Running on a subset of available multiweights

By default Rivet will run over all the available multiweights in can find in the input file. It might be beneficial to only run on a subset of the available multiweights, especially when the output file would be rather large and the weights aren’t actually needed. The following flags can help:

• passing the --skip-multiweights (or its alias--skip-weights) flag to Rivet will skip all multiweights apart from the nominal.
• the --match-weights flag can be used to select a subset of the weights, e.g. --match-weights=WeightName1,WeightName2, or using a suitable regular expressions, e.g. --match-weights=MUR.*MUF.*PDF123456. Note that the default weight can never be de-selected.
• the --unmatch-weights flag can be used to de-select a subset of the weights, e.g. --unmatch-weights=WeightName1,WeightName2, or using a suitable regular expressions, e.g. --unmatch-weights=MUR1_MUF1_PDF123.*. Note that the default weight can never be de-selected.
• Rivet will try to guess which weight should be treated as nominal if it is sensibly named, but you can explicitly tell it which weight to treat as the nominal by passing the name using the --nominal-weight flag.

When both flags are passed, --match-weights is evaluated first, and --unmatch-weights is applied to the “surviving weights”. Whenever --skip-multiweights is passed, it takes precedence (i.e. --match-weights and --unmatch-weights would be ignored in that case).