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arXiv 1311.6629hep-phhep-ex
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作为顶模赝粒子的希格斯粒子

Higgs as a Top-Mode Pseudo

Hidenori S. Fukano, Masafumi Kurachi, Shinya Matsuzaki, Koichi Yamawaki

摘要:

在顶夸克凝聚的精神,我们提出了一个模型,其中有一个自然轻的复合希格斯玻色子,“tHiggs”,被确定为126 GeV的希格斯在大型强子对撞机发现。tHiggs是顶夸克和它的味(类矢量)伙伴的束缚态,作为一个伪Nambu-Goldstone玻色子(NGB)出现,“顶模赝”,与确切的NGB一起被吸收到W和Z玻色子以及另一个(更重的)顶模赝(CP-奇复合标量)。这五个组合通过具有U(3)× U(1)对称性的单个超临界四费米子相互作用同时动态地产生(精确/伪)NGB,该对称性包括电弱对称性,其中真空通过小的显式破缺项对准,以便以不保持电弱对称性的方式将对称性破缺到子群U(2)× U(1 π ′),与小希格斯模型形成鲜明对比。真空排列的显式破缺项产生了tHiggs的质量,它受到对称性的保护,因此自然受到辐射修正的控制。通过引入一个额外的(亚临界)四费米子耦合,它明确地打破了剩余U(2)× U(1)'对称性,类似于顶部跷跷板机制,可以很容易地实现现实的顶夸克质量。我们给出了顶模赝象和标准模型粒子的唯象拉格朗日量,这将有助于对撞机唯象学的研究。的tHiggs的耦合特性被证明是与目前可用的数据报告从大型强子对撞机是一致的。几个现象学的后果和实验的限制也得到了解决。

英文摘要:

In the spirit of the top quark condensation, we propose a model which has a naturally light composite Higgs boson, "tHiggs", to be identified with the 126 GeV Higgs discovered at the LHC. The tHiggs, a bound state of the top quark and its flavor (vector-like) partner, emerges as a pseudo Nambu-Goldstone boson (NGB), "Top-Mode Pseudo", together with the exact NGBs to be absorbed into the W and Z bosons as well as another (heavier) Top-Mode Pseudo (CP-odd composite scalar). Those five composite (exact/pseudo) NGBs are dynamically produced simultaneously by a single supercritical four-fermion interaction having U(3) x U(1) symmetry which includes the electroweak symmetry, where the vacuum is aligned by small explicit breaking term so as to break the symmetry down to a subgroup, U(2) x U(1)', in a way not to retain the electroweak symmetry, in sharp contrast to the little Higgs models. The explicit breaking term for the vacuum alignment gives rise to a mass of the tHiggs, which is protected by the symmetry and hence naturally controlled against radiative corrections. Realistic top quark mass is easily realized similarly to the top-seesaw mechanism by introducing an extra (subcritical) four-fermion coupling which explicitly breaks the residual U(2) x U(1)' symmetry. We present a phenomenological Lagrangian of the Top-Mode Pseudos along with the standard model particles, which will be useful for the study of the collider phenomenology. The coupling property of the tHiggs is shown to be consistent with the currently available data reported from the LHC. Several phenomenological consequences and constraints from experiments are also addressed.

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