CLAS Physics Database

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Measurement E151M159

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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 :	0.0707 GeV²
W :	1415 GeV
ε :	0.6408
E_beam :	1.0539 GeV
ε_L:	0.1123

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	0.2845	0.8823	0.0441
0.35	30	0.7584	0.8501	0.0913
0.35	42	1.3332	0.8337	0.1546
0.35	54	0.196	0.8221	0.0374
0.45	42	-0.6071	0.678	0.0753
0.45	246	-0.4841	0.7992	0.0627
0.55	234	0.3753	0.6726	0.0522
0.55	246	0.476	0.6613	0.0619
0.55	258	-0.4571	0.6715	0.06
0.65	150	0.0496	0.7661	0.0305
0.65	210	0.471	0.832	0.0614
0.65	222	0.3541	0.7078	0.0502
0.65	234	0.4758	0.5355	0.0619
0.65	246	0.8166	0.5717	0.0976
0.65	258	-0.6287	0.538	0.0776
0.65	270	-0.654	0.6961	0.0802
0.75	126	-0.119	0.7983	0.0329
0.75	138	-0.1571	0.6828	0.0349
0.75	150	-0.1018	0.7639	0.0322
0.75	162	-0.9897	0.6715	0.1165
0.75	174	-0.0109	0.8208	0.03
0.75	222	1.4336	0.8424	0.1658
0.75	234	1.2639	0.6433	0.1469
0.75	246	-0.2876	0.5202	0.0444
0.75	258	-0.0285	0.466	0.0302
0.75	270	-0.7381	0.5831	0.0892
0.85	150	0.2151	0.8349	0.0387
0.85	234	1.1854	0.6242	0.1382
0.85	246	0.3408	0.5042	0.049
0.85	258	0.6512	0.4807	0.0799
0.85	270	0.2513	0.5772	0.0414
0.95	150	-0.8325	0.5699	0.0994
0.95	246	0.1488	0.5946	0.0344
0.95	258	1.1084	0.5908	0.1296
0.95	270	0.7394	0.6075	0.0893