题 目：Novel method for the precise determination of the QCD running couplingfrom event shapes

报告人：王声权 教授（贵州民族大学）

时 间：2024年10月17日 星期四上午10:00

地 点：理工楼1226

联系人：刘翔

报告摘要：

The strong coupling constant, α_s(Q²), is the fundamental coupling underlying QCD and its predictions for hadron and nuclear physics. It is thus crucial to determine α_s(Q²) to the best possible precision. The dependence of α_s(Q²) on the renormalization scale Q² obtained from many different physical processes show consistency with QCD predictions and asymptotic freedom. We present a novel method for precisely determining the running QCD coupling constant α_s(Q²) over a wide range of Q² from event shapes for electron-positron annihilation measured at a single annihilation energy√s . The determination of the renormalization scale for event shapes is obtained by using the principle of maximum conformality. We obtain α_s(M_Z)=0.1185±0.0012 from the thrust, and α_s(M_Z)=0.1193±0.0020 from the C-parameter. These determinations of α_s(M_Z) are consistent with the world average and are more precise than the values obtained from analyses of event shapes currently used in the world average.

个人简介：

王声权，主要从事粒子物理中Higgs粒子、顶夸克和QCD耦合常数的研究。美国斯坦福大学访问学者，贵州民族大学物理与机电工程学院副院长，贵州省物理学会副理事长。主持国家自然科学基金项目4项。在JHEP，Phys.Rev.D，Eur.Phys.J.C等主流物理期刊上发表论文40余篇。物理综述ROPP期刊1篇，PPNP期刊2篇。关于QCD耦合常数的研究工作得到国际粒子物理数据组（PDG）和欧洲实验组LHeC和FCC的引用。曾获贵州省青年科技奖、贵州省优秀青年科技人才，贵州省青年五四奖章，贵州省优秀科技个人奖、贵州省“创新争先·科技榜样”，新时代的贵州人、贵州省自然科学奖三等奖（独立获奖）。