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RCT Calibration Status

RCT Calibration Status. Lindsey Gray. Previous Findings. Sucessfully fit ECAL TPG sum mean as a function of Et to a quadratic. HCAL TPG sums were scaled by some factor, causing much confusion. Found TPG(GenEt) instead of GenEt(TPG). For now, calibrating the wrong way yields better results.

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RCT Calibration Status

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  1. RCT Calibration Status Lindsey Gray

  2. Previous Findings • Sucessfully fit ECAL TPG sum mean as a function of Et to a quadratic. • HCAL TPG sums were scaled by some factor, causing much confusion. • Found TPG(GenEt) instead of GenEt(TPG). • For now, calibrating the wrong way yields better results.

  3. Current Progress • Found fitting parameters for a cubic polynomial which characterizes Generator Et as a function of H+E TPG sums in an area of .5 Delta R. • Ecal energies calibrated first, then Ecorrected + H sum is calibrated. • F(x) = Ax3+Bx2+Cx • For finding TPG Sums as a function of GenEt, a quadratic polynomial was used. • To get corrected TPG sum (corresponding Gen ET value) I solved the quadratic and took the non-negative root. • F(x) = Ax2+Bx

  4. Results for cubic fit of GenEt(TPG_sum),Photon + Pion Problem with fit!!!

  5. TPG Sum Distributions in problem Et range. Double Peaked

  6. Example of Ecal Fitting Parameters • This information will be used in an RCT lookup table. • Row corresponds to Eta Bin. Which is currently segmented into Regions. • Also, implies an Et dependence for the problem on the previous slide.

  7. Comparison to Uncalibrated Photon + Pion RCT Output

  8. Problematic Et Slices, Uncalibrated Double peaked here as well! However, peaks are inverted?

  9. Improper Calibration Technique • I found the parameters for the function: • TPGSum = Ax^2 + Bx • This gives TPG_Corrected = A’ + B’sqrt(TPGSum) • Doesn’t vanish for TPG Sum = 0 • Found using same algorithm as proper method. • Quadratic instead of cubic polynomial. • Somehow, this gives a better result in terms of Et resolution and the means of Et resolution curves have less Et dependence.

  10. Results for improper calibration technique.

  11. Problematic Et Slices, again So calibrating with an improper technique gives a resolution Et dependence that we expect. Also, no Et dependence of resolution mean!

  12. Next Steps • Figure out why the calibration failed for large Et. • Generate LUTs for the RCT based on calibration data. • Validate LUTs using QCD samples.

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