arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节（Veterans Day），12 日无更新
arXiv 1602.04170hep-ph
收藏

普朗克尺度下的LHC双光子超数模型

Models of LHC Diphoton Excesses Valid up to the Planck scale

Yuta Hamada, Hikaru Kawai, Kiyoharu Kawana, Koji Tsumura

备注：
35 pages, 4 figures; the maximum values of $σ_{γγ}$ for the scalar extensions are recalculated, typos corrected, references added (v2); references added, typos corrected, version to appear in PRD (v3)
发表信息：
Phys. Rev. D 94, 014007 (2016)
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

摘要：

讨论了用新标量$X$通过新的带标准模型电荷的大质量粒子环耦合到规范玻色子来解释$750$ GeV的LHC双光子过剩的可能性。我们假设新粒子在树的层次上衰变为标准模型粒子。我们系统地研究模型，保持真空稳定性和微扰普朗克尺度。当我们对新粒子取标量时，我们发现只有少数双夸克和双轻子模型能解释观测到的双光子截面而不与实验质量边界相冲突。当我们把类矢量的费米子作为新粒子时，我们发现它们与$X$的耦合是标量型还是赝标量型的不同情况。在前一种情况下，如果我们只引入一种费米子，则允许有几种模型。我们引入的费米子越多，允许的模型就越多。在后一种情况下，由于$X$和光子之间的耦合很大，所以大多数模型都是允许的。有趣的是，下一代轻子对撞机可能会达到标量粒子的允许质量区域。

英文摘要：

We discuss a possibility to explain the LHC diphoton excesses at $750$GeV by the new scalar $X$ that couples to the gauge bosons through the loop of new massive particles with Standard Model charges. We assume that the new particles decay into the Standard Model particles at the tree level. We systematically examine the models that preserve the vacuum stability and the perturbativity up to the Planck scale. When we take scalars for the new particles, we find that only a few diquark and dilepton models can explain the observed diphoton cross section without conflicting the experimental mass bounds. When we take vector-like fermions for the new particles, we find rather different situations depending on whether their couplings to $X$ are scalar or pseudoscalar type. In the former case, a few models are allowed if we introduce only one species of fermions. The more fermions we introduce, the more models are allowed. In the later case, the most of the models are allowed because of the large coupling between $X$ and photon. It is interesting that the allowed mass regions of the scalar particles might be reached by the next lepton colliders.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

↑