CLAS Physics Database

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Measurement E151M194

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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 :	0.0496 GeV²
W :	1475 GeV
ε :	0.5492
E_beam :	1.0539 GeV
ε_L:	0.053

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
0.25	42	0.7659	0.7575	0.0922
0.25	54	0.5533	0.6694	0.0697
0.35	54	-0.5862	0.5672	0.0731
0.45	42	-0.7959	0.6275	0.0954
0.45	54	0.0965	0.7305	0.0319
0.45	234	0.5762	0.7682	0.0721
0.45	258	0.1076	0.78	0.0324
0.55	174	-0.2676	0.6951	0.0427
0.55	222	0.9571	0.7641	0.1129
0.55	234	0.1897	0.6373	0.037
0.55	246	1.0042	0.5871	0.1181
0.55	258	1.1527	0.7279	0.1345
0.55	270	0.909	0.888	0.1077
0.65	150	-0.8672	0.7117	0.1031
0.65	234	0.6033	0.5347	0.0749
0.65	246	0.6589	0.5869	0.0807
0.65	258	0.7382	0.5759	0.0892
0.75	150	-0.0668	0.79	0.0309
0.75	234	0.683	0.5787	0.0833
0.75	246	0.1036	0.4984	0.0322
0.75	258	0.5904	0.4981	0.0736
0.75	270	-1.0231	0.5993	0.1202
0.85	234	1.2412	0.5313	0.1444
0.85	246	-0.9673	0.368	0.1141
0.85	258	-0.418	0.5135	0.0562
0.85	270	-0.064	0.6022	0.0309