CLAS Physics Database

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Measurement E40M8

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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 :	1.6 — 1.7 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
-0.5	-168	-0.269	0.432	0.0326
-0.3	-168	0.676	1.175	0.0747
-0.1	-168	0.238	1.259	0.0382
0.1	-168	0.61	0.472	0.0349
0.3	-168	0.223	0.707	0.0463
0.5	-168	1.483	0.915	0.1525
0.7	-168	1.08	0.727	0.2979
-0.5	-144	-0.041	0.363	0.009
-0.3	-144	1.63	1.471	0.3082
-0.1	-144	0.185	0.437	0.0181
0.1	-144	-0.079	0.511	0.0207
0.3	-144	-0.136	0.587	0.0308
0.5	-144	0.427	0.386	0.0454
0.7	-144	0.149	0.416	0.0278
-0.7	-120	-0.325	0.479	0.0434
-0.5	-120	-0.898	0.29	0.0611
-0.3	-120	-0.626	0.301	0.0504
-0.1	-120	-0.056	0.197	0.0037
0.1	-120	-0.128	0.307	0.0261
0.3	-120	0.521	0.346	0.0488
0.5	-120	0.49	0.486	0.0625
0.7	-120	0.196	0.314	0.0288
-0.9	-96	0.068	1.123	0.0449
-0.7	-96	-0.443	0.625	0.0417
-0.5	-96	-0.696	0.851	0.0801
-0.3	-96	-0.197	0.266	0.0153
-0.1	-96	0.099	0.231	0.0147
0.1	-96	-0.092	0.202	0.0072
0.3	-96	-0.049	0.252	0.0107
-0.9	-72	-0.381	0.377	0.0358
-0.7	-72	-0.722	0.357	0.0624
-0.5	-72	-0.559	0.365	0.0527
-0.3	-72	-0.442	0.326	0.0308
-0.1	-72	-0.251	0.232	0.0192
0.1	-72	-0.109	0.234	0.0222
0.3	-72	0.764	0.446	0.0899
-0.9	-48	-0.315	0.408	0.0764
-0.7	-48	-0.683	0.369	0.0704
-0.5	-48	-0.964	0.285	0.0739
-0.3	-48	-0.876	0.315	0.0711
-0.1	-48	-0.43	0.217	0.0259
0.1	-48	-0.377	0.27	0.0352
-0.9	-24	-0.597	0.672	0.063
-0.7	-24	-0.402	0.219	0.0243
-0.5	-24	-0.692	0.252	0.0497
-0.3	-24	-0.868	0.237	0.0546
-0.1	-24	-0.25	0.224	0.0169
-0.9	0	-1.49	1.037	0.1458
-0.7	0	-0.917	0.439	0.0814
-0.5	0	-0.73	0.43	0.0768
-0.3	0	-1.754	0.752	0.2713
-0.1	0	-0.396	0.248	0.03
-0.9	24	-0.177	0.417	0.0201
-0.7	24	-0.35	0.297	0.0335
-0.5	24	-0.608	0.356	0.0635
-0.3	24	-0.224	0.377	0.0252
-0.1	24	-0.645	0.305	0.0643
-0.9	48	-0.788	0.586	0.1232
-0.7	48	-0.836	0.194	0.0406
-0.5	48	-0.362	0.211	0.0267
-0.3	48	-1.038	0.296	0.0805
-0.1	48	-0.634	0.215	0.0417
0.1	48	-0.477	0.284	0.0438
-0.9	72	-0.619	0.438	0.0915
-0.7	72	-0.279	0.234	0.0194
-0.5	72	-0.645	0.51	0.0321
-0.3	72	-0.669	0.302	0.0484
-0.1	72	-0.471	0.207	0.021
0.1	72	-0.034	0.196	0.014
0.3	72	-0.21	0.282	0.021
-0.9	96	-0.546	0.359	0.046
-0.7	96	-0.25	0.245	0.0183
-0.5	96	0.01	0.318	0.0126
-0.1	96	-0.084	0.205	0.0132
0.1	96	0.088	0.23	0.0094
0.3	96	-0.012	1.026	0.127
-0.7	120	-0.694	0.262	0.0515
-0.5	120	-0.368	0.165	0.0157
-0.3	120	-0.281	0.194	0.0155
-0.1	120	0.094	0.175	0.0075
0.3	120	0.246	0.162	0.0195
0.5	120	0	0.216	0.0119
0.7	120	-0.425	0.495	0.1401
-0.5	144	0.065	0.654	0.0576
-0.3	144	0.195	0.296	0.0199
-0.1	144	0.331	0.336	0.0274
0.1	144	0.3	0.189	0.0171
0.3	144	0.746	0.386	0.0788
0.5	144	0.658	0.311	0.0641
0.7	144	0.855	1.363	0.2817
-0.5	168	0.025	0.291	0.0051
-0.3	168	0.128	0.5	0.0092
-0.1	168	0.035	0.2	0.0065
0.1	168	0.395	0.276	0.0299
0.3	168	0.647	0.21	0.0372
0.5	168	0.628	0.249	0.054
0.7	168	-0.437	0.381	0.0983