CLAS Physics Database

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Measurement E151M37

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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 :	0.1435 GeV²
W :	1235 GeV
ε :	0.798
E_beam :	1.0539 GeV
ε_L:	0.6489

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	294	0.1999	0.5939	0.0376
0.35	282	0.0448	0.5063	0.0304
0.35	294	0.1204	0.5685	0.033
0.45	270	0.1105	0.5381	0.0325
0.45	282	-0.0622	0.4205	0.0308
0.45	294	0.3603	0.5691	0.0508
0.55	270	0.364	0.4508	0.0511
0.55	282	0.423	0.4113	0.0567
0.55	294	-0.6391	0.4861	0.0787
0.65	258	-0.1973	0.408	0.0375
0.65	270	0.4974	0.4408	0.0641
0.65	282	0.939	0.4751	0.111
0.65	294	-0.3177	0.4305	0.047
0.75	258	-0.8875	0.4209	0.1053
0.75	270	0.0795	0.4957	0.0313
0.75	282	0.3873	0.4541	0.0533
0.75	294	0.2342	0.4863	0.0401
0.85	114	-0.5049	0.4572	0.0648
0.85	138	1.1544	0.5768	0.1347
0.85	150	0.4977	0.5132	0.0641
0.85	162	0.6042	0.5636	0.075
0.85	174	0.5999	0.602	0.0746
0.85	198	0.028	0.5005	0.0302
0.85	210	-0.4493	0.478	0.0593
0.85	270	0.5035	0.499	0.0647
0.85	282	-0.3214	0.4831	0.0473
0.95	114	-0.2361	0.397	0.0403
0.95	126	0.6471	0.4509	0.0795
0.95	138	-0.5463	0.3893	0.069
0.95	150	0.8583	0.411	0.1022
0.95	162	0.0655	0.4446	0.0309
0.95	174	-0.4241	0.3638	0.0568
0.95	186	-0.29	0.3657	0.0446
0.95	198	0.544	0.4706	0.0688
0.95	210	-0.4641	0.3306	0.0607