CLAS Physics Database

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Measurement E151M38

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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 :	0.1715 GeV²
W :	1235 GeV
ε :	0.7716
E_beam :	1.0539 GeV
ε_L:	0.6993

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	-0.3073	0.6171	0.0461
0.35	282	0.3222	0.5346	0.0474
0.45	270	0.1355	0.4909	0.0337
0.45	282	0.9472	0.3982	0.1119
0.45	294	-0.1588	0.5318	0.035
0.55	258	-0.8445	0.3959	0.1007
0.55	270	0.9371	0.4848	0.1108
0.55	282	0.9654	0.4293	0.1139
0.55	294	1.1832	0.4737	0.1379
0.65	246	-0.7205	0.4629	0.0873
0.65	258	1.9433	1.9433	0.2231
0.65	270	-0.2191	0.3976	0.039
0.65	282	-0.3016	0.4498	0.0456
0.65	294	-0.1355	0.4802	0.0337
0.75	258	0.144	0.4514	0.0342
0.75	270	0.6195	0.4575	0.0766
0.75	282	0.0641	0.4539	0.0309
0.75	294	-0.3969	0.4337	0.0542
0.85	114	-0.0483	0.5996	0.0305
0.85	126	0.3111	0.4819	0.0464
0.85	138	-0.3524	0.4482	0.0501
0.85	150	0.0096	0.5327	0.03
0.85	162	0.3088	0.4643	0.0462
0.85	174	-0.0201	0.477	0.0301
0.85	186	0.1446	0.5314	0.0342
0.85	198	-0.1821	0.5334	0.0365
0.85	210	-0.391	0.4875	0.0537
0.85	234	-0.1012	0.5084	0.0321
0.85	270	0.4164	0.4582	0.0561
0.85	282	0.3456	0.4681	0.0495
0.95	114	-0.2047	0.4284	0.038
0.95	126	-0.1556	0.4236	0.0348
0.95	138	-0.3673	0.3665	0.0514
0.95	150	-0.2055	0.3619	0.038
0.95	162	0.2	0.3987	0.0377
0.95	174	0.6842	0.438	0.0834
0.95	186	0.1423	0.4358	0.0341
0.95	198	-0.1123	0.3443	0.0326
0.95	210	-0.5162	0.3444	0.0659