CLAS Physics Database

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Measurement E40M6

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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 :	1.4 — 1.5 GeV

Select data slice:
cos(θ) = dimensionless

Observable quantity measured (Y axis): A_et, 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_et, dimensionless	Data errors, dimensionless	Systematic errors, dimensionless
0.1	-168	1.722	1.33	0.2344
0.3	-168	-12.76	82.645	21.19
0.5	-168	-0.695	3.319	35.6836
0.7	-168	0.777	0.552	0.1697
-0.9	-144	0	0.457	0.0106
-0.7	-144	0.565	0.295	0.0413
-0.5	-144	0.175	0.293	0.0108
-0.3	-144	0.632	0.195	0.0404
-0.1	-144	0.043	0.226	0.0123
0.1	-144	0.622	0.238	0.0436
0.3	-144	0.463	0.237	0.0328
0.5	-144	1.145	0.662	0.2682
0.7	-144	-0.445	0.504	0.1401
-0.9	-120	0.589	0.624	0.1807
-0.7	-120	0.155	0.178	0.0161
-0.5	-120	0.263	0.239	0.015
-0.3	-120	0.072	0.235	0.0044
-0.1	-120	0.224	0.127	0.0165
0.1	-120	0.168	0.167	0.0177
0.3	-120	0.213	0.177	0.0222
0.5	-120	0.945	0.594	0.3892
0.7	-120	0.614	0.347	0.1013
-0.9	-96	2.313	3.882	4.1001
-0.7	-96	0.61	0.185	0.0514
-0.5	-96	0.27	0.186	0.0213
-0.3	-96	0.122	0.141	0.02
-0.1	-96	-0.034	0.179	0.0152
0.1	-96	0.167	0.163	0.014
0.3	-96	0.03	0.156	0.0141
0.5	-96	0.299	0.258	0.043
-0.9	-72	-0.152	0.42	0.0535
-0.7	-72	0.123	0.208	0.019
-0.5	-72	0.309	0.136	0.022
-0.3	-72	0.21	0.131	0.0166
-0.1	-72	-0.012	0.136	0.0118
0.1	-72	0.465	0.167	0.0335
-0.9	-48	-6.283	40.408	4.3296
-0.7	-48	-0.262	0.235	0.0497
-0.5	-48	0.025	0.17	0.0185
-0.3	-48	0.078	0.164	0.016
-0.9	-24	3.436	18.792	2.0052
-0.7	-24	-0.051	0.343	0.026
-0.5	-24	0.07	0.449	0.0154
-0.3	-24	0.02	0.298	0.017
-0.9	0	1.4	9.339	1.1895
-0.7	0	-0.184	0.433	0.0353
-0.5	0	-0.876	0.565	0.1974
-0.9	24	6.742	242.919	6.5834
-0.7	24	-0.147	0.232	0.0259
-0.5	24	0.309	0.285	0.0483
-0.3	24	-0.755	0.728	0.2935
-0.9	48	-0.094	0.453	0.0462
-0.7	48	0.121	0.254	0.0206
-0.5	48	0.189	0.197	0.021
-0.3	48	-0.321	0.153	0.027
-0.9	72	0.537	0.578	0.225
-0.7	72	0.027	0.193	0.0222
-0.5	72	0.024	0.131	0.0109
-0.3	72	0.053	0.167	0.0122
-0.1	72	-0.12	0.125	0.0104
0.1	72	0.08	0.151	0.0137
-0.9	96	0.863	0.289	0.1155
-0.7	96	0.75	0.347	0.1089
-0.5	96	0.176	0.214	0.0131
-0.3	96	0.022	0.176	0.0057
-0.1	96	0.49	0.148	0.0287
0.1	96	0.294	0.148	0.0238
0.3	96	0.027	0.138	0.0096
0.5	96	-0.077	0.205	0.0097
-0.9	120	0.563	0.403	0.1441
-0.7	120	0.711	0.411	0.0712
-0.5	120	0.073	0.232	0.0077
-0.3	120	0.369	0.177	0.0201
-0.1	120	0.069	0.14	0.0134
0.1	120	0.238	0.128	0.0151
0.3	120	0.248	0.169	0.0231
0.5	120	0.451	0.196	0.0497
0.7	120	0.318	1.529	2.7116
-0.9	144	0.179	0.353	0.0443
-0.7	144	1.271	0.611	0.11
-0.5	144	0.435	0.274	0.0214
-0.3	144	0.249	0.165	0.0137
-0.1	144	0.337	0.231	0.0219
0.1	144	0.093	0.302	0.015
0.3	144	0.643	0.726	0.0742
0.5	144	0.473	0.253	0.045
0.7	144	0.215	0.909	0.0985
-0.9	168	0.423	0.974	0.2105
0.1	168	1.073	0.43	0.0967
0.3	168	0.346	0.278	0.0548
0.5	168	1.437	12.775	0.2063
0.7	168	0.104	3.198	1.2203