CLAS Physics Database

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Measurement E40M17

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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 :	1.1 — 1.15 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	-1.302	1.254	0.5705
-0.7	-168	-0.328	0.394	0.0318
-0.5	-168	-0.655	0.318	0.0431
-0.3	-168	-0.239	0.2	0.0178
-0.1	-168	-0.52	0.26	0.0346
0.1	-168	-0.523	0.252	0.0333
0.3	-168	-0.481	0.318	0.0445
0.5	-168	-0.161	0.327	0.0187
0.7	-168	0.535	0.255	0.0313
0.9	-168	0.008	0.329	0.0044
-0.9	-144	0.22	0.287	0.0216
-0.7	-144	-0.237	0.326	0.0182
-0.5	-144	-0.562	0.257	0.031
-0.3	-144	-0.255	0.234	0.0189
-0.1	-144	-0.651	0.257	0.0425
0.1	-144	-0.643	0.297	0.0487
0.3	-144	-0.861	0.296	0.0582
0.5	-144	-0.417	0.228	0.0263
0.7	-144	-0.149	0.266	0.0128
0.9	-144	0.342	0.211	0.0165
-0.9	-120	0.256	0.278	0.0264
-0.7	-120	1.977	1.953	0.9035
-0.5	-120	-0.094	0.24	0.0048
-0.3	-120	-0.431	0.386	0.0464
-0.1	-120	-0.434	0.495	0.0726
0.1	-120	0.029	0.218	0.017
0.3	-120	-0.321	0.239	0.0262
0.5	-120	-0.547	0.427	0.078
0.7	-120	0.23	0.219	0.0121
0.9	-120	-0.048	0.343	0.007
-0.9	-96	-0.338	0.284	0.0387
-0.7	-96	-0.385	0.397	0.0543
-0.5	-96	-0.186	0.298	0.0141
-0.3	-96	-0.031	0.459	0.0063
-0.1	-96	-0.22	0.322	0.0222
0.1	-96	-0.923	0.341	0.0778
0.3	-96	-0.07	0.219	0.0148
0.5	-96	-0.431	0.285	0.0396
0.7	-96	-0.318	0.4	0.0479
0.9	-96	0.43	0.3	0.0342
-0.9	-72	-0.014	0.396	0.0051
-0.7	-72	-0.221	0.381	0.0321
-0.5	-72	-0.465	0.294	0.0424
-0.3	-72	0.353	0.364	0.0469
-0.1	-72	-0.654	0.881	0.2227
0.1	-72	-3.018	3.838	2.3657
0.3	-72	0.151	0.364	0.0231
0.5	-72	0.423	0.276	0.0316
0.7	-72	0.231	0.238	0.0127
0.9	-72	1.305	0.815	0.2742
-0.9	-48	-0.314	0.323	0.0475
-0.7	-48	-0.549	0.422	0.0961
-0.5	-48	0.037	0.533	0.0297
-0.3	-48	-0.366	0.73	0.0836
0.1	-48	0.473	1.377	0.1923
0.3	-48	0.744	2.027	0.4317
0.5	-48	-0.401	0.37	0.0345
0.7	-48	0.299	0.388	0.0234
0.9	-48	0.143	0.343	0.0096
-0.9	-24	-0.175	0.382	0.0298
-0.5	-24	-0.865	1.771	0.5523
-0.1	-24	-0.04	0.328	0.0165
0.1	-24	0.614	0.573	0.0513
0.3	-24	-0.754	0.622	0.0548
0.5	-24	-1.915	2.766	0.3782
0.7	-24	0.921	0.901	0.1297
0.9	-24	0.816	0.438	0.08
-0.7	0	-0.071	0.316	0.025
-0.5	0	-2.059	3.515	1.6579
-0.3	0	-0.228	0.4	0.0246
-0.1	0	0.674	1.006	0.1229
0.1	0	1.957	1.703	0.2912
0.3	0	-0.278	0.457	0.0332
0.5	0	0.802	0.438	0.0425
0.7	0	0.334	0.559	0.0289
0.9	0	0.665	0.454	0.0677
-0.7	24	-0.48	0.77	0.1748
-0.5	24	0.904	0.64	0.1343
-0.3	24	-0.338	0.509	0.0384
-0.1	24	-0.006	0.428	0.0161
0.1	24	-0.076	0.324	0.0215
0.3	24	0.436	1.075	0.0876
0.5	24	-0.18	0.851	0.0469
0.7	24	1.171	0.653	0.1032
0.9	24	0.902	0.593	0.126
-0.9	48	0.738	0.558	0.2399
-0.7	48	-1.097	3.954	4.0016
-0.5	48	0.483	0.406	0.0676
-0.3	48	0.306	0.748	0.0891
-0.1	48	0.092	0.437	0.0209
0.1	48	-0.33	1.528	0.2078
0.3	48	-0.004	0.227	0.0234
0.5	48	1.739	4.153	2.3158
0.7	48	0.149	0.45	0.0186
0.9	48	0.679	0.326	0.0531
-0.9	72	-0.836	0.529	0.2114
-0.7	72	-0.283	0.558	0.0758
-0.5	72	0.195	0.338	0.0344
-0.3	72	0.087	0.264	0.0111
-0.1	72	1.081	2.64	3.1859
0.1	72	0.489	0.334	0.0556
0.3	72	0.186	0.225	0.0226
0.5	72	0.159	0.385	0.0236
0.7	72	0.401	0.265	0.0309
0.9	72	0.643	0.364	0.0705
-0.9	96	0.361	0.533	0.109
-0.7	96	0.334	0.509	0.0777
-0.5	96	-0.995	0.41	0.1092
-0.3	96	-0.048	0.379	0.0059
-0.1	96	0.129	0.169	0.0114
0.1	96	0.283	0.43	0.0538
0.3	96	0.136	0.224	0.0193
0.5	96	0.036	0.23	0.0085
0.7	96	0.323	0.271	0.0267
0.9	96	0.172	0.284	0.0142
-0.9	120	-0.075	0.658	0.0316
-0.7	120	-0.277	0.377	0.0309
-0.5	120	-0.192	0.277	0.0141
-0.3	120	-0.521	0.354	0.0565
-0.1	120	-0.243	0.193	0.0182
0.1	120	0.174	0.3	0.0258
0.3	120	-0.761	0.436	0.1104
0.5	120	0.024	0.186	0.0086
0.7	120	-0.423	0.259	0.0304
0.9	120	0.952	0.495	0.1184
-0.9	144	0.711	1.062	0.3899
-0.7	144	-0.182	0.32	0.014
-0.5	144	-0.054	0.282	0.0078
-0.3	144	-0.43	0.174	0.0194
-0.1	144	-0.768	0.374	0.0793
0.1	144	-0.676	0.262	0.0458
0.3	144	0.054	0.197	0.0157
0.5	144	-0.367	0.36	0.0463
0.7	144	0.056	0.196	0.0049
0.9	144	0.145	0.351	0.0167
-0.9	168	-0.043	0.888	0.0314
-0.7	168	-0.217	0.223	0.0096
-0.5	168	-0.265	0.207	0.0134
-0.3	168	-0.681	0.454	0.0772
-0.1	168	-0.859	0.266	0.0471
0.1	168	-1.071	0.271	0.0525
0.3	168	-0.792	0.236	0.0402
0.5	168	-0.629	0.23	0.0332
0.7	168	-0.431	0.332	0.0426
0.9	168	0.185	0.317	0.018