RUI: Precision Test of Fundamental Symmetries via Light Pseudoscalar Meson Decays

RUI：通过光赝标量介子衰变精确测试基本对称性

• 批准号: 1812396
• 负责人: Liping Gan
• 金额: $ 26.96万
• 依托单位: University of North Carolina at Wilmington
• 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: 2018-09-01 至 2024-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1812396&HistoricalAwards=false
• 关键词: RUI; Precision; Test; Fundamental; Symmetries

Understanding how quarks are confined to form protons and neutrons and searching for physics beyond the standard model (BSM) are two of the most challenging and exciting frontiers in physics. The major goal of this project is to perform cutting-edge experiments at the Thomas Jefferson National Accelerator Facility (JLab) to explore both fundamental issues through precision tests of fundamental symmetries in the decay of particular subatomic particles, mesons. The results from these experiments have the potential to shed light on critical questions such as: the origin and dynamics of quark confinement, the nature of dark matter, and the mystery of the asymmetry of matter-antimatter in the universe. This project will also offer great opportunities to engage undergraduate students in research. It will create a research-enriched learning environment, explore new approaches to recruiting prospective students, and develop new courses which are research related. Students will work in an international collaboration, which will enhance their international experience and allow them to gain gain global perspectives.The major objectives of this project include: (1) publish the results from the PrimEx-II experiment (E-08-023), a precision measurement of the pi-zero lifetime; (2) prepare and perform the PrimEx-eta experiment to measure the eta radiative decay width (eta decay to two photons) (E-10-011); (3) develop an upgraded FCAL-II calorimeter for the newly approved JEF experiment (E12-12-002A) to study eta and eta-prime decays with emphasis on rare neutral modes in Hall D; and (4) continue the responsibility for maintaining and operating the low-granularity pair spectrometer detectors to control the photon beam in Hall D at JLab. The symmetries of QCD are manifested in their most unambiguous form in the sector of light pseudoscalar mesons pi-zero, eta, and eta-prime. Precision measurements of their properties are crucial to understanding the QCD symmetry structure at low energy, as well as the origin and dynamics of QCD confinement. In addition, the measurements of various rare and forbidden decays of the eta and eta-prime will provide sensitive probes for sub-GeV dark gauge bosons (a leptophobic vector B-prime and an electrophobic scalar meson) and C-violating, P-conserving new forces, which will extend our knowledge of the dark sector and explore new sources of CP violation needed to explain the matter and anti-matter asymmetry in the universe.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.

了解夸克是如何被限制形成质子和中子的，以及寻找超越标准模型(BSM)的物理是物理学中最具挑战性和最令人兴奋的两个前沿。该项目的主要目标是在托马斯·杰斐逊国家加速器设施(JLab)进行尖端实验，通过对特定亚原子粒子、介子衰变过程中基本对称性的精确测试来探索这两个基本问题。这些实验的结果有可能阐明一些关键问题，如：夸克禁闭的起源和动力学，暗物质的性质，以及宇宙中物质-反物质不对称的奥秘。该项目还将为本科生参与研究提供极好的机会。它将创造一个富于研究的学习环境，探索招收潜在学生的新方法，并开发与研究相关的新课程。这个项目的主要目标包括：(1)发表PrimeX-II实验(E-08-023)的结果，这是一个精确测量pi-零寿命的实验；(2)准备和执行PrimeX-ETA实验以测量ETA辐射衰变宽度(ETA衰变到两个光子)(E-10-011)；(3)为新批准的JEF实验(E12-12-002A)开发一台升级的FCAL-II量热计，以研究ETA和ETA素数衰变，重点是D厅的罕见中性模；以及(4)继续负责维护和操作JLab D厅的低粒度对光谱仪探测器，以控制D厅的光子束。QCD的对称性在光伪标量介子pi-Zero、Eta和Eta-Prime的扇区以其最明确的形式表现出来。精确测量它们的性质对于理解低能下的QCD对称结构，以及QCD禁闭的起源和动力学是至关重要的。此外，对ETA和ETA-PRIME的各种罕见和禁止衰变的测量将为亚GeV暗规范玻色子(疏水矢量B-PRIME和电泳性标量介子)和C破坏、P守恒的新作用力提供灵敏的探测器，这将扩展我们对暗部门的知识，并探索解释宇宙中物质和反物质不对称所需的CP破坏的新来源。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势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

Measurement of beam asymmetry for π−Δ++ photoproduction on the proton at Eγ=8.5GeV

Eγ=8.5GeV 质子光生产中光束不对称性的测量

• DOI: 10.1103/physrevc.103.l022201
• 发表时间: 2021
• 期刊: Physical Review C
• 影响因子: 3.1
• 作者: Adhikari, S.;Akondi, C. S.;Ali, A.;Amaryan, M.;Asaturyan, A.;Austregesilo, A.;Baldwin, Z.;Barbosa, F.;Barlow, J.;Barriga, E.
• 通讯作者: Barriga, E.

