中文

双夸克状态混合

高能物理 - 唯象学 2008-11-26 v2 高能物理 - 实验

摘要

存在实验证据表明窄态Θ⁺和Θ_c存在,其量子数与uudd\bar{s}和uudd\bar{c}双夸克状态以及NK^{(*}和ND^{(*}分子态相同。它们的质量偏离许多关于纯双夸克和分子态的理论估计。本文研究Θ⁺和Θ_c可能是纯双夸克和分子态混合的可能性。混合参数通常与非微扰QCD相关,这些参数目前无法计算。我们通过拟合已知状态的数据来确定这些参数,然后将该机制推广到Θ_b以预测其质量和宽度。这种混合机制也能自然解释Θ⁺和Θ_c的窄宽度,通过在双夸克和分子态具有更大衰变宽度的情况下产生破坏性干涉。我们还简要讨论了Θ⁺和Θ_c的伴随本征态的性质以及它们被实验观察到的可能性。此外,也讨论了多状态混合的可能后果。

关键词

引用

@article{arxiv.hep-ph/0502235,
  title  = {Effects of Final-state Interactions on Mixing-induced CP Violation in Penguin-dominated B Decays},
  author = {Hai-Yang Cheng and Chun-Khiang Chua and Amarjit Soni},
  journal= {arXiv preprint arXiv:hep-ph/0502235},
  year   = {2008}
}

备注

23 pages, 1 figure. Table I is updated with the new Belle measurements. Detailed discussions on theoretical uncertainties are given and their numerical estimates are included in Tables II-V. CP asymmetries in the modes \rho^0 K_S and \eta K_S are also discussed. We clarify and stress that merging with QCDF does not cause a double counting problem