CLAS Physics Database

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Measurement E40M43

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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 :	1.25 — 1.3 GeV

Select data slice:
cos(θ) = dimensionless

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

Parameter (X axis): φ, degrees

Click here to view sliced data.

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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	-0.717	0.33	0.1056
-0.7	-168	-0.105	0.179	0.0088
-0.5	-168	-0.032	0.255	0.0093
-0.1	-168	-0.353	0.109	0.011
0.1	-168	-0.001	0.173	0.0061
0.3	-168	-0.182	0.13	0.007
0.5	-168	-0.107	0.128	0.0053
0.7	-168	-0.265	0.175	0.0197
0.9	-168	-0.165	0.214	0.0203
-0.9	-144	-0.235	0.189	0.0231
-0.7	-144	-0.35	0.171	0.0285
-0.5	-144	-0.274	0.126	0.0212
-0.3	-144	-0.398	0.099	0.0225
-0.1	-144	-0.327	0.102	0.0224
0.1	-144	-0.436	0.086	0.0196
0.3	-144	-0.347	0.093	0.0159
0.5	-144	-0.356	0.091	0.0156
0.7	-144	-0.383	0.132	0.0271
0.9	-144	-0.133	0.152	0.0183
-0.9	-120	-0.439	0.144	0.0318
-0.7	-120	-0.339	0.101	0.0192
-0.5	-120	-0.321	0.091	0.0199
-0.3	-120	-0.355	0.064	0.0157
-0.1	-120	-0.266	0.063	0.0121
0.1	-120	-0.433	0.072	0.0178
0.3	-120	-0.281	0.068	0.0104
0.5	-120	-0.296	0.078	0.0119
0.7	-120	-0.362	0.083	0.0151
0.9	-120	-0.141	0.158	0.0211
-0.9	-96	-0.234	0.151	0.025
-0.7	-96	-0.182	0.083	0.0109
-0.5	-96	-0.236	0.094	0.0175
-0.3	-96	-0.212	0.059	0.0099
-0.1	-96	-0.261	0.055	0.01
0.1	-96	-0.284	0.057	0.0104
0.3	-96	-0.19	0.064	0.0077
0.5	-96	-0.13	0.07	0.0055
0.7	-96	-0.082	0.088	0.0056
0.9	-96	-0.111	0.114	0.0187
-0.9	-72	-0.023	0.135	0.0123
-0.7	-72	-0.096	0.087	0.0068
-0.5	-72	-0.105	0.069	0.0058
-0.3	-72	-0.172	0.057	0.0068
-0.1	-72	-0.138	0.065	0.0071
0.1	-72	-0.162	0.058	0.0061
0.3	-72	-0.051	0.058	0.0029
0.5	-72	-0.246	0.075	0.0105
0.7	-72	-0.028	0.099	0.0044
0.9	-72	-0.236	0.125	0.0223
-0.9	-48	-0.199	0.208	0.0281
-0.7	-48	0.043	0.109	0.0029
-0.5	-48	-0.055	0.086	0.0033
-0.3	-48	-0.057	0.073	0.0029
-0.1	-48	-0.066	0.08	0.0039
0.1	-48	0.012	0.093	0.0021
0.3	-48	-0.164	0.082	0.0043
0.5	-48	-0.094	0.12	0.0046
0.7	-48	-0.15	0.11	0.0074
0.9	-48	0.158	0.194	0.0233
-0.9	-24	0.141	0.161	0.0142
-0.7	-24	0.227	0.135	0.0207
-0.5	-24	0.178	0.114	0.0111
-0.3	-24	0.024	0.623	0.018
-0.1	-24	0.321	0.2	0.0177
0.1	-24	-0.219	0.177	0.0083
0.7	-24	0.19	0.226	0.0107
0.9	-24	0.001	0.166	0.0126
-0.9	0	-0.053	0.116	0.0041
-0.7	0	0.215	0.107	0.015
-0.5	0	-0.029	0.129	0.0037
-0.3	0	-0.095	0.114	0.004
-0.1	0	-0.009	0.193	0.0053
0.9	0	-0.273	0.171	0.0192
-0.9	24	-0.04	0.154	0.0057
-0.7	24	-0.132	0.118	0.0114
-0.5	24	-0.132	0.109	0.0098
-0.3	24	-0.083	0.118	0.0041
-0.1	24	-0.131	0.121	0.0039
0.1	24	-0.077	0.185	0.0042
0.7	24	-0.117	1.678	0.0215
0.9	24	0.253	0.18	0.0235
-0.9	48	-0.024	0.136	0.0086
-0.7	48	0.03	0.083	0.002
-0.5	48	-0.077	0.071	0.0038
-0.3	48	0.056	0.072	0.0033
-0.1	48	0.076	0.118	0.0061
0.1	48	-0.143	0.081	0.0048
0.3	48	-0.028	0.083	0.0024
0.5	48	0.051	0.139	0.0043
0.7	48	0.139	0.125	0.0074
0.9	48	0.069	0.234	0.0198
-0.9	72	-0.186	0.15	0.0224
-0.7	72	0.094	0.075	0.0063
-0.5	72	-0.07	0.065	0.005
-0.3	72	0.064	0.06	0.0047
-0.1	72	0.017	0.052	0.0035
0.1	72	0.026	0.051	0.0029
0.3	72	0.107	0.058	0.004
0.5	72	0.011	0.087	0.0071
0.7	72	0.153	0.093	0.0091
0.9	72	-0.148	0.132	0.02
-0.9	96	0.218	0.166	0.0228
-0.7	96	0.121	0.073	0.0088
-0.5	96	0.09	0.061	0.0081
-0.3	96	0.169	0.061	0.0088
-0.1	96	0.215	0.06	0.0087
0.1	96	0.199	0.062	0.008
0.3	96	0.205	0.061	0.0072
0.5	96	0.102	0.07	0.005
0.7	96	0.092	0.092	0.006
0.9	96	0.118	1.742	0.0368
-0.9	120	0.04	0.133	0.0171
-0.7	120	0.194	0.105	0.0157
-0.5	120	0.331	0.085	0.0174
-0.3	120	0.297	0.096	0.0182
-0.1	120	0.199	0.077	0.0108
0.1	120	0.203	0.085	0.0103
0.3	120	0.162	0.083	0.0083
0.5	120	0.116	0.083	0.0059
0.7	120	0.23	0.11	0.0156
0.9	120	0.193	0.181	0.0268
-0.9	144	0.43	0.252	0.0468
-0.7	144	0.272	0.142	0.0192
-0.5	144	0.191	0.161	0.0213
-0.3	144	0.199	0.108	0.0153
-0.1	144	0.317	0.121	0.0204
0.1	144	0.228	1.229	0.0276
0.3	144	0.034	0.108	0.0067
0.5	144	0.353	0.12	0.018
0.7	144	-0.006	0.101	0.0064
0.9	144	-0.142	0.168	0.0171
-0.9	168	0.223	0.261	0.0245
-0.7	168	0.374	0.405	0.0421
-0.5	168	0.533	0.499	0.1299
-0.3	168	0.5	0.198	0.0353
-0.1	168	0.281	3.647	0.0532
0.1	168	0.22	0.135	0.0118
0.3	168	0.078	0.145	0.0051
0.5	168	0.011	0.145	0.0043
0.7	168	0.109	0.205	0.0083
0.9	168	-0.325	0.198	0.031