The European Physical Journal A

, Volume 35, Issue 3, pp 299–305

Polarization in hyperon photo- and electro-production

Regular Article - Experimental Physics

DOI: 10.1140/epja/i2007-10558-3

Cite this article as:
Schumacher, R. Eur. Phys. J. A (2008) 35: 299. doi:10.1140/epja/i2007-10558-3


Multiple polarization observables must be measured to access the amplitude structure of pseudoscalar meson photoproduction off the proton. The hyperon-producing reactions are especially attractive to study, since the weak decays allow straightforward measurement of the induced and recoil polarization observables. In this paper we emphasize γ + pK+ + Λ , discussing recent measurements of Cx, Cz, and P for this reaction. An empirical constraint on the helicity amplitudes is obtained. A simplified model involving spin-flip and spin-non-flip amplitudes is presented. Finally, a semi-classical model of how the polarization may arise is presented.


25.20.Lj Photoproduction reactions13.40.-f Electromagnetic processes and properties13.60.Le Meson production13.60.-r Photon and charged-lepton interactions with hadrons

Copyright information

© Società Italiana di Fisica and Springer-Verlag 2008

Authors and Affiliations

  1. 1.Department of PhysicsCarnegie Mellon UniversityPittsburghUSA