CLAS Physics Database

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Measurement E151M36

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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 :	0.1205 GeV²
W :	1235 GeV
ε :	0.8194
E_beam :	1.0539 GeV
ε_L:	0.5937

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
0.05	42	-1.0104	0.4785	0.1188
0.45	270	-0.3046	0.503	0.0458
0.45	282	-0.2286	0.5147	0.0397
0.45	294	0.3695	0.5472	0.0516
0.55	258	0.3943	0.5941	0.054
0.55	270	-0.9696	0.3465	0.1143
0.55	282	0.7923	0.4273	0.095
0.55	294	0.3685	0.5897	0.0516
0.65	258	0.4981	0.4942	0.0641
0.65	270	0.7506	0.4397	0.0905
0.65	282	0.1304	0.4405	0.0335
0.65	294	-0.6282	0.4982	0.0775
0.75	246	0.0693	0.5062	0.031
0.75	258	-0.2842	0.4255	0.0441
0.75	270	-0.4581	0.3833	0.0601
0.75	282	0.0394	0.4338	0.0303
0.75	294	-0.1304	0.5075	0.0335
0.85	114	-0.8995	0.4818	0.1066
0.85	138	0.1962	0.4938	0.0374
0.85	150	-0.2049	0.4348	0.038
0.85	162	0.6447	0.517	0.0792
0.85	174	0.1925	0.5596	0.0371
0.85	258	0.274	0.5183	0.0433
0.85	282	-0.499	0.439	0.0642
0.95	126	0.1093	0.376	0.0325
0.95	138	0.0685	0.4768	0.031
0.95	150	0.3769	0.4797	0.0523
0.95	162	-0.4584	0.3608	0.0602
0.95	186	0.6243	0.4711	0.0771