arXiv 1601.075642016-01hep-phhep-ex

超荷轴子与双光子$750$ GeV共振

Hypercharge Axion and the Diphoton $750$ GeV Resonance

Ido Ben-Dayan, Ram Brustein

备注：: 13 pages, 2 figures, V2: minor corrections to numerical estimates of the decay width, total vs. partial width and references added

摘要：

CMS和ATLAS关于$750$ GeV的双光子事件可能过剩的报告是巨大兴奋和希望的原因。我们表明，耦合到超荷的拓扑密度的赝标量轴子，建议在过去的Escherstein和Oaknin作为诱导重子生成的候选人，可以解释在双光子通道中的信号。超荷轴子（HCA）也可以衰变为$Zγ$和$ZZ$。在这些通道中的事件的预期数量太少，无法被检测到，但这种衰变应该在未来被观察到。HCA可以通过载体玻色子融合（VBF）或通过相关产生（AP）产生。后者应该表现为特征衰变到3个光子，这应该很快被观察到。我们适应以前的分析可能检测到的HCA在大型强子对撞机的HCA的Escherstein和Oaknin和Elfgren的情况下，HCA的质量是750 GeV，并找到预期的截面和衰变宽度的HCA耦合。我们发现，预期的横截面符合观察到的过剩事件的数量，并有测量的横截面和报告的部分衰变宽度之间的紧张局势。张力的产生是因为对于VBF和AP，产生横截面和衰减宽度彼此线性相关。因此，我们预计，如果新的共振确实是HCA，其宽度应该明显小于报告的宽度，或者生产横截面应该明显高于报告的。

英文摘要：

The CMS and ATLAS reports on a possible excess of diphoton events at $750$ GeV are the cause of great excitement and hope. We show that a pseudoscalar axion coupled to the topological density of hypercharge, suggested in the past by Brustein and Oaknin as a candidate for inducing baryogenesis, can explain the signal in the diphoton channel. The hypercharge axion (HCA) can also decay to $Zγ$ and $ZZ$. The expected number of events in these channels is too small to have been detected, but such decays should be observed in the future. The HCA can be produced via vector boson fusion (VBF) or via associated production (AP). The latter should be manifested by a characteristic decay to 3 photons which should be observed soon. We adapt the previous analysis of possible detection of the HCA at the LHC by Brustein and Oaknin and by Elfgren to the case that the mass of the HCA is 750 GeV and find the expected cross section and decay width in terms of the HCA coupling. We find that the expected cross-section fits well the observed number of excess events and that there is tension between the measured cross-section and the reported partial decay width. The tension is caused because for both VBF and AP the production cross-section and the decay width depend linearly on each other. We therefore expect that if the new resonance is indeed the HCA, either its width should be significantly smaller than the reported width or the production cross-section should be significantly higher than the reported one.

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