CLAS Physics Database

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Measurement E40M2

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Experiment: EG1, 2000

Spokespersons: P. Stoler, V. Burkert, R. Minehart

Publication:

A. S. Biselli, V. D. Burkert, and CLAS Collaboration First measurement of target and double spin asymmetries for polarized e- polarized p → e p π⁰ in the nucleon resonance region above the Δ(1232) // PRC 78, 045204 (2008)

Quantity measured: A_et, dimensionless
Double spin asymmetry A_et=(dσ_et/dΩ^*)/(dσ₀/dΩ^*).
Beam: e, polarization: polarized
Target: p (Z=1, A=1), polarization: longitudinal
Final state: π⁰p, polarization: none

Q² :	0.187 — 0.317 GeV²
W :	1.15 — 1.2 GeV

Select data slice:
cos(θ) = dimensionless

Observable quantity measured (Y axis): A_et, dimensionless
Plot measurement data

Parameter (X axis): φ, degrees

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

Measured data:

cos(θ), dimensionless	φ, degrees	A_et, dimensionless	Data errors, dimensionless	Systematic errors, dimensionless
-0.9	-168	0.708	0.245	0.0455
-0.7	-168	-0.026	0.309	0.0035
-0.5	-168	-0.454	0.247	0.0359
-0.3	-168	-0.488	0.171	0.0253
-0.1	-168	-0.101	0.148	0.008
0.1	-168	-0.394	0.155	0.0241
0.3	-168	-0.591	0.127	0.0325
0.5	-168	-0.467	0.125	0.0303
0.7	-168	-0.284	0.125	0.0194
0.9	-168	-0.125	0.161	0.0084
-0.9	-144	-0.059	0.267	0.0088
-0.7	-144	0.016	0.117	0.001
-0.5	-144	-0.179	0.091	0.008
-0.3	-144	-0.2	0.08	0.0086
-0.1	-144	-0.315	0.085	0.0155
0.1	-144	-0.549	0.095	0.0323
0.3	-144	-0.387	0.079	0.0173
0.5	-144	-0.481	0.097	0.026
0.7	-144	-0.356	0.11	0.0237
0.9	-144	-0.049	0.16	0.0024
-0.9	-120	0.252	0.154	0.0152
-0.7	-120	-0.069	0.081	0.0025
-0.5	-120	-0.206	0.079	0.0084
-0.3	-120	-0.276	0.069	0.0095
-0.1	-120	-0.3	0.073	0.0111
0.1	-120	-0.307	0.074	0.0122
0.3	-120	-0.153	0.078	0.0064
0.5	-120	-0.34	0.108	0.0175
0.7	-120	-0.433	0.161	0.0278
0.9	-120	-0.123	0.212	0.0153
-0.9	-96	0.123	0.125	0.0056
-0.7	-96	-0.097	0.085	0.0042
-0.5	-96	-0.22	0.071	0.0079
-0.3	-96	-0.262	0.066	0.0085
-0.1	-96	-0.179	0.07	0.0065
0.1	-96	-0.232	0.068	0.0081
0.3	-96	-0.135	0.074	0.0057
0.5	-96	-0.239	0.089	0.0129
0.7	-96	-0.15	0.105	0.0097
0.9	-96	0.008	0.16	0.0035
-0.9	-72	-0.582	0.152	0.0326
-0.7	-72	-0.25	0.098	0.0095
-0.9	-48	-0.151	0.177	0.0078
-0.9	48	-0.221	0.134	0.0121
-0.9	72	-0.118	0.108	0.0062
-0.7	72	-0.2	0.086	0.0073
-0.9	96	0.012	0.107	0.0023
-0.7	96	0.033	0.082	0.003
-0.5	96	-0.187	0.072	0.0072
-0.3	96	-0.305	0.074	0.0125
-0.1	96	-0.126	0.076	0.0056
0.1	96	-0.309	0.08	0.0151
0.3	96	-0.211	0.079	0.0103
0.5	96	-0.114	0.077	0.0054
0.7	96	-0.074	0.094	0.0049
0.9	96	-0.038	0.2	0.0071
-0.9	120	0.042	0.12	0.0058
-0.7	120	0.087	0.084	0.0035
-0.5	120	-0.117	0.08	0.0049
-0.3	120	-0.315	0.078	0.0133
-0.1	120	-0.247	0.077	0.0104
0.1	120	-0.317	0.086	0.0164
0.3	120	-0.302	0.082	0.0132
0.5	120	-0.406	0.092	0.0187
0.7	120	-0.122	0.14	0.0091
0.9	120	-0.081	0.199	0.0075
-0.9	144	0.284	0.13	0.013
-0.7	144	-0.176	0.1	0.0087
-0.5	144	-0.239	0.103	0.0141
-0.3	144	-0.316	0.089	0.0156
-0.1	144	-0.496	0.1	0.0302
0.1	144	-0.497	0.084	0.0238
0.3	144	-0.345	0.096	0.0215
0.5	144	-0.326	0.105	0.0227
0.7	144	-0.16	0.114	0.0088
0.9	144	0.018	0.213	0.0045
-0.9	168	0.574	0.182	0.03
-0.7	168	0.312	0.173	0.0205
-0.5	168	0.047	0.214	0.0038
-0.3	168	-0.83	0.191	0.0545
-0.1	168	-0.526	0.183	0.037
0.1	168	-0.451	0.184	0.0311
0.3	168	-0.59	0.131	0.0262
0.5	168	-0.545	0.185	0.0413
0.7	168	-0.415	0.156	0.0252
0.9	168	-0.555	0.229	0.0435