DaVinci Physics Analysis Application

Introduction

DaVinci is the LHCb Analysis software, built on the Gaudi Framework.

Coordinators

The DaVinci release manager is Eduardo Rodrigues. The list of packages and coordinators is here.

DaVinci Web

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

Documentation

FAQ

• See LHCb FAQ sub web
  • DaVinci FAQ
• Decay descriptor language documentation
• DaVinciConfigurable : Python options for text options users
• TupleToolsAndConfigurables : Quick-reference of how to use configurables, specifically to understand TupleTool configurations.

DaVinci Tutorial

There are many tutorials for self-teaching. They are also used at the various tutorial sessions. See DaVinciTutorial.

Reference Wiki pages and notes

• Stripping framework implementation based on Lines.
• Particle selection toolkit.
• LHCb stripping page.
• MicroDST writing and reading.
• Recommended data base tags
• Vertex fitters
• Flavour tagging
• Global particle ID
• PIDCalib package
• Particle to Monte Carlo truth association
• Particle to primary vertex association
• Primary vertex re-fitting
• Association of Particles and Primary Vertices and Switching between On- and Offline Contexts in DaVinci
• How to acess the Monte Carlo Truth information for the Recontructed Primary Vertices?
• Commonly used LoKi::Hybrid::Filters.
• Documentation related to TisTossing L0, Hlt1 and Hlt2 triggers
• Pileup Rescaling how to use the tools to resample/weight events to simulate different pileup conditions

Bug report

Please use the LHCb Savannah Portal under category "Analysis"

New developments

This is a list of some new and significant developments that haven't been presented or documented very much:

• DecayTreeFitter, by Wouter H.
  • "tool"-based preliminary version of thif fitter is available for tests from 26.May.2k+10, the corresponding LoKi/Bender functors will appear just after.
• Fixes to Selection "Framework" to allow using AutomaticData (or DataOnDemand) Selections to write Micro or selection DSTs (meaning these objects really behave like Selections now.)
• MultiSelectionSequence, SelectionSequence class with OR of SelectionSequences.
• Pure-python ntpule and 1D histogram. I haven't advertised it widely because I haven't finished the functions to represent these entities graphically.
• Use of Particle::Selection everywhere has been enabled (and set to default for FilterDesktop)
  • Unfortunately LHCb::Particle::Selection class has no Reflex dictionaries, and thus can't be used in Python now, see bug @66973
• More restricted scope for FilterDesktop (got rid of all the CloneTrees and similar options)
• Vanya's new Particle FilterInTrees algorithm, hasn't been presented anywhere but could be useful, specially for people using the weird obsoleted functions of FilterDesktop
• A bunch of useful GaudiPython stuff in AnalysisPython. Listing of DST contents. Histogram plotting (old stuff from Vanya, but not regularly used)
• Scripts to explore contents of DSTs in Phys/DSTWriterTests (uses the above)
• Vanya's python way of using the LHCbMath geometry stuff.
• "New" decay finders
• "mcMatch" functors for CombineParticles/FilterDesctop/TupleTool frameworks
• New functors CONTAINS, EXISTS, ... for "Void"-filters, that allows to fast event filtering based on some event characteristic.
• Event Tuple Tool : hybrid tuple-tool to deal with L0/HLT/ODIN and void-funtors
• ASCII representation of histograms (it is VERY convinient e.g. for log-files)
• New DaVinci particle filtering functions in DaVinciKernel
• New IParticleFilter interface. Examples of how to use with LoKi cuts? Probalby unnecessary, except for custom-made C++ particle-filtering algorithms.
• New algorithm FitDecayTrees to refit the decay trees using DecayTreeFitter::Fitter utiilty by wouter Hulsbergen

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-- Vanya Belyaev - 10-Jul-2k+10 -- Vanya Belyaev - 26-May-2010 -- Juan Palacios - 12 Jun 2009 -- Vanya BELYAEV - 17 May 2008 -- PatrickKoppenburg - 20 Jun 2008