CLAS Physics Database

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Measurement E151M250

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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 :	0.2445 GeV²
W :	1265 GeV
ε :	0.8039
E_beam :	1.3383 GeV
ε_L:	0.7443

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
0.55	270	-0.0459	0.4391	0.0341
0.65	258	-0.0382	0.5533	0.0301
0.65	282	0.0902	0.5271	0.0305
0.75	114	-0.3182	0.5229	0.0359
0.75	258	0.538	0.523	0.0448
0.75	270	0.8917	0.4944	0.0628
0.75	294	-0.4451	0.5333	0.0407
0.85	90	0.2285	0.5495	0.0332
0.85	114	-0.067	0.514	0.0303
0.85	126	0.139	0.5008	0.0312
0.85	138	-0.3507	0.5451	0.037
0.85	282	-0.2321	0.5213	0.0333
0.95	114	-0.4963	0.4433	0.0429
0.95	138	-0.1105	0.4658	0.0308
0.95	150	-0.934	0.4198	0.0652
0.55	282	-0.9131	0.4688	0.0626
0.65	258	-0.2461	0.6773	0.0335
0.65	270	-0.8283	0.5309	0.0582
0.65	282	0.1772	0.7924	0.0318
0.65	294	-0.2472	0.6656	0.0335
0.75	246	-0.1137	0.6844	0.0308
0.75	258	-0.049	0.7972	0.0301
0.75	282	-0.1063	0.6685	0.0307
0.85	90	0.6544	1.0384	0.0495
0.85	102	-0.2003	0.7411	0.0323
0.85	126	-0.8191	0.5933	0.0577
0.85	138	-0.7265	0.605	0.053
0.85	270	0.4731	0.9208	0.0414
0.85	282	1.5387	0.9565	0.0974
0.85	294	1.6459	0.895	0.1036