CLAS Physics Database

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Measurement E151M480

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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 :	0.9507
E_beam :	1.9889 GeV
ε_L:	0.7731

Select data slice:
cos(θ_π⁺) =

Observable quantity measured (Y axis): A_UL,
Plot measurement data

Parameter (X axis): φ(π⁺), degrees

Click here to get data in text file, delimited with tabs.

Measured data:

cos(θ_π⁺)	φ(π⁺), degrees	A_UL	Data errors	Systematic errors
0.35	66	0.738	0.5692	0.0542
0.45	66	-0.3516	0.5087	0.0369
0.45	78	-0.97	0.372	0.0665
0.45	282	-0.3587	0.4134	0.0372
0.55	78	-0.0911	0.5918	0.0305
0.55	270	0.0271	0.5544	0.03
0.55	282	-0.1776	0.3911	0.0319
0.65	258	0.3572	0.5424	0.0371
0.65	270	0.2856	0.4222	0.0347
0.65	282	0.0813	0.3963	0.0304
0.75	90	-0.5245	0.4983	0.0439
0.75	258	-0.1706	0.3671	0.0318
0.75	270	0.372	0.3611	0.0377
0.75	282	1.1032	0.4407	0.0738
0.85	90	-0.2884	0.3973	0.0348
0.85	102	-0.3386	0.3508	0.0365
0.85	114	-0.4724	0.353	0.0417
0.85	126	-0.3994	0.4081	0.0387
0.85	258	-0.9499	0.3633	0.0654
0.85	270	-0.4407	0.3821	0.0403
0.85	282	0.4735	0.5484	0.0417
0.95	78	-0.268	0.4384	0.0342
0.95	90	-0.4248	0.3447	0.0397
0.95	102	0.2282	0.4202	0.0331
0.95	114	-0.0465	0.4615	0.0301
0.95	126	0.2062	0.3942	0.0325
0.95	138	0.3657	0.4087	0.0374
0.95	150	0.0962	0.4451	0.0306
0.95	174	0.6492	0.4603	0.0498