Neutrino Propagation in Nuclear Medium and Neutrinoless Double-β Decay

S. Kovalenko, M. I. Krivoruchenko, and F. Šimkovic
Phys. Rev. Lett. 112, 142503 – Published 11 April 2014

Abstract

We discuss a novel effect in neutrinoless double-β (0νββ) decay related with the fact that its underlying mechanisms take place in the nuclear matter environment. We study the neutrino exchange mechanism and demonstrate the possible impact of nuclear medium via lepton-number-violating (LNV) four-fermion interactions of neutrinos with quarks from a decaying nucleus. The net effect of these interactions is the generation of an effective in-medium Majorana neutrino mass matrix. The enhanced rate of the 0νββ decay can lead to the apparent incompatibility of observations of the 0νββ decay with the value of the neutrino mass determined or restricted by the β-decay and cosmological data. The effective neutrino masses and mixing are calculated for the complete set of the relevant four-fermion neutrino-quark operators. Using experimental data on the 0νββ decay in combination with the β-decay and cosmological data, we evaluate the characteristic scales of these operators: ΛLNV2.4TeV.

  • Figure
  • Received 25 November 2013

DOI:https://doi.org/10.1103/PhysRevLett.112.142503

© 2014 American Physical Society

Authors & Affiliations

S. Kovalenko1, M. I. Krivoruchenko2,3, and F. Šimkovic4,5,6

  • 1Universidad Técnica Federico Santa María, Centro-Cientifico-Tecnológico de Valparaiso, Casilla 110-V, Valparaiso, Chile
  • 2Institute for Theoretical and Experimental Physics, B. Cheremushkinskaya 25, 117218 Moscow, Russia
  • 3Department of Nano-, Bio-, Information, and Cognitive Technologies, Moscow Institute of Physics and Technology, 141700 Dolgoprudny, Russia
  • 4Bogoliubov Laboratory of Theoretical Physics, JINR, 141980 Dubna, Russia
  • 5Department of Nuclear Physics and Biophysics, Comenius University, Mlynská Dolina F1, SK-842 48 Bratislava, Slovakia
  • 6Czech Technical University in Prague, CZ-12800 Prague, Czech Republic

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Issue

Vol. 112, Iss. 14 — 11 April 2014

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