Neutrinoless double beta decay rates in the presence of light sterile neutrinos

被引：0

作者：

Dekens, W. ^{[1
]}

de Vries, J. ^{[2
,3
,4
]}

Castillo, D. ^{[5
]}

Menendez, J. ^{[5
,6
]}

Mereghetti, E. ^{[7
]}

Plakkot, V. ^{[2
,3
,4
]}

Soriano, P. ^{[5
,6
]}

Zhou, G. ^{[8
,9
]}

机构：

[1] Univ Washington, Inst Nucl Theory, Seattle, WA 98195 USA

[2] Univ Amsterdam, Inst Phys Amsterdam, Sci Pk 904, NL-1098 XH Amsterdam, Netherlands

[3] Univ Amsterdam, Delta Inst Theoret Phys, Sci Pk 904, NL-1098 XH Amsterdam, Netherlands

[4] Nikhef, Theory Grp, Sci Pk 105, NL-1098 XG Amsterdam, Netherlands

[5] Univ Barcelona, Dept Fis Quant & Astrofis, Marti i Franques 1, Barcelona 08028, Spain

[6] Univ Barcelona, Inst Ciencies Cosmos, Marti i Franques 1, Barcelona 08028, Spain

[7] Los Alamos Natl Lab, Theoret Div, Los Alamos, NM 87545 USA

[8] Shenzhen Audaque Data Technol Co Ltd, Shenzhen 518057, Peoples R China

[9] Dalian Univ Technol, Sch Comp Sci & Technol, Dalian 116024, Peoples R China

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2024年 / 09期

基金：

荷兰研究理事会;

关键词：

New Light Particles; Sterile or Heavy Neutrinos; Baryon/Lepton Number Violation; Specific BSM Phenomenology; MASS; MODEL;

D O I：

10.1007/JHEP09(2024)201

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

We investigate neutrinoless double-beta decay (0 nu beta beta) in minimal extensions of the Standard Model of particle physics where gauge-singlet right-handed neutrinos give rise to Dirac and Majorana neutrino mass terms. We argue that the standard treatment of these scenarios, based on mass-dependent nuclear matrix elements, is missing important contributions to the 0 nu beta beta amplitude. First, new effects arise from the exchange of neutrinos with very small (ultrasoft) momenta, for which we compute the associated nuclear matrix elements for the decays of 76Ge and 136Xe. These contributions can dominate the 0 nu beta beta rate in cases with light sterile neutrinos. The ultrasoft terms are also relevant in the more standard scenario of just three light Majorana neutrinos where they lead to a 10% reduction of the total 0 nu beta beta amplitude. Secondly, we highlight the importance of short-range terms associated with medium-heavy sterile neutrinos and provide explicit formulae that can be used in phenomenological analyses. As examples we discuss impact of these new effects in several explicit scenarios, including a realistic 3 + 2 model with two right-handed gauge-singlet neutrinos.

引用

页数：48

共 123 条

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