CLAS Physics Database

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Measurement E40M23

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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 :	1.5 — 1.6 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
0.3	-168	0.533	0.605	0.0738
0.5	-168	4.404	4.626	0.987
0.7	-168	1.887	4.986	1.9846
-0.3	-144	2.836	2.909	0.4929
-0.1	-144	0.203	0.433	0.0926
0.1	-144	0.476	0.666	0.0891
0.3	-144	0.692	0.403	0.0807
0.5	-144	0.686	1.212	0.1168
0.7	-144	-0.063	0.308	0.0079
0.9	-144	0.277	3.419	0.0629
-0.9	-120	-0.059	1.384	0.0204
-0.7	-120	1.062	0.724	0.073
-0.5	-120	0.859	0.65	0.0805
-0.3	-120	0.931	0.424	0.0759
-0.1	-120	0.082	2.814	0.1472
0.1	-120	1.354	0.718	0.1436
0.3	-120	0.432	0.651	0.1148
0.5	-120	1.716	1.04	0.2367
0.7	-120	0.027	0.444	0.0515
-0.9	-96	-2.177	3.197	0.8951
-0.7	-96	1.218	1.361	0.214
-0.5	-96	-0.201	0.806	0.0811
-0.3	-96	0.514	0.643	0.0843
-0.1	-96	0.154	0.307	0.0747
0.1	-96	0.557	0.376	0.0756
0.3	-96	-0.182	0.283	0.058
0.5	-96	0.414	0.373	0.0603
0.7	-96	0.933	0.924	0.1792
-0.9	-72	0.689	3.955	0.2384
-0.7	-72	-1.472	2.213	0.4725
-0.5	-72	0.784	0.373	0.075
-0.3	-72	0.446	0.286	0.0794
-0.1	-72	0.267	0.405	0.0722
0.1	-72	0.636	0.501	0.0832
0.3	-72	0.448	0.463	0.0624
0.5	-72	1.059	0.65	0.098
-0.9	-48	-1.362	3.361	0.6195
-0.7	-48	0.71	0.427	0.0593
-0.5	-48	-0.3	0.33	0.078
-0.3	-48	0.11	0.402	0.0857
-0.1	-48	0.484	0.323	0.0785
0.1	-48	0.138	0.337	0.0743
-0.9	-24	-1.317	7.812	0.241
-0.7	-24	-0.799	0.86	0.1037
-0.5	-24	-0.938	0.644	0.1094
-0.3	-24	-0.123	0.296	0.0976
-0.1	-24	-0.019	0.299	0.1011
-0.5	0	-0.616	1.136	0.1613
-0.3	0	0.441	0.232	0.0904
-0.1	0	0.615	0.193	0.0944
-0.7	24	0.542	0.433	0.0378
-0.5	24	-2.044	1.957	0.4938
-0.3	24	1.098	3.507	0.1484
-0.1	24	-0.048	0.327	0.0928
-0.9	48	1.194	2.388	0.2891
-0.5	48	1.53	0.924	0.2031
-0.3	48	0.346	0.248	0.0835
-0.1	48	0.677	0.43	0.0879
0.1	48	0.427	0.189	0.087
-0.9	72	-0.098	0.654	0.0427
-0.7	72	0.382	0.42	0.0681
-0.5	72	0.374	0.343	0.0716
-0.3	72	0.282	0.269	0.0752
-0.1	72	0.193	0.247	0.0774
0.1	72	0.279	0.202	0.071
0.3	72	-0.096	0.761	0.0844
0.5	72	0.848	0.564	0.0743
-0.9	96	-0.248	0.396	0.02
-0.7	96	0.174	0.498	0.074
-0.5	96	0.297	0.441	0.0883
-0.3	96	0.563	0.324	0.0795
0.1	96	0.505	0.455	0.0709
0.3	96	-0.557	6.813	0.1953
0.5	96	0.704	0.317	0.0492
0.9	96	-0.183	0.444	0.0431
-0.9	120	0.261	0.663	0.0352
-0.7	120	1.172	0.766	0.0926
-0.5	120	0.385	0.446	0.0916
-0.3	120	0.46	0.28	0.0787
-0.1	120	0.591	0.495	0.0879
0.1	120	-0.595	5.438	0.27
0.3	120	0.387	0.413	0.0622
0.5	120	0.616	0.308	0.0528
0.7	120	-0.153	0.69	0.0763
-0.3	144	-0.95	9.358	0.1837
-0.1	144	0.444	0.333	0.0825
0.1	144	0.212	0.469	0.09
0.3	144	0.547	0.423	0.0801
0.5	144	1.101	1.081	0.1831
0.7	144	0.977	3.115	0.9686
0.9	144	2.757	6.886	4.576
0.3	168	0.318	0.545	0.0744
0.5	168	1.869	1.722	0.3803
0.7	168	-0.696	8.914	0.4405