标题： 各向异性晶格上重杂化介子的自旋效应 显示英文标题

标题： Spin Effects in Heavy Hybrid Mesons on an Anisotropic Lattice

摘要： 我们通过使用改进的NRQCD哈密顿量，在各向异性晶格上进行了Landau平均链接 tadpole 改进的淬火计算，以确定最低的底重子杂化态。 我们研究了夸克自旋 s=0,1 部分，其中包含非奇异态 1-- 和奇异态 1-+，并展示了在最低阶哈密顿量的情况下它们的简并性。 这两种状态都位于 Υ 基态上方大约 1.6 GeV 处。 我们检查了几种杂化态的自旋分裂，这是由于NRQCD哈密顿量中的磁矩项引起的，而所有其他项的影响可以忽略不计。 自旋分裂在外误差范围内得到了很好的解析，并且出人意料地大，我们研究了它们依赖于磁场强度的程度。 我们使用杂化物的Born-Oppenheimer图计算了这些分裂的一个贡献，并表明这种效应的观察大小可以通过与具有多于一个组成胶子的杂化态混合来合理解释。 显示英文摘要

摘要： We present a quenched calculation of lowest bottomonium hybrid states on an anisotropic lattice with Landau mean-link tadpole improvement, using the improved NRQCD Hamiltonian. We investigate the quark-spin s=0,1 sectors, which contain both the non-exotic 1-- and the exotic 1-+, and demonstrate their degeneracy in the case of the lowest order Hamiltonian. Both states are found at around 1.6 GeV above the Upsilon ground state. We examine the spin-splitting for several hybrid states that is due to the magnetic moment term in the NRQCD Hamiltonian, all other terms having negligible effect. The spin splittings are well resolved outside errors and are surprisingly large, and we investigate their dependence on the strength of the magnetic term. We calculate one contribution to these splittings using the Born-Oppenheimer picture for hybrids and show that the observed size of the effect is plausibly explained by mixing with hybrid states with more than one constituent gluon.