CLAS Physics Database

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Measurement E40M31

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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 :	1.6 — 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
-0.5	-168	0.219	0.316	0.0241
-0.3	-168	0.793	3.506	0.1406
-0.1	-168	-0.212	0.67	0.0117
0.1	-168	-0.223	0.313	0.0157
0.3	-168	-0.704	0.669	0.0712
0.5	-168	0.841	2.209	0.1897
0.7	-168	0.366	0.456	0.1007
-0.5	-144	-0.126	0.255	0.0153
-0.3	-144	0.504	0.89	0.1247
-0.1	-144	-0.004	0.307	0.0174
0.1	-144	-0.312	0.37	0.0307
0.3	-144	0.339	0.454	0.0431
0.5	-144	0.054	0.281	0.0226
0.7	-144	0.143	0.304	0.0375
-0.7	-120	0.82	0.488	0.0902
-0.5	-120	0.363	0.193	0.0337
-0.3	-120	0.283	0.218	0.0323
-0.1	-120	0.155	0.146	0.0234
0.1	-120	0.567	0.254	0.0515
0.3	-120	0.031	0.237	0.0059
0.5	-120	0.521	0.335	0.0706
0.7	-120	0.008	0.223	0.0282
-0.9	-96	-2.055	4.178	0.9482
-0.7	-96	-0.527	0.398	0.0429
-0.5	-96	0.131	0.388	0.0196
-0.3	-96	0.443	0.22	0.0328
-0.1	-96	0.471	0.186	0.0367
0.1	-96	0.118	0.147	0.0181
0.3	-96	0.331	0.194	0.027
-0.9	-72	-0.586	0.257	0.0618
-0.7	-72	0.052	0.225	0.0216
-0.5	-72	-0.06	0.232	0.0211
-0.3	-72	0.224	0.239	0.025
-0.1	-72	0.322	0.173	0.0267
0.1	-72	0.226	0.168	0.0186
0.3	-72	0.304	0.295	0.0302
-0.9	-48	-0.019	0.209	0.0257
-0.7	-48	-0.205	0.187	0.0307
-0.5	-48	-0.243	0.171	0.0295
-0.3	-48	0.004	0.197	0.025
-0.1	-48	-0.085	0.151	0.0293
0.1	-48	0.137	0.194	0.0231
-0.9	-24	-0.15	0.313	0.0119
-0.7	-24	-0.151	0.152	0.0198
-0.5	-24	-0.03	0.161	0.0174
-0.3	-24	-0.135	0.146	0.0193
-0.1	-24	-0.134	0.157	0.0241
-0.9	0	0.013	0.388	0.0235
-0.7	0	-0.329	0.268	0.0316
-0.5	0	-0.234	0.269	0.0325
-0.3	0	-0.214	0.315	0.0373
-0.1	0	-0.282	0.171	0.0235
-0.9	24	0.57	0.354	0.0531
-0.7	24	-0.187	0.206	0.0235
-0.5	24	0.5	0.278	0.0531
-0.3	24	-0.001	0.267	0.02
-0.1	24	-0.193	0.2	0.0277
-0.9	48	0.648	0.425	0.088
-0.7	48	0.11	0.128	0.0206
-0.5	48	-0.102	0.144	0.0287
-0.3	48	-0.179	0.169	0.0292
-0.1	48	0.076	0.143	0.0272
0.1	48	0.204	0.208	0.0307
-0.9	72	0.122	0.299	0.0209
-0.7	72	0.377	0.18	0.0311
-0.5	72	-0.479	1.015	0.0805
-0.3	72	-0.286	0.195	0.0268
-0.1	72	0.091	0.145	0.0165
0.1	72	-0.194	0.135	0.0104
0.3	72	-0.332	0.192	0.0192
-0.9	96	0.241	0.262	0.0263
-0.7	96	-0.207	0.171	0.0144
-0.5	96	-0.622	0.25	0.043
-0.1	96	-0.172	0.171	0.0308
0.1	96	-0.249	0.161	0.0231
0.3	96	-0.769	0.365	0.0827
-0.7	120	-0.35	0.176	0.0151
-0.5	120	-0.379	0.117	0.0208
-0.3	120	-0.306	0.151	0.0303
-0.1	120	-0.315	0.125	0.0283
0.3	120	-0.339	0.109	0.0153
0.5	120	-0.34	0.156	0.0367
0.7	120	-0.135	0.337	0.0835
-0.5	144	0.215	0.539	0.0531
-0.3	144	-0.433	0.204	0.0229
-0.1	144	0.192	0.282	0.0523
0.1	144	-0.307	0.133	0.0208
0.3	144	-0.36	0.259	0.0498
0.5	144	-0.747	0.249	0.0845
0.7	144	-0.656	0.818	0.4353
-0.5	168	-0.238	0.204	0.0118
-0.3	168	-0.268	0.437	0.0165
-0.1	168	0.081	0.22	0.0403
0.1	168	-0.287	0.19	0.0239
0.3	168	-0.101	0.139	0.0063
0.5	168	-0.288	0.167	0.0286
0.7	168	-0.504	0.287	0.1191