标题： deuteron的相对论结构：1.电离解离和γ scaling 显示英文标题

标题： Relativistic Structure of the Deuteron: 1.Electro-disintegration and y-scaling

摘要： 采用包含π、σ、ω、ρ、η和δ介子交换的真实相互作用核的自洽求解的狄拉克-萨尔佩特方程的自旋-自旋束缚态解，系统地研究了相对论效应在相对论冲量近似下的准弹性电子-氘核散射中。通过将非相对论标度函数推广到相对论情况来考虑相对论y-标度，表明y-标度确实出现在由动力学即时形式的能量守恒得出的标准相对论标度变量中。目前的y-标度方法是完全协变的，描述氘核时有八个分量，即 3S₁^{++}, 3S₁^{--}, 3D₁^{++}, 3D₁^{--}, 3P₁^{+-}, 3P₁^{-+}, 1P₁^{+-}, 1P₁^{-+}波。 结果表明，如果忽略负能态 1P_1 和 3P_1，则可以引入协变动量分布的概念 N(p_0,p)，其中 p_0 = M_D/2 -\sqrt{p^2+m^2}，并且使用这些分布计算的电离解算子截面与包含 1P_1 和 3P_1 态的精确计算结果在核子三动量 |p| <= 1 GeV/c 范围内相差不到百分之几；在这个动量范围内，证明了渐近相对论尺度函数与纵向协变动量分布相一致。 显示英文摘要

摘要： Realistic solutions of the spinor-spinor Bethe-Salpeter equation for the deuteron with realistic interaction kernel including the exchange of pi, sigma, omega, rho, eta and delta mesons, are used to systematically investigate relativistic effects in inclusive quasi-elastic electron-deuteron scattering within the relativistic impulse approximation. Relativistic y-scaling is considered by generalising the non relativistic scaling function to the relativistic case, and it is shown that y-scaling does occur in the usual relativistic scaling variable resulting from the energy conservation in the instant form of dynamics. The present approach of y-scaling is fully covariant, with the deuteron being described by eight components, viz. the 3S_1^{++}, 3S_1^{--}, 3D_1^{++}, 3D_1^{--}, 3P_1^{+-}, 3P_1^{-+}, 1P_1^{+-}, 1P_1^{-+} waves. It is demonstrated that if the negative relative energy states 1P_1, 3P_1 are disregarded, the concept of covariant momentum distributions N(p_0,p), with p_0=M_D/2-\sqrt{p^2+m^2}, can be introduced, and that calculations of lectro-disintegration cross section in terms of these distributions agree within few percents with the exact calculations which include the 1P_1, 3P_1 states, provided the nucleon three momentum |p|\<= 1 GeV/c; in this momentum range, the asymptotic relativistic scaling function is shown to coincide with the longitudinal covariant momentum distribution.