Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-05-16
Mod.Phys.Lett.A24:219-227,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
v2: References and comments added. v3: reference numbers changed. Accepted for Mod. Phys. Lett. A
Scientific paper
10.1142/S021773230902814X
The possibility to access the absolute neutrino mass scale through the measurement of the wrong helicity contribution of charged leptons is investigated in pion decay. Through this method, one may have access to the same effective mass $m^2_\beta$ extractable from the tritium beta decay experiments for electron neutrinos as well as the analogous effective mass $(m^2_{\nu_\mu})_{\rm eff}$ for muon neutrinos. In the channel $\pi^-\to e^-\bar{\nu}$, the relative probability of producing an antineutrino with left helicity is enhanced if compared with the naive expectation $(m_\nu/2E_\nu)^2$. The possibility to constrain new interactions in the context of Two-Higgs-Doublet models is also investigated.
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