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arXiv 1208.2657nucl-th
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N3LO手征核子-核子相互作用的无限截止重整化

Infinite-cutoff renormalization of the chiral nucleon-nucleon interaction at N3LO

Ch. Zeoli, R. Machleidt, D. R. Entem

摘要:

简单地说,重整化的“最佳”方法是将动量截止取到无穷大,同时由于反项的截止相关调整而保持稳定的结果。我们将这种重整化方法应用于核子-核子散射的非微扰计算中,得到了次-首阶(N3 LO)的手征核子-核子(NN)散射相移。对于较低的分波,我们发现,要么是没有收敛与增加的顺序,或者,如果收敛发生,结果并不总是收敛到经验值。对于更高的分波,我们总是观察到收敛到经验相移(除了3G 5状态)。此外,无论阶数是多少,每个分波都可以只使用一个或不使用反项,这就产生了一个相当不稳定的功率计数方案,不允许对预测进行系统的逐阶改进。结论是,无限截断重整化是不适合手征NN相互作用,这不应该是一个惊喜,因为手征有效场论,这些相互作用的基础上,是专为低于手征对称性破缺尺度约1 GeV的动量。因此,硬标度的这个值也应该被认为是动量截止的适当上限。

英文摘要:

Naively, the "best" method of renormalization is the one where a momentum cutoff is taken to infinity while maintaining stable results due to a cutoff-dependent adjustment of counterterms. We have applied this renormalization method in the non-perturbative calculation of phase-shifts for nucleon-nucleon (NN) scattering using chiral NN potentials up to next-to-next-to-next-to-leading order (N3LO). For lower partial waves, we find that there is either no convergence with increasing order or, if convergence occurs, the results do not always converge to the empirical values. For higher partial waves, we always observe convergence to the empirical phase shifts (except for the 3G5 state). Furthermore, no matter what the order is, one can use only one or no counterterm per partial wave, creating a rather erratic scheme of power counting that does not allow for a systematic order-by-order improvement of the predictions. The conclusion is that infinite-cutoff renormalization is inappropriate for chiral NN interactions, which should not come as a surprise, since the chiral effective field theory, these interactions are based upon, is designed for momenta below the chiral-symmetry breaking scale of about 1 GeV. Therefore, this value for the hard scale should also be perceived as the appropriate upper limit for the momentum cutoff.

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