the AcerMC version 3.8 is released.
New ATLAS defaults are added as the running options.
the AcerMC version 3.7 is released.
An improvement for top pair processes is made because due to numerical
accuracy the branching ratios in top pair decays were off by a few
percent when using the non-full-hadronic branching mode (ACSET13=6)
which is now corrected.
the AcerMC version 3.6 is released.
A bug fix for top pair processes is made because the angular
distributions in W+ decays for quark initial state (process 12) were
reversed. The bug was introduced in AcerMC 3.2.
the AcerMC version 3.5 is released.
The processes 26 is added, describing massive PS+ME procedure in the
case of g g -> Z b
b~ production. The process 27 combines this one with process 6. There
are new switches ACSET(60-61) which set the polarisation in hadronic
and leptonic top pair decays as described in the manual and acermc.card.
the AcerMC version 3.4 is released.
The processes 24 and 25 combining the processes 24=5+6 and 25=7+8 were added for convenience.
the AcerMC version 3.3 is released.
A bugfix for process 18 (wrong subprocesses called when selecting it) and general code cleanup.
A bugfix (thanks to Jean-Baptiste Devivie) in
the AcerMC version 3.2 . The issue was that
in Wbb and Wtt processes 3 and 4 the W charge was reversed by a modification in code
introduced in the 3.x versions. The source tarball for 3.2 has been replaced. No other processes
The AcerMC version 3.2 is released.
There are several new options for top pair decays and Z-prime models. Also,
a typo in the manual which listed the tttt cross-sections as an order of
magnitude (factor 10) too big was corrected. Please consult the manual for details.
The AcerMC version 3.1 is released.There are several new processes (single top production, associated Z b production, Z-prime production etc. as well as the new for (ISR) parton shower and matrix element matching procedure for the processes involving a b-quark in the initial state. Please consult the manual for details.
The AcerMC version 2.4 is released. This version
implements the LHAPDF/LHAGLUE interface which replaces the obsolete PDFLIB804 libraries.
The AcerMC version 2.3 is released. This version
contains a new ACSET(13)=17 setting which enables one to produce final states in processes 11-14 where both bosons decay leptonically to either electron or muon (+ neutrinos).
The AcerMC version 2.2 is released. This version
contains a simple bug fix related to the charge of the reconstructed W bosons in the history of processes 11-14; there used
to be a charge assignment error in about 2 percent of cases, the bug was in event history only, the final state was correct.
Thanks to Jean-Baptiste Devivie and Pascal Pralavorio for pointing this out.
The AcerMC version 2.1 is released. This version
contains the new interface to ARIADNE 4.12, the use is analogous to running PYTHIA/HERWIG (just type 'make run_ar'). The latest PYTHIA 6.224 and HERWIG 6.505 versions have been included. For details please consult the updated manual and the provided INSTALL file.
The AcerMC version 2.0 is released. This version
contains a completely re-done phase space sampling algorithms which now provide 6 and more
particles in the final state. Several new processess have been implemented at user requests.
Please consult the updated manual for details.
The hwmodk.f file in the AcerMC version
1.4 distribution got corrupted during the tar process; the
distribution is now replaced with an uncorrupted file. The
PYTHIA interface was not affected.
We thank Z. Was for pointing this out and apologise for possible inconvenience.
The AcerMC version 1.4 is released.
The interfaces to external TAUOLA and
libraries were added. The necessary modifications in the interface routines and the
native PHOTOS code were made to
enable the user to process the events with TAUOLA
using PYTHIA or
HERWIG as the supervising generators.
The interfaces to external TAUOLA and
The AcerMC version 1.3 is released.
A transition to the HERWIG 6.5 was made, which now
supports the Les Houches standard for handling the external processes. Consequently,
the AcerMC interface to HERWIG 6.5
was completely rewritten. As a direct consequence, the same event record can freely be
swapped (i.e. read back) to either PYTHIA or
HERWIG for fragmentation and
hadronisation treatment. In addition, the PYTHIA version was upgraded to
PYTHIA 6.214. Furthermore, the build procedure of the libraries and executables was
greatly simplified. For details please consult the updated manual and the provided INSTALL
The AcerMC version 1.2 is released. The changes include
a bug fix in HERWIG 6.4, transition to
PYTHIA 6.208 and the implementation of
storing/reading back of hard process events according to the
Les Hauches standard (the implementation is simplified with respect to version 1.1).
For details please consult the updated manual and the provided INSTALL
The AcerMC version 1.1 is released. The changes include
transition to HERWIG 6.4, updated scale choices for processes
5-8, inclusion of control processes 91-94
for consistent evaluations and a possibility of an event dump according
to the Les Hauches standard. For details please consult the updated manual and the provided INSTALL
The AcerMC writeup was updated according to suggestions given by the CPC referee. Also, in the
code a bug-fix was made: AcerMC incorrectly
copied the CKM matrix from the Pythia/Herwig interface,
resulting in the total cross-sections for processes 3 and
4 being about 10% too low (kinematic distributions of events were
not affected); this is nevertheless still well within the theoretical uncertaintly on the values.
Please consult the updated writeup for new numbers.
For additional information about AcerMC capabilities, the transparencies of the talk given at
the CERN Theory Division seminar on particle physics phenomenology on 1.3.2002
are given here .
First release, version 1.0. The code has been thoroughly checked but please still consider the
release to be to some extent ' beta ', some bugs are probably still there.
When in doubt you are incouraged to contact the authors.