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首页> 外文期刊>International Journal of Modern Physics, A. Particles and Fields, Gravitation, Cosmology >Subdominant left-right scalar dark matter as origin of the 750 GeV di-photon excess at LHC
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Subdominant left-right scalar dark matter as origin of the 750 GeV di-photon excess at LHC

机译：LHC 750 GeV双光子过量的主要左右标量暗物质

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摘要

We study the possibility of explaining the recently reported 750 GeV di-photon excess at LHC within the framework of a left-right symmetric model. The 750 GeV neutral scalar in the model is dominantly an admixture of neutral components of scalar bidoublets with a tiny fraction of neutral scalar triplet. Incorporating SU(2) septuplet scalar pairs into the model, we enhance the partial decay width of the 750 GeV neutral scalar into di-photons through charged septuplet components in loop while keeping the neutral septuplet components as subdominant dark matter candidates. The model also predicts the decay width of the 750 GeV scalar to be around 36 GeV to be either confirmed or ruled out by future LHC data. The requirement of producing the correct di-photon signal automatically keeps the septuplet dark matter abundance subdominant in agreement with bounds from direct and indirect detection experiments. We then briefly discuss different possibilities to account for the remaining dark matter component of the Universe in terms of other particle candidates whose stability arises either due to remnant discrete symmetry after spontaneous breaking of U (1)(B-L) or due to high SU(2)-dimension forbidding their decay into lighter particles.
机译：我们研究了在左右对称模型的框架内解释LHC最近报道的750 GeV双光子过量的可能性。该模型中的750 GeV中性标量主要是标量双峰的中性成分与一小部分中性标量三重态的混合物。将SU（2）七维标量对纳入模型，我们通过循环中的带电七维组分增强750 GeV中性标量到双光子的部分衰减宽度，同时保持中性七维组分作为主要的暗物质候选物。该模型还预测750 GeV标量的衰减宽度约为36 GeV，可以通过未来的LHC数据加以确认或排除。产生正确的双光子信号的要求自动使七肽的暗物质丰度保持在与直接和间接检测实验的界限一致的水平。然后，我们根据其他候选粒子简要讨论了解决宇宙剩余暗物质成分的不同可能性，这些候选粒子的稳定性是由于U（1）（BL）自发破裂后残留的离散对称性或高SU（2）而产生的）维度，禁止其衰减为更轻的粒子。

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