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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
15 Jul 2012 - DONE DecFiles v25r12 Definition of new event types for MC11a MC11a 19 Jul 2012
29 Jul 2012 - Work in progress, under construction DecFiles v25r13 Definition of new event types for MC11a MC11a 30 Jul 2012
12 Jul 2012 - DONE Gauss v41r4 New models in EvtGenExtras and new cuts for MC11a MC11a 17 Jul 2012
22 Jul 2012 - Checked checkbox, round Gauss v42r1 Simulation for 2012 April-June data based on LHCb v35r0/Gaudi v23r2 but same physics as MC11a, fixes iusses with Pythia8, introduce AlpGen, support of Upgrade database, move to LHCb Part Prop, infrastructure for GDML 2012 25 Jul 2012
18 Jun 2012 - DONE Geant4 v94r2p4 Build of version 9.4.p02 with Gaudi v23r3, add GDML 2012 24 Jul 2012
25 Jul 2012 - Work in progress, under construction Gauss v42r2 Based on LHCb v35r0/Gaudi v23r3, for 2012 early simulation, fixes issues with Herwig++, introduce RIvet, Support for GDML, improvement of Gauss configurable for upgrade 2012 26 Jul 2012
25 Jul 2012 - Work in progress, under construction Gauss v43r0 New version of EvtGen v13r0 with interface to tauola++, photos++ and pythia8 DEV 27 Jul 2012
7 Jul 2012 - DONE Boole v25r0 Based on LHCb v35r0/Gaudi v23r3 2012 9 Jul 2012
29 Jul 2012 - Work in progress, under construction Geant4 v95r1 Build of G4 9.5.p01 with dependency on LCG and not Gaudi DEV Jul 2012
Jul 2012 - Work in progress, under construction Gauss v44r0 Use new version of Geant4 v95r1 DEV Aug 2012
Jul 2012 DecFiles v26r0 Support of LHCb PartProp with Gauss v42r1 and higher. Changes in DECAY.DEC 2012 Jul 2012
Aug 2012 DecFiles v27r0 With new format in decay files for tests with Gauss v43r0 and higher. DEV Aug 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: r83 - 2012-07-24 - GloriaCorti
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