CLAS Physics Database

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Measurement E151M139

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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 :	1385 GeV
ε :	0.6915
E_beam :	1.0539 GeV
ε_L:	0.1402

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	0.6193	0.8849	0.0766
0.35	42	0.3946	0.7938	0.054
0.35	54	2.4539	0.9469	0.2808
0.45	42	-0.5502	0.7211	0.0694
0.45	258	0.4828	0.8275	0.0626
0.55	246	1.3094	0.6706	0.152
0.55	258	0.2653	0.6155	0.0426
0.55	270	0.5008	0.7032	0.0644
0.65	138	-0.8537	0.7061	0.1017
0.65	150	1.1882	0.9256	0.1385
0.65	186	1.1607	0.912	0.1354
0.65	222	1.0403	0.811	0.1221
0.65	234	0.9937	0.6796	0.117
0.65	246	1.1311	0.6517	0.1321
0.65	258	-0.6196	0.4974	0.0766
0.65	270	0.6504	0.5307	0.0798
0.75	138	-0.6556	0.63	0.0804
0.75	150	0.481	0.8168	0.0624
0.75	162	-0.058	0.6439	0.0307
0.75	174	0.7674	0.8234	0.0923
0.75	186	-0.1319	0.776	0.0335
0.75	222	0.1736	0.6529	0.0359
0.75	234	0.0865	0.6258	0.0316
0.75	246	0.4909	0.4893	0.0634
0.75	258	-0.1624	0.4428	0.0352
0.75	270	0.4756	0.6209	0.0619
0.85	138	-0.2143	0.677	0.0387
0.85	150	0.0502	0.7962	0.0305
0.85	162	0.4036	0.7355	0.0549
0.85	174	0.2007	0.7419	0.0377
0.85	186	-0.6845	0.759	0.0835
0.85	234	0.323	0.6058	0.0474
0.85	246	0.1626	0.5068	0.0352
0.85	258	0.5235	0.472	0.0667
0.85	270	0.0742	0.507	0.0312
0.85	282	-0.0876	0.6479	0.0316
0.95	126	0.0366	0.6699	0.0303
0.95	138	1.4567	0.746	0.1684
0.95	246	0.5647	0.6493	0.0709
0.95	258	-0.7117	0.5194	0.0863
0.95	270	-1.0181	0.3907	0.1196