CLAS Physics Database

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Measurement E151M137

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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 :	0.0496 GeV²
W :	1385 GeV
ε :	0.7168
E_beam :	1.0539 GeV
ε_L:	0.1059

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	42	0.1261	0.8189	0.0333
0.25	54	-0.1051	0.9059	0.0323
0.35	30	1.1257	0.9245	0.1315
0.35	42	-0.5913	0.5436	0.0737
0.35	54	0.4356	0.7651	0.0579
0.45	30	-1.2517	0.6216	0.1455
0.45	42	-0.6027	0.6443	0.0748
0.45	54	-1.3106	0.745	0.1521
0.45	246	0.4976	0.8809	0.0641
0.55	42	1.8888	0.8614	0.217
0.55	234	-0.1721	0.5598	0.0358
0.55	246	0.83	0.5893	0.0991
0.55	258	0.7224	0.5496	0.0875
0.65	138	-0.7783	0.6661	0.0935
0.65	150	1.2122	0.7826	0.1411
0.65	162	0.9675	0.8124	0.1141
0.65	174	-0.2836	0.808	0.0441
0.65	222	0.6587	0.637	0.0807
0.65	234	0.0439	0.5644	0.0304
0.65	246	-0.4278	0.4826	0.0572
0.65	258	-1.2646	0.3964	0.147
0.65	270	-0.5368	0.5639	0.068
0.75	126	0.4158	0.9325	0.056
0.75	138	-0.2086	0.6486	0.0383
0.75	150	0.3296	0.633	0.048
0.75	162	2.0046	0.715	0.23
0.75	210	-0.4828	0.7989	0.0626
0.75	222	0.5356	0.6316	0.0679
0.75	234	0.8832	0.6096	0.1049
0.75	246	0.7727	0.4784	0.0929
0.75	258	0.2456	0.4559	0.041
0.75	270	-0.1483	0.5711	0.0344
0.85	138	-0.3278	0.7049	0.0479
0.85	150	-0.1243	0.7684	0.0332
0.85	162	0.197	0.7434	0.0374
0.85	174	0.3458	0.7779	0.0495
0.85	234	0.398	0.528	0.0543
0.85	246	1.0633	0.4686	0.1246
0.85	258	-0.2627	0.4503	0.0424
0.85	270	0.2471	0.4159	0.0411
0.95	126	0.6535	0.7523	0.0802
0.95	234	1.7308	0.5745	0.1992
0.95	246	-0.1095	0.5578	0.0325
0.95	258	-0.4664	0.4349	0.061
0.95	270	-0.5156	0.5847	0.0659