CLAS Physics Database

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Measurement E40M41

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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 :	1.15 — 1.2 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 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	-0.072	0.145	0.0049
-0.7	-168	-0.033	0.106	0.0024
-0.5	-168	-0.096	0.114	0.0055
-0.3	-168	-0.19	0.113	0.0092
-0.1	-168	-0.176	0.097	0.0069
0.1	-168	-0.101	0.111	0.0052
0.3	-168	-0.064	0.11	0.0048
0.5	-168	0.077	0.128	0.0052
0.7	-168	-0.247	0.1	0.0102
0.9	-168	-0.013	0.102	0.0011
-0.9	-144	-0.198	0.115	0.0099
-0.7	-144	-0.155	0.139	0.0105
-0.5	-144	-0.195	0.104	0.0108
-0.3	-144	-0.397	0.111	0.0205
-0.1	-144	-0.305	0.093	0.0151
0.1	-144	-0.181	0.084	0.0095
0.3	-144	-0.11	0.076	0.0076
0.5	-144	-0.308	0.092	0.0155
0.7	-144	-0.169	0.083	0.0083
0.9	-144	-0.196	0.098	0.0096
-0.9	-120	-0.36	0.137	0.0246
-0.7	-120	-0.195	0.087	0.008
-0.5	-120	-0.174	0.081	0.0077
-0.3	-120	-0.227	0.071	0.0085
-0.1	-120	-0.23	0.068	0.0088
0.1	-120	-0.216	0.059	0.0078
0.3	-120	-0.238	0.059	0.0083
0.5	-120	-0.168	0.056	0.0065
0.7	-120	-0.377	0.082	0.0175
0.9	-120	-0.058	0.092	0.0032
-0.9	-96	-0.161	0.122	0.0111
-0.7	-96	0.028	0.089	0.0041
-0.5	-96	-0.207	0.079	0.008
-0.3	-96	-0.167	0.079	0.0075
-0.1	-96	-0.114	0.072	0.0051
0.1	-96	-0.291	0.063	0.0098
0.3	-96	-0.098	0.06	0.0039
0.5	-96	-0.195	0.06	0.006
0.7	-96	-0.256	0.092	0.0129
0.9	-96	-0.16	0.101	0.0069
-0.9	-72	-0.006	0.128	0.0032
-0.7	-72	-0.071	0.099	0.005
-0.5	-72	-0.066	0.094	0.0047
-0.3	-72	-0.019	0.074	0.0031
-0.1	-72	-0.111	0.069	0.0045
0.1	-72	-0.078	0.069	0.0033
0.3	-72	-0.02	0.08	0.002
0.5	-72	-0.306	0.08	0.0119
0.7	-72	-0.181	0.111	0.0127
0.9	-72	-0.099	0.113	0.0053
-0.9	-48	-0.015	0.119	0.0027
-0.7	-48	0.026	0.095	0.0034
-0.5	-48	0.063	0.106	0.0046
-0.3	-48	-0.022	0.106	0.0036
-0.1	-48	-0.016	0.143	0.0035
0.1	-48	-0.165	0.146	0.008
0.3	-48	0.056	0.165	0.0034
0.5	-48	-0.252	0.124	0.009
0.7	-48	0.013	0.106	0.0019
0.9	-48	-0.019	0.121	0.0036
-0.9	-24	0.003	0.127	0.0007
-0.7	-24	-0.041	0.1	0.0031
-0.5	-24	0.29	0.18	0.0235
-0.3	-24	0.127	0.218	0.0099
-0.1	-24	-0.2	0.362	0.0265
0.1	-24	-0.666	0.668	0.1061
0.3	-24	-0.056	0.201	0.0035
