CLAS Physics Database

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Measurement E40M26

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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 :	1.2 — 1.25 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	-0.117	0.18	0.0099
-0.7	-168	-0.003	0.153	0.0062
-0.5	-168	-0.156	0.12	0.0113
-0.3	-168	-0.436	0.14	0.0214
-0.1	-168	-0.291	0.111	0.0216
0.1	-168	-0.176	0.075	0.0104
0.3	-168	-0.075	0.072	0.0069
0.5	-168	-0.259	0.078	0.0123
0.7	-168	-0.204	0.082	0.0081
0.9	-168	0.126	0.125	0.0089
-0.9	-144	-0.026	0.117	0.0064
-0.7	-144	-0.141	0.066	0.0104
-0.5	-144	-0.206	0.048	0.0126
-0.3	-144	-0.273	0.05	0.0162
-0.1	-144	-0.294	0.044	0.0151
0.1	-144	-0.266	0.049	0.0145
0.3	-144	-0.153	0.057	0.0108
0.5	-144	-0.194	0.068	0.0113
0.7	-144	-0.237	0.089	0.0154
0.9	-144	-0.078	0.163	0.0126
-0.9	-120	-0.032	0.075	0.005
-0.7	-120	-0.058	0.048	0.0057
-0.5	-120	-0.189	0.038	0.0087
-0.3	-120	-0.23	0.033	0.0092
-0.1	-120	-0.226	0.034	0.0096
0.1	-120	-0.236	0.034	0.0093
0.3	-120	-0.223	0.045	0.0093
0.5	-120	-0.266	0.064	0.0121
0.7	-120	-0.128	0.088	0.0102
0.9	-120	-0.126	0.121	0.0148
-0.9	-96	-0.015	0.083	0.0034
-0.7	-96	-0.092	0.04	0.0041
-0.5	-96	-0.14	0.035	0.0055
-0.3	-96	-0.145	0.034	0.0057
-0.1	-96	-0.154	0.035	0.0062
0.1	-96	-0.114	0.036	0.0053
0.3	-96	-0.124	0.038	0.0056
0.5	-96	-0.106	0.044	0.0054
0.7	-96	-0.101	0.068	0.0068
0.9	-96	-0.179	0.104	0.0194
-0.9	-72	-0.059	0.071	0.0036
-0.7	-72	-0.044	0.044	0.0021
-0.5	-72	-0.033	0.041	0.0023
-0.9	-48	0.069	0.073	0.0026
-0.9	-24	-0.217	0.12	0.011
-0.9	0	-0.027	0.097	0.0017
-0.9	24	0.038	0.074	0.0026
-0.9	48	-0.143	0.058	0.0062
-0.9	72	-0.072	0.063	0.0037
-0.7	72	0.016	0.039	0.0014
-0.5	72	-0.017	0.035	0.0021
-0.9	96	-0.091	0.058	0.0047
-0.7	96	-0.044	0.04	0.0034
-0.5	96	0.107	0.036	0.0047
-0.3	96	0.113	0.033	0.005
-0.1	96	0.114	0.035	0.0052
0.1	96	0.059	0.034	0.0043
0.3	96	0.075	0.033	0.0045
0.5	96	0.12	0.04	0.0058
0.7	96	0.136	0.046	0.0075
0.9	96	0.085	0.103	0.0155
-0.9	120	0.044	0.061	0.0053
-0.7	120	0.053	0.047	0.0054
-0.5	120	0.105	0.043	0.0071
-0.3	120	0.112	0.039	0.0075
-0.1	120	0.152	0.038	0.0084
0.1	120	0.149	0.039	0.0082
0.3	120	0.07	0.039	0.0066
0.5	120	0.18	0.048	0.0093
0.7	120	0.048	0.063	0.0069
0.9	120	-0.05	0.147	0.0135
-0.9	144	0.174	0.075	0.0109
-0.7	144	0.048	0.059	0.0082
-0.5	144	0.138	0.053	0.0115
-0.3	144	0.244	0.053	0.0148
-0.1	144	0.193	0.054	0.014
0.1	144	0.164	0.052	0.0122
0.3	144	0.098	0.055	0.0099
0.5	144	0.216	0.075	0.0157
0.7	144	-0.075	0.062	0.0085
0.9	144	0.046	0.186	0.0104
-0.9	168	-0.051	0.149	0.0062
-0.7	168	0.012	0.107	0.0058
-0.5	168	0.001	0.089	0.0087
-0.3	168	0.045	0.097	0.0097
-0.1	168	0.213	0.106	0.0127
0.1	168	0.097	0.088	0.0082
0.3	168	0.021	0.083	0.0065
0.5	168	0.007	0.095	0.0047
0.7	168	-0.358	0.252	0.0224
0.9	168	-0.089	0.13	0.0062