CLAS Physics Database

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Measurement E40M24

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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_t, dimensionless
Target spin asymmetry A_t=(dσ_t/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_t, 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_t, dimensionless	Data errors, dimensionless	Systematic errors, dimensionless
-0.9	-168	0.158	0.251	0.0148
-0.7	-168	0.026	0.235	0.002
-0.5	-168	-0.115	0.21	0.0053
-0.3	-168	0.171	0.233	0.0186
-0.1	-168	0.132	0.215	0.0146
0.1	-168	0.03	0.24	0.0038
0.3	-168	0.136	0.315	0.0327
0.5	-168	-0.103	0.183	0.0141
0.7	-168	-0.123	0.152	0.0114
0.9	-168	-0.193	0.213	0.0289
-0.9	-144	0.317	0.242	0.0347
-0.7	-144	-0.565	0.211	0.0543
-0.5	-144	-0.05	0.137	0.0052
-0.3	-144	-0.437	0.181	0.047
-0.1	-144	-0.14	0.137	0.0137
0.1	-144	-0.051	0.125	0.0066
0.3	-144	0.053	0.171	0.0067
0.5	-144	-0.414	0.186	0.0538
0.7	-144	-0.153	0.306	0.0417
0.9	-144	0.012	0.214	0.0026
-0.9	-120	0.004	0.403	0.0092
-0.7	-120	-0.143	0.126	0.0103
-0.5	-120	0.027	0.137	0.006
-0.3	-120	0.077	0.128	0.0078
-0.1	-120	-0.001	0.126	0.0065
0.1	-120	0.132	0.136	0.0128
0.3	-120	-0.239	0.181	0.0347
0.5	-120	0.015	0.152	0.0062
0.7	-120	0.059	0.244	0.0119
0.9	-120	0.633	0.385	0.152
-0.9	-96	-0.589	0.363	0.122
-0.7	-96	-0.144	0.197	0.0164
-0.5	-96	-0.027	0.171	0.0079
-0.9	96	0.076	0.977	0.0332
-0.7	96	-0.191	0.207	0.0265
-0.5	96	0.052	0.194	0.0101
-0.9	120	0.353	0.447	0.1148
-0.7	120	0.11	0.184	0.0124
-0.5	120	-0.147	0.144	0.013
-0.3	120	-0.148	0.193	0.0185
-0.1	120	-0.213	0.203	0.0319
0.1	120	-0.015	0.214	0.0064
0.3	120	-0.04	0.151	0.0071
0.5	120	0.178	0.203	0.0297
0.7	120	-0.771	0.31	0.1407
-0.9	144	0.256	0.228	0.0289
-0.7	144	-0.084	0.201	0.0075
-0.5	144	0.034	0.145	0.004
-0.3	144	0.012	0.186	0.0052
-0.1	144	0.183	0.167	0.0183
0.1	144	-0.298	0.166	0.0326
0.3	144	0.184	0.18	0.0235
0.5	144	-0.189	0.175	0.0194
0.7	144	-0.147	0.122	0.0083
0.9	144	-0.84	0.464	0.2168
-0.9	168	0.104	0.734	0.0579
-0.7	168	-0.432	0.33	0.0572
-0.5	168	0.169	0.189	0.0104
-0.3	168	-0.022	0.189	0.0019
-0.1	168	-0.285	0.288	0.0406
0.1	168	-0.265	0.231	0.0313
0.3	168	-0.01	0.179	0.0004
0.5	168	0.182	0.304	0.0287
0.7	168	0.37	0.338	0.0635
0.9	168	0.001	0.632	0.003