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For the DecayDescriptor in CombineParticles in DaVinci, you need to know the name of the particles which can be used. This list can be dumped the following way on lxplus:
Dump Text File
SetupLHCb dump_db_to_files.py -c sqlite_file:$SQLITEDBPATH/DDDB.db/DDDB -s /param/ParticleTable.txt
which will dump the file in the folder 'DDDB/param'. You can change the folder the file is dumped to with the -d option.
Alternatively you can get the table printed with:
SetupDaVinci dump_particle_properties
Use CondDBBrowser
Alternatively, you can also use the CondDBBrowser. Type:
CondDBBrowser
and then go to 'Database → Standard →DDDB' and look for 'param/ParticleTable.txt'
The syntax of the DecayDescriptor is described in the DecayFinder (!) class reference of DaVinci.