τ强衰变数据单举味破缺求和规则分析中低V_(us)值疑难的一个解决方案（英文）  

A resolution of the puzzle of low V_(us)values from inclusive flavor-breakingsum rule analyses of hadronic τ decay data

作　　者：MALTMAN K. HUDSPITH R.J. LEWIS R. WOLFE C.E. ZANOTTI J. 

机构地区：[1]约克大学 [2]阿德莱德大学物质亚原子结构研究中心

出　　处：《中国科学技术大学学报》2016年第5期374-382,共9页JUSTC

基　　金：Supported by the Natural Sciences and Engineering Research Council of Canada and the Australian Research Council

摘　　要：在应用单举τ强衰变数据由求和规则来确定Vus中,连续和格点方法用于研究系统问题.采用此方法先前常规使用的D>4OPE贡献的假设得到的Vus表明对求和权重w和相关实验谱积分的上限选择s0的非物理依赖.连续的和格点的结果表明这是一个不仅使用|Vus|并且使用D>4有效凝聚的拟合数据的求和规则方法.格点结果也提供了一个对缓慢收敛的D=2OPE序列的缩短不确定性的定量评估.新求和规则的应用得到的|Vus|结果没有非物理的s0和w依赖性并且比常规方法得到的值要高0.002 0.利用初步的新Kπ分支比实验结果得到的|Vus|与基于Kl3的结果高度一致,并且与三代归一性的预测结果相比在误差范围内符合.Continuum and lattice methods are used to investigate systematic issues in the sum rule determination of V_(us)using inclusive hadronicτdecay data.Results for V_(us)employing assumptions for D>4OPE contributions used in previous conventional implementations of this approach are shown to display unphysical dependence on the sum rule weight,w,and choice of upper limit,s0,of the relevant experimental spectral integrals.Continuum and lattice results suggest a new implementation of the sum rule approach with not just|V_(us)|,but also D>4effective condensates fit to data.Lattice results are also shown to provide a quantitative assessment of truncation uncertainties for the slowly converging D =2 OPE series.The new sum rule implementation yields|V_(us)|results free of unphysical s0-and w-dependences and ~0.002 0higher than that obtained using the conventional implementation.With preliminary new experimental results for the Kπbranching fraction,the resulting|V_(us)|is in excellent agreement with that based on Kl3,and compatible within errors with expectations from three-family unitarity.

关 键 词：VUS 格点 求和规则 

分 类 号：O572.324[理学—粒子物理与原子核物理]