Precision physics of heavy quarks in the LHC era

我们提出了用于在大型强子对撞机实验中精确测量粒子性质的“权函数法”。该方法的优点是：(1)只使用衰变产物中包含的轻子的能量分布，因此对强子化模型和初始态辐射的不确定性依赖较低；(2)理想情况下，该方法不受粒子速度分布的影响，因此部分子分布函数和初始态辐射的不确定性影响较小。我们首先展示了该方法对希格斯粒子质量测定的适用性。目前我们正在研究重建顶夸克质量的方法。我们还开发了计算高阶辐射校正的算法。作为一个应用，我们完成了重夸克谱的次-次-次-次-前阶修正的计算。

We proposed the "weight function method" developed for precise measurements of particle's properties at LHC experiments. The advantages are as follows: (1)Only the energy distribution of a lepton included in the decay products is used, hence dependence on uncertainties of hadronization models and intial-state radiations is low; (2)Ideally the method is independent of particle's velocity distribution, hence effects of uncertainties in parton distribution functions and initial-state radiation are low. We first showed applicability of the method to the Higgs mass determination. Now we are developing method for reconstructing the top quark mass.We also developed algorithms for computing higher-order radiative corrections. As an application, we completed computation of the next-to-next-to-next-to-leading order corrections to the heavy quarkonium spectrum.