Studying Quantum Chromodynamics at LHCb

在 LHCb 研究量子色动力学

• 批准号: 2012926
• 负责人: Christine Aidala
• 金额: $ 55.52万
• 依托单位: Regents of the University of Michigan - Ann Arbor
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-07-01 至 2023-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2012926&HistoricalAwards=false
• 关键词: Studying; Quantum; Chromodynamics; LHCb

The protons and neutrons in the atomic nuclei of everyday matter are made of subnuclear particles called quarks and gluons. The project supported by this award will study how quarks and gluons scattered out of a proton or produced in high-energy particle collisions subsequently form new bound states. Additional measurements will investigate how strong nuclear charge, called color, flows through proton-proton scattering processes, searching for a theoretically predicted novel state of quarks and gluons that exhibit quantum correlations across colliding protons. Data from the Large Hadron Collider at the European Organization for Nuclear Research (CERN) will be used to perform the research, as part of the Large Hadron Collider Beauty (LHCb) experiment. The research performed will advance our understanding of how strong force bound states such as protons can be created, and the dynamics of their possible interactions. The project supported by this award will furthermore train early career scientists from diverse backgrounds in nuclear physics. Training the next generation of nuclear physicists is critical to maintain expertise relevant to the nation's energy and defense needs and to continue advancing both applied and non-applied research in nuclear physics and technology. Specifically, this award will enable mentored research in nuclear physics on the LHCb experiment by a woman postdoctoral scholar and four Ph.D. students, two women and two men, of which one is Latina American and another African American. In the third year of the award, a student from Mount Holyoke College, an undergraduate institution for women, will have the opportunity to perform summer research in nuclear physics at the University of Michigan.The PI’s group will study how high-energy color-charged quarks hadronize into sprays of observable color-neutral bound states by performing a suite of complementary measurements at LHCb. Specifically, the measurements will compare charged hadron distributions in jets initiated predominantly by light versus heavy quarks; examine evidence for contributions from string breaking versus quark recombination models of hadronization via measurements of baryon versus meson production as a function of event multiplicity; and study spin-momentum correlations in hadronization by measurement of spontaneous polarization of produced hyperons. The proposed hadronization program will contribute toward the ultimate, long-term goal of being able to predict statistically the fully correlated distributions of particles from different flavor high-energy fragmenting quarks. Separate measurements will explore the role of color flow in hadronic scattering processes by searching for experimental evidence of transverse-momentum-dependent factorization breaking and color entanglement. The specific observables include correlated production of nearly back-to-back Z boson-hadron, hadron-hadron, and Z boson-jet pairs. The activities furthermore include contributions to the installation, commissioning, and maintenance of the U.S.-led Upstream Tracker silicon detector upgrade for LHCb.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.

每天的原子核中的质子和中子是由称为夸克和麸质的亚核颗粒制成的。该奖项支持的项目将研究如何从质子中散射出来或在高能粒子碰撞中产生的夸克和麸质如何形成新的结合状态。其他测量结果将调查强核电（称为颜色）如何流过质子蛋白质散射过程，寻找一种理论预测的夸克和麸质的新型状态，这些状态在跨质子质子上表现出量子相关性。欧洲核研究组织（CERN）大型强生对撞机的数据将用于进行研究，作为大型强子对撞机美容（LHCB）实验的一部分。进行的研究将促进我们对如何创建强大束缚状态（例如质子）的理解，以及它们可能相互作用的动态。该奖项支持的项目将进一步培训来自核物理学潜水员背景的早期职业科学家。培训下一代核物理学对于维持与国家能源和国防需求相关的专业知识至关重要，并继续推进核物理和技术领域的应用和非应用研究。具体而言，该奖项将使女性博士后科学和四个博士学位的LHCB实验进行核物理学研究。学生，两个女人和两个男人，其中一个是拉丁美洲人和另一个非裔美国人。在该奖项的第三年中，霍利奥克山学院的一名学生是一家妇女的本科机构，将有机会在密歇根大学进行夏季核物理学研究。PI小组将研究通过对可观察的颜色颜色无界态度的高能色彩夸大的夸克（Quarks）进行，通过对辅助测量仪进行互补测量的态度。具体而言，这些测量结果将比较带有光与重夸克的喷气机中带电的强子分布。通过测量Baryon与Meson生产的测量结果，弦乐与夸克重组模型的贡献的检查证据与事件多样性的关系；并通过测量产生的超子的赞助偏振化测量在结合结合中研究自旋摩孔相关性。拟议的强调计划将有助于能够从不同风味高能碎片夸克的统计上预测粒子的完全相关分布的最终长期目标。单独的测量结果将通过寻找横向摩托明依赖性分解破裂和颜色纠缠的实验证据来探索颜色流在辐射散射过程中的作用。特定的观察值包括几乎背对背Z boson-Hadron，Handron-Hadron和Z Boson-Jet Pairs的相关产生。此外，这些活动还包括对LHCB的美国领导的上游跟踪器硅探测器升级的安装，调试和维护的贡献。该奖项反映了NSF的法定任务，并被认为是通过基金会的知识分子优点和更广泛的影响审查标准通过评估来评估的。

