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arXiv 2409.09388nucl-thhep-lathep-phnucl-ex
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重重子SU(3)手征微扰理论中含十重态贡献的π-核子散射

Pion-nucleon scattering with decuplet contribution in heavy baryon SU(3) chiral perturbation theory

Jing Ou-Yang, Bo-Lin Huang

AI总结:

本研究在重重子SU(3)手征微扰理论中计算含十重态贡献的π-核子散射到ε³阶的完整T矩阵,拟合确定低能常数后得到KN σ项等结果,对相移描述极佳,还讨论了方法收敛性。

摘要:

我们在重重子SU(3)手征微扰理论框架下,计算了到$\u003cstrong\u003eO\u003c/strong\u003e(ε^3)$阶、含十重态贡献的π-核子散射完整$T$矩阵。手征极限下的重子质量$M_0$及低能常数,通过同时拟合$πN$相移、实验测得的八重态重子质量以及$σ_{πN}$值确定。利用这些常数,我们得到$KN$ $σ$项:$σ_{KN}^{(1)}=(375.07\backslashpm33.02)$ MeV、$σ_{KN}^{(2)}=(275.32\backslashpm32.24)$ MeV,其误差仅为统计误差。该方法对所有分波相移均实现了极佳描述,我们还给出了散射长度和散射体积的结果,此外也讨论了该方法的收敛性。

英文摘要:

We calculate the complete $T$ matrices with decuplet contributions for pion-nucleon scattering to order $\mathcal{O}(ε^3)$ in heavy baryon SU(3) chiral perturbation theory. The baryon mass in the chiral limit $M_0$ and the low-energy constants are determined by fitting to phase shifts of $πN$, the experimental octet-baryon masses, and the value of $σ_{πN}$ simultaneously. By using these constants, we obtain the $KN$ $σ$ terms, $σ_{KN}^{(1)}=(375.07\pm33.02)$ MeV and $σ_{KN}^{(2)}=(275.32\pm32.24)$ MeV, with the errors being only statistical. An excellent description of the phase shifts is obtained for all partial waves. We also present results for scattering lengths and scattering volumes. In addition, the convergence of the approach is also discussed.

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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