NNLOJET

NNLOJET is a multipurpose parton-level Monte Carlo generator which can compute several different process at NNLO in QCD using the antenna subtraction method. While at the moment the code is private, pinefarm provides an interface to autogenerate pinecards from NNPDF datasets and NNLOJET runcards from pinefarm pinecards.

The installation of NNLOJET is not automatized by pinefarm as it won’t be run by pinefarm which will only prepare the runcards. Please follow the installation instructions.

Generating a pinecard

Pinecards for NNLOJET are a declarative .yaml representation of NNLOJET .run runcards. These can be mostly autogenerated using the autogen command

pinefarm autogen <dataset name>

Where dataset name is one of the datasets from NNPDF, e.g., LHCB_Z0_8TEV_MUON_Y. This will generate a new folder with a template in the paths::pinecards folder (as defined in the pinefarm.toml file), named NNLOJET_<dataset name>.

This folder contains two files, a .yaml file, which defines the run, and a metadata.txt file which pinefarm will use to add extra key-value pairs to the final grids.

Running with NNLOJET

The most common use-case of NNLOJET is the generation of NNLO grids, for which running in a cluster is necessary. Job management is beyond the scope of pinefarm and users are discouraged to run NNLOJET manually. Instead, the official workflow must be used as described in the NNLOJET documentation

In order to obtain a NNLOJET runcard that can be used together with the workflof, use:

pinefarm run <pinecard name> <theory>

Where theory must be a yaml file defining the parameters of the theory, e.g., this one. This last will create a folder in the paths::results folder named <theory ID>_<dataset>_<timestamp>.

In most cases (and all for which a postrun.sh is provided) it will be necessary to run the finalize step after the NNLOJET calculation has finished. For that add the --finalize flag, pointing to the appropriate run folder.

pinefarm run <pinecard name> <theory> --finalize <runfolder>