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Analysis Meeting for BΛ Event Generation: Systematic Errors and Tuning Conditions

This meeting on 7th February 2014 focused on blind analysis, systematic errors, and tuning conditions for generating BΛ events. Topics included matrix tuning, detector resolutions, energy losses, acceptance criteria, and fitting results. The discussion covered distorted data, event selection, and backgrounds to ensure realistic distributions. Various differential non-linearities were examined before and after tuning the matrices. Overall, the meeting evaluated the systematic error at 100 keV from the tuning process, with a focus on event simulations and missing mass distributions.

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Analysis Meeting for BΛ Event Generation: Systematic Errors and Tuning Conditions

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  1. HES-HKS analysis meeting 7Feb2014 ToshiGogami

  2. Contents Blind analysis • Systematic error for BΛ

  3. Event generation HES Imitation data POSI Coincidence • background HKS • Matrices • Detector resolutions • Beam Energy loss • Raster • e’, K+ energy losses • Acceptance

  4. Event generation Distorted HES Imitation data POSI Coincidence • background HKS • Matrices • Detector resolutions • Beam Energy loss • Raster • e’, K+ energy losses • Acceptance

  5. Missing mass spectra with (distorted) initial matrices

  6. Tuning conditions • Event selection • Λ, Σ0 : ± 1σ • 12ΛB g.s. : ± 2σ • Backgrounds • Λ, Σ0 : Realistic distributions and S/N • 12ΛB g.s. : Uniform distribution and realistic S/N • Tuning (five iterations a loop)

  7. Before and after matrix tuning SIMULATION SIMULATION With Initial matrices With tuned matrices

  8. Results (fitting meanand width) FWHM ΔMean (M - Mgen) Λ, Σ0 : ~1500 keV 7ΛHe: ~1000 keV Others: 500 – 750 keV ± 100 keV

  9. Differential non-linearity Before tuning 12 SIMULATION ΔMHYP (M - Mgen) After tuning

  10. Differential non-linearity 12ΛB Missing mass [GeV/c2]

  11. Differential non-linearity 7ΛHe 52ΛV 12ΛB Missing mass [GeV/c2]

  12. Differential non-linearity 7ΛHe 12ΛB 52ΛV

  13. Differential non-linearity ΔBΛ100 keV 7ΛHe 12ΛB 52ΛV

  14. Summary Blind analysis • Systematic error 100 keV (from tuning code)

  15. Backup

  16. Number of events after matrix tuning うまく数勘定ができる！

  17. Voigt function

  18. Λ, Σ0

  19. Missing mass distribution without target 7ΛHe Missing mass [GeV] Missing mass [GeV] Target z [cm]

  20. Missing mass distribution without target δpK [GeV] δpe’ [GeV] Target z [cm] Target z [cm] Z-dep HES 起因

  21. Missing mass distribution without target Δx’e’ [GeV] Δx’e’ [GeV] Target z [cm] Missing mass [GeV]

  22. H2O target

  23. Hall-Aの結果と比較

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