Document Type

Article

Publication Date

2014

DOI

10.1103/PhysRevC.90.035202

Publication Title

Physical Review C

Volume

90

Issue

3

Pages

035202 (16 pages)

Abstract

We have measured. the induced polarization of the Λ (1116) in the reaction epe′K+Λ , detecting the scattered e′ and K+ in the final state along with the proton from the decay Λ → pπ . The present study used the CEBAF Large Acceptance Spectrometer (CLAS), which allowed for a large kinematic acceptance in invariant energy W (1.6≤ W ≤ 2.7 GeV) and covered the full range of the kaon production angle at an average momentum transfer Q2 = 1.90GeV2 . In this experiment a 5.50-GeV electron beam was incident upon an unpolarized liquid-hydrogen target. We have mapped out the W and kaon production angle dependencies of the induced polarization and found striking differences from photoproduction data over most of the kinematic range studied. However, we also found that the induced polarization is essentially Q2 independent in our kinematic domain, suggesting that somewhere below the Q2 covered here there must be a strong Q2 dependence. Along with previously published photo- and electroproduction cross sections and polarization observables, these data are needed for the development of models, such as effective field theories, and as input to coupled-channel analyses that can provide evidence of previously unobserved s -channel resonances.

Comments

"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."

© American Physical Society

Original Publication Citation

CLAS Collaboration, Gabrielyan, M., Raue, B. A., Carman, D. S., Park, K., Adhikari, K. P., . . . Zonta, I. (2014). Induced polarization of Λ1116 in kaon electroproduction. Physical Review C, 90(3), 035202. doi:10.1103/PhysRevC.90.035202

ORCID

0000-0003-2243-6836 (Kuhn)

Share

COinS