CLAS Physics Database

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Measurement E40M1

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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 :	1.1 — 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

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	0.353	0.34	0.032
-0.7	-168	0.145	0.328	0.0113
-0.5	-168	-0.547	0.264	0.0235
-0.3	-168	0.046	0.31	0.0088
-0.1	-168	-0.352	0.305	0.0406
0.1	-168	-0.959	0.428	0.1433
0.3	-168	-0.784	0.53	0.1958
0.5	-168	-0.26	0.265	0.0352
0.7	-168	0.32	0.222	0.0286
0.9	-168	-0.336	0.31	0.0483
-0.9	-144	0.276	0.312	0.0291
-0.7	-144	0.019	0.285	0.0026
-0.5	-144	-0.361	0.201	0.0235
-0.3	-144	0.18	0.247	0.0203
-0.1	-144	-0.368	0.202	0.0327
0.1	-144	-0.334	0.182	0.0289
0.3	-144	-0.059	0.237	0.0107
0.5	-144	-0.404	0.268	0.0512
0.7	-144	-0.338	0.453	0.0882
0.9	-144	-0.412	0.292	0.0505
-0.9	-120	-0.57	0.625	0.1731
-0.7	-120	-0.134	0.18	0.0102
-0.5	-120	-0.132	0.191	0.011
-0.3	-120	-0.349	0.181	0.0234
-0.1	-120	-0.14	0.178	0.011
0.1	-120	-0.438	0.195	0.0381
0.3	-120	0.159	0.258	0.0227
0.5	-120	-0.061	0.213	0.0077
0.7	-120	-0.405	0.361	0.0858
0.9	-120	-0.617	0.443	0.1477
-0.9	-96	-0.103	0.447	0.0225
-0.7	-96	0.227	0.284	0.0248
-0.5	-96	-0.171	0.243	0.0142
-0.9	96	-2.671	3.928	1.116
-0.7	96	-0.153	0.292	0.0202
-0.5	96	-0.014	0.267	0.0009
-0.9	120	0.281	0.56	0.0854
-0.7	120	-0.012	0.249	0.0034
-0.5	120	-0.022	0.203	0.0024
-0.3	120	0.241	0.277	0.0314
-0.1	120	-0.501	0.319	0.0753
0.1	120	-0.417	0.32	0.0705
0.3	120	0.128	0.212	0.0128
0.5	120	-0.52	0.301	0.0804
0.7	120	-0.234	0.355	0.0436
0.9	120	0.575	2.41	49.1604
-0.9	144	-0.047	0.29	0.0147
-0.7	144	-0.037	0.284	0.0043
-0.5	144	-0.336	0.206	0.0205
-0.3	144	-0.141	0.269	0.0136
-0.1	144	0.338	0.232	0.0327
0.1	144	-0.189	0.232	0.0222
0.3	144	-0.267	0.246	0.0326
0.5	144	-0.073	0.251	0.0105
0.7	144	-0.102	0.175	0.0067
0.9	144	-0.005	0.461	0.0035
-0.9	168	-0.283	1.037	0.1707
-0.7	168	0.276	0.479	0.0372
-0.5	168	-0.289	0.264	0.0173
-0.3	168	0.051	0.265	0.0076
-0.1	168	-0.051	0.38	0.0108
0.1	168	-0.371	0.341	0.0454
0.3	168	-0.278	0.249	0.0223
0.5	168	-0.626	0.56	0.0968
0.7	168	-1.023	0.513	0.1745
0.9	168	1.26	1.405	0.8699