Neutrino mixings from a U(2) flavour symmetry

Details Neutrino mixings from a U(2) flavour symmetry Neutrino mixings from a U(2) flavour symmetry

1999-03-23

arxiv.org/abs/hep-ph/9903460v1

Nucl.Phys. B559 (1999) 17-26

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, uses amsmath

Scientific paper

10.1016/S0550-3213(99)00425-3

We extend a previously developed description of the flavour parameters in the charged fermion sector, based on a U(2) flavour symmetry, to include two main features of the neutrino sector seemingly implied by recent data: a large mixing angle $\theta_{\mu \tau}$ and a large hierarchy in the neutrino squared mass differences. A unified description of quark and lepton masses and mixings emerges. The neatest quantitative predictions are for elements of the unitary mixing matrix in the lepton sector: |V_{\mu 1}| = |V_{e 3} / V_{\mu 3}| = |V_{e 2} / V_{\tau 3}| = \sqrt{m_e / m_\mu}, which go together with the analogous relations in the quark sector: |V_{ub} / V_{cb}| = \sqrt{m_u / m_c}, |V_{td} / V_{ts}| = \sqrt{m_d / m_s}

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