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arXiv 2610.07136hep-ph

顶夸克通过新标量的最小级联衰变

Minimal cascade decay of the top quark through a new scalar

Bogdan A. Dobrescu, Max H. Fieg, Alessandro Russo

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中文总结 AI 辅助

本文提出顶夸克通过新标量φ_t的级联衰变,由维度5算符介导,分支比近1%,并预测了LHC上的特征信号。

中文摘要 AI 辅助

我们探索了顶夸克衰变为一个新标量φ_t加一个粲夸克的可能性。该衰变由一个维度为5的算符介导,该算符可能由重矢量夸克χ的交换产生,其分支比可接近百分之一。在一个最小模型中,φ_t通过允许非标准顶夸克衰变的同一算符衰变,导致末态包含一个c喷注、一个b喷注和一个W玻色子。因此,顶夸克将通过φ_t发生非标准级联衰变,随后再通过一个离壳顶夸克衰变。主要的非标准对撞机信号是t t̄ → c c̄ b b̄ W⁺W⁻过程。此外,在大型强子对撞机上产生矢量夸克将导致χ φ_t j → 3c + b b̄ W W j类型的信号。

英文摘要

We explore a possible decay of the top quark into a new scalar $ϕ_t$ plus a charm quark. The decay is mediated by a dimension-5 operator that may be generated by the exchange of a heavy vectorlike quark, $χ$, and can have a branching fraction close to a percent. In a minimal model, $ϕ_t$ decays due to the same operator that allows the nonstandard top decay, leading to a final state involving a $c$ jet, a $b$ jet and a $W$ boson. Hence, the top quark would undergo a nonstandard cascade decay through $ϕ_t$ and then through an off-shell top quark. The main nonstandard collider signal is a $t \bar t \to c \, \bar c \, b \, \bar b \, W^+ W^-$ process. In addition, production of the vectorlike quark at the LHC would lead to a signal of the type $χϕ_t \, j \to 3c + b \, \bar b \, W W j$.

发表机构

  • Fermilab(费米国家加速器实验室)
  • SLAC National Accelerator Laboratory(斯坦福直线加速器中心)
  • Leinweber Institute for Theoretical Physics, Department of Physics, Stanford University(斯坦福大学莱因韦伯理论物理研究所)

机构由 AI 辅助整理,请以论文原文为准。

补充信息

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