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arXiv 1104.5152hep-phhep-latnucl-th
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格点量子色动力学的激发态重子谱

Excited state baryon spectroscopy from lattice QCD

Robert G. Edwards, Jozef J. Dudek, David G. Richards, Stephen J. Wallace

摘要:

本文计算了动力学各向异性三叶草晶格上核子和δ激发态的能谱。介绍了一种构造算符的方法,该方法可以可靠地识别重子态的连续自旋,克服了立方晶格的对称性。使用这种方法,我们能够确定的单粒子状态的自旋高达并包括J = 7/2,两个宇称,这是第一次在晶格计算中实现。我们发现一个谱的状态识别为混合物的SU(6)× O(3)表示和计数的水平,是一致的非相对论性$qqq$组分夸克模型。这种稠密的光谱与夸克-双夸克模型对“共振缺失问题”的解决方案不相容,也没有显示出宇称加倍的迹象。

英文摘要:

We present a calculation of the Nucleon and Delta excited state spectrum on dynamical anisotropic clover lattices. A method for operator construction is introduced that allows for the reliable identification of the continuum spins of baryon states, overcoming the reduced symmetry of the cubic lattice. Using this method, we are able to determine a spectrum of single-particle states for spins up to and including J = 7/2, of both parities, the first time this has been achieved in a lattice calculation. We find a spectrum of states identifiable as admixtures of SU(6) x O(3) representations and a counting of levels that is consistent with the non-relativistic $qqq$ constituent quark model. This dense spectrum is incompatible with quark-diquark model solutions to the "missing resonance problem" and shows no signs of parity doubling of states.

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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