Four generations and Higgs physics
Four generations and Higgs physics
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四代和希格斯物理学
DOI：
10.1103/physrevd.76.075016
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发表时间：
2007
影响因子：
5
通讯作者：
T. Tait
中科院分区：
文献类型：
--
作者：
G. Kribs;T. Plehn;M. Spannowsky;T. Tait
根据大型强子对撞机，我们重新审视第四代手性物质的含义。我们确定了一个特定的粒子质量和混合的集合，这些集合与当前所有的实验范围一致，并最大限度地减少了对电弱精密可观测量的贡献。 68% 和 95% C.L. 的弱电精度数据允许希格斯质量在 115-315 (115-750) GeV 之间。在这个参数空间内，对希格斯现象学产生了巨大的影响：生产率提高，弱玻色子融合通道被抑制，角度分布被修改，并且可以观察到希格斯对。我们还识别出奇异的信号，例如希格斯粒子衰变成同符号双轻子。最后，我们根据真空稳定性和平凡性估计截止尺度的上限。
In the light of the LHC, we revisit the implications of a fourth generation of chiral matter. We identify a specific ensemble of particle masses and mixings that are in agreement with all current experimental bounds as well as minimize the contributions to electroweak precision observables. Higgs masses between 115-315 (115-750) GeV are allowed by electroweak precision data at the 68% and 95% C.L. Within this parameter space, there are dramatic effects on Higgs phenomenology: production rates are enhanced, weak-boson-fusion channels are suppressed, angular distributions are modified, and Higgs pairs can be observed. We also identify exotic signals, such as Higgs decay to same-sign dileptons. Finally, we estimate the upper bound on the cutoff scale from vacuum stability and triviality.