CLAS Physics Database

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Measurement E151M25

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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 :	0.0171 GeV²
W :	1235 GeV
ε :	0.9121
E_beam :	1.0539 GeV
ε_L:	0.1257

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	-0.9572	0.3762	0.113
0.25	54	0.0599	0.5144	0.0308
0.35	30	0.142	0.5349	0.0341
0.35	42	-0.0086	0.3611	0.03
0.35	54	0.0784	0.4199	0.0313
0.35	66	0.0724	0.6066	0.0311
0.45	42	0.2631	0.4062	0.0424
0.45	54	-0.3513	0.3535	0.05
0.45	258	-0.4538	0.4098	0.0597
0.45	270	0.135	0.4166	0.0337
0.45	282	-0.0463	0.4641	0.0305
0.55	54	-1.0709	0.4178	0.1255
0.55	234	-0.4166	0.505	0.0561
0.55	246	0.207	0.3517	0.0381
0.55	258	0.4594	0.2925	0.0603
0.55	270	-0.1876	0.3004	0.0368
0.55	282	0.0257	0.3552	0.0301
0.65	150	1.3056	0.5588	0.1515
0.65	162	0.0591	0.497	0.0307
0.65	174	-0.1488	0.5714	0.0344
0.65	198	-0.4816	0.4825	0.0625
0.65	222	0.5307	0.5291	0.0674
0.65	234	0.0751	0.3568	0.0312
0.65	246	0.2264	0.2984	0.0395
0.65	258	-0.0969	0.2111	0.032
0.65	270	-0.1809	0.2204	0.0364
0.65	282	0.3798	0.366	0.0526
0.75	138	-0.0314	0.4999	0.0302
0.75	150	0.1392	0.4088	0.0339
0.75	162	0.1667	0.3837	0.0355
0.75	174	0.4297	0.3431	0.0574
0.75	186	-0.3598	0.3237	0.0507
0.75	198	-0.0586	0.403	0.0307
0.75	210	-0.5658	0.4463	0.071
0.75	222	0.0233	0.4205	0.0301
0.75	234	-0.0157	0.3099	0.0301
0.75	246	-0.0756	0.2551	0.0312
0.75	258	0.1287	0.2661	0.0334
0.75	270	0.017	0.2794	0.0301
0.75	282	0.4369	0.5036	0.0581
0.85	138	0.8049	0.5655	0.0964
0.85	150	-0.0476	0.4454	0.0305
0.85	162	0.0132	0.4166	0.03
0.85	174	-0.3511	0.2932	0.05
0.85	186	-0.0909	0.3814	0.0317
0.85	198	0.112	0.3658	0.0326
0.85	210	0.2155	0.5119	0.0387
0.85	222	-0.5403	0.4479	0.0684
0.85	234	0.2001	0.3694	0.0377
0.85	246	0.3461	0.3471	0.0495
0.85	258	-0.3745	0.3461	0.0521
0.85	270	0.4563	0.5371	0.06