CLAS Physics Database

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Measurement E40M19

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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 :	0.452 — 0.77 GeV²
W :	1.2 — 1.25 GeV

Select data slice:
cos(θ) = dimensionless

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

Parameter (X axis): φ, degrees

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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	0.752	0.194	0.0342
-0.7	-168	-0.261	0.176	0.0122
-0.5	-168	-0.16	0.148	0.0072
-0.3	-168	-0.696	0.173	0.0264
-0.1	-168	-0.859	0.171	0.0336
0.1	-168	-0.82	0.127	0.0192
0.3	-168	-0.957	0.15	0.0328
0.5	-168	-0.595	0.127	0.0176
0.7	-168	-0.604	0.193	0.036
0.9	-168	-0.25	0.131	0.0107
-0.9	-144	0.563	0.139	0.0178
-0.7	-144	0.068	0.177	0.004
-0.5	-144	-0.361	0.133	0.0125
-0.3	-144	-0.381	0.111	0.0111
-0.1	-144	-0.652	0.102	0.0185
0.1	-144	-0.495	0.082	0.0102
0.3	-144	-0.615	0.084	0.0141
0.5	-144	-0.442	0.096	0.013
0.7	-144	-0.369	0.1	0.0111
0.9	-144	-0.179	0.132	0.0098
-0.9	-120	0.373	0.134	0.0134
-0.7	-120	-0.142	0.1	0.0043
-0.5	-120	-0.245	0.084	0.0055
-0.3	-120	-0.35	0.074	0.0079
-0.1	-120	-0.304	0.066	0.0064
0.1	-120	-0.506	0.069	0.0121
0.3	-120	-0.375	0.07	0.0091
0.5	-120	-0.306	0.064	0.0056
0.7	-120	-0.101	0.077	0.003
0.9	-120	0.047	0.1	0.006
-0.9	-96	-0.107	0.106	0.0043
-0.7	-96	-0.144	0.103	0.0066
-0.5	-96	-0.198	0.073	0.0041
-0.3	-96	-0.276	0.064	0.0052
-0.1	-96	-0.38	0.061	0.0078
0.1	-96	-0.303	0.057	0.0052
0.3	-96	-0.258	0.066	0.0056
0.5	-96	-0.208	0.066	0.0042
0.7	-96	-0.093	0.078	0.003
0.9	-96	0.198	0.109	0.0092
-0.9	-72	-0.134	0.108	0.0048
-0.7	-72	-0.209	0.084	0.005
-0.5	-72	-0.202	0.08	0.0052
-0.3	-72	-0.281	0.064	0.0051
-0.1	-72	-0.375	0.066	0.0075
0.1	-72	-0.381	0.064	0.0071
0.3	-72	-0.275	0.068	0.0056
0.5	-72	-0.105	0.076	0.0027
0.7	-72	-0.194	0.084	0.0058
0.9	-72	0.25	0.127	0.0106
-0.9	-48	-0.22	0.137	0.0109
-0.7	-48	-0.58	0.087	0.0158
-0.5	-48	-0.524	0.096	0.0163
-0.3	-48	-0.32	0.089	0.0069
-0.1	-48	-0.405	0.096	0.0072
0.1	-48	-0.328	0.133	0.0088
0.3	-48	-0.36	0.138	0.009
0.5	-48	-0.166	0.153	0.0056
0.7	-48	0.013	0.118	0.0021
0.9	-48	0.223	0.136	0.0089
-0.9	-24	-0.466	0.136	0.0247
-0.7	-24	-0.539	0.106	0.0224
-0.5	-24	-0.653	0.141	0.029
-0.3	-24	-0.81	0.139	0.0179
-0.1	-24	-0.642	0.211	0.0195
