CLAS Physics Database

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Measurement E151M106

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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 :	0.0084 GeV²
W :	1355 GeV
ε :	0.8064
E_beam :	1.0539 GeV
ε_L:	0.0258

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	42	-0.1439	0.7847	0.0342
0.35	54	0.1433	0.8604	0.0341
0.45	42	-1.5596	0.5805	0.18
0.45	54	0.9364	0.7193	0.1107
0.55	30	0.3085	0.7917	0.0462
0.55	42	-0.1885	0.6122	0.0369
0.55	54	0.6232	0.7283	0.077
0.55	222	1.479	0.828	0.1709
0.55	234	0.6827	0.6538	0.0833
0.55	246	-0.0708	0.6792	0.0311
0.55	258	0.1417	0.7666	0.0341
0.65	30	0.9203	0.8912	0.1089
0.65	42	-0.1998	0.639	0.0376
0.65	54	0.7033	0.6822	0.0855
0.65	150	-1.0875	0.6827	0.1273
0.65	162	1.1237	0.856	0.1313
0.65	174	0.3762	0.8042	0.0523
0.65	222	-0.1448	0.5873	0.0342
0.65	234	0.2065	0.5154	0.0381
0.65	246	-0.437	0.5691	0.0581
0.65	258	0.7987	0.7545	0.0957
0.75	138	-0.5385	0.7438	0.0682
0.75	150	0.7446	0.8533	0.0899
0.75	210	-0.156	0.7094	0.0349
0.75	222	0.8248	0.5884	0.0985
0.75	234	-0.4872	0.4735	0.063
0.75	246	-0.3374	0.4283	0.0487
0.75	258	-0.4431	0.639	0.0587
0.85	222	0.3322	0.5443	0.0483
0.85	234	0.294	0.5622	0.0449
0.85	246	-0.0377	0.5142	0.0303
0.85	258	0.1837	0.7108	0.0366