Realization of lattice QCD+QED simulation at the physical point and calculation of proton charge radius

2014 Fiscal Year Final Research Report

• Project/Area Number: 24740143
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: University of Tsukuba
• Principal Investigator: UKITA Naoya 筑波大学, 計算科学研究センター, 研究員 (50422192)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 格子ゲージ理論 / 非摂動効果 / 物理点 / 数値計算

Outline of Final Research Achievements

The effect of isospin symmetry breaking was ignored in traditional lattice QCD calculations because it was expected to be small compared to their statistical errors. But in recent precise numerical calculations, we can no longer ignore the effect. There are several previous attempts. They consider the effect partially or are done away the physical point.
The aim of this project is the realization of calculations at the physical point, which include the full effect of isospin symmetry breaking. We realized it and estimated the quark masses.

Free Research Field

素粒子物理学