Innovation of calculation method of QCD contribution to the muon g-2 by lattice QCD simulation

2015 Fiscal Year Final Research Report

• Project/Area Number: 25610053
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Nagoya University
• Principal Investigator: Hayakawa Masashi 名古屋大学, 理学(系)研究科(研究院), 准教授 (20270556)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: magnetic moment of muon / QCD contribution / lattice QCD simulation

Outline of Final Research Achievements

The hadronic light-by-light scattering contribution is one of the QCD contribution which could be significant to the muon g-2, but has been only estimated by the hadronic model calculation. The standard model prediction containing the result obtained as such disagrees with the experimental value of the muon g-2. Before concluding that this difference should come from the unknown structure not included in the standard model, it is quite important to calculate the hadronic light-by-light scattering contribution by the lattice QCD simulation. We demonstrated the feasibility of our method invented to simulate the contribution induced from the connected-type hadronic light-by-light scattering diagram, and reported the first lattice QCD result for this contribution.I also proposed one idea for the method that computes all contribution including disconnected-type diagrams.

Free Research Field

素粒子理論