标题： 晶格强子质量对外部磁场的依赖性 显示英文标题

标题： Dependence of Lattice Hadron Masses on External Magnetic Fields

摘要： 我们研究了在外加强度接近其自身质量的外加磁场中的强子质量变化。 我们确定了影响晶格模拟结果的主要因素：- 对于$eB << 2\pi / L^2 a^2$的边界不连续性。 - 强子波函数的 SU(6) 选择。 我们定性地证实了早期关于质量随磁场呈线性变化的理论假设，并且作为副产品，改进了核子磁矩的晶格测量。 然而，我们的系统误差和统计误差使我们无法测量理论上预测的质子比中子重的磁场强度。 显示英文摘要

摘要： We study the variation of the hadron masses in the presence of external magnetic fields of strength of the order of the masses themselves. We identify the main factors affecting the lattice simulation results: - the boundary discontinuities for $eB << 2\pi / L^2 a^2$. - the SU(6) choice of the hadron wave-function. We confirm qualitatively the earlier theoretical ansatz on the linear behaviour of the masses with the magnetic field and, as a by-product, we improve the lattice measurements of the nucleon magnetic moments. However our systematic and statistical errors preclude us from measuring the theoretically predicted field strength at which the proton becomes heavier than the neutron.