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Simulation in LHCb

This page is intended to hold fast evolving information on the simulation and to allow contributions by all. More information is available from the Gauss official web site that is cross referenced to this site.

Some topics in these pages may be not up to date, in which case they are indicated with Warning, important (May-Be-)Not-Up-To-Date. If you find something is no longer up to date, please tag it as such.

Topic being worked on are indicated with Work in progress, under construction In-Work.


Gauss is the LHCb Simulation software, built on the Gaudi Framework.
It consist of a first phase where the events are generated (e.g. pp collisions at 14 TeV) and a second phase where the particles are propagated trough the LHCb detectors.


The Gauss integration and release manager is Gloria Corti. The list of topics and coordinators/contacts is here.

Gauss Web

The main Gauss web page containing release information and links to user guides and tutorials, is here.


Current and future developments

Bugs and features

To report new bugs or unexpected feature use the "LHCb Physics software" savannah portal and select "Simulation" as category.

You can also check the list of already known bugs and their status.

Future releases

The current sets are under active development and support:

Deadline for contributions Project/Package Version Details Group Release
6 Sep 2012 - Work in progress, under construction DecFiles v25r14 Definition of new event types for MC11a MC11a 10 Sep 2012
20 Sep 2012 - DecFiles v25r15 Definition of new event types for MC11a MC11a 24 Sep 2012
29 Aug 2012 - Work in progress, under construction Gauss v42r2 Based on LHCb v35r1p1/Gaudi v23r3, for 2012 early simulation, fixes issues with Herwig++, introuced LbAlpGen and Rivet, Support for GDML, improvement of Gauss configurable and support for upgrade 2012 31 Aug 2012
29 Aug 2012 - Work in progress, under construction Gauss v43r0 New version of EvtGen v13r0 with interface to tauola++, photos++ and pythia8 DEV 10 Sep 2012
20 Aug 2012 - Work in progress, under construction Geant4 v95r1 Build of G4 9.5.p01 with dependency on LCG and not Gaudi DEV 27 Aug 2012
25 Aug 2012 - Work in progress, under construction Boole v25r1 Based on LHCb v35r2/Gaudi v23r3 2012 28 Aug 2012
30 Aug 2012 - Work in progress, under construction Gauss v44r0 Use new version of Geant4 v95r1, based on LHCb v35r2/Gaudi v23r3 DEV 10 Aug 2012
end Aug 2012 DecFiles v26r0 Support of LHCb PartProp with Gauss v42r1 and higher. Changes in DECAY.DEC 2012 Sep 2012
mid Sep 2012 DecFiles v27r0 With new format in decay files for tests with Gauss v43r0 and higher. DEV Sep 2012

See the LHCb Tag Collector for details, status and deadline for contributions for future versions.

Instructions to Gauss Managers to prepare releases

-- Last Update: GloriaCorti - 16-Mar-2012

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Topic revision: r85 - 2012-08-23 - GloriaCorti
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