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arXiv 1906.07049hep-phhep-exnucl-th
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奇异$Ξ$重子在核子外的弱产生

Weak production of strange $Ξ$ baryons off the nucleon

M. Rafi Alam, I. Ruiz Simo

摘要:

本文研究了中、低能反中微子引起的荷电流Cabibbo抑制的核子伴随$K Ξ$产生。非共振项是用基于SU(3)手征拉格朗日量的微观模型得到的。模型的基本参数是由中子和超子的半轻子衰变分析得到的$f_π$、π介子衰变常数、Cabibbo角、质子和中子磁矩以及重子八重态的轴向矢量耦合常数D和F。此外,我们还考虑了$Σ^\ast(1385)$共振,当这个通道打开时,它可以衰减到$K Ξ$终态。所研究的机制是在反中微子能量约为$2$ GeV时产生$Ξ$的主要来源,并且在这些能量下计算的截面可以在当前和未来的中微子实验中测量。

英文摘要:

The charged current Cabibbo-supressed associated $K Ξ$ production off the nucleon induced by anti-neutrinos is studied at low and intermediate energies. The non-resonant terms are obtained using a microscopical model based on the SU(3) chiral Lagrangian. The basic parameters of the model are $f_π$, the pion decay constant, Cabibbo's angle, the proton and neutron magnetic moments and the axial vector coupling constants for the baryons octet, D and F, that are obtained from the analysis of the semileptonic decays of neutron and hyperons. In addition, we also consider $Σ^\ast(1385)$ resonance, which can decay in $K Ξ$ final state when this channel is open. The studied mechanism is the prime source of $Ξ$ production at anti-neutrino energies around $2$ GeV and the calculated cross sections at these energies can be measured at the current and future neutrino experiments.

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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