CLAS Physics Database

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Measurement E40M30

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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 :	1.5 — 1.6 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
-0.3	-168	-0.482	0.376	0.0203
-0.1	-168	0.079	1.133	0.0559
0.1	-168	-0.78	0.801	0.159
0.3	-168	-0.078	1.07	0.1153
0.5	-168	0.583	0.782	0.1913
0.7	-168	-1.521	1.999	0.3195
-0.7	-144	-0.06	0.475	0.0324
-0.5	-144	0.343	0.172	0.0256
-0.3	-144	0.535	0.194	0.0378
-0.1	-144	0.673	0.193	0.0428
0.1	-144	0.171	0.144	0.0312
0.3	-144	-0.139	0.35	0.046
0.5	-144	0.43	0.34	0.0777
0.7	-144	0.408	2.078	0.1779
-0.9	-120	0.211	0.294	0.0181
-0.7	-120	1.2	0.446	0.1002
-0.5	-120	0.263	0.155	0.0234
-0.3	-120	0.434	0.111	0.029
-0.1	-120	0.229	0.091	0.0274
0.1	-120	0.411	0.107	0.0361
0.5	-120	0.025	0.237	0.0478
0.7	-120	0.103	0.359	0.056
-0.9	-96	0.738	0.268	0.0944
-0.7	-96	0.437	0.193	0.0472
-0.5	-96	-0.112	0.219	0.0301
-0.3	-96	0.198	0.154	0.0425
-0.1	-96	0.174	0.118	0.0315
0.1	-96	0.371	0.268	0.052
0.3	-96	0.066	0.112	0.0338
0.5	-96	0.303	0.23	0.0501
-0.9	-72	0.125	0.264	0.061
-0.7	-72	-0.186	0.124	0.0675
-0.5	-72	0.017	0.133	0.0654
-0.3	-72	0.156	0.101	0.0505
-0.1	-72	0.002	0.115	0.0446
0.1	-72	-0.077	0.111	0.0367
-0.9	-48	-0.222	0.398	0.0806
-0.7	-48	-0.011	0.152	0.0912
-0.5	-48	0.05	0.113	0.0764
-0.3	-48	-0.199	0.103	0.0678
-0.1	-48	-0.068	0.101	0.053
-0.9	-24	0.177	0.511	0.0475
-0.7	-24	-0.557	0.214	0.0632
-0.5	-24	-0.054	0.156	0.0548
-0.3	-24	-0.364	0.123	0.0516
-0.9	0	1.058	1.273	0.402
-0.7	0	-0.447	0.199	0.0355
-0.5	0	-0.091	0.264	0.0154
-0.3	0	-0.004	0.161	0.0076
-0.9	24	-0.096	0.294	0.053
-0.7	24	-0.157	0.2	0.0598
-0.5	24	-0.085	0.15	0.0556
-0.3	24	0.078	0.124	0.0463
-0.9	48	-0.222	0.424	0.1195
-0.7	48	-0.22	0.235	0.087
-0.5	48	0.166	0.111	0.0745
-0.3	48	0.109	0.082	0.0669
-0.1	48	0.213	0.111	0.0563
-0.9	72	-0.289	0.236	0.072
-0.7	72	-0.152	0.124	0.0632
-0.5	72	-0.106	0.127	0.0599
-0.3	72	-0.021	0.091	0.0537
-0.1	72	-0.05	0.123	0.0411
0.1	72	-0.047	0.097	0.0335
-0.9	96	-0.324	0.207	0.0573
-0.7	96	-1.505	7.927	1.6884
-0.5	96	-0.237	0.17	0.0347
-0.3	96	-0.212	0.092	0.0319
-0.1	96	-0.239	0.088	0.0336
0.1	96	-0.255	0.089	0.0314
0.3	96	-0.37	0.102	0.0378
0.5	96	-0.1	0.129	0.0327
-0.9	120	-0.789	0.355	0.1321
-0.7	120	-0.903	0.632	0.0648
-0.5	120	-0.472	0.119	0.0252
-0.3	120	-0.458	0.08	0.0278
-0.1	120	-0.477	0.083	0.0309
0.1	120	-0.538	0.081	0.0354
0.3	120	-0.395	0.096	0.0395
0.5	120	-0.258	0.123	0.0383
0.7	120	-0.21	0.154	0.0317
-0.5	144	-0.391	0.151	0.0155
-0.3	144	-1.311	1.066	0.134
-0.1	144	-0.552	0.125	0.0294
0.1	144	-0.345	0.121	0.0347
0.3	144	-0.402	0.174	0.0509
0.5	144	-0.634	0.8	0.2009
0.7	144	-0.44	0.287	0.0859
-0.3	168	-0.055	0.418	0.0291
-0.1	168	-0.179	0.224	0.0166
0.1	168	-0.401	0.177	0.035
0.3	168	0.078	0.199	0.0209
0.5	168	-0.702	2.779	0.1022
0.7	168	0.112	4.555	0.105