CLAS Physics Database

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Measurement E151M14

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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 :	0.0844 GeV²
W :	1205 GeV
ε :	0.8747
E_beam :	1.0539 GeV
ε_L:	0.6043

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	-0.5757	0.4068	0.072
0.55	270	0.5687	0.3426	0.0713
0.55	282	-0.0576	0.3549	0.0307
0.55	294	-0.3783	0.4027	0.0525
0.65	258	0.2587	0.4612	0.042
0.65	270	-0.3124	0.3536	0.0465
0.65	282	0.1661	0.3247	0.0355
0.75	258	-0.6306	0.3624	0.0778
0.75	270	0.0338	0.3592	0.0302
0.75	282	0.0166	0.4161	0.0301
0.85	138	0.1521	0.4289	0.0346
0.85	150	0.0884	0.3844	0.0316
0.85	162	0.0549	0.4128	0.0306
0.85	174	-0.1164	0.3892	0.0328
0.85	186	-0.1196	0.3772	0.0329
0.85	198	0.0893	0.4193	0.0317
0.85	210	-0.4479	0.4178	0.0591
0.85	222	0.4248	0.4388	0.0569
0.85	234	-0.0371	0.4748	0.0303
0.95	126	-0.2376	0.3583	0.0404
0.95	138	0.0715	0.3391	0.0311
0.95	150	0.103	0.3592	0.0322
0.95	162	0.2243	0.3153	0.0394
0.95	174	-0.2337	0.3423	0.0401
0.95	186	-0.1054	0.2791	0.0323
0.95	198	-0.2452	0.3109	0.041
0.95	210	-0.4199	0.2652	0.0564
0.95	222	-0.2041	0.3061	0.0379