CLAS Physics Database

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Measurement E40M42

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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_t, dimensionless
Target spin asymmetry A_t=(dσ_t/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_t, 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_t, dimensionless	Data errors, dimensionless	Systematic errors, dimensionless
-0.9	-168	-0.142	0.125	0.0083
-0.7	-168	-0.362	0.123	0.0162
-0.5	-168	-0.114	0.103	0.0064
-0.3	-168	-0.095	0.112	0.0068
-0.1	-168	-0.295	0.107	0.0133
0.1	-168	-0.167	0.082	0.0065
0.3	-168	-0.346	0.093	0.0131
0.5	-168	-0.016	0.086	0.0033
0.7	-168	-0.129	0.126	0.0082
0.9	-168	-0.169	0.091	0.007
-0.9	-144	-0.154	0.094	0.0104
-0.7	-144	-0.303	0.125	0.0189
-0.5	-144	-0.337	0.091	0.016
-0.3	-144	-0.336	0.076	0.0153
-0.1	-144	-0.26	0.067	0.0131
0.1	-144	-0.298	0.055	0.0119
0.3	-144	-0.313	0.056	0.0112
0.5	-144	-0.351	0.065	0.013
0.7	-144	-0.283	0.068	0.0106
0.9	-144	-0.198	0.092	0.0121
-0.9	-120	-0.304	0.092	0.0147
-0.7	-120	-0.297	0.069	0.0118
-0.5	-120	-0.208	0.058	0.0104
-0.3	-120	-0.264	0.05	0.0112
-0.1	-120	-0.269	0.045	0.0107
0.1	-120	-0.334	0.046	0.0116
0.3	-120	-0.262	0.048	0.0096
0.5	-120	-0.23	0.044	0.0076
0.7	-120	-0.193	0.053	0.0074
0.9	-120	-0.26	0.07	0.0138
-0.9	-96	-0.084	0.075	0.0076
-0.7	-96	-0.107	0.072	0.0066
-0.5	-96	-0.169	0.051	0.0073
-0.3	-96	-0.183	0.044	0.0076
-0.1	-96	-0.182	0.042	0.0073
0.1	-96	-0.191	0.04	0.0067
0.3	-96	-0.236	0.046	0.0075
0.5	-96	-0.255	0.045	0.0071
0.7	-96	-0.175	0.054	0.0063
0.9	-96	-0.204	0.076	0.0137
-0.9	-72	-0.056	0.076	0.0044
-0.7	-72	-0.022	0.059	0.0029
-0.5	-72	-0.2	0.056	0.0069
-0.3	-72	-0.235	0.044	0.0068
-0.1	-72	-0.048	0.046	0.0045
0.1	-72	-0.082	0.045	0.0044
0.3	-72	-0.058	0.048	0.0038
0.5	-72	-0.086	0.053	0.0038
0.7	-72	-0.147	0.058	0.0054
0.9	-72	-0.138	0.088	0.0128
-0.9	-48	-0.073	0.097	0.0048
-0.7	-48	-0.107	0.058	0.0033
-0.5	-48	-0.047	0.065	0.0024
-0.3	-48	-0.052	0.063	0.0031
-0.1	-48	0.115	0.07	0.0041
0.1	-48	-0.07	0.093	0.0039
0.3	-48	-0.043	0.097	0.003
0.5	-48	0.026	0.11	0.0024
0.7	-48	-0.162	0.083	0.0052
0.9	-48	-0.13	0.095	0.013
-0.9	-24	-0.026	0.094	0.0018
-0.7	-24	-0.059	0.071	0.0029
-0.5	-24	0.02	0.093	0.0009
-0.3	-24	-0.05	0.091	0.0019
