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タイトル: Derivative expansion in the HAL QCD method for a separable potential
著者: Aoki, Sinya
Yazaki, Koichi
著者名の別形: 青木, 愼也
キーワード: B64 Lattice QCD
B69 Other topics in strong interactions and related phenomena
D34 Lattice QCD calculations in nuclear physics
発行日: Mar-2022
出版者: Oxford University Press (OUP)
The Physical Society of Japan
誌名: Progress of Theoretical and Experimental Physics
巻: 2022
号: 3
論文番号: 033B04
抄録: We investigate how the derivative expansion in the HAL QCD method works to extract physical observables, using a separable potential in quantum mechanics, which is solvable but highly non-local in the coordinate system. We consider three cases for inputs to determine the HAL QCD potential in the derivative expansion: (1) energy eigenfunctions, (2) time-dependent wave functions as solutions to the time-dependent Schrödinger equation with some boundary conditions, and (3) a time-dependent wave function made by a linear combination of a finite number of eigenfunctions at low energy to mimic the finite volume effect. We have found that, for all three cases, the potentials provide reasonable scattering phase shifts even at the leading order of the derivative expansion, and they give more accurate results as the order of the expansion increases. By comparing the above results with those from the formal derivative expansion for the separable potential, we conclude that the derivative expansion is not a way to obtain the potential but a method to extract physical observables such as phase shifts and binding energies, and that the scattering phase shifts from the derivative expansion in the HAL QCD method converge to the exact ones much faster than those from the formal derivative expansion of the separable potential.
著作権等: © The Author(s) 2021. Published by Oxford University Press on behalf of the Physical Society of Japan.
This is an Open Access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited. Funded by SCOAP3
URI: http://hdl.handle.net/2433/281680
DOI(出版社版): 10.1093/ptep/ptab168
出現コレクション:学術雑誌掲載論文等

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