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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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Presentation Transcript

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


Difference

  • Configuration:

Half statistics

Septum: wrong wrapped wire.

Background

  • DAQ:

High trigger rate

Low lifetime

  • Software:

Helicity,Splitted files

Fixed


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


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%


Shower Cut:

E_tot/p > x0

E_Pre/p >x1

Status: PID efficiency (lead glass)

  • efficiency (Gas Cherenkov):

Detection efficiency: >99.5%

Cut efficiency:


Status: Scintillator inefficiency

Both Scintillator are triggered.

Only one Scintillator (S1 or S2) is triggered.

%


Status: VDC inefficiency

one Track reconstructed in VDC.

more than one tracks reconstructed in VDC

%


Status: cross section asymmetry


Status: Statistics uncertainty

not real random

Binomial,

not normal

or gaussian


for different helicity

Status: Charge Asymmetry

%


ps

Status: Lifetime

ps_rate = real_rate/prescal

If R>Rmax, then additional Deadtime:

(R-Rmax)/R,

Rmax


Status: asymmetry of elastic

%


Status: asymmetry of production (he3)

Red marker:false asymmetry from Nitrogen:

Low nu, has a high elastic tail?


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


Acknowledgement

  • Hall-A, J.P

  • Vince

  • Alexandre,X.D, Y. Qiang, Rob, K.Slifer,

P.Sovignon, J.Singh,Tim……………….

  • All


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