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标量轻子夸克诱导的无中微子双β衰变：与中微子质量及味物理的相互作用

Neutrinoless Double Beta Decay from Scalar Leptoquarks: Interplay with Neutrino Mass and Flavor Physics

P. S. Bhupal Dev, Srubabati Goswami, Chayan Majumdar, Debashis Pachhar

备注：
43 pages, 9 figures and 6 tables (version to appear in JHEP)
发表信息：
JHEP01(2025)004
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AI总结：

本文在含两种标量轻子夸克的辐射中微子质量模型中，结合味物理、对撞机与中微子约束开展全局分析，揭示轻子夸克对无中微子双β衰变有效质量及未来吨级实验可达性的影响。

摘要：

我们在一个包含标量轻子夸克 $S_1(\bar{3},1,1/3)$ 与 $\widetilde{R}_2(3,2,1/6)$ 的辐射中微子质量模型中，对无中微子双β衰变及其与低能味可观测量之间的相互作用进行了全面分析。我们刻画出与中微子质量和混合、对撞机搜寻以及若干味可观测量测量结果相容的参数区域；这些可观测量包括μ子和电子反常磁矩、带电轻子味破坏，以及罕见的（半）轻子K介子和B介子衰变，其中涵盖近期在 $R_{D^{(*)}}$ 和 $B\to Kν\barν$ 可观测量中出现的反常。我们对所有现有约束进行全局分析，并展示满足这些限制的所有相关Yukawa耦合之间的（反）关联。我们发现，对参数空间最严格的约束来自原子核中的 $μ\to e$ 转换以及 $K^{+} \rightarrow\\, π^{+}ν\barν$ 衰变。我们还指出，在此背景下μ子与电子的 $(g-2)$ 反常之间存在张力。利用联合允许区域中的基准值，我们研究了其对无中微子双β衰变的影响，同时纳入标准轻中微子贡献和轻子夸克贡献。我们发现，对于中微子质量的正常排序，轻子夸克贡献消除了标准情形中出现的相消区域。存在轻子夸克时的有效质量可位于标准正常排序与反序情形之间的荒漠区域，而这可由LEGEND-1000和nEXO等未来吨级实验进行探测。

英文摘要：

We perform a comprehensive analysis of neutrinoless double beta decay and its interplay with low-energy flavor observables in a radiative neutrino mass model with scalar leptoquarks $S_1(\bar{3},1,1/3)$ and $\widetilde{R}_2(3,2,1/6)$. We carve out the parameter region consistent with constraints from neutrino mass and mixing, collider searches, as well as measurements of several flavor observables, such as muon and electron anomalous magnetic moments, charged lepton flavor violation and rare (semi)leptonic kaon and $B$-meson decays, including the recent anomalies in $R_{D^{(*)}}$ and $B\to Kν\barν$ observables. We perform a global analysis to all existing constraints and show the (anti)correlations between all relevant Yukawa couplings satisfying these restrictions. We find that the most stringent constraint on the parameter space comes from $μ\to e$ conversion in nuclei and $K^{+} \rightarrow\, π^{+}ν\barν$ decay. We also point out a tension between the muon and electron $(g-2)$ anomalies in this context. Taking benchmark values from the combined allowed regions, we study the implications for neutrinoless double beta decay including both the canonical light neutrino and the leptoquark contributions. We find that for normal ordering of neutrino masses, the leptoquark contribution removes the cancellation region that occurs for the canonical case. The effective mass in presence of leptoquarks can lie in the desert region between the standard normal and inverted ordering cases, and this can be probed in future ton-scale experiments like LEGEND-1000 and nEXO.

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