CLAS Physics Database

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Measurement E151M99

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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 :	0.101 GeV²
W :	1325 GeV
ε :	0.7431
E_beam :	1.0539 GeV
ε_L:	0.2772

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
0.35	42	1.9576	0.9706	0.2247
0.55	258	0.1805	0.7288	0.0364
0.55	270	0.3252	0.6881	0.0476
0.65	234	-0.8046	0.638	0.0963
0.65	246	-0.3263	0.5772	0.0477
0.65	258	0.5718	0.5721	0.0716
0.65	270	0.4539	0.6111	0.0597
0.65	282	0.2941	0.7545	0.0449
0.75	126	-0.0769	0.8333	0.0312
0.75	138	0.5931	0.6489	0.0739
0.75	150	1.118	0.819	0.1307
0.75	234	-0.5029	0.6431	0.0646
0.75	246	0.2003	0.6403	0.0377
0.75	270	-1.3115	0.4837	0.1522
0.75	282	-0.0937	0.5655	0.0318
0.85	114	-0.1738	0.6938	0.0359
0.85	126	-0.052	0.6389	0.0306
0.85	138	-0.0445	0.586	0.0304
0.85	150	0.9951	0.6936	0.1171
0.85	162	0.0085	0.6143	0.03
0.85	174	-0.8163	0.6692	0.0976
0.85	186	-0.4356	0.6862	0.0579
0.85	246	-0.1725	0.5775	0.0359
0.85	258	-0.1957	0.4408	0.0374
0.85	270	0.3115	0.5747	0.0464
0.85	282	-0.3449	0.5178	0.0494
0.95	102	-0.1721	0.5397	0.0358
0.95	126	0.272	0.6425	0.0431
0.95	138	1.4938	0.649	0.1726
0.95	258	0.1258	0.5891	0.0332
0.95	270	0.1361	0.552	0.0338