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arXiv 1807.04746hep-lathep-phnucl-th
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$π^+π^+$和$π^+π^+π^+$体系的电子体积谱

Finite-volume spectrum of $π^+π^+$ and $π^+π^+π^+$ systems

Maxim Mai, Michael Doring

摘要:

对于阈值以上的三体系统,如奇异共振或重子谱的从头计算理解,需要将在格点量子色动力学计算中产生的有限体积本征值谱映射到无限体积。我们提出的第一个应用程序,这样的形式主义的物理系统的形式,三个相互作用的带正电的π介子。在非物理π质量下,基态能量的计算结果与现有的格点量子色动力学结果一致。外推到物理π介子质量使用输入从有效场论。预测了激发能谱。这表明了利用格点量子色动力学确定阈值以上的三体振幅的可行性,包括轴介子、奇异介子和激发重子的共振性质。

英文摘要:

The ab-initio understanding of hadronic three-body systems above threshold, such as exotic resonances or the baryon spectrum, requires the mapping of the finite-volume eigenvalue spectrum, produced in lattice QCD calculations, to the infinite volume. We present the first application of such a formalism to a physical system in form of three interacting positively charged pions. The results for the ground state energies agree with the available lattice QCD results by the NPLQCD collaboration at unphysical pion masses. Extrapolations to physical pion masses are performed using input from effective field theory. The excited energy spectrum is predicted. This demonstrates the feasibility to determine three-body amplitudes above threshold from lattice QCD, including resonance properties of axial mesons, exotics, and excited baryons.

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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