arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新，休息一下吧，周末愉快~~
arXiv 1710.03377hep-phhep-ex
收藏

在LHC上增强的重Majorana中微子对产生

Enhanced pair production of heavy Majorana neutrinos at LHC

Arindam Das, Nobuchika Okada, Digesh Raut

备注：
10 pages, 2 figures, revised version (discussion extended, Figure 1 revised, typos corrected, new references added)
发表信息：
Phys. Rev. D 97, 115023 (2018)
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

摘要：

为了验证I型跷跷板机制，我们探索了在未来的LHC上通过共振产生一个新的大质量规范玻色子（$Z^{\prime}$）及其随后衰变成一对右手中微子（$Z^{\prime}\to NN$）来发现重Majorana右手中微子（RHN）的前景.最近的模拟研究表明，通过这一过程发现的RHN是有希望的。然而，目前的大型强子对撞机数据非常严格地限制了$Z^{\prime}$玻色子的产生截面为双轻子终态，$pp \to Z^{\prime}\to \ell^{+}\ell^{-} $（$\ell=e$或$μ$）。外推到未来的电流约束，我们发现，一个显着的分支比${\rm BR}(Z^{\prime}\to NN$）比${\rm BR}(Z^{\prime}\to \ell^{+}\ell^{-}$）的增强是必要的，为未来发现的RHN。作为标准模型（SM）的一个很好的动机简单的扩展，将$Z^\prime$玻色子和I型跷跷板机制，我们考虑最小U（1）$_X$模型。我们指出，该模型可以产生一个显着的增强高达${\rm BR}(Z^{\prime}\to NN)/{\rm BR}(Z^{\prime}\to \ell^{+}\ell^{-}) \simeq 5$（每一代）。这与最小$B-L$模型形成鲜明对比，该模型是模拟研究中常用的基准情景，预测${\rm BR}(Z^{\prime}\to NN)/{\rm BR}(Z^{\prime}\to \ell^{+}\ell^{-}) \simeq 0.5$（每代）。有了这样的增强和一个现实的模型参数的选择，以重现中微子振荡数据，我们得出结论，发现RHN与$300 \; {\rm fb}^{-1}$光度的可能性意味着$Z^\prime$玻色子将被发现的光度$170.5 \;{\rm fb}^{-1}$（$125 \; {\rm fb}^{-1}$）的正常（倒置）轻中微子质量模式的层次。

英文摘要：

Towards experimental confirmations of the type-I seesaw mechanism, we explore a prospect of discovering the heavy Majorana right-handed neutrinos (RHNs) from a resonant production of a new massive gauge boson ($Z^{\prime}$) and its subsequent decay into a pair of RHNs ($Z^{\prime}\to NN$) at the future LHC. Recent simulation studies have shown that the discovery of the RHNs through this process is promising in the future. However, the current LHC data very severely constrains the production cross section of the $Z^{\prime}$ boson into a dilepton final states, $pp \to Z^{\prime}\to \ell^{+}\ell^{-} $ ($\ell=e$ or $μ$). Extrapolating the current bound to the future, we find that a significant enhancement of the branching ratio ${\rm BR}(Z^{\prime}\to NN$) over ${\rm BR}(Z^{\prime}\to \ell^{+}\ell^{-}$) is necessary for the future discovery of RHNs. As a well-motivated simple extension of the Standard Model (SM) to incorporate the $Z^\prime$ boson and the type-I seesaw mechanism, we consider the minimal U(1)$_X$ model. We point out that this model can yield a significant enhancement up to ${\rm BR}(Z^{\prime}\to NN)/{\rm BR}(Z^{\prime}\to \ell^{+}\ell^{-}) \simeq 5$ (per generation). This is in sharp contrast with the minimal $B-L$ model, a benchmark scenario commonly used in simulation studies, which predicts ${\rm BR}(Z^{\prime}\to NN)/{\rm BR}(Z^{\prime}\to \ell^{+}\ell^{-}) \simeq 0.5$ (per generation). With such an enhancement and a realistic model-parameter choice to reproduce the neutrino oscillation data, we conclude that the possibility of discovering RHNs with a $300 \; {\rm fb}^{-1}$ luminosity implies that the $Z^\prime$ boson will be discovered with a luminosity of $170.5 \;{\rm fb}^{-1}$ ($125 \; {\rm fb}^{-1}$) for the normal (inverted) hierarchy of the light neutrino mass pattern.

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。

↑