CLAS Physics Database

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Measurement E40M9

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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 :	0.317 — 0.452 GeV²
W :	1.1 — 1.15 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
-0.9	-168	2.125	2.191	1.4923
-0.7	-168	0.685	0.555	0.1201
-0.5	-168	-0.065	0.247	0.0067
-0.3	-168	-0.34	0.292	0.032
-0.1	-168	-0.921	0.387	0.0948
0.1	-168	-0.017	0.256	0.0095
0.3	-168	-0.71	0.372	0.0855
0.5	-168	-0.164	0.187	0.0112
0.7	-168	0.033	0.246	0.0049
0.9	-168	-0.03	0.367	0.0062
-0.7	-144	-0.161	0.231	0.0091
-0.5	-144	-0.2	0.225	0.0122
-0.3	-144	-0.213	0.176	0.0114
-0.1	-144	-0.312	0.231	0.0265
0.1	-144	-0.447	0.258	0.0426
0.3	-144	-0.443	0.202	0.0297
0.5	-144	-0.418	0.228	0.0349
0.7	-144	0.167	0.232	0.0137
0.9	-144	0.4	0.362	0.0543
-0.9	-120	-0.287	0.447	0.0702
-0.7	-120	-0.274	0.307	0.0282
-0.5	-120	0.107	0.248	0.0101
-0.3	-120	-0.379	0.17	0.0175
-0.1	-120	-0.075	0.267	0.0098
0.1	-120	-0.442	0.245	0.0413
0.3	-120	-0.144	0.234	0.0145
0.5	-120	-0.459	0.356	0.0659
0.7	-120	0.117	0.293	0.0134
0.9	-120	0.28	0.241	0.0266
-0.9	-96	-0.087	0.225	0.0094
-0.7	-96	0.168	0.477	0.0405
-0.5	-96	-0.515	0.345	0.06
-0.3	-96	0.2	0.345	0.0313
-0.1	-96	-0.326	0.216	0.0232
0.1	-96	-0.489	0.372	0.0771
0.3	-96	0.201	0.208	0.0165
0.5	-96	-0.397	0.265	0.0408
0.7	-96	-1.248	0.716	0.2945
0.9	-96	0.188	0.182	0.0117
-0.9	-72	1.032	1.68	1.125
-0.7	-72	0.568	0.731	0.1419
-0.9	48	0.535	0.651	0.1623
-0.9	72	-0.303	0.223	0.027
-0.7	72	-0.668	0.447	0.0955
-0.9	96	-0.223	0.424	0.0554
-0.7	96	-0.306	0.311	0.0422
-0.5	96	-1.464	1.407	0.8678
-0.3	96	0.263	0.328	0.044
-0.1	96	-0.24	0.186	0.0176
0.1	96	0.178	0.392	0.0384
0.3	96	-0.512	0.322	0.0745
0.5	96	-0.053	0.399	0.0155
0.7	96	0.075	0.288	0.0101
0.9	96	0.248	0.417	0.0503
-0.9	120	0.018	0.426	0.0148
-0.7	120	0.114	0.277	0.0142
-0.5	120	-0.116	0.213	0.0082
-0.3	120	0.074	0.227	0.0087
-0.1	120	-0.369	0.2	0.0264
0.1	120	-0.417	0.246	0.0418
0.3	120	-0.314	0.302	0.0425
0.5	120	-0.43	0.318	0.0575
0.7	120	0.687	0.459	0.1226
0.9	120	0.513	0.38	0.0804
-0.9	144	-0.051	0.318	0.0134
-0.7	144	-0.516	0.462	0.0817
-0.5	144	-0.615	0.32	0.0594
-0.3	144	-0.427	0.235	0.0321
-0.1	144	-0.299	0.208	0.0228
0.1	144	-0.39	0.535	0.1066
0.3	144	-0.296	0.199	0.0224
0.5	144	-0.318	0.222	0.0255
0.7	144	-0.09	0.377	0.0163
0.9	144	0.489	0.27	0.0406
-0.9	168	0.096	0.345	0.0136
-0.7	168	-0.158	0.267	0.0105
-0.5	168	0.083	0.3	0.0113
-0.3	168	-0.468	0.235	0.0307
-0.1	168	-0.568	0.267	0.0458
0.1	168	0.15	0.271	0.017
0.3	168	0.107	0.332	0.0153
0.5	168	-0.787	0.335	0.0795
0.7	168	-0.272	0.191	0.0149
0.9	168	0.231	0.272	0.0231