Japan JSPS Program: Improved Ladder Approximation to the Bethe-Salpeter Equation

9415225该奖项支持日本科学促进会为日本京都大学威斯康星大学物理系安德鲁·博德纳博士提供为期12个月的博士后奖学金。Bordner博士将与物理系的Taichiro Kugo博士合作开展一个研究项目，名为“日本JSPS计划：Bethe-Salpeter方程的改进阶梯近似”。博德纳和库戈将在一个项目上合作，该项目使用了量子色动力学中改进的梯形近似。特别是，该团队将把梯形近似应用于重夸克有效场论的Isgur-Wise函数的预测。在重夸克质量远大于介子中夸克结合能的极限条件下，这个函数是半轻子弱衰变的唯一待定参数。库戈教授发展了梯形近似，博德纳将与他一起进行非常必要的计算，以进一步理解在1/M重夸克展开的下一级出现的两个函数。***

9415225 Bordner This award supports a 12-month Japan Society for the Promotion of Science Postdoctoral Fellowship for Dr. Andrew Bordner, Department of Physics, University of Wisconsin, at the University of Kyoto, Japan. Dr. Bordner will work with Dr. Taichiro Kugo in the Department of Physics, on a research project entitled, "Japan JSPS Program: Improved Ladder Approximation to the Bethe-Salpeter Equation." Bordner and Kugo will collaborate on a project using the improved ladder approximation in quantum chromodynamics. In particular, the team will apply the ladder approximation to the prediction of the Isgur-Wise function of heavy quark effective field theory. This function is the only undetermined parameter for semi-leptonic weak decays in the limit where the heavy quark mass is much larger than the binding energy of the quarks in the meson. Professor Kugo developed the ladder approximation and Bordner will work with him on the much needed calculations to further understand the two functions which arise at the next order in the 1/M heavy quark expansion. ***