-0.1	-24	-0.053	0.14	0.0028
0.1	-24	0.279	0.197	0.0099
0.3	-24	-0.222	0.146	0.005
0.5	-24	-0.182	0.215	0.008
0.7	-24	-0.127	0.237	0.0089
0.9	-24	-0.067	0.104	0.0077
-0.9	0	-0.176	0.099	0.0121
-0.7	0	0.013	0.093	0.001
-0.5	0	-0.09	0.076	0.0027
-0.3	0	0.002	0.105	0.0001
-0.1	0	0.016	0.137	0.0005
0.1	0	0.033	0.194	0.0013
0.3	0	0.005	0.153	0.0002
0.5	0	0.14	0.173	0.0031
0.7	0	-0.069	0.16	0.0021
0.9	0	-0.438	0.194	0.0411
-0.9	24	0.021	0.09	0.0015
-0.7	24	0.019	0.081	0.0014
-0.5	24	-0.144	0.078	0.0058
-0.3	24	-0.136	0.094	0.0042
-0.1	24	0.071	0.136	0.0035
0.1	24	-0.127	0.193	0.006
0.3	24	-0.066	0.172	0.0029
0.5	24	-0.019	0.15	0.0013
0.7	24	-0.123	0.139	0.0047
0.9	24	0.031	0.162	0.008
-0.9	48	-0.07	0.094	0.004
-0.7	48	0.004	0.06	0.0004
-0.5	48	0.004	0.061	0.0018
-0.3	48	0.071	0.057	0.0035
-0.1	48	0.073	0.064	0.0037
0.1	48	0.009	0.073	0.0032
0.3	48	0.08	0.086	0.0034
0.5	48	-0.017	0.084	0.0024
0.7	48	-0.084	0.089	0.0036
0.9	48	0.228	0.121	0.0189
-0.9	72	0.004	0.088	0.004
-0.7	72	-0.123	0.059	0.0053
-0.5	72	0.142	0.054	0.0059
-0.3	72	0.078	0.044	0.0047
-0.1	72	0.105	0.044	0.005
0.1	72	0.043	0.043	0.004
0.3	72	0.062	0.046	0.0037
0.5	72	0.028	0.049	0.003
0.7	72	-0.058	0.055	0.0034
0.9	72	0.206	0.09	0.0139
-0.9	96	0.189	0.09	0.0099
-0.7	96	0.214	0.06	0.0086
-0.5	96	0.197	0.048	0.0078
-0.3	96	0.013	0.042	0.0063
-0.1	96	0.203	0.043	0.0076
0.1	96	0.158	0.042	0.0063
0.3	96	0.263	0.045	0.0072
0.5	96	0.154	0.05	0.0055
0.7	96	0.166	0.06	0.0063
0.9	96	0.14	0.085	0.0126
-0.9	120	0.055	0.079	0.0091
-0.7	120	0.119	0.062	0.0087
-0.5	120	0.246	0.062	0.0118
-0.3	120	0.24	0.052	0.0108
-0.1	120	0.256	0.053	0.0108
0.1	120	0.208	0.054	0.0096
0.3	120	0.169	0.048	0.0075
0.5	120	0.259	0.053	0.0085
0.7	120	0.175	0.06	0.0074
0.9	120	0.293	0.112	0.019
-0.9	144	-0.026	0.088	0.0103
-0.7	144	0.326	0.101	0.0156
-0.5	144	0.276	0.088	0.0149
-0.3	144	0.276	0.075	0.0142
-0.1	144	0.18	0.068	0.0113
0.1	144	0.139	0.067	0.0098
0.3	144	0.19	0.061	0.0089
0.5	144	0.269	0.07	0.0103
0.7	144	0.158	0.066	0.0066
0.9	144	0.006	0.094	0.0078
-0.9	168	0.177	0.124	0.0094
-0.7	168	0.194	0.126	0.0093
-0.5	168	0.159	0.106	0.0076
-0.3	168	-0.007	0.079	0.006
-0.1	168	0.184	0.111	0.0098
0.1	168	0.166	0.088	0.0069
0.3	168	0.013	0.079	0.0039
0.5	168	-0.031	0.078	0.0033
0.7	168	0.023	0.096	0.0026
0.9	168	-0.109	0.095	0.0052