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Testing Physics Beyond the Standard Model at Linear Colliders

在线性对撞机上测试超出标准模型的物理特性

基本信息

批准号：
08640343
负责人：
HIKASA Ken-ichi
金额：
$ 1.41万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

项目摘要

1.We study three-body decays of charginos in supersymmetry and examine the dependence of the branching ratios on the mass of scalar quarks and leptons. We find that the ratio of electronic and tauonic branching ratio can have a large deviation from one if the chargino is gaugino-like. This measurement should be useful to obtain information on slepton masses and therefore a key to the mechanism of supersymmetry breaking.2.In the gauge mediated scenario of supersymmetry breaking, superparticles eventually decay to a gravitino, which has a spin 3/2. We develop a formalism to calculate helicity amplitudes for processes containing spin 3/2 particles. Some decay processes with a gravitino in the initial or final state are calculated.3.We develop a compute code which generates programs to calculate cross sections for superparticle production processes (with two or three body final states) in e^+e^- collisions.4.We study the effect of final state interaction due to gluon exchange on the energy and angular distributions of final leptons in top production in e^+e^- collisions. The distributions change by ten percent due to this effect. We also calculate the second order correction to the QCD potential which is related to the top production process. We find that the result changes according to whether the renormalization group equation is solved in the momentum or the configuration space. This ambiguity gives a 6% error to the cross section.5.We apply the N/D method developed for the strongly interacting Higgs sector to pipi scattering and find a result suggestive of the existence of the sigma meson.

1.研究了超对称电荷态的三体衰变，考察了分支比与标量夸克和轻子质量的关系。我们发现，电子和Tauonic分支比的比例可以有一个很大的偏差，如果chargino是gaugino类。这种测量对于获得关于slepton质量的信息是有用的，因此是研究超对称性破缺机制的关键。2.在规范介导的超对称性破缺情形中，超粒子最终衰变为自旋为3/2的引力子。我们发展了一种计算包含自旋3/2粒子的过程的螺旋度振幅的形式。3.编制了计算e^+e^-碰撞中超粒子产生过程（两体末态和三体末态）截面的程序; 4.研究了胶子交换末态相互作用对e ^+ e ^-碰撞top产生末态轻子的能量和角分布的影响。由于这种影响，分布变化了10%。我们还计算了与top产生过程有关的QCD势的二阶修正。我们发现，根据重整化群方程是在动量空间还是位形空间中求解，结果会发生变化。这种不确定性使截面的计算误差达到6%。5.我们将强相互作用Higgs扇区的N/D方法应用于pipi散射，得到了σ介子存在的一个结果。