H(e,e

1
H(e,ep) Analysis Update

• Chris Crawford
• 2005/04/06

2
TOF Cuts
15
12
Proton TOF
9
6
Electron TOF
15
12
9
6
3
0
3
WC Offsets/Resolution/Cuts
pe-pe(qe)
pp-pp(qe)
qp-qp(qe)
pe qe fe ze pp qp fp zp
fp-fp(fe)
z p- z p(ze)
4
Momentum Offsets
5
WC cuts
Invariant Mass
Missing Mass
6
Luminosity
R 4.9 x 1013/cm2 L 3.1 x 1031/cm2 s
at 100 mA
Different UGBS Run Sets
Red UGBS, Black ABS
7
TOF Efficiency
Tracking efficiency almost ready.
8
Results Asymmetry
Spin angle 47.12 deg
9
Single Asymmetry Extraction
10
Results GE/GM
11
Asymmetry Fine Bins
12
GE/GM Fine Bins
13
Asymmetry Monte Carlo
14
GE/GM Monte Carlo
15
Target Spin Angle
d ( m GE/GM ) 0.73 /deg
Fieldmap 47.12 deg T20 46.5 3 deg
Fit 42 3 deg Hohler
16
Target Spin Angle (Höhler)
17
Q2 Systematics
18
Yield per Q2 bin
19
Asymmetry by Dataset
20
GE/GM by Dataset
21
.Radiative Corrections

• 2.5 sigma W cut 0.2 0.4
• 5.0 sigma W cut 0.4 0.8
• 7.5 sigma W cut 0.6 1.3
• 10. sigma W cut 0.8 2.0
• (predominantly in the left sector)

22
Beam False Asymmetry
23
Target False Asymmetry
24
World Data (Polarization)