The dynamical diquark model: first numerical results
The dynamical diquark model: first numerical results
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DOI：
10.1007/jhep05(2019)061
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发表时间：
2019-03
影响因子：
5.4
通讯作者：
Jesse F. Giron;R. Lebed;C. Peterson
中科院分区：
文献类型：
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作者：
Jesse F. Giron;R. Lebed;C. Peterson
我们对多夸克奇异强子的动力学双夸克模型进行了首次数值预测。使用在晶格上数值计算的玻恩-奥本海默势，我们求解薛定谔方程的耦合和非耦合系统，以获得在此阶段自旋和同位旋简并的多重态的质量特征值。假设这些精细结构分裂的合理值，我们获得了一系列具有共同宇称本征值的奇异态能带，它们与实验观察到的类粲素态非常吻合，并且我们预测了许多其他未观察到的态。特别是，最适合已知五夸克态的拟合预测了低于粲素加核子阈值的态。最后，我们检查了奇异物质的玻恩-奥本海默衰变选择规则的最严格形式，发现它们严重失败，我们提出了一种解决方案，放宽了奇异物质必须作为重夸克自旋对称本征态出现的约束。
We produce the first numerical predictions of the dynamical diquark model of multiquark exotic hadrons. Using Born-Oppenheimer potentials calculated numerically on the lattice, we solve coupled and uncoupled systems of Schrödinger equations to obtain mass eigenvalues for multiplets of states that are, at this stage, degenerate in spin and isospin. Assuming reasonable values for these fine-structure splittings, we obtain a series of bands of exotic states with a common parity eigenvalue that agree well with the experimentally observed charmoniumlike states, and we predict a number of other unobserved states. In particular, the most suitable fit to known pentaquark states predicts states below the charmonium-plus-nucleon threshold. Finally, we examine the strictest form of Born-Oppenheimer decay selection rules for exotics and, finding them to fail badly, we propose a resolution by relaxing the constraint that exotics must occur as heavy-quark spin-symmetry eigenstates.