CLAS Physics Database

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Measurement E151M9

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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 :	0.0348 GeV²
W :	1205 GeV
ε :	0.9162
E_beam :	1.0539 GeV
ε_L:	0.3053

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	282	-0.0204	0.4466	0.0301
0.55	258	-0.1125	0.4003	0.0326
0.55	270	0.2269	0.3761	0.0396
0.55	282	-0.7785	0.3444	0.0935
0.65	258	-0.439	0.3447	0.0583
0.65	270	-0.0034	0.2842	0.03
0.75	246	-1.036	0.3499	0.1216
0.75	258	0.1602	0.4087	0.0351
0.75	270	-0.0723	0.3785	0.0311
0.85	138	1.0086	0.5441	0.1186
0.85	150	0.7962	0.4231	0.0954
0.85	162	-0.0223	0.4465	0.0301
0.85	174	-0.373	0.3061	0.052
0.85	186	0.2089	0.3485	0.0383
0.85	198	-0.1159	0.3131	0.0328
0.85	210	-0.0053	0.437	0.03
0.85	222	-0.2973	0.4061	0.0452
0.95	174	0.1896	0.4183	0.0369