Effects of the Left-Right Asymmetry Parameter in the End Point of the Tritium-Beta Spectrum

Authors: A. GUTIERREZ-RODRIGUEZ, M. A. HERNANDEZ-RUIZ, F. RAMIREZ-SANCHEZ

Abstract: We start with a Left-Right Symmetric Model and we analyze the endpoint of the beta decay of tritium ^3H \rightarrow ^3He + e- + bar{\nu}_e. We applied this model to incorporate the right currents, whereby we propose an amplitude whose leptonic part contains the parameter \lambda defined as a left-right asymmetry parameter which measures the parity violation. We realized a numerical computation for the sensibility of the Mainz and Troitsk experiments for m_{\nu_e}= 2.2 eV; and for the future beta decay experiment KATRIN, which will reach a sensitivity of m_{\nu_e} \approx 0.2 eV. We find that the electron energy spectrum for such experiments is light affected by the left-right asymmetry parameter.

Keywords: Models beyond the standard model, Neutrino mass and mixing, Beta decay. Models beyond the standard model, Neutrino mass and mixing, Beta decay.

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