CLAS Physics Database

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Measurement E40M32

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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 :	1.1 — 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	-1.102	1.166	0.7826
-0.7	-168	0.192	0.362	0.0327
-0.5	-168	-0.273	0.176	0.0181
-0.3	-168	-0.019	0.2	0.0022
-0.1	-168	-0.255	0.217	0.0269
0.1	-168	0.138	0.19	0.0112
0.3	-168	0.185	0.239	0.0214
0.5	-168	0.202	0.14	0.0112
0.7	-168	0.023	0.177	0.0017
0.9	-168	-0.074	0.261	0.0106
-0.9	-144	1.971	6.53	7.6952
-0.7	-144	0.016	0.165	0.0035
-0.5	-144	-0.183	0.157	0.0124
-0.3	-144	0.016	0.125	0.0043
-0.1	-144	-0.106	0.16	0.0106
0.1	-144	-0.154	0.172	0.0162
0.3	-144	-0.094	0.134	0.0078
0.5	-144	0.049	0.156	0.0046
0.7	-144	-0.133	0.163	0.0118
0.9	-144	0.194	0.255	0.0249
-0.9	-120	0.56	0.405	0.1285
-0.7	-120	-0.166	0.212	0.0189
-0.5	-120	0.108	0.181	0.0103
-0.3	-120	-0.265	0.117	0.0146
-0.1	-120	0.283	0.21	0.0305
0.1	-120	-0.117	0.164	0.0141
0.3	-120	-0.074	0.165	0.0103
0.5	-120	-0.087	0.233	0.0157
0.7	-120	-0.154	0.207	0.0203
0.9	-120	0.006	0.168	0.0036
-0.9	-96	-0.021	0.16	0.0072
-0.7	-96	0.201	0.359	0.0446
-0.5	-96	0.022	0.226	0.008
-0.3	-96	0.039	0.245	0.0095
-0.1	-96	-0.064	0.149	0.0097
0.1	-96	-0.35	0.254	0.0576
0.3	-96	0.07	0.149	0.0099
0.5	-96	-0.241	0.179	0.0265
0.7	-96	0.083	0.335	0.0187
0.9	-96	-0.08	0.128	0.0069
-0.9	-72	0.278	0.915	0.2944
-0.7	-72	1.224	0.911	0.2976
-0.9	48	-0.199	0.409	0.0556
-0.9	72	-0.184	0.154	0.018
-0.7	72	-0.243	0.28	0.0357
-0.9	96	0.111	0.307	0.0289
-0.7	96	0.107	0.222	0.017
-0.5	96	0.771	0.902	0.4644
-0.3	96	-0.093	0.226	0.016
-0.1	96	-0.279	0.13	0.0209
0.1	96	-0.412	0.293	0.086
0.3	96	0.094	0.214	0.0173
0.5	96	0.102	0.293	0.0262
0.7	96	-0.032	0.205	0.0078
0.9	96	-0.546	0.329	0.1126
-0.9	120	0.31	0.345	0.0697
-0.7	120	0.464	0.24	0.0513
-0.5	120	-0.019	0.152	0.0063
-0.3	120	-0.091	0.16	0.0098
-0.1	120	0.09	0.141	0.0103
0.1	120	-0.068	0.164	0.0092
0.3	120	-0.106	0.205	0.0142
0.5	120	-0.297	0.214	0.0381
0.7	120	0.166	0.296	0.0323
0.9	120	-0.414	0.26	0.064
-0.9	144	-0.208	0.226	0.0288
-0.7	144	0.085	0.306	0.0151
-0.5	144	0.068	0.207	0.0085
-0.3	144	-0.285	0.159	0.0211
-0.1	144	0.155	0.152	0.0125
0.1	144	0.125	0.374	0.0376
0.3	144	-0.069	0.137	0.0056
0.5	144	0.107	0.158	0.0095
0.7	144	0.223	0.291	0.0383
0.9	144	-0.351	0.181	0.0285
-0.9	168	-0.483	0.266	0.0692
-0.7	168	0.086	0.194	0.0064
-0.5	168	0.157	0.224	0.0154
-0.3	168	0.145	0.163	0.0098
-0.1	168	-0.123	0.17	0.0094
0.1	168	0.042	0.195	0.0048
0.3	168	0.28	0.262	0.0368
0.5	168	0.584	0.259	0.0591
0.7	168	0.111	0.137	0.0061
0.9	168	0.092	0.195	0.0087