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arXiv 1908.08554hep-phhep-ex
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SM的双实标量单态扩张:LHC现象学和基准情景

Two-real-scalar-singlet extension of the SM: LHC phenomenology and benchmark scenarios

Tania Robens, Tim Stefaniak, Jonas Wittbrodt

摘要:

我们研究了标准模型标量扇区由两个实标量单态扩展的模型的LHC现象。施加一个$\mathbb{Z}_2\otimes\mathbb{Z}_2'$离散对称性,以减少标量位参数的数量,这是自发破缺的单重态场的真空期望值。结果,所有三个中性标量场混合,导致三个中性CP偶标量玻色子,其中一个与观测到的125 GeV的希格斯玻色子玻色子相同。我们探讨所有相关的碰撞签名的三个标量在这个模型中。除了一个标量玻色子直接衰变到SM粒子末态的单一产生外,我们还广泛地讨论了共振多标量产生的可能性。后者包括产生的标量玻色子衰变为两个相同的标量(“对称衰变”),以及两个不同的标量(“非对称衰变”)。此外,我们讨论了连续衰变到最轻的标量状态(“级联衰变”)的可能性,这导致实验上壮观的三个和四个希格斯最终状态。我们提供了六个基准方案,这些希格斯-希格斯衰变签名的详细实验研究。

英文摘要:

We investigate the LHC phenomenology of a model where the Standard Model (SM) scalar sector is extended by two real scalar singlets. A $\mathbb{Z}_2\otimes\mathbb{Z}_2'$ discrete symmetry is imposed to reduce the number of scalar potential parameters, which is spontaneously broken by the vacuum expectation values of the singlet fields. As a result, all three neutral scalar fields mix, leading to three neutral CP-even scalar bosons, out of which one is identified with the observed Higgs boson at 125 GeV. We explore all relevant collider signatures of the three scalars in this model. Besides the single production of a scalar boson decaying directly to SM particle final states, we extensively discuss the possibility of resonant multi-scalar production. The latter includes decays of the produced scalar boson to two identical scalars ("symmetric decays"), as well as to two different scalars ("asymmetric decays"). Furthermore, we discuss the possibility of successive decays to the lightest scalar states ("cascade decays"), which lead to experimentally spectacular three- and four-Higgs final states. We provide six benchmark scenarios for detailed experimental studies of these Higgs-to-Higgs decay signatures.

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