CLAS Physics Database

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Measurement E151M30

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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 :	0.0415 GeV²
W :	1235 GeV
ε :	0.8908
E_beam :	1.0539 GeV
ε_L:	0.2767

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
0.15	42	0.4434	0.5518	0.0587
0.15	54	0.1427	0.5779	0.0341
0.25	42	0.186	0.3841	0.0367
0.25	54	-0.848	0.381	0.101
0.35	42	-0.1911	0.3947	0.037
0.35	54	0.2019	0.4787	0.0378
0.35	282	-0.9431	0.4523	0.1114
0.45	270	0.1382	0.4482	0.0339
0.45	282	0.1646	0.3861	0.0354
0.55	246	-0.6091	0.4846	0.0755
0.55	258	-0.299	0.3469	0.0454
0.55	270	0.0002	0.2782	0.03
0.55	282	0.0115	0.3666	0.03
0.65	246	-0.7645	0.3234	0.092
0.65	258	0.1358	0.2813	0.0337
0.65	270	0.2939	0.265	0.0449
0.65	282	0.4174	0.3484	0.0562
0.65	294	0.0755	0.5045	0.0312
0.75	150	-0.0355	0.4737	0.0303
0.75	162	0.4821	0.579	0.0625
0.75	174	0.5823	0.5025	0.0727
0.75	186	0.1984	0.5021	0.0375
0.75	198	0.0715	0.5708	0.0311
0.75	210	-0.8951	0.4526	0.1062
0.75	234	-0.2786	0.4292	0.0436
0.75	246	0.1782	0.3549	0.0362
0.75	258	0.1478	0.3032	0.0344
0.75	270	-0.0634	0.2899	0.0309
0.75	282	0.4461	0.372	0.059
0.85	126	0.0072	0.4965	0.03
0.85	138	-0.0945	0.3906	0.0319
0.85	150	-0.5791	0.3051	0.0724
0.85	162	-0.4788	0.2586	0.0622
0.85	174	0.192	0.3099	0.0371
0.85	186	0.1643	0.3467	0.0353
0.85	198	-0.2802	0.3486	0.0438
0.85	210	-1.0023	0.3492	0.1179
0.85	222	0.0569	0.4545	0.0307
0.85	234	0.4326	0.471	0.0576
0.85	246	0.3293	0.3861	0.048
0.85	258	-0.0967	0.3223	0.032
0.85	270	0.1815	0.3378	0.0364
0.95	150	-0.7092	0.3069	0.0861
0.95	162	-0.3615	0.3871	0.0509
0.95	174	-0.166	0.3507	0.0354
0.95	186	-0.6567	0.3065	0.0805
0.95	198	-0.1143	0.4128	0.0327