Why not Bayes?

• Want to report on the compatibility of the results of this experiment with the background or new physics before combining with prior.

• Empirically saw coverage problems worse than CLs.

  • Can do a frequentist-motivated "calibration" but...
    • Why not use the optimal Neyman-Pearson test (LR)?
    • Non-factorizable test-statistic eliminates possibility of CPU-saving techniques in pdf determination.

• Empirical study showed worse performance, as expected from N-P. for anything other than simple event counting in the absence of prior-tuning.