CLAS Physics Database

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Measurement E151M97

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Experiment: EG4, 2016

Spokespersons: Xiaochao Zheng

Experiment comment: Final asymmetry results for the ep-> e pi+ (n) channel extracted from CLAS/EG4 data obtained using a longitudinally polarized beam and a longitudinally polarized NH3 target (CAA HS07-02).

No publications available for this experiment

Quantity measured: A_UL,
Target spin asymmetry.
Beam: e, polarization: longitudinal
Target: p (Z=1, A=1), polarization: longitudinal
Final state: π⁺n, polarization: none

Q² :	0.0707 GeV²
W :	1325 GeV
ε :	0.7757
E_beam :	1.0539 GeV
ε_L:	0.216

Select data slice:
cos(θ_π⁺) =

Observable quantity measured (Y axis): A_UL,
Plot measurement data

Parameter (X axis): φ(π⁺), degrees

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Measured data:

cos(θ_π⁺)	φ(π⁺), degrees	A_UL	Data errors	Systematic errors
0.35	30	0.4791	0.7132	0.0622
0.35	42	-0.0505	0.6705	0.0305
0.45	42	0.4631	0.8106	0.0606
0.45	270	0.6451	0.6937	0.0793
0.55	234	-0.8699	0.6866	0.1034
0.55	246	0.4415	0.613	0.0585
0.55	258	-0.2484	0.457	0.0412
0.55	270	0.328	0.5514	0.0479
0.65	138	0.1193	0.8421	0.0329
0.65	234	0.4478	0.6335	0.0591
0.65	246	1.1566	0.4746	0.135
0.65	258	-0.1245	0.4351	0.0332
0.65	270	0.2424	0.4564	0.0407
0.75	126	0.1961	0.7156	0.0374
0.75	138	-1.4977	0.4658	0.173
0.75	150	-0.6404	0.4904	0.0788
0.75	162	0.4381	0.634	0.0582
0.75	174	-0.0339	0.7598	0.0302
0.75	186	-0.2972	0.6605	0.0452
0.75	234	0.0888	0.5145	0.0317
0.75	246	1.0739	0.4564	0.1258
0.75	258	-0.0863	0.443	0.0316
0.75	270	0.2366	0.4053	0.0403
0.75	282	0.2961	0.5458	0.0451
0.85	126	0.3422	0.5934	0.0492
0.85	138	0.3135	0.4721	0.0466
0.85	150	0.2542	0.5587	0.0417
0.85	162	-0.1591	0.5714	0.035
0.85	174	-0.1273	0.5187	0.0333
0.85	186	0.9848	0.8233	0.116
0.85	198	-0.4831	0.6335	0.0626
0.85	234	0.911	0.5483	0.1079
0.85	246	-1.0526	0.3413	0.1235
0.85	258	0.2849	0.4124	0.0442
0.85	270	0.1433	0.4101	0.0341
0.85	282	-0.5758	0.452	0.0721
0.85	294	1.1668	0.738	0.1361
0.95	102	-0.111	0.5647	0.0326
0.95	114	0.8624	0.5717	0.1026
0.95	126	-0.2365	0.5712	0.0403
0.95	138	0.7668	0.615	0.0923
0.95	150	-0.8126	0.458	0.0972
0.95	162	0.2159	0.6295	0.0388
0.95	174	-0.0623	0.6041	0.0308
0.95	270	0.0652	0.4957	0.0309