Resolving the Reactor Neutrino Anomaly with the KATRIN Neutrino Experiment

Details Resolving the Reactor Neutrino Anomaly with the KATRIN Neutrino Experiment Resolving the Reactor Neutrino Anomaly with the KATRIN Neutrino Experiment

2011-05-06

arxiv.org/abs/1105.1326v1

Physics Letters B 706 (2011), pp. 68-71

Physics

Nuclear Physics

Nuclear Experiment

5 pages, 2 figures. Submitted to PRD

Scientific paper

The KArlsruhe TRItium Neutrino experiment (KATRIN) combines an ultra-luminous molecular tritium source with an integrating high-resolution spectrometer to gain sensitivity to the absolute mass scale of neutrinos. The projected sensitivity of the experiment on the electron neutrino mass is 200 meV at 90% C.L. With such unprecedented resolution, the experiment is also sensitive to physics beyond the Standard Model, particularly to the existence of additional sterile neutrinos at the eV mass scale. A recent analysis of available reactor data appears to favor the existence of such such a sterile neutrino with a mass splitting of $|\Delta m_{\rm sterile}|^2 \ge 1.5$ eV$^2$ and mixing strength of $\sin^2{2\theta_{\rm sterile}} = 0.17\pm 0.08$ at 95% C.L. Upcoming tritium beta decay experiments should be able to rule out or confirm the presence of the new phenomenon for a substantial fraction of the allowed parameter space.

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