Coulomb artifacts and matching in lattice NRQCD--Institute of Theoretical Physics，Chinese Academy of Sciences

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06/12 2017

Abstract

Institute of Theoretical Physics
Chinese Academy of Sciences
Key Laboratory of Theoretical Physics
Seminar
Title 题目	Coulomb artifacts and matching in lattice NRQCD
Speaker 报告人	刘涛
Affiliation 所在单位	University of Alberta
Date 日期	2017年6月12日（周一）上午10：00
Venue 地点	6420 ITP NEW BUILDING
Abstract 摘要	Like positronium in QED, bottomnium hyperfine splitting is a good place to test QCD. There were progresses made in this direction both on the experimental and theory side. The first theoretical prediction was 41 \pm 14 MeV obtained by B. Kniehl, A. Penin, A. Pineda, V. Smirnov and M. Steinhauser in 2004. Then in 2008 BarBa Collaboration measured the mass of \eta_b for the first time and gave 71^{+3.5}_{-4.1} MeV for HFS, while Belle reported 57.9 \pm 2.3 MeV in 2012. Results evaluated by lattice NRQCD were available from 2012. However, there is a discrepancy between the results obtained by two different groups based on the same lattice data. The physics behind it will be discussed in the talk.
Contact person 所内联系人	杨金民