Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2006-11-21
Physics
Nuclear Physics
Nuclear Experiment
6 pages, 4 figures, for HYP2006 Conference Proceedings in European Physics Journal A; revised with expanded discussion section
Scientific paper
Recent measurements using the CLAS detector at Jefferson Lab of the reactions $\vec\gamma + p \to K^+ + \vec\Lambda$ and $\vec\gamma + p \to K^+ + \vec\Sigma^0$ have been used to extract the spin transfer coefficients $C_x$ and $C_z$ for the first time. These observables quantify the degree of the photon circular polarization that is transferred to the recoiling hyperons in the scattering plane. The unexpected result is that $\Lambda$ hyperons are produced ``100% polarized'' as seen when combining $C_x$ and $C_z$ with the induced transverse polarization, $P$. Furthermore, $C_x$ and $C_z$ seem to be linearly related. This paper discusses the experimental results and offers a hypothesis which can explain these observations. We show how the produced strange quark can be subject to a pure spin-orbit type of interaction which preserves its state of polarization throughout the hadronization process.
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