High Energy Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.
Department of Physics and Astronomy, Northwestern University, Evanston, Illinois 60208, USA.
Phys Rev Lett. 2018 Dec 28;121(26):261802. doi: 10.1103/PhysRevLett.121.261802.
A large class of models addressing the electroweak naturalness problem postulates the existence of new spontaneously broken global symmetries above the weak scale. The Higgs boson arises as a pseudo-Nambu-Goldstone boson (PNGB) whose interactions are nonlinear due to the presence of degenerate vacua. We argue that, once the normalization of the PNGB decay constant f is determined, the Higgs nonlinear interactions in the gauge sector are universal in the infrared and independent of the symmetry breaking pattern G/H, even after integrating out heavy composite resonances. We propose a set of "universal relations" in Higgs couplings with electroweak gauge bosons and in triple gauge boson couplings, which are unique predictions of the universal nonlinearity. Experimental measurements of these relations would serve as the litmus test of a PNGB Higgs boson.
一大类解决电弱自然性问题的模型假设在弱电尺度之上存在新的自发破缺的全局对称性。希格斯玻色子作为赝标量 Nambu-Goldstone 玻色子（PNGB）出现，其相互作用由于简并真空的存在是非线性的。我们认为，一旦 PNGB 衰变常数 f 的归一化被确定，那么即使在整合重复合共振之后，在红外区规范部分的希格斯非线性相互作用在是普遍的，并且与对称性破缺模式 G/H 无关。我们提出了一组在希格斯玻色子与电弱规范玻色子以及三规范玻色子耦合中的“通用关系”，这是普遍非线性的独特预测。这些关系的实验测量将成为 PNGB 希格斯玻色子的试金石。
