RUI: Particle theory in the LHC era

“该奖项是根据2009年美国复苏和再投资法案（公法111-5）资助的。尽管它取得了显著的成功，但有强烈的迹象表明，粒子物理学的标准模型是不完整的。在过去的十年里，令人信服的证据表明中微子有质量，宇宙的大部分能量密度被划分为暗能量和暗物质，这改变了我们对自然的基本理解。随着大型强子对撞机计划开始获取数据，未来几年的发展同样令人兴奋。这个实验和其他实验将揭示标准模型遗留下来的一些未解之谜。这份提案详细说明了PI的计划，以调查解决这些谜团的理论思想。特别是，他有兴趣验证是否有证据表明，超对称性将整数自旋粒子与1/2整数自旋粒子统一为超多重态。 特别是，PI建议研究（1）在LHC中使用电荷子级联来约束超伙伴质量的可能性，（2）LHC搜索在额外维度中传播的标准模型场的Randall-Sundrum理论中预测的带电电弱Kaluza-Klein态，以及（3）具有扩展R对称性的超对称理论的现象学。具有扩展R对称性的模型为超对称风味问题提供了一个有趣的解决方案。PI建议研究这些理论的现象学。这将包括探索中微子质量和混合中微子暗物质之间的可能联系，这些理论中预期的重高金诺和软质量中的大味违反的碰撞机签名，以及非弹性中性伴暗物质的可能性。这一提议的更广泛的影响是，本科生参与是PI研究计划的核心部分。学生将有机会从事粒子物理学研究，并通过他们的工作将学习重要的思想，结果和方法，涉及粒子现象学和理论物理学一般。

"This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5)."Despite its remarkable successes, there are strong indications that the standard model of particle physics is incomplete. In the past decade, compelling evidence that neutrinos have mass, and that most of the energy density of the universe is divided between dark energy and dark matter, has altered our understanding of nature at the fundamental level. The coming years promise equally exciting developments, with the LHC scheduled to begin taking data soon. This and other experiments will shed light on some of the profound mysteries left unresolved by the standard model. This proposal details the PI's plan to investigate theoretical ideas for addressing some of these mysteries. In particular he is interested in verifying whether evidence of Supersymmetry which unifies integer spin particles with ½ integer spin particles into super-multiplets will be found at the LHC. In particular the PI proposes to study (1) the possibility of using chargino cascades at the LHC to constrain superpartner masses, (2) LHC searches for the charged electroweak Kaluza-Klein states predicted in Randall-Sundrum theories with standard model fields propagating in the extra dimension, and (3) the phenomenology of supersymmetric theories with extended R symmetry. Models with extended R symmetry provide an interesting solution to the supersymmetric flavor problem. The PI proposes to study the phenomenology of these theories. This will include exploring a possible connection between neutrino mass and mixed-sneutrino dark matter, the collider signatures of the heavy gauginos and large flavor violation in soft masses expected in these theories, and the possibility of inelastic neutralino dark matter. The broader impact of this proposal is that undergraduate involvement is a central part of the PI's research program. Students will have the opportunity to engage in particle physics research, and through their work will learn important ideas, results, and methods relating to both particle phenomenology and theoretical physics in general.