CLAS Physics Database

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Measurement E151M23

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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 :	1235 GeV
ε :	0.9165
E_beam :	1.0539 GeV
ε_L:	0.0901

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
0.45	42	-0.5139	0.4737	0.0657
0.45	54	-0.2344	0.4566	0.0401
0.45	66	-0.2605	0.5607	0.0422
0.45	270	-0.1538	0.441	0.0347
0.55	246	0.1422	0.3889	0.0341
0.55	258	0.369	0.34	0.0516
0.55	270	-0.0493	0.3227	0.0305
0.55	282	0.2329	0.4523	0.04
0.65	162	-0.0808	0.5096	0.0314
0.65	174	0.2099	0.513	0.0383
0.65	186	1.0145	0.5448	0.1193
0.65	198	0.8087	0.5856	0.0968
0.65	234	-0.5695	0.3232	0.0714
0.65	246	0.4387	0.3306	0.0582
0.65	258	0.1577	0.2868	0.035
0.65	270	0.1925	0.3572	0.0371
0.65	282	-0.0391	0.4158	0.0303
0.75	150	0.0331	0.4544	0.0302
0.75	162	0.0205	0.4141	0.0301
0.75	174	0.4238	0.3952	0.0568
0.75	186	0.022	0.4168	0.0301
0.75	198	0.0631	0.4099	0.0308
0.75	210	0.2099	0.5604	0.0383
0.75	222	0.7206	0.4593	0.0873
0.75	234	0.1863	0.3892	0.0367
0.75	246	-0.2124	0.2984	0.0385
0.75	258	0.1221	0.2873	0.0331
0.75	270	-0.564	0.3403	0.0708
0.85	174	-0.0432	0.5212	0.0304
0.85	186	-0.6261	0.4251	0.0773
0.85	234	-0.9689	0.3487	0.1142
0.85	246	-0.198	0.4978	0.0375
0.85	258	0.7599	0.5039	0.0915