Include B/Bbar dependence of the shower weight in the on-the-fly variations
Note that the difference is (fortunately) beyond the NLO accuracy of the method. However, it should be implemented for completeness, and it even appears to make a sizable difference in some cases.
This variation is missing in rel-2-2-5
and on master
. On rel-2-2-5
the B/Bbar factor can be enabled/disabled using the CSS_USE_BBW
setting. This setting is only read but never used on master
, so this should also be cleaned up with the new implementation.