CLAS Physics Database

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Measurement E40M5

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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 :	1.3 — 1.4 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	0.717	0.573	0.1078
-0.9	-144	-0.388	0.611	0.1122
-0.7	-144	0.202	0.157	0.0148
-0.5	-144	0.156	0.16	0.01
-0.3	-144	-0.129	0.28	0.0228
-0.1	-144	-0.319	0.301	0.0401
0.1	-144	0.086	0.16	0.0066
0.3	-144	-0.475	0.192	0.0594
0.5	-144	-0.112	0.273	0.0299
0.7	-144	-0.227	0.408	0.0865
-0.9	-120	-0.103	0.493	0.0555
-0.7	-120	0.021	0.135	0.006
-0.5	-120	0.273	0.148	0.0265
-0.3	-120	-0.015	0.14	0.0089
-0.1	-120	0.016	0.21	0.0021
0.1	-120	0.06	0.154	0.0101
0.3	-120	-0.265	0.131	0.0226
0.5	-120	-0.104	0.198	0.0213
0.7	-120	-0.204	0.309	0.0667
-0.9	-96	-0.054	0.284	0.0245
-0.7	-96	0.049	0.125	0.005
-0.5	-96	-0.117	0.096	0.0109
-0.3	-96	-0.037	0.082	0.0052
-0.1	-96	-0.108	0.093	0.008
0.1	-96	-0.354	0.136	0.028
0.3	-96	-0.17	0.173	0.0179
0.5	-96	-0.217	0.181	0.0299
0.7	-96	-0.256	0.38	0.1157
-0.9	-72	-0.212	0.42	0.0911
-0.7	-72	-0.262	0.139	0.0307
-0.5	-72	-0.248	0.101	0.0193
-0.3	-72	-0.25	0.087	0.0188
-0.1	-72	-0.282	0.094	0.0186
-0.9	-48	-0.983	24.961	0.8707
-0.7	-48	-0.219	0.142	0.0242
-0.5	-48	-0.481	0.135	0.0467
-0.9	-24	-0.322	0.244	0.0316
-0.7	-24	-0.553	0.188	0.0531
-0.5	-24	-0.352	0.264	0.0416
-0.9	0	-0.724	0.415	0.1655
-0.7	0	-0.708	0.338	0.1394
-0.9	24	-0.163	0.24	0.0232
-0.7	24	-0.283	0.218	0.055
-0.5	24	-0.315	0.252	0.0442
-0.9	48	-0.21	0.288	0.0529
-0.7	48	-0.14	0.13	0.0166
-0.5	48	-0.177	0.13	0.0205
-0.9	72	0.008	0.166	0.0104
-0.7	72	0.19	0.134	0.0249
-0.5	72	-0.177	0.093	0.0124
-0.3	72	-0.106	0.083	0.0097
-0.1	72	-0.261	0.089	0.0178
-0.9	96	-0.036	0.22	0.0104
-0.7	96	0.208	0.125	0.0213
-0.5	96	0.046	0.115	0.0108
-0.3	96	-0.135	0.107	0.0097
-0.1	96	-0.364	0.103	0.0217
0.1	96	-0.373	0.13	0.0302
0.3	96	-0.232	0.121	0.0167
0.5	96	-0.119	0.123	0.0149
0.7	96	-0.071	0.175	0.016
0.9	96	0.532	0.844	0.4529
-0.9	120	0.249	0.259	0.0664
-0.7	120	0.252	0.181	0.031
-0.5	120	0.066	0.178	0.0096
-0.3	120	-1.387	1.666	0.3423
-0.1	120	0.087	0.141	0.0087
0.1	120	-0.093	0.14	0.0105
0.3	120	-0.476	0.153	0.0423
0.5	120	-0.426	0.205	0.0532
0.7	120	-0.204	0.181	0.0292
-0.9	144	0.751	0.452	0.2861
-0.7	144	0.857	0.35	0.2012
-0.5	144	0.479	0.545	0.1041
-0.3	144	0.217	0.242	0.0143
-0.1	144	-0.178	0.215	0.02
0.1	144	-0.341	0.239	0.0522
0.3	144	-0.391	0.15	0.0329
0.5	144	-0.155	0.172	0.0225
0.7	144	0.049	0.307	0.0104
-0.9	168	0.397	0.486	0.1029
-0.7	168	0.374	0.319	0.0594
-0.5	168	0.747	0.837	0.2522
0.5	168	-0.408	0.49	0.0491
0.7	168	0.435	0.664	0.0394