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arXiv 1604.07941hep-phhep-ex
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从750 GeV双光子共振到多轻子超

From the 750 GeV Diphoton Resonance to Multilepton Excesses

Kyu Jung Bae, Chuan-Ren Chen, Koichi Hamaguchi, Ian Low

摘要:

750 GeV双光子共振的弱耦合模型通常会使用携带色电荷和/或电荷的新粒子来介导共振与两个胶子和两个光子的环诱导耦合。新的有色粒子可能不稳定,并且可能衰减到包含标准模型粒子的最终状态。我们考虑一个电弱的矢量夸克(VLQs)携带电荷的5/3和2/3,分别介导的750 GeV共振的环感应耦合的双重。如果VLQ的质量在1 TeV左右,它自然会产生观察到的双光子信号强度,而所有的耦合保持微扰到一个高的尺度。同时,如果电荷-5/3 VLQ衰变到包含顶夸克和W玻色子的末态,它将有助于在运行1和运行2数据中观察到的多轻子过剩。也有可能在衰变终态中加入一种暗物质候选物来解释观测到的遗迹密度。

英文摘要:

Weakly-coupled models for the 750 GeV diphoton resonance often invoke new particles carrying both color and/or electric charges to mediate loop-induced couplings of the resonance to two gluons and two photons. The new colored particles may not be stable and could decay into final states containing standard model particles. We consider an electroweak doublet of vector-like quarks (VLQs) carrying electric charges of 5/3 and 2/3, respectively, which mediate the loop-induced couplings of the 750 GeV resonance. If the VLQ has a mass at around 1 TeV, it naturally gives rise to the observed diphoton signal strength while all couplings remain perturbative up to a high scale. At the same time, if the charge-5/3 VLQ decays into final states containing top quark and W boson, it would contribute to the multilepton excesses observed in both Run 1 and Run 2 data. It is also possible to incorporate a dark matter candidate in the decay final states to explain the observed relic density.

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