0.1	-24	-0.604	0.272	0.0205
0.3	-24	-0.431	0.212	0.0075
0.5	-24	0.387	0.316	0.0171
0.7	-24	-0.013	0.335	0.0022
0.9	-24	0.737	0.161	0.0266
-0.9	0	-0.296	0.142	0.0166
-0.7	0	-0.694	0.144	0.045
-0.5	0	-0.297	0.109	0.0081
-0.3	0	-0.557	0.152	0.0153
-0.1	0	-0.46	0.195	0.0107
0.1	0	-0.382	0.275	0.0125
0.3	0	0.09	0.214	0.0057
0.5	0	0.201	0.236	0.0063
0.7	0	0.107	0.227	0.0041
0.9	0	0.606	0.275	0.0472
-0.9	24	-0.38	0.127	0.0183
-0.7	24	-0.4	0.117	0.02
-0.5	24	-0.469	0.115	0.017
-0.3	24	-0.534	0.138	0.0136
-0.1	24	-0.378	0.19	0.0114
0.1	24	-0.335	0.28	0.0132
0.3	24	-0.289	0.245	0.0082
0.5	24	-0.169	0.211	0.006
0.7	24	-0.066	0.198	0.0031
0.9	24	0.698	0.25	0.0546
-0.9	48	-0.147	0.133	0.0063
-0.7	48	-0.283	0.085	0.0082
-0.5	48	-0.431	0.088	0.0138
-0.3	48	-0.367	0.08	0.009
-0.1	48	-0.511	0.091	0.011
0.1	48	-0.536	0.104	0.012
0.3	48	-0.385	0.12	0.009
0.5	48	-0.226	0.119	0.0048
0.7	48	0.202	0.127	0.0074
0.9	48	0.315	0.162	0.0202
-0.9	72	-0.153	0.123	0.0067
-0.7	72	-0.256	0.085	0.008
-0.5	72	-0.404	0.075	0.0118
-0.3	72	-0.466	0.063	0.0098
-0.1	72	-0.3	0.06	0.0064
0.1	72	-0.424	0.061	0.0083
0.3	72	-0.165	0.064	0.0036
0.5	72	-0.102	0.068	0.0025
0.7	72	-0.074	0.077	0.0028
0.9	72	0.15	0.119	0.006
-0.9	96	0.257	0.121	0.0102
-0.7	96	-0.285	0.081	0.0083
-0.5	96	-0.22	0.064	0.005
-0.3	96	-0.304	0.058	0.0058
-0.1	96	-0.283	0.059	0.0058
0.1	96	-0.299	0.058	0.0054
0.3	96	-0.266	0.059	0.0051
0.5	96	-0.282	0.068	0.0063
0.7	96	-0.221	0.082	0.0063
0.9	96	0.032	0.115	0.0053
-0.9	120	0.295	0.11	0.0082
-0.7	120	-0.081	0.085	0.0022
-0.5	120	-0.392	0.084	0.0122
-0.3	120	-0.26	0.07	0.0062
-0.1	120	-0.424	0.072	0.011
0.1	120	-0.407	0.073	0.0113
0.3	120	-0.36	0.066	0.0076
0.5	120	-0.313	0.071	0.0071
0.7	120	-0.218	0.081	0.0068
0.9	120	-0.11	0.143	0.0071
-0.9	144	0.219	0.123	0.0048
-0.7	144	-0.084	0.128	0.0044
-0.5	144	-0.272	0.116	0.0104
-0.3	144	-0.492	0.102	0.0162
-0.1	144	-0.751	0.099	0.0214
0.1	144	-0.802	0.101	0.0245
0.3	144	-0.688	0.087	0.0162
0.5	144	-0.524	0.095	0.015
0.7	144	-0.267	0.09	0.0068
0.9	144	-0.082	0.13	0.0083
-0.9	168	0.701	0.175	0.0289
-0.7	168	0.183	0.168	0.0084
-0.5	168	-0.548	0.152	0.0187
-0.3	168	-0.346	0.113	0.0078
-0.1	168	-1.125	0.184	0.0508
0.1	168	-0.836	0.13	0.0232
0.3	168	-0.817	0.119	0.0194
0.5	168	-0.717	0.118	0.0178
0.7	168	-0.544	0.14	0.019
0.9	168	-0.143	0.134	0.0083