Distinguishing Dirac and Majorana neutrinos with astrophysical fluxes
| Autor: | Mauro Napsuciale, Juan Barranco, A. Yebra, D. Delepine |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Physics
Nuclear and High Energy Physics Particle physics Physics::Instrumentation and Detectors Solar neutrino Dirac (video compression format) Physics beyond the Standard Model Astrophysics::High Energy Astrophysical Phenomena High Energy Physics::Phenomenology FOS: Physical sciences Helicity MAJORANA Supernova High Energy Physics - Phenomenology High Energy Physics - Phenomenology (hep-ph) High Energy Physics::Experiment Neutrino Borexino |
| Popis: | Massive neutrinos can have helicity $s_{\parallel}\neq -1$. Neutrino helicity changes when the neutrino interacts with an external magnetic field and it is possible that the left-handed neutrinos born inside the Sun or a supernova could leave their sources with a different helicity. Since Dirac and Majorana neutrinos have different cross sections in the scattering on electrons for different neutrino helicities, a change in the final neutrino helicity may generate a different number of events and spectra in terrestrial detectors when astrophysical neutrinos have travelled regions with strong magnetic fields. In this work, we show that looking for these effects in solar neutrinos, it could be possible to set bounds in the neutrino properties such as the neutrino magnetic moment. Furthermore, for neutrinos coming from a supernova, we show that even in the case of an extremely small neutrino magnetic moment, $\mu_\nu \sim 10^{-19}\mu_B$, there will be measurable differences in both the number of events and in the spectra of Majorana and Dirac neutrinos. Comment: 6 pages, 5 figures. Upgraded results, title changed |
| Databáze: | OpenAIRE |
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