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TeV 能标下的新物理现象学

TeV 能标下的新物理现象学. 周雅瑾. Know/handle Theories: Choose theory from Theorist. Calculate, simulate and predict new signal @ Collider. Know Experiments: 1) tell experimentalists what to expect 2) explain “odd” observations (in your favor theory) 3) test your favorite yourself, 100%, excellent!.

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TeV 能标下的新物理现象学

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  1. TeV能标下的新物理现象学 周雅瑾

  2. Know/handle Theories: Choose theory from Theorist. Calculate, simulate and predict new signal @ Collider Know Experiments: 1) tell experimentalists what to expect 2) explain “odd” observations (in your favor theory) 3) test your favorite yourself, 100%, excellent! Who is working on Particle Physics: Theorist Experimentalist declares World should be purely “this way” … but won’t be bothered to prove busy with Collider/Detector to discover “truth” but … quite often no idea where and how to look for breakthroughs Phenomenologist = Theorist(>50%) + Experimentalist(~80%)

  3. 简介 • 标准模型及其外的新物理，包括：额外维模型，小Higgs模型，最小超对称模型，电弱和QCD修正 • 强子的自旋结构

  4. 大型强子对撞机(LHC) 国际直线对撞机(ILC) 更高能量的对撞机 标准模型（standard model, SM） • SM成就：统一了电磁、弱、强三种相互作用 • 迄今为止的电弱实验测量都与标准模型的理论预言精确吻合 • 1983年发现W和Z粒子(CERN),1995年发现top夸克(TEVATRON) • SM缺点: • Higgs机制所预言的一个中性Higgs粒子，实验还没有发现 • 等级差问题：即电弱能标(100GeV)和普朗克能标(1019GeV)之间的巨大差异，或者说Higgs粒子质量修正的平方发散问题 • Beyond Standard Model(BSM): • 超对称模型 • 额外维模型 • 小Higgs模型 • ……

  5. 超对称模型 引入动机：解决圈积分对标量粒子质量重整化常数贡献的平方发散问题，即等级差问题(hierarchy problem) 解决办法：使费米子和玻色子的圈贡献拥有相反的符号 引入方法：在原来的时空坐标中加入一些新的坐标qa MSSM :只引入一套qa的情形，标准模型的最小超对称扩充。 同样是基于SUC(3)SUL(2) UY(1) 的规范理论

  6. cancellations bosons fermions SUSY : Little Higgs : new gauge bosons gauge bosons quarks new quarks 小Higgs模型 引入动机：解决圈积分对标量粒子质量重整化常数贡献的平方发散问题，即等级差问题(hierarchy problem) 解决办法： Littlest Higgs Model(LH) :参数受电弱精确测量的强烈限制 Littlest Higgs Model with T-parity (LHT): mirror particles

  7. 额外维模型 D=n+4 n维紧致化半径为R的圆环面 体积Vn=(2pR)n 4维时空 （t,x,y,z） 引力势： 假设R足够大使得MS~MW，则只剩一个能标 MS~1TeV与弱作用能标一致，等级差问题解决 Kaluza和Klein关于时空维数可以大于4的想法复活

  8. TeV对撞机 • LHC mh: 145~466 excluded • 14 TeV质子对撞机 • 优点：能量高，亮度高 • 缺点：很大的强子本底 • discovery machine

  9. ILC • 筹建中的国际直线对撞机 • phase I：200-500GeVphase II： ～ 1 TeV • 正负电子对撞，可光子对撞 • 优点：精度好，背景干净，质心系能量可调，轫致辐射低，束流可极化 • 缺点：提高能量成本很高 • discovery and precision measurement machine

  10. What we do SM, BSM(超对称模型,额外维模型,小Higgs模型) Know/handle Theories: Choose theory from Theorist. Calculate, simulate and predict new signal @ Collider 截面，角分布，横动量分布，信噪比，等等 LHC, ILC

  11. What I have done • 标准模型下的电弱辐射修正 • e+e-→ ZZH • 最小超对称模型下的单圈计算 • g g→ Higgs pair in the MSSM • 大额外维模型下引力子的直接和间接测量 • e+e-→ ZZH and ZHH in the LED Model • pp → in the LED Model at LHC • gg→e+e-G in the LED Model at ILC

  12. What I am doing • some FCNC processes in the Littlest Higgs model with T-parity

  13. 明年工作计划 • 强子的自旋结构 • 额外维模型中一些重要过程的QCD修正 谢谢！

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