CLAS Physics Database

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Measurement E40M3

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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 :	1.2 — 1.25 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	0.662	0.285	0.0471
-0.7	-168	-0.008	0.213	0.0023
-0.5	-168	-0.249	0.171	0.0132
-0.3	-168	-0.154	0.261	0.0063
-0.1	-168	-0.727	0.19	0.0497
0.1	-168	-0.441	0.105	0.0163
0.3	-168	-0.586	0.105	0.0217
0.5	-168	-0.451	0.121	0.0185
0.7	-168	-0.362	0.12	0.0118
0.9	-168	-0.153	0.171	0.0089
-0.9	-144	0.217	0.167	0.0102
-0.7	-144	-0.145	0.094	0.007
-0.5	-144	-0.207	0.07	0.0073
-0.3	-144	-0.185	0.071	0.0075
-0.1	-144	-0.363	0.065	0.0121
0.1	-144	-0.404	0.071	0.0149
0.3	-144	-0.461	0.089	0.015
0.5	-144	-0.374	0.098	0.0149
0.7	-144	-0.194	0.129	0.0107
0.9	-144	-0.329	0.235	0.0366
-0.9	-120	0.173	0.105	0.0064
-0.7	-120	-0.113	0.068	0.0049
-0.5	-120	-0.266	0.054	0.0082
-0.3	-120	-0.157	0.048	0.004
-0.1	-120	-0.203	0.049	0.0058
0.1	-120	-0.252	0.049	0.0063
0.3	-120	-0.325	0.063	0.0095
0.5	-120	-0.277	0.093	0.0106
0.7	-120	-0.215	0.128	0.0132
0.9	-120	-0.217	0.173	0.0133
-0.9	-96	-0.016	0.117	0.0038
-0.7	-96	-0.078	0.056	0.0021
-0.5	-96	-0.199	0.05	0.0056
-0.3	-96	-0.245	0.048	0.0067
-0.1	-96	-0.297	0.05	0.0085
0.1	-96	-0.268	0.051	0.0076
0.3	-96	-0.124	0.054	0.0035
0.5	-96	-0.181	0.063	0.0051
0.7	-96	-0.048	0.094	0.0023
0.9	-96	0.34	0.155	0.0278
-0.9	-72	-0.118	0.1	0.0048
-0.7	-72	-0.169	0.063	0.0058
-0.5	-72	-0.258	0.059	0.0077
-0.9	-48	-0.226	0.102	0.0085
-0.9	-24	-0.374	0.167	0.0161
-0.9	0	-0.212	0.137	0.0111
-0.9	24	-0.273	0.104	0.0128
-0.9	48	-0.123	0.083	0.0046
-0.9	72	-0.142	0.089	0.0068
-0.7	72	-0.09	0.055	0.0025
-0.5	72	-0.198	0.05	0.0047
-0.9	96	0.158	0.082	0.0072
-0.7	96	-0.11	0.056	0.0037
-0.5	96	-0.089	0.049	0.0024
-0.3	96	-0.193	0.046	0.0049
-0.1	96	-0.208	0.048	0.0059
0.1	96	-0.234	0.048	0.006
0.3	96	-0.209	0.046	0.005
0.5	96	-0.079	0.055	0.0027
0.7	96	-0.027	0.062	0.0016
0.9	96	0.104	0.142	0.0099
-0.9	120	0.189	0.085	0.0081
-0.7	120	0.033	0.065	0.0015
-0.5	120	-0.091	0.059	0.0036
-0.3	120	-0.275	0.054	0.0089
-0.1	120	-0.203	0.052	0.0066
0.1	120	-0.223	0.054	0.0076
0.3	120	-0.241	0.054	0.0074
0.5	120	-0.242	0.065	0.0092
0.7	120	-0.189	0.087	0.0093
0.9	120	-0.104	0.204	0.0079
-0.9	144	0.175	0.1	0.0064
-0.7	144	0.026	0.081	0.0014
-0.5	144	-0.155	0.072	0.0067
-0.3	144	-0.255	0.071	0.01
-0.1	144	-0.295	0.074	0.0129
0.1	144	-0.368	0.072	0.0141
0.3	144	-0.43	0.076	0.0161
0.5	144	-0.446	0.108	0.0286
0.7	144	-0.408	0.09	0.0222
0.9	144	-0.599	0.281	0.0666
-0.9	168	0.875	0.336	0.089
-0.7	168	0.269	0.151	0.0181
-0.5	168	-0.298	0.127	0.0148
-0.3	168	-0.711	0.14	0.0411
-0.1	168	-0.435	0.178	0.0179
0.1	168	-0.869	0.131	0.0394
0.3	168	-0.501	0.127	0.0215
0.5	168	-0.502	0.142	0.0259
0.7	168	-0.098	0.476	0.0047
0.9	168	-0.251	0.184	0.0129