Statistical criteria for search of heavy neutrino in tritium spectrum

14th International Conference on Topics in Astroparticle and Underground Physics

物理学;天文学

Lokhov, Alexey^1 ; Tkachov, Fyodor^1

Institute for Nuclear Research, RAS, Moscow

117312, Russia^1

关键词: Beta decay;    Neutrino mass;    Optimal criteria;    Power functions;    Quasi-optimal;    Statistical criterion;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/718/6/062039/pdf
DOI  :  10.1088/1742-6596/718/6/062039

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

The method of quasi-optimal weights is applied to constructing (quasi-)optimal criteria for search of heavy (4th generation) neutrino contribution in experimental β-decay spectra. Various approaches to searching for anomalous contributions in spectra are discussed. In particular the tritium β-decay spectrum (for instance, in Troitsk-v-mass, Mainz Neutrino Mass and KATRIN experiments) is analyzed using the derived special criteria. The power functions constructed for each criteria show the efficiency of the derived quasi-optimal criteria as statistical instruments for detecting the anomalous contributions in the spectra. The overall sensitivity of the criteria is estimated.