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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
10 May 2012 - Work in progress, under construction DecFiles v25r8 Definition of new event types for MC11a MC11a 11 May 2012
24 May 2012 DecFiles v25r9 Definition of new event types for MC11a MC11a 25 May 2012
7 Jun 2012 DecFiles v25r10 Definition of new event types for MC11a MC11a 8 Jun 2012
20 Apr 2012 - CLOSED Geant4 v94r2p3 Build of MC11a version with latest Gaudi 2012 11 May 2012
11 May 2012 - Work in progress, under construction Gauss v41r4 First version of simulation for 2012 ICHEP (compatible with DecFiles v25) based on new Gaudi/LHCb but same physics as MC11a 2012 14 May 2012
24 May 2012 - Work in progress, under construction Gauss v42r0 With new version of EvtGen DEV 28 May 2012
24 May 2012 DecFiles v26r0 With new format in decay files for tests with Gauss v42r0 and higher DEV 28 May 2012
24 May 2012 - Work in progress, under construction Geant4 v95r0 Build of G4 9.5 with dependency on LCG and not Gaudi DEV 28 May 2012
1 Jun 2012 Gauss v42r1 With new version of Geant4 DEV 4 Jun 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: r78 - 2012-05-09 - GloriaCorti
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