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Distinguishing between Dirac and Majorana neutrinos in the presence of general interactions

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Rodejohann,  Werner
Werner Rodejohann - ERC Starting Grant, Junior Research Groups, MPI for Nuclear Physics, Max Planck Society;

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Xu,  Xunjie
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

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Yaguna,  Carlos E.
Werner Rodejohann - ERC Starting Grant, Junior Research Groups, MPI for Nuclear Physics, Max Planck Society;

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Citation

Rodejohann, W., Xu, X., & Yaguna, C. E. (2017). Distinguishing between Dirac and Majorana neutrinos in the presence of general interactions. Journal of high energy physics: JHEP, 2017(5): 024. doi:10.1007/JHEP05(2017)024.


Cite as: http://hdl.handle.net/21.11116/0000-0000-FE47-3
Abstract
We revisit the possibility of distinguishing between Dirac and Majorana neutrinos via neutrino-electron elastic scattering in the presence of all possible Lorentz-invariant interactions. Defining proper observables, certain regions of the parameter space can only be reached for Dirac neutrinos, but never for Majorana neutrinos, thus providing an alternative method to differentiate these two possibilities. We first derive analytically and numerically the most general conditions that would allow to distinguish Dirac from Majorana neutrinos, both in the relativistic and non-relativistic cases. Then, we apply these conditions to data on nu(mu)-e and (nu) over bar (e)-e scatterings, from the CHARM-II and TEXONO experiments, and find that they are consistent with both types of neutrinos. Finally, we comment on future prospects of this kind of tests.