2013 Fiscal Year Final Research Report
Study of K meson decay amplitudes from the lattice QCD
| Project/Area Number |
23340054
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Particle/Nuclear/Cosmic ray/Astro physics
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| Research Institution | University of Tsukuba |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
UKAWA Akira 筑波大学, 数理物質系, 教授 (10143538)
YOSHIE Tomoteru 筑波大学, 数理物質系, 准教授 (40183991)
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| Co-Investigator(Renkei-kenkyūsha) |
ISHIKAWA Kennichi 広島大学, 理学研究科, 准教授 (60334041)
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| Project Period (FY) |
2011-04-01 – 2014-03-31
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| Keywords | 格子場の理論 / 素粒子標準模型 / K中間子崩壊振幅 / ΔI=1/2則 / CP非保存パラメータ |
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| Research Abstract |
An aim of this project is a study of the Delta I=1/2 rule in the neutral K meson system and a calculation of the CP violation parameter from the Standard model of the particle physics by a lattice calculation of the K meson decay amplitudes. We consider the K meson decay process to the zero momentum two pion. Our calculations are carried out at the pion mass 280 MeV. We found that our methods are efficient for a calculation of the decay amplitudes Re(A0) and Re(A2). Our result is Re(A0)/Re(A2)=24.7(14.7) and the enhancement of Delta I=1/2 process is shown. From this, understanding of the Delta I=1/2 rule by calculations with our method at near physical point is expected in the future.
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