Effective field theory for nucleons and light nuclei

核子和轻核的有效场理论

• 批准号: PP/F000448/1
• 负责人: Michael Birse
• 金额: $ 26.34万
• 依托单位: University of Manchester
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2007
• 资助国家: 英国
• 起止时间: 2007 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=PP%2FF000448%2F1
• 关键词: Effective; field; theory; nucleons; light

We plan to study the properties of single nucleons and light nuclei using field theories of nucleons, pions and photons. The 'effective' theories respect the symmetries of the underlying theory of the strong interaction: quantum chromodynamics (QCD). We plan to improve the description of nucleon properties in these theories, and to use them to determine the forces between nucleons in a model-independent way. The results will be applied to the calculations of the interactions of photons with few-nucleon systems. Of particular interest is Compton scattering which provides a very sensitive probe of the internal structure of the nucleon since it can be used to determine the complete set of polarisabilities which describe the repsonse fo a nucleon to an electromagnetic field. In the case of the neutron, our work will help with extracting these polarisabilities from experiments on light nuclei. These theories allow us to write nucleon properties as power series in the mass of the pion, which is a measure of how strongly the chiral symmetry of QCD is broken by the quark masses. Current simulations of QCD on large space-time lattices are carried out using quark masses that are much larger than those in the real world. Our expansions of nucleon properties will be needed to extrapolate the results of these calculations to realistic quark masses.

我们计划用核子、介子和光子的场论来研究单核子和轻核的性质。有效理论尊重强相互作用的基本理论的对称性：量子色动力学(QCD)。我们计划改进这些理论中对核子性质的描述，并使用它们以一种与模型无关的方式确定核子之间的力。这一结果将应用于光子与少核子系统相互作用的计算。特别令人感兴趣的是康普顿散射，它提供了一个非常灵敏的关于核子内部结构的探测器，因为它可以用来确定描述核子对电磁场的共振的一整套极化率。在中子的情况下，我们的工作将有助于从轻核实验中提取这些极化率。这些理论允许我们将核子的性质写成pion质量的幂级数，这是一种测量QCD的手征对称性被夸克质量破坏的程度。目前对大时空格子上的QCD的模拟是使用比现实世界大得多的夸克质量来进行的。我们需要核子性质的展开式来将这些计算的结果外推到实际的夸克质量。

项目成果

Effective field theory of 3 He

3 He有效场论

• DOI: 10.1088/0954-3899/37/10/105108
• 发表时间: 2010
• 期刊: Nuclear and Particle Physics
• 作者: Ando S

Effective Field Theory of 3He

3He有效场论

• DOI: 10.1007/s00601-012-0350-1
• 发表时间: 2012
• 期刊: Few-Body Systems
• 影响因子: 1.6
• 作者: Ando S

Renormalization-group analysis for low-energy scattering of charged particles

带电粒子低能散射的重正化群分析

• DOI: 10.1103/physrevc.78.024004
• 发表时间: 2008
• 期刊: Physical Review C
• 影响因子: 3.1
• 作者: Ando S

The D coefficient in neutron beta decay in effective field theory

有效场论中中子β衰变的D系数

• DOI: 10.1016/j.physletb.2009.04.088
• 发表时间: 2009
• 期刊: Physics Letters B
• 影响因子: 4.4
• 作者: Ando S