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<p>We study neutrinoless double-beta decay in extensions of the Standard Model that include <i>n</i> right-handed neutrino singlets, with masses <i>m</i><sub><i>s</i></sub> below the GeV scale. Generalizing recently developed matching methods, we determine the <i>m</i><sub><i>s</i></sub> dependence of the short-range <i>nn</i> → <i>pp</i> couplings that appear to leading order in the chiral effective field theory description of neutrinoless double beta decay. We focus on two scenarios, corresponding to the minimal <i>ν</i>SM and left-right symmetric models. We illustrate the impact of our new results in the case of the <i>ν</i>SM, showing a significant impact on the neutrinoless double-beta decay half-life when <i>m</i><sub><i>s</i></sub> is in the 200–800 MeV range.</p>

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Neutrinoless double β decay with light sterile neutrinos: the contact terms

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年4月23日

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  • Vincenzo Cirigliano,
  • Wouter Dekens,
  • Sebastián Urrutia Quiroga

摘要

We study neutrinoless double-beta decay in extensions of the Standard Model that include n right-handed neutrino singlets, with masses ms below the GeV scale. Generalizing recently developed matching methods, we determine the ms dependence of the short-range nn → pp couplings that appear to leading order in the chiral effective field theory description of neutrinoless double beta decay. We focus on two scenarios, corresponding to the minimal νSM and left-right symmetric models. We illustrate the impact of our new results in the case of the νSM, showing a significant impact on the neutrinoless double-beta decay half-life when ms is in the 200–800 MeV range.