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arXiv 0909.3974hep-ph
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考虑K+K-终态相互作用的近阈pp--> ppK +K-反应的广义Dalitz图分析

Generalized Dalitz Plot analysis of the near threshold pp-->ppK+K- reaction in view of the K+K- final state interaction

M. Silarski, P. Moskal, E. Czerwinski, R. Czyzykiewicz, D. Gil, D. Grzonka, L. Jarczyk, B. Kamys, A. Khoukaz, J. Klaja, P. Klaja, W. Krzemien, W. Oelert, J. Rit… 展开作者

M. Silarski, P. Moskal, E. Czerwinski, R. Czyzykiewicz, D. Gil, D. Grzonka, L. Jarczyk, B. Kamys, A. Khoukaz, J. Klaja, P. Klaja, W. Krzemien, W. Oelert, J. Ritman, T. Sefzick, M. Siemaszko, J. Smyrski, A. Taschner, P. Winter, M. Wolke, P. Wustner, M. Zielinski, W. Zipper, J. Zdebik

摘要:

$pp\to ppK^+K^-$反应的激发函数显示出接近阈值的显著增强,这可能归因于$pK^-$和$K^+K^-$终态相互作用的影响。在一个改进的再分析COSY-11数据的$pp\to ppK^+K^-$反应在过剩能量Q = 10 MeV和28 MeV,包括质子-K相互作用的增强被证实。不变的质量分布的两个和三个粒子子系统允许测试在低过剩能量的ananterior和参数的描述中的相互作用的ppK+K-系统来自COSY-ANKE数据。最后,基于低能K+K不变质量分布和广义Dalitz图分析,我们首次估计了K+K相互作用的散射长度为:|Re(a_K^+K^-)|= 0.5 + 4.0 - 0.5 fm和Im(a_K^+K^-)= 3.0 +- 3.0 fm。

英文摘要:

The excitation function for the $pp\to ppK^+K^-$ reaction revealed a significant enhancement close to threshold which may plausibly be assigned to the influence of the $pK^-$ and $K^+K^-$ final state interactions. In an improved reanalysis of COSY-11 data for the $pp\to ppK^+K^-$ reaction at excess energies of Q = 10 MeV and 28 MeV including the proton-K- interaction the enhancement is confirmed. Invariant mass distributions for the two- and three-particle subsystems allow to test at low excess energies the ansatz and parameters for the description of the interaction in the ppK+K- system as derived from the COSY-ANKE data. Finally, based for the first time on the low energy K+K- invariant mass distributions and the generalized Dalitz plot analysis, we estimate the scattering length for the K+K- interaction to be |Re(a_K^+K^-)| = 0.5 + 4.0 -0.5 fm and Im(a_K^+K^-) = 3.0 +- 3.0 fm.

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