AdS/QCD holographic light-front wavefunction, diffractive vector meson production and B physics

AdS/QCD 全息光前波函数、衍射矢量介子产生和 B 物理

• 批准号: SAPIN-2017-00033
• 负责人: Ahmady, Mohammad
• 金额: $ 1.46万
• 依托单位: Mount Allison University
• 依托单位国家: 加拿大
• 项目类别: Subatomic Physics Envelope - Individual
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=617904
• 关键词: AdS; QCD; holographic; light; front

The discovery of Higgs boson by LHC in 2012 was an important step in validating the Standard Model (SM). However, there are already tensions between certain data and theoretical calculations based on SM. To make definite conclusions from these tensions, we need to improve the accuracy of both the measurement data and theoretical calculations. With the increase in luminosity and energy LHCb Run II (2015-19) expects to, at least, quadruple its effective statistics with the data collected until 2019 and hence half the uncertainties on the current measurements. In addition, SuperKEKB, which is an upgrade project of KEKB (1998-2010) at KEK (Japan) is designed to increase the instantaneous luminosity by about a factor of 40. Along with the BELLE II detector, this next-generation B-factory will complement the exploration of New Physics beyond the Standard Model currently being carried out at the energy frontier by LHC. The physics run of SuperKEKB will start in 2017. The numerous decay channels of the B mesons (quark-antiquark bound state containing a b-quark) to light mesons (quark-antiquark bound state with no b-quark) offer the opportunity to make precision tests of the Standard Model and perhaps more interestingly, to look for signals of physics beyond the SM. Exclusive B decays to light mesons are appealing since they are relatively easy to access experimentally, especially in an environment like the LHC. On the other hand, the theory of such decays is challenging due to the strong interactions effects. The theory of strong interactions, which is called quantum chromodynamics (QCD), becomes complicated when dealing with bound-state quantities. The computation of these quantities is challenging and model-dependent. Therefore, it is very important to make SM predictions using alternative viable approaches to nonperturbative QCD.

2012年LHC发现希格斯玻色子是验证标准模型（SM）的重要一步。然而，某些数据和基于SM的理论计算之间已经存在紧张关系。为了从这些张力中得出明确的结论，我们需要提高测量数据和理论计算的准确性。随着亮度和能量的增加，LHCb运行II（2015-19）预计到2019年收集的数据至少会使其有效统计数据翻两番，因此目前测量的不确定性会减少一半。此外，SuperKEKB是KEK（日本）KEKB（1998-2010）的升级项目，旨在将瞬时光度提高约40倍。沿着贝儿II探测器，这个下一代B工厂将补充LHC目前在能源前沿进行的超越标准模型的新物理学探索。SuperKEKB的物理运行将于2017年开始。从B介子（含有一个b夸克的夸克-反夸克束缚态）到轻介子（不含b夸克的夸克-反夸克束缚态）的众多衰变通道，提供了对标准模型进行精确检验的机会，也许更有趣的是，可以寻找SM之外的物理信号。只有B衰变为轻介子是很有吸引力的，因为它们相对容易在实验中获得，特别是在像LHC这样的环境中。另一方面，由于强相互作用效应，这种衰变的理论是具有挑战性的。被称为量子色动力学（QCD）的强相互作用理论在处理束缚态量时变得复杂。这些量的计算具有挑战性并且依赖于模型。因此，用其他可行的方法对非微扰QCD进行SM预言是非常重要的。