Document Type

Article

Publication Date

2007

DOI

10.1103/PhysRevC.75.035205

Publication Title

Physical Review C

Volume

75

Issue

3

Pages

1-25

Abstract

Spin transfer from circularly polarized real photons to recoiling hyperons has been measured for the reactions γ + p → K+ + Λ and γ+p → K+ + Σ0. The data were obtained using the CEBAF Large Acceptance Spectrometer (CLAS) detector at the Jefferson Lab for center-of-mass energies W between 1.6 and 2.53 GeV, and for -0.85 < cos θc.m.K+ < +0.95. For the Λ, the polarization transfer coefficient along the photon momentum axis, Cz, was found to be near unity for a wide range of energy and kaon production angles. The associated transverse polarization coefficient Cx is smaller than Cz by a roughly constant difference of unity. Most significantly, the total Λ polarization vector, including the induced polarization P, has magnitude consistent with unity at all measured energies and production angles when the beam is fully polarized. For the Σ0 this simple phenomenology does not hold. All existing hadrodynamic models are in poor agreement with these results.

Comments

© 2007 American Physical Society

"Yes, the author or the author's employer may use all or part of the APS published article, including the APS-prepared version (e.g., the PDF from the online journal) without revision or modification, on the author's or employer's website as long as a fee is not charged. If a fee is charged, then APS permission must be sought. In all cases, the appropriate bibliographic citation and notice of the APS copyright must be included."

Publisher's version available at: https://doi.org/10.1103/PhysRevC.75.035205

Original Publication Citation

Amaryan, M.J., Bültmann, S., Dodge, G.E., Hyde-Wright, C.E., Kuhn, S.E., Weinstein, L., et al., CLAS Collaboration (2007). First measurement of beam-recoil observables Cx and Cz in hyperon photoproduction. Physical Review C, 75(3), 1-25, Article 035205. https://doi.org/10.1103/PhysRevC.75.035205

ORCID

0000-0003-1582-2376 (Dodge), 0000-0001-7282-8120 (Hyde-Wright), 0000-0003-2243-6836 (Kuhn), 0000-0001-5416-2900 (Weinstein)

Share

COinS