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Summary

Summary. “Bugs found” MC samples generated in separate job are suspect ?? The PDF is  What do we use for “M” if we bin the fit? Average for bin (a bad choice, it seems) Integral over mass values in bin (seems to be best) Expected events in bin  Have to use small enough bins. Signal

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Summary

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  1. Summary • “Bugs found” • MC samples generated in separate job are suspect ?? • The PDF is  What do we use for “M” if we bin the fit? • Average for bin (a bad choice, it seems) • Integral over mass values in bin (seems to be best) • Expected events in bin  Have to use small enough bins. Signal PDF K-p+p+ mass Background PDF

  2. Summary • Can now fit MC samples • Learn there are large uncertainties in region where |P| is small • This is probably most of the range above ~1100 MeV/c2 (We fix P-wave up to ~930 MeV/c2) • Is a sample of ~1M events enough ?

  3. Further Steps • Try using a ~10M sample to see if the correct solution is then found. • Fake it with the Poisson fluctuation • Create ~10M event sample of Kappa toy MC. Actually only made 4.5M due to PAW problems • Try smaller bin-sizes • Checks integration over bins. 600x600 seems satisfactory • See if other Poisson fluctuations give randomized solutions in the region where the P-wave is poorly defined. • Make many fits with Poisson fluctuations.

  4. Fit 4.5M “MCC” sample(600 x 600 binning) Toy MC is generated from the “isobar model” fit (MCC).

  5. Fit 3M “MCC” sample(600 x 600 binning) Toy MC is generated from the “isobar model” fit (MCC).

  6. Fit ~1M “MCC” sample(600 x 600 binning) Toy MC is generated from the “isobar model” fit (MCC).

  7. Different Model ~1M “MCA” sample (600 x 600 binning) Toy MC is generated from the “isobar model” fit (MCA): S-wave: k, K0(1430) P-wave: K*(890), K1*(1410), K1*(1677) D-wave: K2*(1420)

  8. Different Model 4.5M “MCA” sample (600 x 600 binning) Toy MC is generated from the “isobar model” fit (MCA): S-wave: k, K0(1430) P-wave: K*(890), K1*(1410), K1*(1677) D-wave: K2*(1420)

  9. Systematic Shifts • Made 15 fits to 1.5M samples of toy MCA events • Must make many more trials

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