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Fix for low efficiency of tZq EFT samples

Baptiste Ravina requested to merge fix_tZq_EFT into master

Fix for the on-going production ATLMCPROD-10326 where the evgen jobs for 508985 are systematically failing. This is because a change in the underlying MG restriction card makes this t-channel single top process extremely inefficient. Here I add a few more restrictions (turning off unneeded EFT operators in the MG generate-line) to bring the efficiency back to 100%.

I've tested the modified JO locally, the results are available under /afs/cern.ch/work/r/ravinab/public/new_EFT_tZq/test.

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