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<p>We discuss the role of heavy scalar fields in mediating neutrinoless double beta decay (0<i>νββ</i>) within the SU(5) Grand Unified Theory framework, extended suitably to include neutrino mass. In such a minimal realistic SU(5) setup for fermion masses, the scalar contributions to 0<i>νββ</i> are extremely suppressed as a consequence of the proton decay bound. We circumvent this problem by imposing a discrete <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\({\mathcal{Z}}_{3}\)</EquationSource> </InlineEquation> symmetry. However, the scalar contributions to 0<i>νββ</i> remain suppressed in this <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(\text{SU}(5)\times {\mathcal{Z}}_{3}\)</EquationSource> </InlineEquation> model due to the neutrino mass constraint. We find that the 0<i>νββ</i> contribution can be enhanced by extending the scalar sector with an additional <b>15</b>-dimensional scalar representation with suitable <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\({\mathcal{Z}}_{3}\)</EquationSource> </InlineEquation> charge. Such an extension not only yields realistic fermion mass spectra but also leads to experimentally testable predictions in upcoming ton-scale 0<i>νββ</i> searches, which can be used as a sensitive probe of the new scalars across a broad range, from LHC-accessible scales up to <i>∼</i> 10<sup>10</sup> GeV.</p>

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Scalar-induced neutrinoless double beta decay in SU(5)

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月8日

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  • P. S. Bhupal Dev,
  • Srubabati Goswami,
  • Debashis Pachhar,
  • Saurabh K. Shukla

摘要

We discuss the role of heavy scalar fields in mediating neutrinoless double beta decay (0νββ) within the SU(5) Grand Unified Theory framework, extended suitably to include neutrino mass. In such a minimal realistic SU(5) setup for fermion masses, the scalar contributions to 0νββ are extremely suppressed as a consequence of the proton decay bound. We circumvent this problem by imposing a discrete \({\mathcal{Z}}_{3}\) symmetry. However, the scalar contributions to 0νββ remain suppressed in this \(\text{SU}(5)\times {\mathcal{Z}}_{3}\) model due to the neutrino mass constraint. We find that the 0νββ contribution can be enhanced by extending the scalar sector with an additional 15-dimensional scalar representation with suitable \({\mathcal{Z}}_{3}\) charge. Such an extension not only yields realistic fermion mass spectra but also leads to experimentally testable predictions in upcoming ton-scale 0νββ searches, which can be used as a sensitive probe of the new scalars across a broad range, from LHC-accessible scales up to ∼ 1010 GeV.