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arXiv 2209.07971hep-ph
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具有trans-Planckian渐近安全性的味异常对$Z'$解的约束

Constraints on $Z'$ solutions to the flavor anomalies with trans-Planckian asymptotic safety

Abhishek Chikkaballi, Wojciech Kotlarski, Kamila Kowalska, Daniele Rizzo, Enrico Maria Sessolo

摘要:

受$b \to s$跃迁中味道异常的启发,我们在trans-Planckian渐近安全的框架中嵌入了具有$Z'$规范玻色子、类矢量费米子和单重标量的极小模型。在模型参数的重整化群流中存在一个固定点,这导致了对$γ/Z'$动力学混合、新物理汤川耦合和标量势的四次耦合的预测。我们从LHC最近的高质量双轻子共振搜索中推导出动力学混合的约束,表明在这个框架中,这种约束通常是不可避免的,除非U(1)电荷合谋禁止动力学混合的辐射产生。在后一种情况下,与味异常一致的参数空间仍然可以通过直接LHC搜索重矢量类夸克和轻子来深入探索。我们推导出目前的排斥界限和预测未来的高光度运行。

英文摘要:

Motivated by the flavor anomalies in $b \to s$ transitions, we embed minimal models with a $Z'$ gauge boson, vector-like fermions, and a singlet scalar in the framework of trans-Planckian asymptotic safety. The presence of a fixed point in the renormalization group flow of the models' parameters leads to predictions for the $γ/Z'$ kinetic mixing, the New Physics Yukawa couplings, and the quartic couplings of the scalar potential. We derive the constraint on the kinetic mixing from the most recent high-mass dilepton resonance searches at the LHC, showing that this bound is often inescapable in this framework, unless the U(1) charges conspire to forbid the radiative generation of kinetic mixing. In the latter case, the parameter space consistent with the flavor anomalies can still be probed in depth by direct LHC searches for heavy vector-like quarks and leptons. We derive the current exclusion bounds and projections for future high-luminosity runs.

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