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arXiv 1506.02183hep-phnucl-th
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核介质中的正负宇称超子

Positive and negative parity hyperons in nuclear medium

K. Azizi, N. Er, H. Sundu

摘要:

利用QCD求和规则方法研究了核介质对正宇称和负宇称$Σ$、$Λ$和$Ξ$超子的留数、质量和自能的影响.在计算中,采用了具有任意混合参数的超子的一般插值流。我们比较了在介质中和真空中的结果,并计算了相应参数的变化。结果表明,除了正宇称$Σ$超子的核物质中的剩余子的核物质中的核物质中的剩余子的核物质中的核物质中的剩余子的核物质中的核物质中的剩余子的核物质中的核物质中的核物质的核物质中的核物质的核这些重子的质量移动是负的。负宇称态的残基和质量的位移比正宇称态的大。最大位移属于负宇称$Λ$超子的留数。与负宇称重子的矢量自能相比,正宇称重子获得的矢量自能较大。矢量自能的最大值属于正宇称$Σ$超子。数值与文献中现有的预测进行了比较。

英文摘要:

The effects of nuclear medium on the residue, mass and self energy of the positive and negative parity $Σ$, $Λ$ and $Ξ$ hyperons are investigated using the QCD sum rule method. In the calculations, the general interpolating currents of hyperons with an arbitrary mixing parameter are used. We compare the results obtained in medium with those of the vacuum and calculate the shifts in the corresponding parameters. It is found that the shifts on the residues in nuclear matter are over all positive for both the positive and negative parity hyperons, except for the positive parity $Σ$ hyperon that the shift is negative. The shifts on the masses of these baryons are obtained to be negative. The shifts on the residues and masses of negative parity states are large compared to those of positive parities. The maximum shift belongs to the residue of the negative parity $Λ$ hyperon. The vector self-energies gained by the positive parity baryons are large compared to the negative parities' vector self-energies. The maximum value of the vector self-energy belongs to the positive parity $Σ$ hyperon. The numerical values are compared with the existing predictions in the literature.

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。

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