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Negative parity baryons in the 1/N_c expansion : the quark excitation versus the meson-nucleon resonance picture

机译:1 / N_c展开中的负奇偶重子:夸克激发与介子核共振图

摘要

In order to better understand the fundamental issue regarding the compatibility between the quark-shell picture and that of resonances in meson-nucleon scattering in large $N_c$ QCD we extend the work of Cohen and Lebed on mixed symmetric $\ell $ = 1 baryons to analyze excited states with $\ell $ = 3. We give an explicit proof on the degeneracy of mass eigenvalues of a simple Hamiltonian including operators up to order $\mathcal{O}(N^0_c)$ \emph{i. e.} neglecting $1/N_c$ corrections in the quark-shell picture in the large $N_c$ limit. We obtain three degenerate multiplets formed of $\ell = 3$ states, as in the case of $\ell $ = 1 baryons. The compatibility between this picture and that of resonances in meson-nucleon scattering is discussed in the light of the present results.
机译:为了更好地了解夸克壳图片与大$ N_c $ QCD中介子核子散射共振的相容性的基本问题,我们扩展了Cohen和Lebed在混合对称$ \ ell $ = 1重子上的工作。来分析具有$ \ ell $ = 3的激发态。我们给出了一个简单哈密顿量的特征值的简并性证明,其中包括哈密顿算子,最高阶为\\ mathcal {O}(N ^ 0_c)$ \ emph {i。 e。}在$ N_c $的较大限制中忽略了夸克壳图中的$ 1 / N_c $校正。我们获得了由$ \ ell = 3 $状态形成的三个简并多重峰,就像在$ \ ell $ = 1重子的情况下一样。鉴于目前的结果,讨论了该图片与介子-核子散射中谐振的图片之间的兼容性。

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