Scattering lengths of strangeness S =-2 baryon-baryon interactions

作者：Gasparyan A M^*; Haidenbauer J; Hanhart C

来源：Physical Review C, 2012, 85(1): 015204.

DOI：10.1103/PhysRevC.85.015204

We reconsider a method based on dispersion theory that allows one to extract the scattering length of any two-baryon system from corresponding final-state interactions in production reactions. The application of the method to baryon-baryon systems with strangeness S = -2 and S = -3 systems is discussed. Theoretical uncertainties due to the presence of inelastic channels with near-by thresholds are examined for the specific situation of the reaction K(-) d --%26gt; K(0) Lambda Lambda and the coupling of Lambda Lambda to the Xi N channel. The possibility to disentangle spin-triplet and spin-singlet scattering lengths by means of various polarization measurements is demonstrated for several production reactions in K(-) d and gamma d scattering. Employing the method to available data on the Lambda Lambda invariant mass from the reaction (12)C(K(-), K(+) Lambda Lambda X), a (1)S(0) scattering length of a(Lambda Lambda) = -1.2 +/- 0.6 fm is deduced.

• 出版日期2012-1-20