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NC 98/99 Analysis

SFEW MEETING 5/6/2001. NC 98/99 Analysis. C. M. Cormack (RAL). Jason Breitweg, Ricardo Goncalo, Alexander Kappes, Amaya Lopez Duran-Viani, Matthias Moritz, Henning Schnurbusch. Hadronic Energy Response Study. Diffractive Method - Results Jets Method - Results Summary.

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NC 98/99 Analysis

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  1. SFEW MEETING 5/6/2001 NC 98/99Analysis C. M. Cormack (RAL) Jason Breitweg, Ricardo Goncalo, Alexander Kappes, Amaya Lopez Duran-Viani, Matthias Moritz, Henning Schnurbusch. Hadronic Energy Response Study Diffractive Method - Results Jets Method - Results Summary

  2. C. M. Cormack (RAL) NC98 xF3 Analysis 5/6/2001 Hadronic Energy Scale Uncertainty • Double Angle Method Sensitive to Angular Variations in the Energy Scale • Need to Calibrate each individual Calorimeter • Also Possible to calibrate the HAC and EMC • The 2 Methods Used • Diffractive Method • Allows the Direct Isolation of Hadronic Energy in Each Calorimeter Section. • Jets Method • Isolated Jets can be restricted to the BCAL • Large range in PT can be Covered • Calibrating the 2 Other Calorimeters not so simple

  3. max C. M. Cormack (RAL) NC98 xF3 Analysis 5/6/2001 Energy Scales Checks From Standard DIS • Typical properties of Standard DIS events • Event not well contained in central detectors • Large Energy loss in beam pipe • Strong dependence on beam pipe/FPC leakage • Almost Impossible to have complete hadronic containment in F/B/RCAL Look at PT Balance PTH/PTDA PTH/PTe Hadronic PTH is dependant on the activity in the whole detector Not possible to calibrate Individual sections of the calorimeter without larger systematic uncertainties

  4. max C. M. Cormack (RAL) NC98 xF3 Analysis 5/6/2001 The Solution: Use Diffractive (LRG) Events C. M. Cormack zMAX zMIN • Method • Standard DIS events with max < 3.4 • yJB > 0.01 - To ensure sufficient hadronic activity • MX > 2 GeV - To ensure sufficient hadronic activity • Look at PT Balance PTH/PTDA • Check individual calorimeters zMIN , zMAX • Study the energy response PTH/PTDAvshadron PTH = Hadronic PT from cells

  5. RCAL BCAL Isolated Diffractive Events Used in Study Selection max < 3.4 yJB > 0.01 MX > 2 GeV CAL ISOLATION FCAL

  6. C. M. Cormack (RAL) NC98 xF3 Analysis 5/6/2001 EnergyScales For DIS • At present there are no tunings of the hadronic energy scales only factors as applied in RCALCOR • A Priori Scale Factors (DATA): • FCAL = 1.00 • BCAL = 1.05 • RCAL = 1.022 • 98/99/00 Dead material map • Double angle PT From CorandCut unbiased • NOTE • The scale factors determined from this analysis should be applied to versions of the MC num98t3.1 and above ONLY!

  7. C. M. Cormack (RAL) NC98 xF3 Analysis 5/6/2001 Diffractive Energy Scales - PT Method Plot of PTDA / PTTRUE HADRON Acceptance reduction due to max cut Acceptance reduction due to Q2cut • Within the Acceptance PT_DA Method unbiased • Cross Checked Possible with Electron PT Angular acceptance cuts: 0.05<  < 2.75

  8. FCAL PTHAD/PTDA BCAL RCAL MC DATA C. M. Cormack (RAL) NC98 xF3 Analysis 5/6/2001 Determination of Hadronic Energy Scales AFTER ISOLATION CUTS Energy Scale factors Determined Statistical Error 0.5 % F/B CAL 2% RCAL

  9. Diffractive: Determination of HAC/EMC Scales • FCAL: No Need to Tune Factors -Values within Errors (1%) • BCAL: EMC (MC) scaled down 2% 98% (+/- 1.5 %) • BCAL: HAC (MC) scaled down 4% 96 % (+/- 1 %) • RCAL: Scale factors Unchanged (+/- 2% (stat))

  10. FCAL PTH/PTDA BCAL RCAL HADRON C. M. Cormack (RAL) NC98 xF3 Analysis 1/3/2001 How does the Hadronic Plot look after ? AFTER ISOLATION CUTS • Energy Scales Look Very Good for whole Angular Range • Front End of BCAL is off forHADRON < 1. Next slide…. • Possibility (need!) to Tune 1st Inner Ring of FCAL ?

  11. Jet Event Selection • Standard NC DIS Event Selection • Jets Selected using Cone Algorithm - In BCAL • 1c < Jet < 2.2 c • ||Jet - e | - 180| < 40  • Forward Energy Flow Resticted • FCAL Energy Outside 2 Inner Rings < 20 GeV Energy Scale Determination From Jets

  12. MC DATA BCAL Energy Scale Determination From Jets Total Scale EMC/HAC fractions Overall Total Hadronic Response off by 2-3% • FIT EMC/HAC Fractions • HAC 95% +/- 1.0% • EMC 98% +/- 1.5%

  13. DATA MC BCALEnergy Scale Determination From Jets Linearity - Energy Response vs. PT Overall Energy Scale is Off by 2-3% for the whole PT Range Consistent with the Number From Diffractive Method

  14. RCAL • FIT EMC/HAC Fractions • HAC 100% +/- 2.0% • EMC 100% +/- 2.0% • BCAL • FIT EMC/HAC Fractions • HAC 95% +/- 1.0% • EMC 98% +/- 1.5% • Relative Hadronic Energy response has been determined for F/B/RCAL • Results from the Diffractive Method are in good agreement within errors with those from Jets Method • Results for HAC/EMC for F/B CAL • Error checks underway - results stable to 0.5% Summary and Conclusion of Energy Scale Systematic • FCAL • FIT EMC/HAC Fractions • HAC 100% +/- 1.0% • EMC 100% +/- 1.5% Summary of Scale factors (MC)

  15. Energy Scale Determination From Jets • Systematic Checks • FCAL Energy < 5 GeV (0.5%) • Jet PT Linearity Response (0.5%) • Different Jet Algorithm ! (0.5%) • MEPS / ARIADNE - Understudy Look for Sample of Events with a Jet in RCAL with little E-FLOW in the rest of the Detector

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