(r8) SWGuideParticleDataTable < CMSPublic

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---+!! Particle Data Table
%COMPLETE3%

%TOC{title="Contents:"}%

---++ About the Particle Data Table in CMSSW

Short description of the Particle Data Table (PDT) in CMSSW and how to use them.

We are using the !HepPDT package for creating/using the Particle Data Table.

---++  What is available?

There are two Particle Data Tables available in CMSSW: 

   * one based on the particles in Pythia : it includes hypothetic particles such as Higgs bosons and supersymmetric particles
 
and 

   * one based on the PDG booklet : it only contains experimentally observed particles, but it also contains the errors on the measurements.
It is advised to use the Pythia table (for consistency with the generated particle properties).
THIS PDG TABLE WILL DISAPPEAR SOON (in 1_4_0) to have 1 consistent table througout our software !!!!!

---++  Using the Particle Data Table in CMSSW

   * In your .cfg files, include the following line:
<pre>  include "SimGeneral/HepPDTESSource/data/pythiapdt.cfi" </pre>                                                                              
   * In your code, you can access the particle data table as follows:
                                                                                
 <pre>   // getting the table from the EventSource es and filling it into pdt
ESHandle < ParticleDataTable > pdt;
es.getData( pdt );
 </pre>                                                                               
                                                                                
* to see what you can do with the table, you can have a look at the
header files in:
                                                                                
http://clhep.cvs.cern.ch:8180/cgi-bin/clhep.cgi/CLHEP/HepPDT/HepPDT/

Some examples:
<pre>
const DefaultConfig::ParticleData * part = pdt->particle( "mu-");     // get the muon data
cout << " Particle properties of the " <<  part->name() << " are:" << endl;  
cout << " Particle ID = " <<  part->pid() <<  endl;  
cout << " Charge = " <<  part->charge() << endl;  
cout << " Mass = " <<  part->mass() << endl;
</pre>

* an example of an EDAnalyzer ("HepPDTAnalyzer") that prints out some particle properties can be found in


 [[http://cmssw.cvs.cern.ch/cgi-bin/cmssw.cgi/CMSSW/SimGeneral/HepPDTESSource/test/?cvsroot=CMSSW][CMSSW/SimGeneral/HepPDTESSource/test]]


* for questions or problems, please contact [[mailto:Filip.Moortgat@cern.ch][Filip Moortgat]] and [[mailto:Luca.Lista@cern.ch][Luca Lista]]

#ReviewStatus
---++!! Review Status

| *Editor/Reviewer and date* | *Comments* |
| Main.fmoortga - 18 Jul 2006 | Page author (Filip Moortgat) |

%RESPONSIBLE% Main.fmoortga %BR%
%REVIEW% Reviewer

Topic revision: r8 - 2008-07-01 - LucaLista

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