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arXiv 1902.07677nucl-th
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无介子有效场论中$A=3$束缚态矩阵元的计算

Calculation of an $A=3$ bound-state matrix element in pionless effective field theory

Hilla De-Leon, Lucas Platter, Doron Gazit

摘要:

在本文中,我们建立了一个计算$A=3$束缚态之间的无π介子矩阵元的一般框架。这个框架对于电弱观测量的无π介子计算是有用的,例如$^3$ H,$^3$ He磁矩和$^3$ H $β$衰变。本文从Bethe-Salpeter方程出发,证明了对于一个束缚态,三核子波函数归一化可以用一种等价于两个相同的三核子束缚态之间的单位算符的方式图解表示。单位矩阵元素的这种图解形式是构造一般算子的$A=3$矩阵元素的基础。我们表明,这种方法可用于计算由于库仑相互作用而导致的$^3$ H和$^3$ He之间的能量差,并计算由于有效距离修正而对$^3$ H和$^3$ He散射振幅的NLO修正。

英文摘要:

In this paper, we establish a general framework for calculating pionless matrix elements between $A=3$ bound-states up to next-to-leading-order. This framework is useful for pionless calculations of electroweak observables, such as $^3$H,$^3$He magnetic moments and $^3$H $β$ decay. Starting from a Bethe-Salpeter equation, we prove that for a bound-state, the three-nucleon wave-function normalization can be expressed diagrammatically in a way that is equivalent to the unit operator between two identical three-nucleon bound-states. This diagrammatic form of the identity matrix element is the foundation for constructing an $A=3$ matrix element of a general operator. We show that this approach can be used to calculate the energy difference between $^3$H and $^3$He due to the Coulomb interaction, and to calculate the NLO corrections to the $^3$H and $^3$He scattering amplitudes due to effective range corrections.

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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