arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 2303.06374hep-ph
收藏

非最小SU(5)模型中τ→Kπν_τ的CP不对称性

CP Asymmetry in $τ\to Kπν_τ $ within Non-Minimal $SU(5)$

Gaber Faisel, S. Khalil

AI总结:

本文在非最小SU(5)模型中用45维Higgs多重态的颜色三重态标量轻子夸克解释τ→K_S^0 π^- ν_τ中CP不对称的2.8σ偏差,并预言τ^- → K^- π^0 ν_τ中量级为10^{-3}的可观测CP不对称。

摘要:

半轻子τ衰变中的直接CP不对称性是超出标准模型新物理的一个引人关注的迹象。我们在具有45维Higgs多重态的非最小SU(5)模型中研究了τ^- → K_S^0 π^- ν_τ和τ^- → K^- π^0 ν_τ衰变中的CP不对称性。我们证明,伴随的颜色三重态标量是标量轻子夸克的一个自然例子,它介导τ→s ū ν_τ跃迁,并解释了A_CP(τ^- → K_S^0 π^- ν_τ)实验结果与标准模型预期之间2.8σ的偏差。此外,它预言了量级为O(10^{-3})的可观A_CP(τ^- → K^- π^0 ν_τ),这可以在当前和近期实验中观测到。

英文摘要:

Direct CP asymmetry in semi-leptonic $τ$ decays is an intriguing hint for new physics beyond the standard model. We investigate the CP asymmetry in $τ^- \to K_S^0 π^- ν_τ$ and $τ^- \to K^- π^0 ν_τ$ decays in non-minimal SU(5) model, with 45-dimensional Higgs multiplet. We show that the associate color-triplet scalar is a natural example of a scalar leptoquark that mediates the transition $τ\to s \bar u ν_τ$, and accounts for the 2.8 $σ$ discrepancy between the $A_{\rm CP}(τ^- \to K_S^0 π^- ν_τ)$ experimental results and the SM expectation. Furthermore, it predicts a sizable $A_{\rm CP}(τ^- \to K^- π^0 ν_τ)$, of order ${\cal O}(10^{-3})$, which can be accessible in current and near future experiments.

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。

↑