CLAS Physics Database

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Measurement E40M7

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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 :	1.5 — 1.6 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
-0.3	-168	0.793	0.688	0.0794
-0.1	-168	0.91	2.179	0.2641
0.1	-168	0.135	0.868	0.0888
0.3	-168	0.889	2.153	0.4678
0.5	-168	0.659	1.097	0.3303
0.7	-168	1.88	1.106	0.535
-0.9	-144	0.197	0.732	0.078
-0.5	-144	0.469	0.224	0.0786
-0.3	-144	0.56	0.272	0.0779
-0.1	-144	0.823	0.277	0.072
0.1	-144	0.376	0.205	0.069
0.3	-144	0.822	0.588	0.1495
0.5	-144	0.385	0.449	0.0958
0.7	-144	0.466	0.967	0.2573
-0.9	-120	-0.692	0.442	0.111
-0.7	-120	-0.384	0.395	0.0453
-0.5	-120	0.662	0.227	0.0695
-0.3	-120	0.174	0.145	0.0602
-0.1	-120	0.204	0.124	0.0557
0.1	-120	0.087	0.139	0.0511
0.3	-120	1.775	19.528	0.3476
0.5	-120	0.534	0.363	0.1084
0.7	-120	-0.916	0.645	0.3438
-0.9	-96	0.638	0.309	0.0761
-0.7	-96	0.399	0.253	0.0512
-0.5	-96	-0.148	0.304	0.0494
-0.3	-96	0.307	0.214	0.0615
-0.1	-96	0.026	0.161	0.0422
0.1	-96	0.104	0.23	0.0428
0.3	-96	0.15	0.156	0.0415
0.5	-96	0.626	0.344	0.1263
-0.9	-72	-0.015	0.361	0.0098
-0.7	-72	0.336	0.183	0.0392
-0.5	-72	0.281	0.192	0.0528
-0.3	-72	0.038	0.138	0.042
-0.1	-72	0.101	0.162	0.0487
0.1	-72	0.259	0.148	0.0408
-0.9	-48	0.023	0.571	0.0386
-0.7	-48	0.343	0.227	0.0572
-0.5	-48	-0.009	0.157	0.029
-0.3	-48	-0.089	0.149	0.058
-0.1	-48	0.363	0.147	0.0544
-0.9	-24	-0.417	0.727	0.0591
-0.7	-24	0.158	0.293	0.0467
-0.5	-24	-0.219	0.227	0.0543
-0.3	-24	-0.256	0.179	0.0582
-0.9	0	0.308	1.03	0.1799
-0.7	0	-0.201	0.277	0.0604
-0.5	0	-0.542	0.413	0.0914
-0.3	0	-0.349	0.233	0.0657
-0.9	24	-0.35	0.408	0.0659
-0.7	24	-0.054	0.248	0.047
-0.5	24	0.305	0.214	0.0531
-0.3	24	-0.109	0.172	0.0504
-0.9	48	0.049	0.594	0.0956
-0.7	48	-0.842	0.371	0.1281
-0.5	48	-0.441	0.156	0.0464
-0.3	48	-0.098	0.113	0.0548
-0.1	48	-0.277	0.148	0.0571
-0.9	72	-0.202	0.323	0.0207
-0.7	72	-0.291	0.175	0.0375
-0.5	72	-0.023	0.183	0.042
-0.3	72	-0.135	0.128	0.0515
-0.1	72	-0.177	0.174	0.043
0.1	72	0.198	0.139	0.0401
-0.9	96	-0.102	0.29	0.0325
-0.7	96	1.647	8.775	1.8509
-0.5	96	-0.238	0.255	0.0581
-0.3	96	0.342	0.139	0.0461
-0.1	96	0.212	0.129	0.049
0.1	96	0.057	0.129	0.0426
0.3	96	0.262	0.149	0.0472
0.5	96	0.115	0.186	0.041
-0.9	120	0.335	0.457	0.0851
-0.7	120	-0.375	1.93	0.1183
-0.5	120	-0.164	0.175	0.0643
-0.3	120	0.24	0.12	0.0604
-0.1	120	0.255	0.123	0.0552
0.1	120	0.053	0.115	0.0498
0.3	120	0.485	0.149	0.0559
0.5	120	0.125	0.18	0.0373
0.7	120	-0.063	0.228	0.0219
-0.9	144	0.33	0.563	0.0883
-0.5	144	0.366	0.219	0.0805
-0.3	144	-0.401	0.55	0.0648
-0.1	144	0.267	0.187	0.0692
0.1	144	0.543	0.185	0.0699
0.3	144	0.274	0.258	0.0708
0.5	144	0.995	0.584	0.2273
0.7	144	0.022	0.419	0.0291
-0.3	168	0.694	0.886	0.1224
-0.1	168	0.454	0.373	0.0862
0.1	168	0.911	0.295	0.0964
0.3	168	0.604	0.312	0.1065
0.5	168	-0.504	4.207	0.1497
0.7	168	2.113	21.297	0.4413