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Measurement E102M112

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Experiment: E-89-039, 2007

Spokespersons: S. Dytman, K. Giovanetti

Measurement comment: Electron beam energy is 2.567 Gev. From fit to angular xs with constraint that fitted xs be positive over all phi.

Publication:

Quantity measured: dσ/dΩT+ε·dσ/dΩL, mcbn/srad
The differential cross section for transverse photons plus the degree of longitudinal polarization of the virtual photon times the differential cross section for longitudinal photons.
Beam: e, polarization: none
Target: p (Z=1, A=1), polarization: none
Final state: η p, polarization: none

Q2 : 0.6 — 1 GeV2
W : 1.65 — 1.67 GeV

Observable quantity measured (Y axis): dσ/dΩT+ε·dσ/dΩL, mcbn/srad
Plot measurement data

Parameter (X axis): cos(θ), dimensionless

Click here to get data in text file, delimited with tabs.

Measured data:

cos(θ),
dimensionless
dσ/dΩT+ε·dσ/dΩL,
mcbn/srad
Negative uncertainty,
mcbn/srad
Positive uncertainty,
mcbn/srad
Systematic errors,
mcbn/srad
-0.9 0.161 0.019 0.019 0.009
-0.7 0.223 0.1 0.1 0.003
-0.5 0.132 0.031 0.031 0.012
-0.3 0.135 0.024 0.025 0.013
-0.1 0.088 0.018 0.018 0.006
0.1 0.101 0.022 0.022 0.006
0.3 0.114 0.027 0.027 0.011
0.5 0.059 0.014 0.016 0.004
0.7 0.066 0.021 0.025 0.009
0.9 0.014 0.016 0.016 0.012