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Heavy quark physics with anisotropic lattice QCD

具有各向异性晶格 QCD 的重夸克物理

基本信息

批准号：
16540243
负责人：
ONOGI Tetuya
金额：
$ 2.37万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16540243/
关键词：
anisotropic lattice HQET B meson CKM matrix elements heavy quark 格子QCD ハドロンスペクトルカイラル極限非摂動繰り込み

项目摘要

Precise computation of the B meson weak matrix elements are important for testing the standard model and beyond, but t lattice QCD simulation suffers from discretization error from large b-quark mass. To avoid this problem, two approaches i.e. "anisotropic lattice" and "lattice HQET" are considered to be a promising formulations for heavy quark on the lattice. In this research project, we studied how to formulate "anisotropic lattice" and "lattice HQET". We also studied related phenomenological problems.Matsufuru and Onogi proposed a method to determine the three anisotropic parameters with nonperturbative accuracy. In particular, it was found that meson correlators and PCAC relation in finite volumes can efficiently determine the two of the parameters, i.e. anisotropy of the hopping parameter and the coefficients chromo-electric term. They also studied a method to determine the coefficient of 1/M correction term nonperturbatively. It was found that heavy-light Meson correlators with twisted boundary conditions can precisely determine the kinetic term coefficients of HQET.Onogi also studied the following phenomenological problems.1. Existence of Penta quark states in quenched lattice QCD2. A new method to determined CKM elements |Vub| using B→ pi 1 nu form factors from lattice and B factory data with the help of dispersive bounds.3. Precise determination of B^*B pi coupling using all-to-all propagator method with HQET.Terasaki studied Ds0 bound state which was newly found by Babar and Belle experiments. He proposed a novel interprestation as a four quark state with I=1, which gives a unique prediction about radiative decay. He also considered a possible production mechanism.

B介子弱矩阵元的精确计算对于检验标准模型及更高的模型是非常重要的，但由于b夸克质量较大，使得t格点QCD模拟存在离散化误差。为了避免这个问题，“各向异性格点”和“格点HQET”两种方法被认为是格点上重夸克的一种有前途的表述。在本研究计划中，我们研究如何建立“各向异性晶格”与“晶格HQET”。我们还研究了相关的唯象问题，Matsufuru和Onogi提出了一种确定三个各向异性参数的方法，具有非微扰精度。特别地，我们发现有限体积中的介子介子和PCAC关系可以有效地确定其中的两个参数，即跳跃参数的各向异性和色电项系数.研究了非微扰确定1/M修正项系数的方法。研究发现，在扭曲边界条件下的重-轻介子算符可以精确地确定HQET的动力学项系数.Onogi还研究了以下唯象问题.淬火格点QCD 2中五夸克态的存在性。确定CKM元素的一种新方法|VUB|使用来自晶格和B工厂数据的B→ pi 1 nu形状因子，并借助于色散边界。Terasaki研究了由Babar和贝儿实验发现的Ds 0束缚态，用HQET方法精确测定了B^*B π耦合。他提出了一个新颖的解释，即I=1的四夸克态，这给出了关于辐射衰变的独特预测。他还考虑了一种可能的生产机制。