Instanton-induced polarization in exclusive hyperon photoproduction

Instanton-Induced Polarization in Exclusive Hyperon Photoproduction

It is shown that instantons can provide an explanation of the strong polarization transfer observed in exclusive hyperon photoproduction at JLab. Pacs: 13.60.-r, 13.60.Rj, 13.88.+e, 12.38.-t,

Exclusive J/ψ photoproduction and gluon polarization

In exclusive J/ψ production by polarized photons incident on polarized protons , a finite polarization asymmetry arises because of c¯ c Fermi-motion and binding-energy effects. The asymmetry depends on the polarized nonfor-ward gluon distribution of the proton and thus gives information on gluon polarization in the proton. The analyzing power, however, is rather small. Gluon polarization in the...

Baryon resonances and polarization transfer in hyperon photoproduction

The new CLAS data on hyperon photoproduction [1] show a remarkably large spin transfer probability. In the reactions γp → ΛK and γp → ΣK using a circularly polarized photon beam, the polarizations of the Λ and Σ hyperons were monitored by measurements of their decay angular distributions. For photons with helicity hγ = 1, the magnitude of the Λ polarization vector, |PΛ|, was found to be close t...

Hyperon polarization in Kaon Photoproduction from the deuteron

Since hyperon-nucleon scattering experiments are difficult to perform, hyperon production processes such as γ + d → K + Y + N and e + d → e +K + Y + N appear as natural candidates that allow exploring the Y N interaction. One can obtain the information of the Y N interaction by analyzing the correlated Y N final states. An inclusive d(e, eK)Y N experiment has already been performed in Hall C at...

Hypernuclear Physics Polarization Effects in Exclusive Hyperon Production Reactions