Kfactors

Another useful tool that pineko includes is pineko kfactor which allows the embedding of a kfactor as a proper order in a grid. The usage is the following:

pineko kfactor THEORY_ID DATASET KFACTOR_FOLDER TARGET_FOLDER PTO_TO_UPDATE [--order_exists]

where:

• THEORY_ID is the theory ID of the source grid,

• DATASET is the dataset name,

• KFACTOR_FOLDER is the folder containing the kfactor files,

• TARGET_FOLDER is the folder where the new updated grids is going to be saved,

• PTO_TO_UPDATE is the \(\alpha_s\) perturbative order to update or create, with the convention that LO=1, NLO=2 and so on, irrespectively to the powers of \(\alpha_s\). Note also that this differs from the conventions by the NNPDF collaboration, but it is consistent with the pineappl convention.

• --order_exists is a flag used to apply the kfactor to the specified perturbative order, insead of the next.

Note that only pure QCD kfactors are taken into account. For example to add the NNLO in a grid containing at most NLO one has to select PTO_TO_UPDATE=2; nn the other hand to reweight the NNLO present in a grid with a kfactor, one should do PTO_TO_UPDATE=2 --order_exists.