1 / 15

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.

beulah
Télécharger la présentation

SAGDH Analysis status for

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related