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Coulomb artifacts and matching in lattice NRQCD
2017-06-12  【 】【打印】【关闭

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
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