arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1111.0513nucl-th
收藏

奇异S=-2重子-重子相互作用的散射长度

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

A. M. Gasparyan, J. Haidenbauer, C. Hanhart

摘要:

我们重新考虑一种基于色散理论的方法,该方法允许从生产反应中相应的末态相互作用中提取任何两重子系统的散射长度。讨论了该方法在奇异数S=-2和S=-3的重子-重子系统中的应用。对于反应K^- d -> K^0 λ λ以及λ λ与Xi N通道的耦合的特定情况,研究了由于存在具有附近阈值的非弹性通道而引起的理论不确定性。通过各种偏振测量,我们可以对K^- d和γ d散射中的几个生成反应进行分析,从而证明了解开自旋三重态和自旋单重态散射长度的可能性。利用该方法,从反应^{12}C(K^-,K^+ λ λ X)的λ λ不变质量数据,导出了α(λ λ)=-1.2 \pm 0.6 fm的1 S 0散射长度。

英文摘要:

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 -> 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 1S0 scattering length of a(Lambda Lambda)=-1.2\pm 0.6 fm is deduced.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