CLAS Physics Database

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Measurement E151M44

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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 :	0.0121 GeV²
W :	1265 GeV
ε :	0.8946
E_beam :	1.0539 GeV
ε_L:	0.0709

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	42	-0.4759	0.5548	0.0619
0.25	54	1.264	0.6258	0.1469
0.35	54	1.6938	0.53	0.195
0.35	66	-0.538	0.6173	0.0682
0.45	42	-0.5415	0.5648	0.0685
0.45	54	-0.2485	0.5983	0.0412
0.45	258	0.2507	0.6495	0.0414
0.45	270	0.0446	0.6152	0.0304
0.55	30	2.2612	2.2612	0.259
0.55	42	-0.668	0.4988	0.0817
0.55	54	0.5457	0.4817	0.069
0.55	234	-0.0002	0.4521	0.03
0.55	246	-0.5603	0.3908	0.0705
0.55	258	-0.0182	0.3337	0.0301
0.55	270	0.663	0.4133	0.0812
0.65	150	-0.5047	0.5165	0.0648
0.65	162	-0.9106	0.4444	0.1079
0.65	174	-0.2116	0.4866	0.0385
0.65	198	-0.021	0.6095	0.0301
0.65	222	0.2962	0.4475	0.0451
0.65	234	0.2106	0.3909	0.0384
0.65	246	0.2172	0.2901	0.0389
0.65	258	-0.4459	0.2859	0.0589
0.65	270	0.4001	0.3565	0.0545
0.75	138	-0.4861	0.5112	0.0629
0.75	150	-0.4587	0.473	0.0602
0.75	162	0.0481	0.4463	0.0305
0.75	174	0.7973	0.4893	0.0955
0.75	186	0.2539	0.4563	0.0416
0.75	198	-0.0435	0.4825	0.0304
0.75	210	0.9077	0.5861	0.1075
0.75	222	-0.4022	0.4242	0.0547
0.75	234	0.3422	0.3704	0.0491
0.75	246	-0.4367	0.2635	0.058
0.75	258	0.0574	0.314	0.0307
0.75	270	0.4835	0.4078	0.0627
0.85	162	-0.2283	0.5322	0.0397
0.85	174	0.2438	0.6038	0.0409
0.85	186	-0.3841	0.5042	0.053
0.85	210	0.6643	0.5856	0.0813
0.85	222	-0.459	0.406	0.0602
0.85	234	0.3005	0.4104	0.0455
0.85	246	0.414	0.387	0.0558
0.85	258	-0.2857	0.3761	0.0442
0.85	270	0.1478	0.5957	0.0344