Interplay of type-I and type-II seesaw in neutrinoless double beta decay in left-right symmetric model

IF 2.5 3区物理与天体物理 Q2 PHYSICS, PARTICLES & FIELDS

Nuclear Physics B Pub Date : 2024-07-11 DOI:10.1016/j.nuclphysb.2024.116623

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Abstract

The left-right symmetric models (LRSM) generally include type-I and type-II induced seesaw masses as a hybrid mass for the light-active neutrinos. Assuming a particular form of Dirac-type coupling, the Majorana-type coupling present in the seesaw mass formula can be expressed in terms of low-energy neutrino oscillation observables and vacuum expectation values (vevs) of the scalar fields present in the model. The Majorana-type coupling thus admits eight different solutions by considering whether the type-I and type-II terms dominate the light neutrino mass. We study the role of all eight solutions in the lepton number violating neutrinoless double beta decay ( $0 ν β β$ ) process. In LRSM, the right-handed neutrinos, triplet scalars, and gauge bosons of the left and right sectors act as mediators of new contributions to the $0 ν β β$ process. As a result, the effective mass of electron neutrino appearing in the decay width would be a function of $v_{R}$ (vev of the Higgs triplet of the right sector) along with other parameters of the model, through the masses of the new contributions. The energy scale, $v_{R}$ can be considered as the new physics scale which allows exploring physics beyond the Standard Model. Considering the present and future sensitivity of searches of $0 ν β β$ , we study the role of eight different solutions of the Majorana coupling matrix. In our study, the inverted hierarchy of light neutrino masses is disfavored for all solutions keeping future sensitivity of effective mass in the picture, if the lightest mass of active neutrinos is below 0.001 eV. Also, our study shows a possibility of new physics contributions saturating the experimental bound on effective mass for $v_{R}$ in the range of 10 TeV for two particular solutions of the Majorana coupling matrix and simultaneously provides the insights about parity breaking scale.

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左右对称模型中无中和双贝塔衰变中 I 型和 II 型跷跷板的相互作用

左右对称模型（LRSM）通常包括第一类和第二类诱导跷跷板质量，作为轻活性中微子的混合质量。假设有一种特殊形式的狄拉克型耦合，跷跷板质量公式中的马约拉纳型耦合可以用低能中微子振荡观测值和模型中标量场的真空期望值（vevs）来表示。因此，通过考虑 I 型和 II 型项是否主导轻中微子质量，马约拉纳型耦合有八种不同的解决方案。我们研究了所有八种方案在违反轻子数的无中微子双β衰变（0νβ）过程中的作用。在 LRSM 中，左右部门的右手中微子、三重标量和规玻色子充当了 0νββ 过程新贡献的媒介。因此，通过新贡献的质量，衰变宽度中出现的电子中微子的有效质量将是 vR（右扇区希格斯三胞胎的脉宽）和模型其他参数的函数。能量尺度 vR 可被视为新物理学尺度，它允许探索标准模型之外的物理学。考虑到现在和未来搜索 0νββ 的灵敏度，我们研究了马约拉纳耦合矩阵的八个不同解的作用。在我们的研究中，如果有源中微子的最轻质量低于 0.001 eV，那么所有方案都不赞成轻中微子质量的倒置层次，以保持未来对有效质量的敏感性。此外，我们的研究还表明，对于马约拉纳耦合矩阵的两个特定解，新物理贡献有可能使 vR 在 10 TeV 范围内的有效质量实验约束达到饱和，并同时提供了关于奇偶性破缺尺度的见解。

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来源期刊

Nuclear Physics B 物理-物理：粒子与场物理

CiteScore

5.50

自引率

7.10%

发文量

302

审稿时长

1 months

期刊介绍： Nuclear Physics B focuses on the domain of high energy physics, quantum field theory, statistical systems, and mathematical physics, and includes four main sections: high energy physics - phenomenology, high energy physics - theory, high energy physics - experiment, and quantum field theory, statistical systems, and mathematical physics. The emphasis is on original research papers (Frontiers Articles or Full Length Articles), but Review Articles are also welcome.

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