Three
different jet algorithms (kT, anti-kT, Cambridge/Aachen)
Random color sampling
Random polarization sampling for Nagy-Soper scheme
Interface to the LHAPDF library
Interface to the KALEU phase space generator, which
associates separate channel
for each term in the real-subtracted integral
Deterministic Gaussian integration in the KP-operator
part of the integrated
dipoles replaced with Monte Carlo integration
Summation over PDFs for the subtracted real emission
part and I-operator Changes in HELAC-DIPOLES Version 1.1.1
Makefile modification
(to be run with HELAC-PHEGAS Curent Version 1.2.2) Changes in HELAC-DIPOLES Version 1.1.0
Integrated dipoles implemented for massless and massive
cases Phase space restriction
dependence included in the massless and massive cases A bug in the jet function fixed Phase space integrator corrected:: top ::
Contact us
If you have a question, comment, suggestion or bug report, please e-mail us at:
Costas.Papadopoulos(at)cern.ch
Malgorzata.Worek(at)cern.ch
mczakon(at)physik.rwth-aachen.de
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Last modified by Malgorzata Worek
Wed, Oct 8th, 2014