CLAS Physics Database

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Measurement E40M28

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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 :	0.187 — 0.317 GeV²
W :	1.3 — 1.4 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	-0.192	0.342	0.0245
-0.7	-168	0.185	1.527	0.0553
-0.9	-144	-0.333	0.378	0.0743
-0.7	-144	-0.58	0.116	0.0531
-0.5	-144	-0.566	0.126	0.0457
-0.3	-144	-0.362	0.215	0.0313
-0.1	-144	-0.267	0.211	0.0301
0.1	-144	-0.315	0.115	0.0278
0.3	-144	-0.249	0.127	0.0329
0.5	-144	0.071	0.195	0.0162
0.7	-144	-0.5	0.343	0.2059
-0.9	-120	-0.657	0.341	0.1612
-0.7	-120	-0.253	0.094	0.0246
-0.5	-120	-0.432	0.107	0.0469
-0.3	-120	-0.367	0.102	0.0248
-0.1	-120	-0.382	0.168	0.0415
0.1	-120	-0.138	0.108	0.0135
0.3	-120	-0.251	0.093	0.027
0.5	-120	-0.113	0.141	0.0338
0.7	-120	0.154	0.219	0.0294
-0.9	-96	-0.219	0.196	0.0364
-0.7	-96	-0.357	0.089	0.0361
-0.5	-96	-0.221	0.067	0.0196
-0.3	-96	-0.219	0.058	0.0133
-0.1	-96	-0.221	0.065	0.0128
0.1	-96	-0.09	0.093	0.0107
0.3	-96	-0.196	0.12	0.023
0.5	-96	-0.083	0.126	0.0245
0.7	-96	-0.171	0.266	0.0929
-0.9	-72	0.338	0.329	0.1274
-0.7	-72	-0.217	0.096	0.0267
-0.5	-72	-0.185	0.068	0.0161
-0.3	-72	-0.136	0.06	0.0097
-0.1	-72	-0.116	0.065	0.0084
-0.7	-48	0.069	0.102	0.0148
-0.5	-48	0.074	0.092	0.0097
-0.9	-24	-0.237	0.17	0.029
-0.7	-24	-0.039	0.124	0.0091
-0.5	-24	-0.058	0.182	0.0087
-0.9	0	-0.062	0.259	0.0215
-0.7	0	-0.139	0.21	0.0271
-0.9	24	0.202	0.182	0.0393
-0.7	24	0.006	0.151	0.0087
-0.5	24	0.132	0.182	0.0202
-0.9	48	0.485	0.245	0.1323
-0.7	48	0.127	0.094	0.0159
-0.5	48	0.18	0.096	0.0189
-0.9	72	0.106	0.12	0.0187
-0.7	72	0.162	0.098	0.0198
-0.5	72	0.131	0.068	0.0116
-0.3	72	0.041	0.059	0.0051
-0.1	72	-0.027	0.062	0.0023
-0.9	96	0.488	0.184	0.0854
-0.7	96	0.175	0.092	0.018
-0.5	96	0.187	0.085	0.017
-0.3	96	0.161	0.078	0.0118
-0.1	96	0.154	0.074	0.0093
0.1	96	0.044	0.091	0.0053
0.3	96	-0.052	0.084	0.0092
0.5	96	0.019	0.087	0.0185
0.7	96	-0.183	0.121	0.0339
-0.9	120	0.323	0.19	0.0494
-0.7	120	0.536	0.153	0.0661
-0.5	120	0.282	0.136	0.0233
-0.3	120	0.159	0.391	0.0331
-0.1	120	0.052	0.103	0.0026
0.1	120	0.001	0.099	0.0049
0.3	120	0.086	0.108	0.0137
0.5	120	-0.104	0.143	0.0201
0.7	120	-0.252	0.125	0.0364
-0.9	144	0.552	0.327	0.175
-0.7	144	0.526	0.26	0.1065
-0.5	144	0.824	0.579	0.2075
-0.3	144	-0.138	0.173	0.0136
-0.1	144	0.203	0.16	0.0183
0.1	144	0.254	0.174	0.0361
0.3	144	0.039	0.103	0.0141
0.5	144	-0.375	0.12	0.0381
0.7	144	0.168	0.232	0.0608
-0.9	168	0.132	0.362	0.0257
-0.7	168	-0.086	0.219	0.027
0.7	168	0.339	0.473	0.037