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Ageing study with electron

This study focuses on electron ageing in different zones, analyzing data samples from 2010 to 2011 for statistical accuracy. Techniques involve defining 9 zones with precise Bhadron sample runs, producing coefficients, and evaluating EoP effects. Results show improvements with Dasha coefficients, delineating ageing effects on electron selection and fit precision. Plans include further data processing, enhancing calibration for electron ageing effects in all zones.

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Ageing study with electron

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  1. Ageing study with electron

  2. Zone definition 9 8 7 9 zone defined 6 2 4 1 3 5 9 zones defined . Statistics : Minimum biais sample : 20K electron /1 hour run Bhadron sample : 250k electron / 1 hour run Check on 1 run no difference

  3. Data sample • 2010 & 2011 data sample up to Mid August 2011 • 450 pb received • Analysis not yet systematic on all fill • E/p , Cluster/pr , ratio -> PS ageing • 9 zones • 2011: correct by Dasha coefficients.

  4. Electron selection • Associate 2 tracks • Keep for each track the Minmass • Select electron using RichDllE and loose electron id. • Keep the associated particle • In N-tuple apply : • Richelectron id > 0 • Hadron isolation

  5. Fit results • Statistic • 2 million candidates • Bhadron stream • Fit precision • Zone 1-7 1-2 per mil • Zone 8_9 1 to 4 per mil Zone 345

  6. Coefficient produced • Re-evalute EoP using Dasha fine coefficient beginning of June • The first week of June is the reference (fill1852) • Evaluate in range of 40pb-1 the ageing to correct for for each of the 8 zone • Produce coefficients /cell • C_dashaJune * EoP[June]/EoP[current-fill] • Period 40pb-1

  7. Effect of dasha coefficients • Fit results • Effect of dasha coeff outer zone • - Normalisation point : • Fill 1852 Zone 5 : +6% Zone 6: +3.5% Zone 8-9 : +2% Due to ageing Zone 5 : +5% Zone 6 : 4% Zone 8 : 2%

  8. Effect of Dasha coefficient All sigmas improve with Dasha oefficients

  9. Dasha Coefficient /zone middle Inner Outer Large Tails

  10. Normalize / fill1852 Same trend for all Stronger close to the beam

  11. Trend to apply Zone 3 : 5% Zone 4: 4.2% Zone 7: 3% Zone 1 : 9% Zone 2 : 3.8% Averaged ageing 700pb-1 :8.5% - ~0.5% /40pb-1

  12. Trend to apply (Outer) Zone 5 :9.5% Zone 6 : 7% Zone 8-9 :3%

  13. PS trend Ratio No effect bigger than 2% Due to PS More study /zone EoP Cluster/P

  14. Dasha zone

  15. Comparison to dasha coefficient ZoneI2 Zone 1 ZoneI1 Zone 1

  16. Dasha Trend spread Trend spread ~ 2.5% Alll statistics used ?

  17. Dasha trend medium

  18. Outer part With the present stat used Spred of 4% Correcting before fine calibration will introduce an unphysical effect and therefore the time needed converge will increse Using ALL Fmdst statistics and using only fill above 3pb-1 should solve this effect

  19. Plans • Data have been processed up to the technical stop and correction file will be produced this week • More statistics produced for the early runs • The present calibration is a consequence of last year correction with LED • Large sample of electron being used to understand the EoP tails ( Victor) , PID efficiencies • Understand calibration of electrons

  20. Ageing effect in all zones

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