Top quark mass and Yukawa coupling determinations at ILC

2017 Fiscal Year Final Research Report

• Project/Area Number: 26400255
• 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: Juntendo University
• Principal Investigator: Kiyo Yuichiro 順天堂大学, 医学部, 准教授 (60571338)
• Project Period (FY): 2014-04-01 – 2018-03-31
• Keywords: QCD / トップ・クォーク質量 / ILC / トップ・クォーク湯川結合定数 / 非相対論的QCD / 有効理論 / クォーコニウム

Outline of Final Research Achievements

We computed top quark threshold cross section near 340GeV beam energy at future ILC aiming precision top mass and Yukawa coupling measurements. We made a C++ computer program, qqbar_threshold, which computes the threshld cross section in the framework of non-relativistic QCD. The code includes NNNLO QCD corrections as well as dominant electroweak corrections so that reliable theory prediction is available for phenomenology analysis.
We investigated limit of theoretical error on the top mass determination in threshold scan, and showed the accuracy is about 30 MeV. We studied the sensitivity of the threshold cross section on top quark width, Yukawa coupling and othere parameters.

Free Research Field

QCD有効理論、トップ・クォーク質量