no error in LO cross section when using bias
I get slightly different cross sections when running with bias vs without. The process is p p > ta- vt~ (I don't think the specific process matters) and I get
with bias: 3578 ± 0
without bias: 3616 ± 6.9
While the difference is small, it is much larger than the errors. I am particularly concerned about the zero uncertainty in the run with bias. For completeness the bias is with
/ptl_bias = bias_module ! Bias type of bias, [None, ptj_bias, -custom_folder-]
{'ptl_
where the ptl_bias module is just the ptj_bias module with is_a_l for is_a_j
Incidentally the bias works: the histograms of pT of ta- (and that of MET) are very smooth at large pT (and MET) for the biased case, not so for the unbiased one (with a 10000 run).
The question is then: what happened to the error in the biased run? (I understand that the difference is less than the correction that would come from NLO, but still....)
Thanks
Ben
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