Abstract
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 + p → K + + Λ, discussing recent measurements of C x , C z , 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.
Original article based on material presented at NSTAR 2007.
Paper reprinted from Eur. Phys. J. A with permission
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References
M. Jacob, G.C. Wick, Ann. Phys. (N.Y.) 7, 404 (1959).
I. S. Barker, A. Donnachie, J.K. Storrow, Nucl. Phys. B 95, 347 (1975).
CLAS Collaboration (R. Bradford, R.A. Schumacher et al.), Phys. Rev. C 75, 035205 (2007).
CLAS Collaboration (J.W.C. McNabb, R.A. Schumacher, L. Todor et al.), Phys. Rev. C 69, 042201(R) (2004).
R. A. Schumacher, Proceedings of the IX International Conference on Hypernuclear and Strange Particle Physics (HYP 2006), October 10–14, 2006, Mainz, Germany, edited by J. Pochodzalla, Th. Walcher (SIF and Springer-Verlag, 2007) p. 339, arXiv:nucl-ex/0611035.
GRAAL Collaboration (A. Lleres et al.), Eur. Phys. J. A 31, 79 (2007).
LEPS Collaboration (R.G.T. Zegers et al.), Phys. Rev. Lett. 91, 092001 (2003).
F. J. Klein, Proceedings of the Workshop on the Physics of Excited Nucleons, NStar2005, Tallahassee, FL, Oct. 2005, edited by S. Capstick, V. Crede, P. Eugenio (World Scientific, 2006) p. 159; arXiv:nucl-ex/0602004 (2006).
H. Schmieden, this conference.
G. R. Goldstein, J.F. Owens, J.P. Rutherfoord, M.J. Moravcsik, Nucl. Phys. B 80, 164 (1974).
R. P. Worden, Nucl. Phys. B 37, 253 (1972).
Wen-Tai Chiang, Frank Tabakin, Phys. Rev. C 55, 2054 (1997).
X. Artru, J.M. Richard, J. Soffer, Phys. Rev. C 75, 024002 (2007).
CLAS Collaboration (R. Bradford, R.A. Schumacher, J.W.C. McNabb, L. Todor et al.), Phys. Rev. C 73, 035202 (2006).
CLAS Collaboration (D.S. Carman et al.), Phys. Rev. Lett. 90, 131804 (2003). See also CLAS Collaboration (P. Ambrozewicz et al.), Phys. Rev. C 75, 045203 (2007).
GRAAL Experiment (A. Lleres), private communication.
K. H. Althoff et al., Nucl. Phys. B 137, 269 (1978).
See, for example, Eugen Merzbacher, Quantum Mechanics, 2nd edition (John Wiley and Sons, New York, 1970) p. 281.
A. Sarantsev, this conference; see also: A.V. Sarantsev, V.A. Nikonov, A.V. Anisovich, E. Klempt, U. Thoma, Eur. Phys. J. A 25, 441 (2005) and references therein.
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Schumacher, R. (2008). Polarization in hyperon photo- and electro-production. In: Hammer, HW., Kleber, V., Thoma, U., Schmieden, H. (eds) NSTAR 2007. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-85144-8_10
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DOI: https://doi.org/10.1007/978-3-540-85144-8_10
Publisher Name: Springer, Berlin, Heidelberg
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