两个希格斯的故事
A tale of two Higgs
摘要：
ATLAS和CMS合作发现了一种新的玻色子，其质量约为125 GeV，性质类似于标准模型Higgs，在ZZ* 到4轻子和双光子通道中都有重要的观察。在这项工作中，我们问是否在这两个通道中的信号可以主要是由于两个不同的共振，每个占主导地位的一个通道。我们调查这个问题的框架中的2 HDM和它的几个扩展。我们保守地发现，这种情况在纯2 HDM中是不可能的，在添加矢量类夸克的情况下也是不可能的，但是在添加一个或两个top-like标量时是允许的，如果允许小于一个tanβ的话。双玻色子和双光子通道中的共振可以是两个标量，或者分别是一个标量和一个赝标量。在每个可行的情况下，我们进一步发现预期的未来偏差的双玻色子，双光子，b \bar b和τ τ率，这将是有用的，在排除两个共振的情况。
英文摘要：
A new boson with mass ~125 GeV and properties similar to the Standard Model Higgs has been discovered by both the ATLAS and CMS collaborations, with significant observation in the ZZ* to 4 leptons and the diphoton channels. In this work we ask whether the signals in these two channels can be due primarily to two distinct resonances, each contributing dominantly to one channel. We investigate this question in the framework of a 2HDM and several of its extensions. We conservatively find that such a scenario is not possible in a pure 2HDM, nor under the addition of vector-like quarks, but is allowed when adding one or two top-like scalars, if one allows for sub-one tanβ. The resonances in the diboson and diphoton channels can then be two scalars, or a scalar and a pseudoscalar, respectively. In each viable case, we further find the expected future deviations in the diboson, diphoton, b \bar b and tau tau rates, which will be useful in excluding the two-resonance scenario.
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