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arXiv 0807.0524nucl-thnucl-ex
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pp -> ppK +K-反应中的耦合通道效应

Coupled-channel effects in the pp -> ppK+K- reaction

A. Dzyuba, M. Buescher, M. Hartmann, I. Keshelashvili, V. Koptev, Y. Maeda, A. Sibirtsev, H. Stroeher, C. Wilkin

摘要:

在COSY-ANKE装置上,在三种束流能量2.65、2.70和2.83 GeV下测量了pp -> ppK+K-反应的截面。在低不变质量的K+K-谱的形状在很大程度上反映了K \bar{K}末态相互作用的重要性。结果表明,这些数据可以理解的弹性K+K-再散射加上贡献来自生产的一个K 0 \bar{K} 0对随后的电荷交换再散射。虽然这些数据还不足以确定在K 0 \bar{K} 0阈值时尖点的大小,但低质量行为表明,同位旋零的产生占主导地位。

英文摘要:

The cross sections for the pp -> ppK+K- reaction were measured at three beam energies 2.65, 2.70, and 2.83 GeV at the COSY-ANKE facility. The shape of the K+K- spectrum at low invariant masses largely reflects the importance of K\bar{K} final state interactions. It is shown that these data can be understood in terms of an elastic K+K- rescattering plus a contribution coming from the production of a K0\bar{K}0 pair followed by a charge-exchange rescattering. Though the data are not yet sufficient to establish the size of the cusp at the K0\bar{K}0 threshold, the low mass behaviour suggests that isospin-zero production is dominant.

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