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EmcCalPi0 study

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. Pi0 calibrations. polynomial in ln(E) + polynomial in cos(theta) + ln(E)cos(theta) term

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EmcCalPi0 study

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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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