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EmcCalPi0 Study: Brief Comparison and Applications in Photon Energy Bins

This study presents a comparison between EmcCalPi0 and current pi0 calibration methods, with examples of EmcCalPi0 corrections. It explores the application of EmcCalPi0 to pi0 and eta in different gamma energy bins. Quality assurance is conducted by comparing pi0 mass variations versus run pi0 calibrations, utilizing polynomials in ln(E), cos(theta), and ln(E)cos(theta) terms. Enrico has 4 lnE coefficients, 2 cos(theta), 0 ln*cos terms, and the process is factorizable for extracting theta terms for EmcCalPi0. EmcCalPi0 is a rolling calibration that updates after 50k runs if changes are needed, focusing on adjusting the 0th, then 1st, and 2nd order correction terms, starting from 0 values. The study compares EmcCalPi0 correction vs. energy in runs 13k-14k-15k and includes examples of mass fits for photon energy bins and eta fits, while monitoring pi0 mass evolution with a focus on run 26k. Recommendations indicate that a working rolling calibration could enhance resolution but cautions against blind use of EmcCalPi0 without considering future settling time improvements, suggesting potential corrections based on E.M. or EmcCalPi0 results. Further investigations are recommended using available constants in reasonable regions to achieve more consistent results, with ongoing research in progress.

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EmcCalPi0 Study: Brief Comparison and Applications in Photon Energy Bins

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  1. EmcCalPi0 study • Brief comparison of EmcCalPi0 and current pi0 calibration methods • examples of EmcCalPi0 corrections • application to pi0 and eta in gamma energy bins • QA pi0 mass vs run

  2. Pi0 calibrations • polynomial in ln(E) + polynomial in cos(theta) + ln(E)cos(theta) term • Enrico has 4 lnE coefficients, 2 cos(theta), 0 ln*cos • factorizable -> can extract theta terms for EmcCalPi0 • EmcCalPi0 has 3 lnE coeffs, 0 cos, 0 ln*cos • EmcCalPi0 is a rolling calibration - updates after 50k if change needed • change 0th order term, then 1st , then 2nd • starts from 0,0,0 so correction needs settling time

  3. EmcCalPi0 correction vs E, run

  4. Runs 13k-14k-15k

  5. 4 calibrations in photon energy bins Enrico Run 14777 + theta Run 13082 Run 13082 + theta

  6. 4 calibrations in photon energy bins Enrico Run 14777 + theta Run 13082 Run 13082 + theta

  7. Example of mass fits (E_gamma<0.5)

  8. More photon energy bins

  9. Eta fits

  10. QA pi0 mass evolution

  11. Focus on 26k

  12. EmcCalPi0 for this range

  13. Last slide, projection

  14. Conclusions • A working rolling calibration would improve resolution • can't use EmcCalPi0 blindly (v. runs 13k-14k) • needs to settle faster in future - start from E.M. correction? or E.M. based on EmcCalPi0 results? • maybe can tack on theta dependence from E.M. • Can get non-crazy results using available constants in reasonable regions • More investigation to follow...

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