pNGB希格斯粒子的美丽镜子
Beautiful mirrors for a pNGB Higgs
摘要：
我们考虑了与标准模型最显著的偏差之一：在轻子对撞机上测得的b夸克的前后不对称性。我们研究的可能性，以解决这个矛盾，通过引入新的物理在TeV尺度。我们关注的模型中，希格斯玻色子是一个新的强耦合部门的一个伪南武-戈德斯通玻色子的全球SO（5）对称性自发破缺SO（4）。除了通常的顶部伙伴，我们引入底部伙伴在SO（5）的表示16和4，并表明，他们可以通过校正Zbb耦合显着改善拟合。我们还估计了单圈耦合的修正，得到了树级耦合的修正占主导地位，可以给出一个可靠的估计。我们发现Zb_Rb_R所需的大位移导致了与b夸克相关的轻监护人，类似于顶部伙伴，以及涉及底部扇区中性相互作用的丰富现象学。
英文摘要：
We consider one of the most significant deviations from the Standard Model: the forward-backward asymmetry of the b-quark measured at leptonic colliders. We investigate the possibility to solve this discrepancy by introducing new physics at the TeV scale. We focus on models where the Higgs is a pseudo Nambu-Goldstone boson of a new strongly coupled sector with a global SO(5) symmetry broken spontaneously to SO(4). Besides the usual top partners, we introduce bottom partners in the representations 16 and 4 of SO(5) and show that they can improve significantly the fit by correcting the Zbb couplings. We also estimate the corrections to the couplings at one-loop and obtain that the tree-level ones dominate and can give a reliable estimation. We find that the large shift required for Zb_Rb_R leads to light custodians associated to the b-quark, similar to the top partners, as well as a rich phenomenology involving neutral interactions in the bottom-sector.
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