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arXiv 1602.00949hep-ph
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来自双轴子的双光子

Diphotons from Diaxions

Luis Aparicio, Aleksandr Azatov, Edward Hardy, Andrea Romanino

摘要:

我们研究的模型中,750 GeV的双光子过剩是由于标量衰减到两个伪Nambu-Goldstone玻色子,随后衰减成两对高度增强的光子,被误认为是单独的光子。执行一个模型独立的分析,我们发现,与轴子质量约$200$兆电子伏,这类理论可以很自然地解释所观察到的信号具有较大的宽度,而不违反单喷约束。与此同时,只有在相对较大的轴子-光子耦合下,才能满足瞬发轴子衰变的要求,从而产生许多TeV量级的新带电粒子。然而,所需的多重性,这样的领域仍然适度减少相对于直接双光子生产的模型。

英文摘要:

We study models in which the 750 GeV diphoton excess is due to a scalar decaying to two pseudo-Nambu-Goldstone bosons that subsequently decay into two pairs of highly boosted photons, misidentified as individual photons. Performing a model independent analysis we find that, with axion mass around $200$ MeV, this class of theories can naturally explain the observed signal with a large width, without violating monojet constraints. At the same time the requirement of a prompt axion decay can be satisfied only with a relatively large axion-photon coupling, leading to many new charged particles at the TeV scale. However, the required multiplicities of such fields is still moderately reduced relative to models with direct diphoton production.

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