CAREER: To the Frontiers of Few-Nucleon Effective Field Theories

职业生涯：少核子有效场论的前沿

• 批准号: 0645498
• 负责人: Harald Griesshammer
• 金额: $ 59.14万
• 依托单位: George Washington University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-03-15 至 2013-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0645498&HistoricalAwards=false
• 关键词: CAREER; Frontiers; Few; Nucleon; Effective

Modern Nuclear Physics rises to the challenge to understand how the complexstructure of hadrons and nuclei at low energies emerges from Quantum ChromoDynamics QCD, the fundamental theory of strong interactions. Effective FieldTheory, the model-independent, systematic description at low energies, haslead to a vibrant interplay between experiment and theory. The goal of this project is a better understanding how the internal structureof nucleons and few-nucleon systems emerges from QCD: The heart of itsapproach are model-independent estimates of its theoretical uncertaintieswhich in turn lead to reliable determinations of nuclear binding effects andfew-nucleon forces. Both encode essential information about QCD. I merge this noveldescription with well-developed but sophisticated numerical techniques toextend it into the realm of light nuclei. Besides the intrinsic interest, Iwill investigate few-nucleon reactions which are hard, if not impossible, to measurebut essential for Astro-Physics (e.g. in big-bang nucleo-synthesis orsupernovae) and for tests of extensions of the Standard Model of ParticlePhysics. Such an approach is in addition vital to compare and understandproton and neutron properties with a minimum of theoretical prejudice. I thereforeprovide model-independent parameterisations and predictions in close contact with avariety of current and upcoming experiments. One focus is to extract thenucleon polarisabilities, and in particular the so-far poorly exploredspin-polarisabilities, which contain essential information on the constituentsand spin-structure of the nucleon. With research and teaching inseparable in higher education, I will trainboth undergraduate and graduate students in communication and teaching skillsin a non-traditional format, enabling them to raise the general standard ofscientific literacy. Students will apply the acquired skills in GW courses forschool teachers and high-school pupils in the DC area, where thesocio-economic and educational indicators are particularly low.

现代核物理学提出了一个挑战，即理解低能强子和原子核的复杂结构是如何从量子色动力学QCD中出现的，QCD是强相互作用的基本理论。有效场理论是一种独立于模型的、系统的低能描述，它在实验和理论之间产生了一种活跃的相互作用。这个项目的目标是更好地理解核子和少核子系统的内部结构是如何从QCD中出现的：其方法的核心是对其理论不确定性的独立于模型的估计，这反过来又导致对核结合效应和少核子力的可靠确定。两者都编码有关QCD的基本信息。我将这一新颖的描述与成熟但复杂的数值技术相结合，将其扩展到轻核领域。除了内在的兴趣，我还将研究少数核子反应，这些反应即使不是不可能，也很难测量，但对于天文物理学(例如，在大爆炸核合成或超新星中)和测试粒子物理标准模型的扩展是必不可少的。此外，这种方法对于以最小的理论偏见比较和理解质子和中子的性质也是至关重要的。因此，我提供了与模型无关的参数和预测，并与当前和即将进行的各种实验密切联系。一个重点是提取核子的极化率，特别是迄今尚未被探索的自旋极化率，其中包含关于核子的组成和自旋结构的基本信息。在高等教育中，研究与教学密不可分，我将以非传统的形式培养本科生和研究生的沟通和教学技能，使他们能够提高科学素养的总体水平。学生将在华盛顿特区的中学教师和高中生的GW课程中应用所获得的技能，这些地区的社会经济和教育指标特别低。