论文标题
新物理学以$wwγ$在一个循环中通过Majoraana Neutminos
New physics in $WWγ$ at one loop via Majorana neutrinos
论文作者
论文摘要
当前的实验数据保证了中微子部门中标准模型以外的物理学的存在。负责任的物理描述可能会通过对低能观测值的虚拟影响来表现出来。特别是，大量中微子能够为$wwγ$的三量规耦合产生贡献。本文介绍了从主要中微子对Lorentz-Covariant $WWγ$参数化的一环贡献的计算，估计和分析。我们的计算表明，CP-ODD效果准确消失，而CP-E-E贡献（$Δκ$和$ΔQ$）仍然存在。根据我们的估计，重型中微子的质量在数百个GEV范围内占主导地位的中微子的影响。这项调查表明，重型主要中微子对异常$Δκ$的贡献可能高达$ \ sim {\ cal o}（10^{ - 3}）$，比标准模型贡献低一个数量级。我们发现，对参与$ WW $生产的三重计耦合敏感的国际线性碰撞器可能会在电子峰值碰撞中衡量这些效果，而在$ 800 \，{\ rm gev} $的质量中心碰撞中，只要是$ \ gtrsim300 \ g， $ \ sim1500 \，{\ rm gev} $。
Current experimental data guarantees the presence of physics beyond the Standard Model in the neutrino sector. The responsible physical description might show itself through virtual effects on low-energy observables. In particular, massive neutrinos are able to produce contributions to the triple gauge coupling $WWγ$. The present paper deals with the calculation, estimation and analysis of one-loop contributions from Majorana neutrinos to the Lorentz-covariant $WWγ$ parametrization. Our calculations show that CP-odd effects vanish exactly, whereas CP-even contributions, $Δκ$ and $ΔQ$, remain. According to our estimations, the effects from heavy neutrinos with masses in the range of hundreds of GeVs dominate over those from light neutrinos. This investigation shows that contributions from heavy Majorana neutrinos to the anomaly $Δκ$ could be as large as $\sim{\cal O}(10^{-3})$, one order of magnitude below the Standard-Model contribution. We find that the International Linear Collider, sensitive to triple gauge couplings participating in $WW$ production, might measure these effects in electron-positron collisions at a center-of-mass energy of $800\,{\rm GeV}$, as long as heavy-neutrino masses are $\gtrsim300\,{\rm GeV}$ and below $\sim1500\,{\rm GeV}$.
