CLAS Physics Database

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Measurement E151M173

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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 :	0.0291 GeV²
W :	1445 GeV
ε :	0.6382
E_beam :	1.0539 GeV
ε_L:	0.0428

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
0.25	42	-0.3945	0.6331	0.054
0.25	54	-1.27	0.5778	0.1476
0.35	30	-0.3702	0.7974	0.0517
0.35	42	0.3479	0.666	0.0497
0.35	54	0.3812	0.532	0.0527
0.45	30	-0.1198	0.7492	0.0329
0.45	42	-0.1718	0.5961	0.0358
0.45	54	0.9677	0.5368	0.1141
0.45	66	-0.6225	0.7775	0.0769
0.45	246	0.6021	0.628	0.0748
0.45	258	-0.8043	0.691	0.0963
0.55	30	0.6498	0.8258	0.0798
0.55	42	-0.0378	0.6134	0.0303
0.55	54	0.6033	0.6261	0.0749
0.55	150	-0.2429	0.6893	0.0408
0.55	162	-0.6086	0.7555	0.0755
0.55	210	0.2548	0.7826	0.0417
0.55	222	0.1337	0.6341	0.0336
0.55	234	0.3119	0.5396	0.0465
0.55	246	-0.0782	0.5013	0.0313
0.55	258	-0.9618	0.5476	0.1135
0.65	150	-0.6086	0.6441	0.0755
0.65	162	-1.0804	0.5666	0.1265
0.65	174	0.7942	0.6736	0.0952
0.65	210	1.315	0.7497	0.1526
0.65	222	1.5097	0.6113	0.1744
0.65	234	0.2557	0.4713	0.0418
0.65	246	-0.088	0.4223	0.0316
0.65	258	0.2936	0.5863	0.0449
0.75	42	0.3423	0.7818	0.0492
0.75	138	-0.538	0.7177	0.0682
0.75	150	-0.8532	0.6638	0.1016
0.75	162	-0.3002	0.701	0.0455
0.75	174	0.4107	0.7754	0.0555
0.75	210	0.432	0.7911	0.0576
0.75	222	1.1336	0.5853	0.1324
0.75	234	0.6955	0.6009	0.0846
0.75	246	0.0143	0.3823	0.03
0.75	258	-0.49	0.4206	0.0633
0.85	222	1.5746	0.6731	0.1816
0.85	234	0.1928	0.4737	0.0372
0.85	246	0.6323	0.4735	0.0779
0.85	258	0.4873	0.5615	0.063