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Ageing study with electron

Ageing study with electron. 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.

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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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