Complex-mass scheme and effective field theory

复质量格式和有效场理论

• 批准号: 192912456
• 负责人: Professor Dr. Stefan Scherer
• 金额: --
• 依托单位: Institut für Kernphysik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2011
• 资助国家: 德国
• 起止时间: 2010-12-31 至 2011-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/192912456?language=en
• 关键词: Complex; mass; scheme; effective; field

Quantum chromodynamics is the fundamental field theory of the strong interactions with quarks as its matter constituents and gluons as the carriers of the strong force. However, the asymptotically observed states are hadrons which are color-neutral, composite objects made out of quarks and gluons. At low energies, the strong interactions among hadrons may be described in terms of an effective field theory (EFT) using hadron fields instead of quarks and gluons as dynamical degrees of freedom. The corresponding EFT in terms of pions is mesonic chiral perturbation theory. Given a consistent power counting scheme, the EFT may be extended by additional fields such as the nucleon resulting in baryon chiral perturbation theory. In order to take also excited, unstable states into account, we propose the application of the complex-mass scheme (CMS) to the evaluation of physical characteristics of hadron resonances. The chiral limit of the masses and widths of the unstable particles serve as input parameters. With the aid of suitably chosen renormalization conditions, the CMS allows for a perturbative treatment of physical observables of unstable particles.

量子色动力学是以夸克为物质成分、以胶子为强力载体的强相互作用的基础场论。然而，渐进观察到的状态是强子，它们是由夸克和胶子组成的色中性复合物体。在低能量下，强子之间的强相互作用可以用有效场论（EFT）来描述，使用强子场而不是夸克和胶子作为动态自由度。相应的以π介子表示的EFT是介子手征微扰理论。给定一致的功率计数方案，EFT 可以通过核子等附加场进行扩展，从而产生重子手性微扰理论。为了考虑激发态、不稳定态，我们建议应用复质量方案（CMS）来评估强子共振的物理特性。不稳定粒子的质量和宽度的手性极限作为输入参数。借助适当选择的重整化条件，CMS 可以对不稳定粒子的物理可观测值进行微扰处理。

项目成果

Magnetic moment of the Roper resonance

• DOI: 10.1016/j.physletb.2012.07.032
• 发表时间: 2012-08
• 期刊: Physics Letters B
• 影响因子: 4.4
• 作者: T. Bauer;J. Gegelia;S. Scherer

Complex-mass scheme and perturbative unitarity

复质量方案和微扰幺正性

• DOI: 10.1142/s0217751x12501783
• 发表时间: 2012
• 期刊: International Journal of Modern Physics A
• 影响因子: 1.6
• 作者: T. Bauer;J. Gegelia;G. Japaridze;S. Scherer
• 通讯作者: S. Scherer

Complex-mass scheme and resonances in EFT

EFT 中的复质量方案和共振

• DOI: 10.1063/1.3701228
• 发表时间: 2012
• 期刊: arXiv: Nuclear Theory
• 作者: T. Bauer;D. Djukanovic;J. Gegelia;S. Scherer;L. Tiator
• 通讯作者: L. Tiator

Electromagnetic transition form factors of the Roper resonance in effective field theory

• DOI: 10.1103/physrevc.90.015201
• 发表时间: 2014-02
• 期刊: Physical Review C
• 影响因子: 3.1
• 作者: T. Bauer;Lothar Tiator;Stefan Scherer