CLAS Physics Database

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Measurement E151M7

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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 :	0.0245 GeV²
W :	1205 GeV
ε :	0.9247
E_beam :	1.0539 GeV
ε_L:	0.2241

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	54	0.5729	0.516	0.0717
0.35	54	-0.3771	0.4824	0.0523
0.45	270	0.2809	0.5002	0.0438
0.45	282	-0.3988	0.4394	0.0544
0.55	258	0.1304	0.4162	0.0335
0.55	270	-0.4045	0.3234	0.0549
0.55	282	-1.2211	0.2619	0.1421
0.65	246	0.5278	0.4385	0.0671
0.65	258	-0.0685	0.3248	0.031
0.65	270	-0.3166	0.2698	0.0469
0.75	162	0.668	0.4103	0.0817
0.75	174	-0.3737	0.3975	0.052
0.75	186	-0.4836	0.4016	0.0627
0.75	198	0.007	0.3878	0.03
0.75	210	0.2556	0.48	0.0418
0.75	234	-0.1382	0.4643	0.0339
0.75	246	-0.1826	0.4032	0.0365
0.75	258	-0.0823	0.3337	0.0314
0.75	270	0.8008	0.4923	0.0959
0.85	150	-0.7347	0.3348	0.0888
0.85	162	0.0609	0.391	0.0308
0.85	174	-0.264	0.338	0.0424
0.85	186	0.4138	0.3434	0.0558
0.85	198	-0.3935	0.3495	0.0539
0.85	210	-0.1565	0.4309	0.0349
0.85	222	0.4383	0.4701	0.0582