(English) Polarization observable measurements for γp → K+Λ and γp → K+Σ° for energies up to 1.5 GeV

Beam asymmetries and hyperon recoil polarizations for the reactions γ p → K ⁺Λ and γ p → K ⁺Σ⁰ have been measured from the threshold production to 1500MeV with the GRAAL facility located at the ESRF in Grenoble.These results complement the database for the beam asymmetry, covering for the first time the production threshold region. Recent theoretical analyses are presented for which the beam asymmetry data bring interesting new information and allow to better determine some resonance parameters. Most importantly, these results strengthen the need of a new D₁₃ state around 1900MeV.

_______

A. Lleres, O. Bartalini, V. Bellini, J. P. Bocquet, P. Calvat, M. Capogni, L. Casano, M. Castoldi, A. D’Angelo, J. P. Didelez, R. Di Salvo, A. Fantini, C. Gaulard, G. Gervino, F. Ghio, B. Girolami, A. Giusa, M. Guidal, E. Hourany, V. Kouznetsov, R. Kunne, A. Lapik, P. Levi Sandri, D. Moricciani, A. N. Mushkarenkov, V. Nedorezov, L. Nicoletti, C. Perrin, C. Randieri, D. Rebreyend, F. Renard, N. Rudnev, T. Russew, G. Russo, C. Schaerf, M. L. Sperduto, M. C. Sutera, A. Turinge (2007).

The European Physical Journal A, Hadrons and Nuclei – January 2007, Vol. 31, Issue 1, pp. 73-93, ISSN: 1434-6001, doi: 10.1140/epja/i2006-10167-8.

________

The European Physical Journal (EPJ) is a series of peer-reviewed journals indexed in all major citation databases, and covering the whole spectrum of pure and applied physics, including related interdisciplinary subjects. In particular, The European Physical Journal A (EPJ A) presents new and original research results in Hadron physics and Nuclear physics, in a variety of formats, including Regular Articles, Reviews, Tools for Experiment and Theory/Scientific Notes and Letters.