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arXiv 1002.2560nucl-th
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λ(1405)的单极性质和K-pp的结构

Single-pole nature of Lambda (1405) and structure of K-pp

Yoshinori Akaishi, Toshimitsu Yamazaki, Mitsuaki Obu, Masanobu Wada

摘要:

我们从λ(1405)是一个K-p准束缚态出发,用变分方法求解了K-pp的结构,λ * 的质量为1405 MeV/c ~ 2。K-pp的结构揭示了一个分子特征,即“原子中心”λ * 中的K-在与另一个质子产生强共价键中起着关键作用。深束缚的Kbar核系统是由这种“超强”核力形成的,这种“超强”核力是由于迁移的实玻色子Kbar,一种海特勒-伦敦-海森堡,它过度补偿了刚性核的不可压缩性。结合基于手征SU(3)动力学的λ(1405)双极图讨论了λ(1405)反相的理论背景。详细的分析揭示了可观测的λ(1405)的单极性质。实验上可观测到的σ π不变质量有两种,通常的T22不变质量和转换的T21不变质量。确定Lambda* 质量是1405 MeV还是1420 MeV是至关重要的。由氘核静止时的K吸收得到的T21不变质量可以提供关于这个λ * 质量问题的决定性信息。

英文摘要:

We have studied the structure of K- pp by solving this system in a variational treatment, starting from ansatz that Lambda(1405) is a K-p quasi-bound state, Lambda* with mass 1405 MeV/c2. The structure of K-pp reveals a molecular feature, namely, the K- in an "atomic center", Lambda*, plays a key role in producing strong covalent bonding with the other proton. Deeply bound Kbar nuclear systems are formed by this "super-strong" nuclear force due to migrating real bosons, Kbar, a la Heitler-London-Heisenberg, which overcompensates the stiff nuclear incompressibility. Theoretical background of the Lambda (1405) ansatz is discussed in connection with the double-pole picture of Lambda (1405) based on chiral SU(3) dynamics. Detailed analysis reveals single-pole nature of the observable Lambda (1405). There are two kinds of Sigma pi invariant masses experimentally observable, the usual T22 invariant mass and the conversion T21 invariant mass. It is of vital importance to determine whether the Lambda* mass is 1405 MeV or 1420 MeV. The T21 invariant mass from K- absorption at rest in deuteron can provide decisive information about this Lambda* mass problem.

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