Recoil Polarization in $K^+Y$ Electroproduction in the Nucleon Resonance Region with CLAS12
nucl-ex
/ Authors
D. S. Carman, A. D'Angelo, L. Lanza, V. I. Mokeev, P. Achenbach, J. S. Alvarado, M. J. Amaryan, H. Atac, H. Avakian, N. A. Baltzell
and 120 more authors
L. Barion, M. Bashkanov, M. Battaglieri, F. Benmokhtar, A. Bianconi, A. S. Biselli, M. Bondi, S. Boiarinov, F. Bossu, K. -Th. Brinkmann, W. J. Briscoe, S. Bueltmann, V. D. Burkert, T. Cao, R. Capobianco, A. Celentano, P. Chatagnon, V. Chesnokov, G. Ciullo, P. L. Cole, M. Contalbrigo, N. Dashyan, R. De Vita, A. Deur
/ Abstract
Hyperon recoil polarization measurements for the exclusive electroproduction of $K^+Λ$ and $K^+Σ^0$ final states from an unpolarized proton target have been carried out using the CLAS12 spectrometer at Jefferson Laboratory. The measurements at beam energies of 6.535~GeV and 7.546~GeV span the range of four-momentum transfer $Q^2$ from 0.3 to 4.5~GeV$^2$ and invariant mass $W$ from 1.6 to 2.4~GeV, while covering the full center-of-mass angular range of the $K^+$. These new $Λ$ polarization observables extend the existing data in a similar kinematic range but from a significantly larger dataset. However, they represent the first electroproduction measurements of this observable for the $Σ^0$. These data will allow for better exploration of the reaction mechanism in strangeness production, for further understanding of the spectrum and structure of excited nucleon states that couple to $KY$, and for improved insight into the strong interaction in the non-perturbative domain.