CLAS Physics Database

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Measurement E151M80

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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 :	0.1715 GeV²
W :	1295 GeV
ε :	0.7055
E_beam :	1.0539 GeV
ε_L:	0.4546

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
0.45	270	1.3027	0.6297	0.1512
0.55	258	0.1364	0.6819	0.0338
0.55	270	0.3666	0.7057	0.0514
0.55	282	0.0579	0.6568	0.0307
0.65	246	-0.254	0.6422	0.0417
0.65	258	0.1083	0.6128	0.0324
0.65	270	-0.4632	0.5551	0.0606
0.65	282	-0.0767	0.595	0.0312
0.75	126	-0.7031	0.7034	0.0854
0.75	138	0.4187	0.7535	0.0563
0.75	246	-1.1322	0.5502	0.1323
0.75	258	-1.1102	0.4595	0.1298
0.75	270	0.5476	0.71	0.0691
0.75	282	-0.2963	0.5865	0.0451
0.85	114	0.0112	0.6836	0.03
0.85	126	0.4948	0.5632	0.0638
0.85	138	-0.23	0.6764	0.0398
0.85	150	-0.7617	0.5486	0.0917
0.85	162	-0.5002	0.6375	0.0643
0.85	246	-0.2552	0.6087	0.0417
0.85	258	-0.705	0.5133	0.0856
0.85	270	0.2387	0.5109	0.0405
0.85	282	-0.0828	0.5574	0.0314
0.85	294	0.1632	0.5961	0.0353
0.95	126	1.2801	0.6473	0.1487
0.95	138	-0.2585	0.5079	0.042
0.95	150	-0.5305	0.5261	0.0674
0.95	174	0.3255	0.6085	0.0477
0.95	186	0.3703	0.608	0.0517
0.95	198	-0.4378	0.5364	0.0581
0.95	258	-1.1834	0.3927	0.1379