Dear members,

We are pleased to announce two seminars by ** Prof. Yukinari Sumino**.

**Seminar 1**

*** Title**: Understanding Heavy Quark-AntiQuark System by Perturbative QCD

*** Speaker**: Yukinari Sumino (Tohoku University)

*** Date**: 3:00 PM, __May 19__ 2016

*** Place**: CTPU Seminar Room, KAIST Munji Campus

*** Abstract**: Due to the discovery of renormalon cancellation, it became possible to describe the nature of a heavy quark-antiquark system (such as bottomonium) based on perturbative QCD, both qualitatively and quantitatively. Accordingly, interpretaions of the heavy quark mass and interquark force have been modified considerably. I overview what has been understood and some of theoretical progress since then. The UV part of the interquark potential can be computed in perturbative QCD. We show that a "Coulomb+linear" potential is obtained as prediction.

__Seminar 2__

*** Title**: Computation of heavy quarkonium spectrum in perturbative QCD and determination of mc, mb, mt

*** Speaker**: Yukinari Sumino (Tohoku University)

* Date: 3:00 PM, __May 20__ 2016

*** Place**: CTPU Seminar Room, KAIST Munji Campus

*** Abstract**: We computed a full formula of the heavy quarkonium spectrum up to NNNLO in expansion in alpha_s. We present basics as well as some of modern technologies of the computation, with introduction to non-experts. We apply the formula to extract mc, mb (and mt in future) with high precision.

We look forward to your participation in the seminars and lectures.

Thank you.