CLAS Physics Database

Your browser does not support JavaScript or JavaScript is turned off in your browser. It is strongly recommended to turn JavaScript on to view this page. Some features may not work if JavaScript is turned off.

Measurement E40M24

You are not logged in.

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 :	1.1 — 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 view sliced data.

Your browser must support Java to use this feature.
You can find appropriate software at www.java.com

Click here to view 3D plot of the data.

Your must have VRML plugin for your browser installed to see this type of 3D plots.
For some types of browsers you can find it here: www.parallelgraphics.com

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	0.158	0.251	0.0148
-0.7	-168	0.026	0.235	0.002
-0.5	-168	-0.115	0.21	0.0053
-0.3	-168	0.171	0.233	0.0186
-0.1	-168	0.132	0.215	0.0146
0.1	-168	0.03	0.24	0.0038
0.3	-168	0.136	0.315	0.0327
0.5	-168	-0.103	0.183	0.0141
0.7	-168	-0.123	0.152	0.0114
0.9	-168	-0.193	0.213	0.0289
-0.9	-144	0.317	0.242	0.0347
-0.7	-144	-0.565	0.211	0.0543
-0.5	-144	-0.05	0.137	0.0052
-0.3	-144	-0.437	0.181	0.047
-0.1	-144	-0.14	0.137	0.0137
0.1	-144	-0.051	0.125	0.0066
0.3	-144	0.053	0.171	0.0067
0.5	-144	-0.414	0.186	0.0538
0.7	-144	-0.153	0.306	0.0417
0.9	-144	0.012	0.214	0.0026
-0.9	-120	0.004	0.403	0.0092
-0.7	-120	-0.143	0.126	0.0103
-0.5	-120	0.027	0.137	0.006
-0.3	-120	0.077	0.128	0.0078
-0.1	-120	-0.001	0.126	0.0065
0.1	-120	0.132	0.136	0.0128
0.3	-120	-0.239	0.181	0.0347
0.5	-120	0.015	0.152	0.0062
0.7	-120	0.059	0.244	0.0119
0.9	-120	0.633	0.385	0.152
-0.9	-96	-0.589	0.363	0.122
-0.7	-96	-0.144	0.197	0.0164
-0.5	-96	-0.027	0.171	0.0079
-0.9	96	0.076	0.977	0.0332
-0.7	96	-0.191	0.207	0.0265
-0.5	96	0.052	0.194	0.0101
-0.9	120	0.353	0.447	0.1148
-0.7	120	0.11	0.184	0.0124
-0.5	120	-0.147	0.144	0.013
-0.3	120	-0.148	0.193	0.0185
-0.1	120	-0.213	0.203	0.0319
0.1	120	-0.015	0.214	0.0064
0.3	120	-0.04	0.151	0.0071
0.5	120	0.178	0.203	0.0297
0.7	120	-0.771	0.31	0.1407
-0.9	144	0.256	0.228	0.0289
-0.7	144	-0.084	0.201	0.0075
-0.5	144	0.034	0.145	0.004
-0.3	144	0.012	0.186	0.0052
-0.1	144	0.183	0.167	0.0183
0.1	144	-0.298	0.166	0.0326
0.3	144	0.184	0.18	0.0235
0.5	144	-0.189	0.175	0.0194
0.7	144	-0.147	0.122	0.0083
0.9	144	-0.84	0.464	0.2168
-0.9	168	0.104	0.734	0.0579
-0.7	168	-0.432	0.33	0.0572
-0.5	168	0.169	0.189	0.0104
-0.3	168	-0.022	0.189	0.0019
-0.1	168	-0.285	0.288	0.0406
0.1	168	-0.265	0.231	0.0313
0.3	168	-0.01	0.179	0.0004
0.5	168	0.182	0.304	0.0287
0.7	168	0.37	0.338	0.0635
0.9	168	0.001	0.632	0.003