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arXiv 0806.4917nucl-th
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基于手征SU(3)动力学的ppK ^-体系的变分计算

Variational calculation of the ppK^- system based on chiral SU(3) dynamics

Akinobu Doté, Tetsuo Hyodo, Wolfram Weise

摘要:

用变分方法研究了作为可能的准束缚Kbar核原型的ppK^-系统。几个版本的能量依赖的有效KbarN相互作用来自手征SU(3)动力学作为输入,连同一个现实的NN势(Av 18)。考虑到在KbarN阈值以下的外推中的理论不确定性,我们发现反K介子的二重子ppK^-没有被深度束缚。在驱动s波KbarN相互作用的情况下,所得到的总结合能为B(ppK^-)= 20 $\pm$ 3 MeV,并且预期涉及KbarN -> πY的介子衰变宽度在40 - 70 MeV的范围内。讨论了这种准束缚ppK^-系统的性质(如核子和反K介子的密度分布)。Λ(1405),作为Kbar和核子的I=0准束缚态,似乎在ppK^-团簇中幸存下来。对p波KbarN相互作用的影响和两核子吸收过程的宽度(KbarNN -> YN)进行了估计。考虑到这些效应和吸收的色散修正,ppK^-结合能预计在20 - 40 MeV范围内,而总衰变宽度可以达到100 MeV,但理论上有很大的不确定性。

英文摘要:

The ppK^- system, as a prototype for possible quasibound Kbar nuclei,is investigated using a variational approach. Several versions of energy dependent effective KbarN interactions derived from chiral SU(3) dynamics are employed as input, together with a realistic NN potential (Av18). Taking into account theoretical uncertainties in the extrapolations below the KbarN threshold, we find that the antikaonic dibaryon ppK^- is NOT deeply bound. With the driving s-wave KbarN interaction the resulting total binding energy is B(ppK^-) = 20 $\pm$ 3 MeV and the mesonic decay width involving KbarN -> πY is expected to be in the range 40 - 70 MeV. Properties of this quasibound ppK^- system (such as density distributions of nucleons and antikaon) are discussed. The Λ(1405), as an I=0 quasi-bound state of Kbar and a nucleon, appears to survive in the ppK^- cluster. Estimates are given for the influence of p-wave KbarN interactions and for the width from two-nucleon absorption (KbarNN -> YN) processes. With inclusionof these effects and dispersive corrections from absorption, the ppK^- binding energy is expected to be in the range 20 - 40 MeV, while the total decay width can reach 100 MeV but with large theoretical uncertainties.

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