项目成果

Measurement of flavor asymmetry of the light-quark sea in the proton with Drell-Yan dimuon production in p+p and p+d collisions at 120 GeV

利用 120 GeV 的 p p 和 p d 碰撞中的 Drell-Yan 低介子产生来测量质子中轻夸克海的味道不对称性

• DOI: 10.1103/physrevc.108.035202
• 发表时间: 2023
• 期刊: Physical Review C
• 影响因子: 3.1
• 作者: Dove, J.;Kerns, B.;Leung, C.;McClellan, R. E.;Miyasaka, S.;Morton, D. H.;Nagai, K.;Prasad, S.;Sanftl, F.;Scott, M. B.
• 通讯作者: Scott, M. B.

Ntuple Wizard: An Application to Access Large-Scale Open Data from LHCb

Ntuple Wizard：从 LHCb 访问大规模开放数据的应用程序

• DOI: 10.1007/s41781-023-00099-5
• 发表时间: 2023
• 期刊: Computing and Software for Big Science
• 作者: Aidala, Christine A.;Burr, Christopher;Cattaneo, Marco;Fitzgerald, Dillon S.;Morris, Adam;Neubert, Sebastian;Tropmann, Donijor
• 通讯作者: Tropmann, Donijor

The asymmetry of antimatter in the proton

• DOI: 10.1038/s41586-021-03282-z
• 发表时间: 2021-02
• 期刊: Nature
• 影响因子: 64.8
• 作者: J. Dove;B. Kerns;R. McClellan;S. Miyasaka;D. H. Morton;K. Nagai;S. Prasad;F. Sanftl;M. Scott;A. Tadepalli;C. Aidala;J. Arrington;C. Ayuso;C. L. Barker;C. Brown;W. Chang;A. Chen;D. Christian;B. Dannowitz;M. Daugherity;M. Diefenthaler;L. El Fassi;D. Geesaman;R. Gilman;Y. Goto;L. Guo;R. Guo;T. Hague;R. Holt;D. Isenhower;E. Kinney;N. Kitts;A. Klein;D. Kleinjan;Y. Kudo;Ching Him Leung;P. Lin;K. Liu;M. Liu;W. Lorenzon;N. Makins;M. D. de Medeiros;P. McGaughey;Y. Miyachi;I. Mooney;K. Nakahara;K. Nakano;S. Nara;J. Peng;A. Puckett;B. Ramson;P. Reimer;J. Rubin;S. Sawada;T. Sawada;T. Shibata;D. Su;M. Teo;B. Tice;R. Towell;S. Uemura;S. Watson;S. Wang;A. Wickes;J. Wu;Z. Xi;Z. Ye

QCD factorization and quantum mechanics

• DOI: 10.1098/rsta.2021.0058
• 发表时间: 2022-02-07
• 期刊: PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
• 影响因子: 5
• 作者: Aidala, C. A.;Rogers, T. C.
• 通讯作者: Rogers, T. C.