0.5	-24	-0.055	0.173	0.0036
0.7	-24	0.164	0.277	0.0116
0.9	-24	-0.175	0.119	0.0086
-0.9	0	-0.288	0.161	0.0412
-0.7	0	0.032	0.165	0.0041
-0.5	0	0.227	0.13	0.01
-0.3	0	0.377	0.304	0.0382
-0.1	0	-0.214	0.148	0.0063
0.1	0	-0.105	0.585	0.0182
0.3	0	-0.012	0.235	0.0006
0.5	0	0.384	0.472	0.0381
0.7	0	-0.317	0.252	0.0212
0.9	0	0.206	0.329	0.0366
-0.9	24	0.088	0.115	0.0076
-0.7	24	-0.066	0.119	0.0056
-0.5	24	-0.152	0.177	0.0153
-0.3	24	-0.113	0.151	0.006
-0.1	24	0.316	0.417	0.0436
0.1	24	-0.401	0.204	0.0186
0.3	24	-0.075	0.313	0.0067
0.5	24	0.057	0.174	0.0029
0.7	24	-0.233	0.191	0.0131
0.9	24	-0.266	0.157	0.021
-0.9	48	0.074	0.126	0.0067
-0.7	48	0.116	0.088	0.0068
-0.5	48	-0.067	0.094	0.0049
-0.3	48	-0.04	0.111	0.0039
-0.1	48	0.062	0.126	0.0046
0.1	48	-0.072	0.099	0.0034
0.3	48	0.065	0.157	0.0045
0.5	48	-0.067	0.107	0.0027
0.7	48	0.334	0.196	0.0271
0.9	48	0.143	0.136	0.01
-0.9	72	-0.153	0.123	0.0123
-0.7	72	-0.211	0.085	0.0112
-0.5	72	-0.059	0.076	0.0044
-0.3	72	-0.056	0.072	0.0038
-0.1	72	-0.012	0.07	0.0027
0.1	72	0.045	0.068	0.0027
0.3	72	-0.002	0.074	0.002
0.5	72	0.099	0.078	0.0044
0.7	72	0.234	0.106	0.013
0.9	72	-0.08	0.104	0.005
-0.9	96	0.15	0.107	0.0087
-0.7	96	0.036	0.097	0.0042
-0.5	96	0.181	0.074	0.0073
-0.3	96	0.017	0.066	0.0031
-0.1	96	0.115	0.067	0.005
0.1	96	0.115	0.067	0.0048
0.3	96	0.08	0.058	0.0035
0.5	96	0.067	0.067	0.0037
0.7	96	0.101	0.091	0.0056
0.9	96	0.174	0.098	0.0059
-0.9	120	0.178	0.14	0.0131
-0.7	120	-0.047	0.106	0.0051
-0.5	120	0.12	0.075	0.0063
-0.3	120	0.166	0.076	0.0081
-0.1	120	0.229	0.066	0.0084
0.1	120	0.199	0.072	0.0087
0.3	120	0.052	0.066	0.0051
0.5	120	0.066	0.07	0.0056
0.7	120	-0.027	0.079	0.0052
0.9	120	-0.003	0.098	0.0026
-0.9	144	0.004	0.128	0.0024
-0.7	144	0.231	0.121	0.0126
-0.5	144	0.091	0.114	0.0081
-0.3	144	0.183	0.091	0.0103
-0.1	144	0.083	0.076	0.0076
0.1	144	0.197	0.081	0.0101
0.3	144	0.177	0.088	0.0102
0.5	144	0.082	0.085	0.0065
0.7	144	0.047	0.08	0.0051
0.9	144	-0.022	0.092	0.0027
-0.9	168	0.278	0.199	0.027
-0.7	168	0.225	0.15	0.0135
-0.5	168	0.021	0.139	0.0042
-0.3	168	0.026	0.095	0.0039
-0.1	168	0.119	0.113	0.0064
0.1	168	0.193	0.131	0.0112
0.3	168	0.168	0.102	0.0069
0.5	168	-0.129	0.095	0.0052
0.7	168	0.017	0.111	0.0022
0.9	168	-0.035	0.094	0.0017