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arXiv 0906.3822nucl-th
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双核子有效场论中的正则化、重整化和“操作化”

Regularization, renormalization and "peratization" in effective field theory for two nucleons

E. Epelbaum, J. Gegelia

摘要:

我们讨论了两核子系统的有效场论的重整化的概念方面。结果表明,与人们普遍认为的相反,重整化方案的散射振幅的依赖性只能被消除的顺序进行计算。我们进一步考虑了一个精确可解的量子力学模型的有效理论,该模型具有长程和短程相互作用以模拟pionful有效场论。我们讨论了低能量定理在这个模型中的意义,并证明了其有效性的计算与有限截止$Λ$,只要它是选择的硬标度的顺序的问题。通过取极限$Λ\to \infty$来去除截止产生散射振幅的有限结果,但违反了低能定理,因此与有效场论框架不兼容。

英文摘要:

We discuss conceptual aspects of renormalization in the context of effective field theories for the two-nucleon system. It is shown that, contrary to widespread belief, renormalization scheme dependence of the scattering amplitude can only be eliminated up to the order the calculations are performed. We further consider an effective theory for an exactly solvable quantum mechanical model which possesses a long- and short-range interaction to simulate pionful effective field theory. We discuss the meaning of low-energy theorems in this model and demonstrate their validity in calculations with a finite cutoff $Λ$ as long as it is chosen of the order of the hard scale in the problem. Removing the cutoff by taking the limit $Λ\to \infty$ yields a finite result for the scattering amplitude but violates the low-energy theorems and is, therefore, not compatible with the effective field theory framework.

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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