Electromagnetic calorimeters based on scintillating lead tungstate crystals for experiments at Jefferson Lab

基于闪烁钨酸铅晶体的电磁量热仪，用于杰斐逊实验室的实验

• DOI: 10.1016/j.nima.2021.165683
• 发表时间: 2021
• 期刊: Detectors and Associated Equipment
• 作者: Asaturyan, A.;Barbosa, F.;Berdnikov, V.;Chudakov, E.;Crafts, J.;Egiyan, H.;Gan, L.;Gasparian, A.;Harding, K.;Horn, T.
• 通讯作者: Horn, T.

High precision measurement of Compton scattering in the 5 GeV region

5 GeV 区域康普顿散射的高精度测量

• DOI: 10.1016/j.physletb.2019.134884
• 发表时间: 2019
• 期刊: Physics Letters B
• 影响因子: 4.4
• 作者: Ambrozewicz, P.;Ye, L.;Prok, Y.;Larin, I.;Ahmidouch, A.;Baker, K.;Baturin, V.;Benton, L.;Bernstein, A.;Burkert, V.
• 通讯作者: Burkert, V.

Precision measurement of the neutral pion lifetime

精确测量中性π介子寿命

• DOI: 10.1126/science.aay6641
• 发表时间: 2020
• 期刊: Science
• 影响因子: 56.9
• 作者: Larin, I.;Zhang, Y.;Gasparian, A.;Gan, L.;Miskimen, R.;Khandaker, M.;Dale, D.;Danagoulian, S.;Pasyuk, E.;Gao, H.
• 通讯作者: Gao, H.

The GlueX beamline and detector

• DOI: 10.1016/j.nima.2020.164807
• 发表时间: 2020-05
• 期刊: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
• 作者: S. Adhikari;A. Ali;M. Amaryan;E. Anassontzis;A. Austregesilo;F. Barbosa;J. Barlow;A. Barnes;E. Barriga;R. Barsotti;T. Beattie;J. Benesch;V. Berdnikov;G. Biallas;T. Black;W. Boeglin;P. Brindza;W. Briscoe;T. Britton;J. Brock;W. Brooks;B. Cannon;C. Carlin;D. Carman;T. Carstens;N. Cao;O. Chernyshov;E. Chudakov;S. Cole;O. Cortes;W. Crahen;V. Crede;M. Dalton;T. Daniels;A. Deur;C. Dickover;S. Dobbs;A. Dolgolenko;R. Dotel;M. Dugger;R. Dzhygadlo;A. Dzierba;H. Egiyan;T. Erbora;A. Ernst;P. Eugenio;C. Fanelli;S. Fegan;A. Foda;J. Foote;J. Frye;S. Furletov;L. Gan;A. Gasparian;A. Gerasimov;N. Gevorgyan;C. Gleason;K. Goetzen;A. Goryachev;L. Guo;H. Hakobyan;A. Hamdi;J. Hardin;C. Henschel;G. Huber;C. Hutton;A. Hurley;P. Ioannou;D. Ireland;M. Ito;N. Jarvis;R. Jones;V. Kakoyan;S. Katsaganis;G. Kalicy;M. Kamel;C. Keith;F. Klein;R. Kliemt;D. Kolybaba;C. Kourkoumelis;S. Krueger;S. Kuleshov;I. Larin;D. Lawrence;J. Leckey;D. Lersch;B. Leverington;W. Levine;W. Li;B. Liu;K. Livingston;G. Lolos;V. Lyubovitskij;D. Mack;H. Marukyan;P. Mattione;V. Matveev;M. McCaughan;M. McCracken;W. Mcginley;J. McIntyre;D. Meekins;R. Mendez;C. Meyer;R. Miskimen;R. Mitchell;F. Mokaya;K. Moriya;F. Nerling;L. Ng;H. Ni;A. Ostrovidov;Z. Papandreou;M. Patsyuk;C. Paudel;P. Pauli;R. Pedroni;L. Pentchev;K. Peters;W. Phelps;J. Pierce;E. Pooser;V. Popov;B. Pratt;Y. Qiang;N. Qin;V. Razmyslovich;J. Reinhold;B. Ritchie;J. Ritman;L. Robison;D. Romanov;C. Romero;C. Salgado;N. Sandoval;T. Satogata;A. Schertz;S. Schadmand;A. Schick;R. Schumacher;C. Schwarz;J. Schwiening;A. Semenov;I. Semenova;K. Seth;X. Shen;M. Shepherd;E. Smith;D. Sober;A. Somov;S. Somov;O. Soto;N. Sparks;M. Staib;C. Stanislav;J. Stevens;J. Stewart;I. Strakovsky;B.C.L. Summner;K. Suresh;V. Tarasov;S. Taylor;L. A. Teigrob;A. Teymurazyan;A. Thiel;I. Tolstukhin;A. Tomaradze;A. Toro;A. Tsaris;Y. Haarlem;G. Vasileiadis;I. Vega;G. Visser;G. Voulgaris;N. Walford;D. Werthmüller;T. Whitlatch;N. Wickramaarachchi;M. Williams;E. Wolin;T. Xiao;Y. Yang;J. Zarling;Z. Zhang;Q. Zhou;X. Zhou;B. Zihlmann