CLAS Physics Database

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Measurement E209M20

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Experiment: CLAS12 RG-K K+Y recoil polarization, 2025

Spokespersons: Daniel S. Carman

Publication:

D. S. Carman et al. (CLAS Collaboration) Recoil Polarization in K+Y Electroproduction in the Nucleon Resonance Region with CLAS12 // https://arxiv.org/abs/2505.12030

Quantity measured: P⁰_y′,
y projection of recoil polarization P⁰; in (x',y',z') system
Beam: e, polarization: none
Target: p (Z=1, A=1), polarization: none
Final state: K⁺ Σ⁰, polarization: polarized

Q² :	0.4 — 4.5 GeV²
W :	1.625 — 2.4 GeV
E_beam :	7.546 GeV

Observable quantity measured (Y axis): P⁰_y′,
Plot measurement data

Parameter (X axis): Q², GeV²

Click here to get data in text file, delimited with tabs.

Measured data:

Q², GeV²	P⁰_y′	Data errors	Systematic errors
0.45	0.2119	0.0795	0.0898
0.55	0.1073	0.0718	0.0501
0.65	0.0079	0.0866	0.0584
0.75	-0.2625	0.0982	0.0939
0.85	-0.2156	0.1117	0.1742
0.95	-0.4167	0.1352	0.1026
1.05	-0.3962	0.1531	0.1444
1.15	-0.0838	0.1727	0.1808
1.25	-0.4696	0.1881	0.0757
1.35	-0.16	0.2099	0.1315
1.45	-0.1879	0.2494	0.097
1.6	-0.0124	0.1997	0.1171
1.8	-0.2853	0.2461	0.1882
2	0.4643	0.3168	0.1297
2.2	-0.2809	0.378	0.0284
2.4	1.0781	0.4271	0.0261
2.65	0.2756	0.4163	0.0814
2.95	0.7643	0.5367	0.0245
3.3	0.9539	0.5739	0.2701
4	0.5014	0.6009	0.2472