Adding New Quantities to the Artus Output (LambdaNtupleConsumer) - KIT-CMS/Artus GitHub Wiki
Create an entry for the new quantity in the consumer file, e.g. KappaAnalysis/interface/Consumers/KappaLambdaNtupleConsumer.h
The new quantity can only be calculated from the members of the event or the product. If you want to e.g. store some value which is only temporarily available in a producer, you have to pass this value to the consumer via a new product member (in KappaAnalysis/interface/KappaProduct.h).
Do not forget to add the new quantity to the list of quantities in your config (JSON-file).