Monday, January 30, 2012

1201.5598 (K. Nakayama et al.)

Model-independent determination of the parity of $Ξ$ resonances    [PDF]

K. Nakayama, Yongseok Oh, H. Haberzettl
Based on reflection symmetry in the reaction plane, it is shown that
measuring the transverse spin-transfer coefficient $K_{yy}$ in the $\bar{K}N
\to K\Xi$ reaction directly determines the parity of the produced cascade
hyperon in a model-independent way as $\pi_\Xi^{}=K_{yy}$, where
$\pi_\Xi^{}=\pm 1$ is the parity. This result based on Bohr's theorem provides
a completely general, universal relationship that applies to the entire hyperon
spectrum. The feasibility of such measurements is also discussed. A similar
expression is obtained for the photoreaction $\gamma N \to K K \Xi$ by
measuring both the double-polarization observable $K_{yy}$ and the photon-beam
asymmetry $\Sigma$.
View original: http://arxiv.org/abs/1201.5598

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