CLAS Physics Database

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Measurement E151M71

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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 :	0.0348 GeV²
W :	1295 GeV
ε :	0.8461
E_beam :	1.0539 GeV
ε_L:	0.15

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	-0.1087	0.6072	0.0324
0.35	30	0.1922	0.6361	0.0371
0.35	42	-0.0818	0.6269	0.0314
0.45	30	0.6251	0.7009	0.0772
0.45	42	0.5271	0.5407	0.0671
0.45	54	0.8113	0.8019	0.0971
0.45	270	-0.513	0.6189	0.0656
0.55	246	0.4641	0.4569	0.0607
0.55	258	0.5391	0.457	0.0683
0.55	270	-0.304	0.3998	0.0458
0.55	282	0.8906	0.7036	0.1057
0.65	150	1.5211	0.6545	0.1756
0.65	234	-0.3552	0.4353	0.0503
0.65	246	-0.3476	0.3714	0.0496
0.65	258	-0.1191	0.3714	0.0329
0.65	270	-0.063	0.3546	0.0308
0.65	282	-0.0673	0.5846	0.031
0.75	126	-0.2094	0.6904	0.0383
0.75	138	-0.486	0.5362	0.0629
0.75	150	-0.6171	0.521	0.0763
0.75	162	0.0591	0.5002	0.0307
0.75	174	-0.0842	0.5518	0.0315
0.75	186	0.7813	0.6141	0.0938
0.75	198	1.0529	0.7057	0.1235
0.75	222	-0.8954	0.4484	0.1062
0.75	234	0.2501	0.4056	0.0413
0.75	246	-0.3845	0.3132	0.053
0.75	258	0.8832	0.3565	0.1049
0.75	270	0.7938	0.3689	0.0952
0.75	282	-0.2258	0.4766	0.0395
0.85	126	-0.1217	0.6324	0.033
0.85	138	0.4782	0.476	0.0621
0.85	150	0.0704	0.415	0.0311
0.85	162	0.4668	0.4703	0.061
0.85	174	0.3045	0.5246	0.0458
0.85	186	0.3654	0.5149	0.0513
0.85	198	-0.0549	0.5582	0.0306
0.85	210	0.4223	0.6512	0.0566
0.85	222	0.4478	0.6195	0.0591
0.85	234	0.6427	0.4137	0.079
0.85	246	-0.3105	0.3116	0.0463
0.85	258	-0.0787	0.2987	0.0313
0.85	270	-0.145	0.3392	0.0342
0.85	282	0.2116	0.5147	0.0385
0.95	138	-0.1244	0.5564	0.0332
0.95	150	-0.2876	0.5506	0.0444
0.95	162	-0.2128	0.5517	0.0385
0.95	258	0.2746	0.5487	0.0433