| Item type |
デフォルトアイテムタイプ_（フル）(1) |
| 公開日 |
2023-03-18 |
| タイトル |
|
|
タイトル |
Neutron electric dipole moment from lattice QCD |
|
言語 |
en |
| 作成者 |
CP-PACS, Collaboration
Shintani, E
Aoki, S
Ishizuka, N
Kanaya, K
Kikukawa, Y
Kuramashi, Y
Okawa, Masanori
Taniguchi, Y
Ukawa, A
Yoshié, T
|
| アクセス権 |
|
|
アクセス権 |
open access |
|
アクセス権URI |
http://purl.org/coar/access_right/c_abf2 |
| 権利情報 |
|
|
権利情報 |
Copyright (c) 2005 The American Physical Society |
| 主題 |
|
|
主題Scheme |
NDC |
|
主題 |
420 |
| 内容記述 |
|
|
内容記述 |
We carry out a feasibility study for the lattice QCD calculation of the neutron electric dipole moment (NEDM) in the presence of the theta term. We develop the strategy to obtain the nucleon EDM from the CP-odd electromagnetic form factor F3 at small theta, in which NEDM is given by limq2-->0thetaF3(q2)/(2mN), where q is the momentum transfer and mN is the nucleon mass. We first derive a formula which relates F3, a matrix element of the electromagnetic current between nucleon states, with vacuum expectation values of nucleons and/or the current. In the expansion of theta, the parity-odd part of the nucleon-current-nucleon three-point function contains contributions not only from the parity-odd form factors but also from the parity-even form factors multiplied by the parity-odd part of the nucleon two-point function, and, therefore, the latter contribution must be subtracted to extract F3. We then perform an explicit lattice calculation employing the domain-wall quark action with the renormalization group improved gauge action in quenched QCD at a-1~=2 GeV on a 163×32×16 lattice. At the quark mass mfa=0.03, corresponding to mpi/mrho~=0.63, we accumulate 730 configurations, which allow us to extract the parity-odd part in both two- and three-point functions. Employing two different Dirac gamma matrix projections, we show that a consistent value for F3 cannot be obtained without the subtraction described above. We obtain F3(q2~=0.58 GeV2)/(2mN)=-0.024(5)e·fm for the neutron and F3(q2~=0.58 GeV2)/(2mN)=0.021(6)e·fm for the proton. |
|
言語 |
en |
| 出版者 |
|
|
出版者 |
The American Physical Society |
| 言語 |
|
|
言語 |
eng |
| 資源タイプ |
|
|
資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
|
資源タイプ |
journal article |
| 出版タイプ |
|
|
出版タイプ |
VoR |
|
出版タイプResource |
http://purl.org/coar/version/c_970fb48d4fbd8a85 |
| 関連情報 |
|
|
関連タイプ |
isVersionOf |
|
|
識別子タイプ |
DOI |
|
|
関連識別子 |
http://dx.doi.org/10.1103/PhysRevD.72.014504 |
| 収録物識別子 |
|
|
収録物識別子タイプ |
ISSN |
|
収録物識別子 |
0031-9007 |
| 開始ページ |
|
|
開始ページ |
014504 |
| 書誌情報 |
Physical Review Letters
Physical Review Letters
巻 72,
p. 014504,
発行日 2005
|
| 旧ID |
14599 |
014504APS.pdf (309.8 KB)
