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arXiv 1109.3452hep-phastro-ph.COnucl-exnucl-th
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惰性中微子暖暗物质在铼和氚β衰变中的作用

Role of Sterile Neutrino Warm Dark Matter in Rhenium and Tritium Beta Decays

H. J. de Vega, O. Moreno, E. Moya de Guerra, M. Ramon Medrano, N. Sanchez

摘要:

质量在1到几keV范围内的惰性中微子作为粒子物理学标准模型的扩展是重要的,并且是严重的暗物质(DM)候选者。这个DM质量尺度(暖DM)与宇宙学和银河系的观测结果一致。本文研究了keV无菌中微子与轻活性中微子在铼187和氚β衰变中的混合作用。我们确定了β粒子的能谱0 < T_e <(Q_{beta} - m_s),作为可以探测到无菌中微子和测量其质量m_s的区域。这个能量区域与位于端点Q_{beta}附近的适于测量轻活性中微子质量的区域相距至少1 keV。在β衰变中,一个keV的无菌中微子的发射可以在发射的β粒子的光谱中表现为一个小的扭结。有鉴于此,我们进行了仔细的计算的铼和氚β光谱和估计的大小,这种扰动的无量纲比率R的无菌中微子的活性中微子的贡献。我们评论的可能性,目前正在运行的两个实验,MARE和KATRIN,分别集中在铼187和氚β衰变中寻找无菌中微子签名。

英文摘要:

Sterile neutrinos with mass in the range of one to a few keV are important as extensions of the Standard Model of particle physics and are serious dark matter (DM) candidates. This DM mass scale (warm DM) is in agreement with both cosmological and galactic observations. We study the role of a keV sterile neutrino through its mixing with a light active neutrino in Rhenium 187 and Tritium beta decays. We pinpoint the energy spectrum of the beta particle, 0 < T_e < (Q_{beta} - m_s), as the region where a sterile neutrino could be detected and where its mass m_s could be measured. This energy region is at least 1 keV away rom the region suitable to measure the mass of the light active neutrino, located near the endpoint Q_{beta} . The emission of a keV sterile neutrino in a beta decay could show up as a small kink in the spectrum of the emitted beta particle. With this in view, we perform a careful calculation of the Rhenium and Tritium beta spectra and estimate the size of this perturbation by means of the dimensionless ratio R of the sterile neutrino to the active neutrino contributions. We comment on the possibility of searching for sterile neutrino signatures in two experiments which are currently running at present, MARE and KATRIN, focused on the Rhenium 187 and Tritium beta decays respectively.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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