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arXiv 2501.09231nucl-thnucl-ex
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手征有效场论中核子-核子Wolfenstein振幅的逐阶不确定性

Order-by-order uncertainties of nucleon-nucleon Wolfenstein amplitudes in chiral effective field theory

B. McClung, Ch. Elster, D. R. Phillips

AI总结:

本研究利用BUQEYE合作组的高斯过程方法,分析手征有效场论下五个核子-核子Wolfenstein振幅的逐阶收敛性,推断出破缺标度约750-800 MeV,验证了除领头阶外截断不确定性的覆盖有效性。

摘要:

量子力学不变性原理决定了核子-核子(NN)相互作用中可能存在的最普遍算符结构。在壳NN振幅中存在五个独立算符以及五个对应的系数函数,这些系数函数的常用选择被称为NN Wolfenstein振幅。我们分析了手征有效场论($χ$EFT)的半局域坐标空间势实现所预测的五个NN Wolfenstein振幅各自的逐阶收敛性。我们在25至200 MeV的实验室动能下,针对中子-质子和质子-质子散射开展了此项分析。我们的分析采用了BUQEYE合作组开发的高斯过程方法来描述每个$χ$EFT阶的贡献,从而得到每个Wolfenstein振幅的截断不确定性,这些不确定性在不同散射角之间存在关联。我们结合EFT中不同阶数的大小信息,推断出每个振幅的$χ$EFT破缺标度,发现平均而言$Λ_b$在750至800 MeV之间。采用该$Λ_b$取值后,除领头阶外,EFT截断不确定性在所有阶数下都能很好地覆盖高阶结果和经验Wolfenstein振幅。

英文摘要:

Quantum mechanical invariance principles dictate the most general operator structure that can be present in the nucleon-nucleon (NN) interaction. Five independent operators appear in the on-shell NN amplitude together with five corresponding coefficient functions. The usual choice for these coefficient functions is known as the NN Wolfenstein amplitudes. We analyze the order-by-order convergence of each of the five NN Wolfenstein amplitudes predicted by a semi-local coordinate space potential implementation of chiral effective field theory ($χ$EFT). We do this at laboratory kinetic energies between 25 and 200 MeV for both neutron-proton and proton-proton scattering. Our analysis uses the Gaussian-Process methods developed by the BUQEYE collaboration to describe the contributions of each $χ$EFT order, and so yields truncation uncertainties for each Wolfenstein amplitude that are correlated across scattering angles. We combine information on the size of different orders in the EFT to infer the $χ$EFT breakdown scale for each amplitude, finding, on average, $Λ_b$ between 750 and 800 MeV. With this choice of $Λ_b$, the EFT truncation uncertainties cover both higher-order results and empirical Wolfenstein amplitudes well for all orders other than the leading order.

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