CLAS Physics Database

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Measurement E151M15

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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 :	0.101 GeV²
W :	1205 GeV
ε :	0.8605
E_beam :	1.0539 GeV
ε_L:	0.6763

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	282	-0.7256	0.3827	0.0878
0.35	294	-0.0163	0.4378	0.0301
0.45	270	0.1855	0.4666	0.0367
0.45	282	0.5171	0.3947	0.066
0.45	294	0.6819	0.5094	0.0832
0.55	270	-0.1156	0.3671	0.0328
0.55	282	0.4156	0.3605	0.056
0.55	294	0.0138	0.4284	0.03
0.65	258	-0.0932	0.4163	0.0318
0.65	270	0.3224	0.3634	0.0474
0.65	282	0.0899	0.3031	0.0317
0.75	270	-0.2094	0.4031	0.0383
0.75	282	0.501	0.4012	0.0644
0.75	294	-0.0774	0.438	0.0313
0.85	138	0.1439	0.5385	0.0342
0.85	150	0.0932	0.4639	0.0318
0.85	162	0.9368	0.432	0.1107
0.85	186	0.4988	0.524	0.0642
0.85	198	0.2105	0.4833	0.0384
0.85	210	-0.1011	0.4342	0.0321
0.85	222	0.339	0.4254	0.0489
0.95	126	0.8089	0.3856	0.0968
0.95	138	-0.3252	0.2878	0.0476
0.95	150	0.1544	0.3131	0.0348
0.95	162	0.1437	0.3461	0.0342
0.95	174	-0.2749	0.3119	0.0433
0.95	186	0.0563	0.3175	0.0307
0.95	198	0.1856	0.3919	0.0367
0.95	210	0.67	0.3795	0.0819
0.95	222	0.3161	0.378	0.0468
0.95	234	-0.8025	0.2839	0.0961