CLAS Physics Database

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Measurement E40M4

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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 :	0.187 — 0.317 GeV²
W :	1.25 — 1.3 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
-0.9	-168	0.259	0.643	0.0411
-0.7	-168	-0.243	0.49	0.0453
-0.5	-168	-0.317	0.316	0.039
-0.9	-144	0.195	0.326	0.0176
-0.7	-144	-0.059	0.133	0.0067
-0.5	-144	-0.278	0.123	0.0214
-0.3	-144	-0.126	0.107	0.009
-0.1	-144	0.027	0.114	0.0052
0.1	-144	-0.415	0.185	0.0266
0.3	-144	-0.221	0.17	0.0119
0.5	-144	-0.266	0.364	0.0291
0.7	-144	-0.042	0.214	0.0062
-0.9	-120	0.19	0.196	0.0148
-0.7	-120	-0.061	0.105	0.0065
-0.5	-120	-0.2	0.082	0.0111
-0.3	-120	-0.129	0.064	0.005
-0.1	-120	-0.166	0.091	0.0096
0.1	-120	-0.222	0.118	0.0123
0.3	-120	-0.057	0.117	0.0038
0.5	-120	-0.385	0.159	0.0256
0.7	-120	-0.167	0.22	0.0201
-0.9	-96	0.289	0.15	0.0244
-0.7	-96	-0.169	0.084	0.0097
-0.5	-96	-0.16	0.073	0.0079
-0.3	-96	-0.333	0.072	0.0164
-0.1	-96	-0.124	0.061	0.0053
0.1	-96	-0.253	0.069	0.0095
0.3	-96	-0.277	0.088	0.011
0.5	-96	-0.332	0.108	0.0129
0.7	-96	-0.15	0.179	0.0147
0.9	-96	-0.075	0.661	0.0304
-0.9	-72	-0.546	0.216	0.0663
-0.7	-72	-0.185	0.079	0.0092
-0.5	-72	-0.217	0.068	0.0093
-0.3	-72	-0.212	0.074	0.0101
-0.9	-48	0.203	0.231	0.0292
-0.7	-48	-0.644	0.137	0.0532
-0.9	-24	-0.347	0.246	0.03
-0.9	0	-0.386	0.261	0.0531
-0.9	24	-0.186	0.156	0.0166
-0.9	48	-0.305	0.145	0.027
-0.7	48	-0.212	0.101	0.0143
-0.9	72	-0.185	0.117	0.0141
-0.7	72	-0.139	0.09	0.0089
-0.5	72	-0.314	0.07	0.0139
-0.3	72	-0.328	0.074	0.0149
-0.9	96	-0.032	0.136	0.0032
-0.7	96	-0.003	0.086	0.0029
-0.5	96	-0.182	0.091	0.0106
-0.3	96	-0.098	0.063	0.0044
-0.1	96	-0.117	0.066	0.0052
0.1	96	-0.181	0.071	0.0086
0.3	96	-0.173	0.069	0.0074
0.5	96	-0.065	0.074	0.0047
0.7	96	-0.047	0.095	0.0058
0.9	96	0.321	0.217	0.0381
-0.9	120	0.221	0.142	0.0213
-0.7	120	0.003	0.101	0.0043
-0.5	120	-0.18	0.093	0.0121
-0.3	120	-0.056	0.088	0.0035
-0.1	120	-0.689	0.388	0.0203
0.1	120	-0.312	0.112	0.0178
0.3	120	-0.242	0.115	0.0143
0.5	120	-0.103	0.116	0.006
0.7	120	-0.431	0.219	0.0529
-0.9	144	0.331	0.322	0.0435
-0.7	144	0.066	0.139	0.0058
-0.5	144	-0.319	0.11	0.0203
-0.3	144	-0.16	0.129	0.0114
-0.1	144	-0.285	0.142	0.0144
0.1	144	-0.608	0.31	0.0478
0.3	144	-0.72	0.208	0.0431
0.5	144	-0.22	0.225	0.0166
0.7	144	-0.389	0.167	0.0288
-0.9	168	0.452	0.26	0.0505
-0.7	168	0.899	0.487	0.2248
-0.5	168	0.36	0.237	0.0363
-0.3	168	0.194	0.392	0.0207
-0.1	168	-0.418	0.228	0.0323