CLAS Physics Database

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Measurement E40M39

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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 :	0.317 — 0.452 GeV²
W :	1.6 — 1.7 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	0.889	0.583	0.0657
-0.1	-168	-0.071	0.23	0.0054
0.1	-168	-0.075	0.433	0.0339
0.3	-168	0.187	0.715	0.0218
0.5	-168	0.058	0.356	0.0103
-0.5	-144	0.555	0.584	0.0487
-0.3	-144	-0.036	0.799	0.007
-0.1	-144	0.323	0.292	0.0243
0.1	-144	0.477	0.421	0.0343
0.3	-144	-0.101	0.784	0.0202
0.7	-144	-2.254	2.275	0.5864
-0.7	-120	0.648	0.753	0.0879
-0.5	-120	0.186	0.247	0.0129
-0.3	-120	0.325	0.611	0.0318
-0.1	-120	0.491	0.246	0.0413
0.1	-120	0.507	1.739	0.1109
0.3	-120	0.018	0.308	0.0156
0.5	-120	0.136	0.294	0.0257
0.7	-120	-0.118	0.426	0.0331
-0.9	-96	-0.013	0.351	0.0324
-0.7	-96	0.368	0.443	0.0331
-0.5	-96	0.173	0.274	0.0143
-0.3	-96	-0.026	0.371	0.0208
-0.1	-96	-0.073	0.248	0.0124
0.1	-96	-0.355	0.323	0.0459
0.3	-96	0.066	0.174	0.0045
0.5	-96	0.402	0.415	0.0576
-0.9	-72	-0.389	0.347	0.0411
-0.7	-72	-0.36	0.308	0.0326
-0.5	-72	-0.096	0.44	0.0392
-0.3	-72	0.119	0.195	0.0141
-0.1	-72	0.062	0.205	0.0087
0.1	-72	0.405	0.282	0.0333
0.3	-72	-1.016	1.646	0.632
-0.9	-48	-1.005	3.178	0.1536
-0.7	-48	-0.054	0.232	0.025
-0.5	-48	-0.291	0.291	0.0275
-0.3	-48	-0.026	0.198	0.0226
-0.1	-48	0.183	0.228	0.02
0.1	-48	0.521	0.49	0.0623
-0.9	-24	0.034	0.272	0.0095
-0.7	-24	-0.409	0.214	0.0223
-0.5	-24	1.2	8.324	0.3125
-0.3	-24	-0.038	0.207	0.0136
-0.1	-24	0.156	0.247	0.0255
-0.9	0	0.301	0.483	0.0369
-0.7	0	0.061	0.343	0.0089
-0.5	0	0.104	0.252	0.0126
-0.3	0	0.077	0.176	0.01
-0.1	0	0.049	0.102	0.004
-0.9	24	-0.566	0.571	0.0723
-0.7	24	-0.942	2.022	0.6929
-0.5	24	-0.302	0.279	0.0358
-0.3	24	-0.3	0.973	0.0361
-0.1	24	-0.262	0.173	0.0235
-0.7	48	0.063	0.214	0.0388
-0.5	48	0.18	0.303	0.0243
-0.3	48	-0.1	0.192	0.0278
-0.1	48	0.009	0.14	0.0229
0.1	48	-0.149	0.217	0.0166
-0.9	72	1.205	0.894	0.2021
-0.7	72	-0.25	0.349	0.0505
-0.5	72	0.039	0.215	0.0271
-0.3	72	-0.173	0.23	0.0241
-0.1	72	-0.082	0.165	0.0159
0.1	72	-0.422	0.15	0.0149
0.3	72	0.079	0.542	0.036
-0.9	96	0.372	1.25	0.1012
-0.7	96	-0.199	0.301	0.0176
-0.5	96	-0.356	0.295	0.0217
-0.3	96	0.111	0.304	0.0461
-0.1	96	-0.263	0.226	0.0219
0.1	96	-0.243	0.201	0.014
0.3	96	-0.162	0.442	0.0428
0.5	96	-0.661	0.492	0.1226
-0.7	120	-0.608	0.447	0.0377
-0.5	120	-0.534	0.27	0.0349
-0.3	120	-0.448	0.269	0.0409
-0.1	120	-0.454	0.215	0.0247
0.1	120	-0.371	0.157	0.0192
0.3	120	-0.249	0.224	0.0261
0.5	120	-0.11	0.261	0.0225
0.7	120	-2.009	8.265	0.3552
-0.5	144	-0.585	0.401	0.0437
-0.3	144	-0.475	0.347	0.0351
-0.1	144	-0.647	0.329	0.0493
0.1	144	-0.428	0.23	0.0195
0.3	144	-0.276	0.688	0.0362
0.5	144	-1.31	0.911	0.2949
0.7	144	0.087	0.222	0.0298
-0.3	168	-0.273	0.292	0.0182
-0.1	168	-0.09	0.43	0.0517
0.1	168	-0.208	0.21	0.0132
0.3	168	-0.42	2.993	0.1019
0.5	168	0.132	0.293	0.0278
0.7	168	-0.329	0.375	0.0812