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SAGDH Analysis status for

SAGDH Analysis status for. the first period data. Presented by. Hai-jiang Lu. USTC group, China. Difference (1 st && 2 nd ). Analysis Status for the 1 st. Summary. Difference. Configuration:. Half statistics. Septum: wrong wrapped wire. Background.

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SAGDH Analysis status for

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  1. SAGDH Analysis status for the first period data Presented by Hai-jiang Lu USTC group, China • Difference (1st && 2nd) • Analysis Status for the 1st • Summary

  2. Difference • Configuration: Half statistics Septum: wrong wrapped wire. Background • DAQ: High trigger rate Low lifetime • Software: Helicity,Splitted files Fixed

  3. before calibration after calibration Status: PID Calibration • Calibration (Gas Cherenkov): Align Single-photon Electron peak to 200 • Calibration (lead glass): Minimize the following: 0.126/sqrt(x)-0.063

  4. Cher Cut: R.cer.asum_c> 350 Status: PID efficiency (Cherenkov) • efficiency (Gas Cherenkov): Detection efficiency: >99.99% Cut efficiency: electron accept efficiency: 99.7%pion reject efficiency : 97.8%

  5. Shower Cut: E_tot/p > x0 E_Pre/p >x1 Status: PID efficiency (lead glass) • efficiency (Gas Cherenkov): Detection efficiency: >99.5% Cut efficiency:

  6. Status: Scintillator inefficiency Both Scintillator are triggered. Only one Scintillator (S1 or S2) is triggered. %

  7. Status: VDC inefficiency one Track reconstructed in VDC. more than one tracks reconstructed in VDC %

  8. Status: cross section asymmetry

  9. Status: Statistics uncertainty not real random Binomial, not normal or gaussian

  10. for different helicity Status: Charge Asymmetry %

  11. ps Status: Lifetime ps_rate = real_rate/prescal If R>Rmax, then additional Deadtime: (R-Rmax)/R, Rmax

  12. Status: asymmetry of elastic %

  13. Status: asymmetry of production (he3) Red marker:false asymmetry from Nitrogen: Low nu, has a high elastic tail?

  14. Summary • Optics (N.Liyanaga) • PID • Scintillator,VDC inefficiency • Charge correction • Lifetime correction • Dilution • Elastic asymmetry • Acceptance • False asymmetry • Cross section • Radiative correction • Physical asymmetry • Systematic uncertainty • Statistic uncertainty completed Underway Partially completed Schedule

  15. Acknowledgement • Hall-A, J.P • Vince • Alexandre,X.D, Y. Qiang, Rob, K.Slifer, P.Sovignon, J.Singh,Tim………………. • All

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