arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2402.08652hep-ph
收藏

暗物质作为顶夸克味改变中性流衰变的触发器

Dark matter as the trigger of flavor changing neutral current decays of the top quark

Adil Jueid, Shinya Kanemura

AI总结:

提出一个包含带色标量介子和右旋费米子的简化模型,同时解决暗物质问题并在单圈阶引发顶夸克味改变中性流衰变,通过参数空间分析和对撞机限制验证了暗物质与顶夸克FCNC过程的联系。

摘要:

我们提出了一个简化模型,该模型同时解决暗物质问题,并在单圈阶引发顶夸克的味改变中性流(FCNC)相互作用。该模型包含两个额外的$SU(2)_L$规范单态:一个自旋为零的带色介子($S$)和一个右旋费米子($χ$),两者在一个特定的$Z_2$对称性下均为奇。右旋费米子扮演暗物质候选者的角色。在此模型中,这两种暗区粒子的存在引发了单圈诱导的顶夸克衰变为轻夸克和玻色子(如胶子、光子、$Z$玻色子或Higgs玻色子)的FCNC过程。作为案例研究,我们分析了顶夸克FCNC衰变为轻夸克($u$或$c$)和$Z$或Higgs玻色子的过程。随后,我们通过估计参数空间中与\ extsc{Planck}对暗物质遗迹密度的测量相一致的区域,研究了暗物质问题的可靠解决方案。我们还重新审视了在大型强子对撞机(LHC)上,在至少含有一个高$p_T$喷注和大横向缺失能量的事件中搜寻暗物质的限制。接着,我们定义了四个与现有对撞机实验和宇宙学限制相一致的基准点。最后,针对这些基准场景,我们估算了一系列广泛通道的比率,这些通道可用于在HL-LHC和未来的$100$ TeV对撞机上探究顶夸克FCNC跃迁与暗物质之间的联系。

英文摘要:

We suggest a simplified model that simultaneously addresses the dark-matter problem and give rise to top quark flavor changing neutral current (FCNC) interactions at the one-loop order. The model consists of two extra $SU(2)_L$ gauge singlets: a colored mediator of spin zero ($S$) and a right-handed fermion ($χ$) both are odd under an ad-hoc $Z_2$ symmetry. The right-handed fermion plays the role of the dark-matter candidate. In this model, the presence of the two dark sector particles generates one-loop induced FCNC decays of the top quark into light quarks and bosons such as the gluon, the photon, the $Z$-boson or the Higgs boson. As a case study, we analyze the top quark FCNC decays into light quarks ($u$ or $c$) and a $Z$ or Higgs bosons. We then study the reliable solutions to the dark-matter problem by estimating the regions in the parameter space that are consistent with the \textsc{Planck} measurement of the dark-matter relic density. We also revisit the bounds from the searches of dark matter in events with at least one high-$p_T$ jet and large missing transverse energy at the Large Hadron Collider (LHC). We then define four benchmark points that are consistent with the existing constraints from collider experiments and cosmology. We finally estimate, for these benchmark scenarios, the rates of a broad range of channels that can be used to probe the connection between the top FCNC transitions and dark matter both at the HL-LHC and a future $100$ TeV collider.

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。

↑