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arXiv 1802.08019hep-ph
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无中子双β衰变伴大量标量辐射

Neutrinoless double-beta decay with massive scalar emission

Kfir Blum, Yosef Nir, Michal Shavit

摘要:

无中微子双β衰变($0\nu2β$)的研究对那些在标准模型之外的光场参与中微子质量机制的模型提出了重要的限制。虽然$0\nu2β$实验合作经常考虑各种无质量的majoron模型,包括各种形式的majoron耦合和多majoron终态过程,但这些搜索都没有考虑“majoron”$ϕ$不是无质量的情况,$m_ϕ\sim$ ~MeV,与$0\nu2β$反应的$Q$值相同。我们认为这个参数区域和估计$0\nu2βϕ$的$m_ϕ$的顺序MeV的限制。约束不仅受运动学相空间抑制的影响,而且受表征搜索的信号与背景比的变化的影响。因此,$m_ϕ>0$的$0\nu2βϕ$约束显著减小到反应阈值以下。这具有现象学意义,我们将重点放在高能中微子望远镜上。我们的研究结果激发了专门的分析$0\nu2β$合作,类似于针对无质量的majoron模型的专门分析。

英文摘要:

Searches for neutrino-less double-beta decay ($0\nu2β$) place an important constraint on models where light fields beyond the Standard Model participate in the neutrino mass mechanism. While $0\nu2β$ experimental collaborations often consider various massless majoron models, including various forms of majoron couplings and multi-majoron final-state processes, none of these searches considered the scenario where the "majoron" $ϕ$ is not massless, $m_ϕ\sim$~MeV, of the same order as the $Q$-value of the $0\nu2β$ reaction. We consider this parameter region and estimate $0\nu2βϕ$ constraints for $m_ϕ$ of order MeV. The constraints are affected not only by kinematical phase space suppression but also by a change in the signal to background ratio characterizing the search. As a result, $0\nu2βϕ$ constraints for $m_ϕ>0$ diminish significantly below the reaction threshold. This has phenomenological implications, which we illustrate focusing on high-energy neutrino telescopes. Our results motivate a dedicated analysis by $0\nu2β$ collaborations, analogous to the dedicated analyses targeting massless majoron models.

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