Road toward the next standard model explored with muon precision physics

2018 Fiscal Year Final Research Report

• Project/Area Number: 16K05323
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: High Energy Accelerator Research Organization (2017-2018); Kagawa National College of Technology (2016)
• Principal Investigator: Nomura Daisuke 大学共同利用機関法人高エネルギー加速器研究機構, 素粒子原子核研究所, 研究員 (40583555)
• Project Period (FY): 2016-04-01 – 2019-03-31
• Keywords: ミューオン / 異常磁気能率 / 素粒子の標準模型 / 強い相互作用

Outline of Final Research Achievements

We have reevaluated the hadronic leading-order contribution to the muon g-2, which has the largest uncertainty in the Standard Model prediction for the muon g-2. Compared to our previous analysis, we have included new input data, have reevaluated the uncertainties associated with radiative corrections to the hadronic data, and have improved the way to combine various hadronic data. Our main conclusion is that there is a 3.7 sigma discrepancy between the experimental value of the muon g-2 and the Standard Model prediction, which may be a hint of new physics beyond the Standard Model.

Free Research Field

素粒子物理学の理論

Academic Significance and Societal Importance of the Research Achievements

素粒子の標準模型を超える新物理が存在するかどうかは素粒子物理学において大きな問題である。我々の得た結果はミューオンの異常磁気能率について標準模型の予言する値と実験値とがあまりよく一致しないことを意味しており、これによって標準模型を超える新物理が存在する可能性はさらに高まったと言える。