Research in Theoretical Hadronic Physics and Related Topics

理论强子物理及相关课题研究

• 批准号: 1812326
• 负责人: Jeffrey Nelson
• 金额: $ 22.5万
• 依托单位: College of William and Mary
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-08-01 至 2024-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1812326&HistoricalAwards=false
• 关键词: Research; Theoretical; Hadronic; Physics; Related

Nuclear Physics is the field of physics that studies the atomic nucleus constituents (protons and neutrons) and the interactions that hold them together. In this context, this project will investigate a number of fundamental topics of interest in nuclear theory. Specifically, the project will focus on providing a better understanding of the proton structure. One of the outstanding problems is the proton charge radius puzzle, triggered by the fact that measurements using electrons and muons give rise to different values of the proton charge radius. Seeking a resolution to this puzzle, the PI and his collaborators will calculate crucial corrections needed to understand experiments performed at the Thomas Jefferson National Accelerator Facility (JLab) (USA) and experiments proposed at JParc (Japan). The PI will involve undergraduate students in these projects, and continue fostering research connections between universities and national labs (especially W&M and JLab).This project will study nuclear structure-dependent corrections to the Lamb shift in muonic He-4, supporting the extension to He-4 of the muonic hydrogen Lamb shift measurements which led to the proton radius puzzle. This project will also study models for light mass muon specific new particles, seeking a model that would encompass the constraints on such particles, pursuing first models inspired by suggestions of Froggatt and Nielsen. Regarding pion form factors, they are measured in the reaction e+ p - e pi n, with an extrapolation to the pion pole, and a background from non-pole terms that must be modeled. Given that the related pi + p - (lepton pair) + n process is anticipated at JParc, the PI and his collaborators will make numerically clear the relevant backgrounds. The PI will also study twisted photons, which have structured wave fronts that allow high angular momentum (many h-bar) in the direction of motion, and which can be produced at hadron scale energies.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

核物理学是研究原子核成分（质子和中子）以及将它们结合在一起的相互作用的物理学领域。在这种情况下，这个项目将调查一些对核理论感兴趣的基本主题。具体来说，该项目将侧重于更好地了解质子的结构。其中一个突出的问题是质子电荷半径难题，这是由于使用电子和μ子测量质子电荷半径会产生不同的值而引发的。为了解决这个难题，PI和他的合作者将计算关键的修正，以理解在托马斯杰斐逊国家加速器设施（JLab）（美国）进行的实验和在JParc（日本）提出的实验。PI将让本科生参与这些项目，并继续促进大学和国家实验室（特别是W&amp；M和JLab）之间的研究联系。该项目将研究介子氦-4中兰姆位移的核结构相关修正，支持将导致质子半径谜题的介子氢兰姆位移测量扩展到氦-4。该项目还将研究轻质量μ子特定新粒子的模型，寻求一个包含此类粒子约束的模型，寻求受Froggatt和Nielsen建议启发的第一个模型。关于介子形状因子，它们是在反应e+ p - e π n中测量的，对介子极进行外推，并从必须建模的非极项中获得背景。考虑到相关的π + p -（轻子对）+ n过程预计将在JParc进行，pi和他的合作者将在数字上明确相关背景。PI还将研究扭曲光子，扭曲光子具有结构波阵面，在运动方向上允许高角动量（许多h-bar），并且可以在强子尺度能量下产生。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Excitation of E1-forbidden atomic transitions with electric, magnetic, or mixed multipolarity in light fields carrying orbital and spin angular momentum [Invited]

在携带轨道和自旋角动量的光场中以电、磁或混合多极性激发 E1 禁止原子跃迁 [邀请]

• DOI: 10.1364/josab.36.000565
• 发表时间: 2019
• 期刊: Journal of the Optical Society of America B
• 作者: Solyanik-Gorgone, Maria;Afanasev, Andrei;Carlson, Carl E.;Schmiegelow, Christian T.;Schmidt-Kaler, Ferdinand
• 通讯作者: Schmidt-Kaler, Ferdinand

Dilepton photoproduction on a deuteron target

氘核靶上的双轻子照片制作

• DOI: 10.1016/j.physletb.2019.134872
• 发表时间: 2019
• 期刊: Physics Letters B
• 影响因子: 4.4
• 作者: Carlson, Carl E.;Pauk, Vladyslav;Vanderhaeghen, Marc
• 通讯作者: Vanderhaeghen, Marc

Experimental verification of position-dependent angular-momentum selection rules for absorption of twisted light by a bound electron

• DOI: 10.1088/1367-2630/aaa63d
• 发表时间: 2018-02-09
• 期刊: NEW JOURNAL OF PHYSICS
• 影响因子: 3.3
• 作者: Afanasev, Andrei;Carlson, Carl E.;Solyanik, Maria
• 通讯作者: Solyanik, Maria

Superkicks and the photon angular and linear momentum density

超级踢和光子角动量密度和线动量密度

• DOI: 10.1103/physreva.105.l061503
• 发表时间: 2022
• 期刊: Physical Review A
• 影响因子: 2.9
• 作者: Afanasev, Andrei;Carlson, Carl E.;Mukherjee, Asmita
• 通讯作者: Mukherjee, Asmita

Atomic spectroscopy with twisted photons: Separation of M1−E2 mixed multipoles

• DOI: 10.1103/physreva.97.023422
• 发表时间: 2018-01
• 期刊: Physical Review A
• 影响因子: 2.9
• 作者: A. Afanasev;C. Carlson;M. Solyanik