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arXiv 0904.3813hep-phhep-exhep-th
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额外维中的Top Yukawa偏差

Top Yukawa Deviation in Extra Dimension

Naoyuki Haba, Kin-ya Oda, Ryo Takahashi

摘要:

我们提出了一个简单的单希格斯双重态模型,该模型存在于在$S^1/Z_2$上紧化的五维时空的大部分中,其中顶部汤川耦合可以小于朴素标准模型的期望值,即顶夸克质量除以希格斯真空期望值。如果我们在大型强子对撞机上只发现单个希格斯粒子,并且还观察到汤川顶偏差,那么我们的方案就成为超越标准模型的现实候选者。Yukawa偏差来自于这样一个事实,即由于膜定域Higgs势的存在,自由物理Higgs场的波函数轮廓可以变得不同于真空期望值。在膜定域费米子的情况下,我们发现相当大的顶部汤川偏差,这可以在大型强子对撞机实验检查,与一个占主导地位的希格斯生产渠道是$WW$融合。我们还研究了体费米子的情况下,膜本地化的希格斯势,这类似于一个稳定的暗物质候选人的通用额外的维度模型。我们表明,这两种情况是一致的,目前的电弱精密测量。

英文摘要:

We suggest a simple one-Higgs-doublet model living in the bulk of five-dimensional spacetime compactified on $S^1/Z_2$, in which the top Yukawa coupling can be smaller than the naive standard-model expectation, i.e. the top quark mass divided by the Higgs vacuum expectation value. If we find only single Higgs particle at the LHC and also observe the top Yukawa deviation, our scenario becomes a realistic candidate beyond the standard model. The Yukawa deviation comes from the fact that the wave function profile of the free physical Higgs field can become different from that of the vacuum expectation value, due to the presence of the brane-localized Higgs potentials. In the Brane-Localized Fermion scenario, we find sizable top Yukawa deviation, which could be checked at the LHC experiment, with a dominant Higgs production channel being the $WW$ fusion. We also study the Bulk Fermion scenario with brane-localized Higgs potential, which resembles the Universal Extra Dimension model with a stable dark matter candidate. We show that both scenarios are consistent with the current electroweak precision measurements.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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