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 (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 In-Work.

Introduction

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.

Coordinators

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.

Documentation

• Gauss FAQ
• Gauss and DecFiles Tutorials for self-teaching
• Information on Generators in Gauss, In-Work
  A collection of information related to the generator part of Gauss: links, talks, notes. More information available from the Gauss web page.
  
• Information on Detector simulation (Gauss and Boole), May-Be-Not-Up-To-Date
  A collection of notes, talks and links related to the description of the status of the simulation and digitization for the different subdetectors.
• Simulation Conditions used in productions and for which data are available with some explanation In-Work
• Meetings, Presentation and Workshops
• Publications

Current and future developments

• Simulation Draft Board for development contributions.
  Recipes, scripts and code to share. This may be make available to be centrally release once tested.
• Simulation Validation (and tuning).
  List of samples for validation, reference distributions from Physics Working Group, tools to help in validation.
• List of Simulation Tasks, the evolution of some of those being worked on can be followed on the Savannah task list (Simulation category).
  The old list on twiki is being migrated there.
  Detailed descriptions and documentation for specific topics are linked from the savannah task and are also linked from the old list on twiki that will become just a list of supporting documentation.
• Simulation for Upgrade

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
07 Dec 2012 -	Geant4	v95r2p1	Build of G4 9.5.p02 with dependency on LCG and not Gaudi	DEV	10 Dec 2012
16 Nov 2012 -	Geant4	v95r2	Build of G4 9.5.p02	DEV	19 Nov 2012
16 Nov 2012 -	Gauss	v43r2	Use new version of Geant4 v95r1, based on LHCb v35r2/Gaudi v23r3, new version of pythia6, lhapdf	DEV	19 Nov 2012
19 Nov 2012 -	Gauss	v44r2	New version of EvtGen v13r0 with interface to tauola++, photos++ and pythia8	DEV	21 Nov 2012
24 Nov 2012 -	DecFiles	v25r19	Definition of new event types for MC11a	MC11a	26 Nov 2012
24 Nov 2012 -	DecFiles	v26r19	Definition of new event types for MC-2012	2012	26 Nov 2012
24 Nov 2012 -	Boole	v26r0	Based on LHCb v35r2/Gaudi v23r4, with support for upgrade	DEV	26 Nov 2012
end Nov 2012	DecFiles	v27r0	With new format in decay files for tests with Gauss > v44r2	DEV	end Nov 2012

Preview as available in the nightly builds can be found here

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

Instructions to Gauss Managers to prepare releases

• Geant4 releases
• Gauss releases
• DecFiles releases

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