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arXiv 1508.03048hep-lathep-ph
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从格点量子色动力学看奇异重子内部

A look inside charmed-strange baryons from lattice QCD

K. U. Can, G. Erkol, M. Oka, T. T. Takahashi

摘要:

在$32^3\times 64$ PACS-CS晶格上,用全量子色动力学方法计算了自旋为3/2的$Ω$重子,即$Ω$,$Ω_c^\ast$,$Ω_{cc}^\ast$和$Ω_{ccc}$的电磁形状因子.从$E0$和$M1$多极形状因子中提取电荷半径和磁矩。结果电四极形状因子,$E2$,也给出了。夸克扇区的贡献分别计算每个可观察的,然后结合起来,以获得重子的属性。我们发现,在电荷半径和磁矩的情况下,魅夸克的贡献系统地小于奇夸克的贡献。$Ω_{cc}^\ast$和$Ω_{ccc}$的$E2$矩提供了统计上显著的数据,从而得出它们的电荷分布变形为扁球形的结论。计算了自旋为1/2的$Ω_c$和$Ω_{cc}$重子的性质,并作了比较.这一完整的研究为粲强子中的重夸克动力学提供了有价值的线索。

英文摘要:

The electromagnetic form factors of the spin-3/2 $Ω$ baryons, namely $Ω$, $Ω_c^\ast$, $Ω_{cc}^\ast$ and $Ω_{ccc}$, are calculated in full QCD on $32^3\times 64$ PACS-CS lattices with a pion mass of 156(9) MeV. The electric charge radii and magnetic moments from the $E0$ and $M1$ multipole form factors are extracted. Results for the electric quadrupole form factors, $E2$, are also given. Quark sector contributions are computed individually for each observable and then combined to obtain the baryon properties. We find that the charm quark contributions are systematically smaller than the strange-quark contributions in the case of the charge radii and magnetic moments. $E2$ moments of the $Ω_{cc}^\ast$ and $Ω_{ccc}$ provide a statistically significant data to conclude that their electric charge distributions are deformed to an oblate shape. Properties of the spin-1/2 $Ω_c$ and $Ω_{cc}$ baryons are also computed and a thorough comparison is given. This complete study gives valuable hints about the heavy-quark dynamics in charmed hadrons.

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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