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Neutrino Physics

Neutrino Physics. José Bernabéu IFIC-University of Valencia December 2007. Neutrino Physics. History and Interest First evidence of neutrino masses Origin of masses? - Experiment - Beyond Standard Model Dimension 5: Majorana ’s Grand Unification Scale: See-saw Leptogenesis

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Neutrino Physics

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  1. Neutrino Physics José Bernabéu IFIC-University of Valencia December 2007

  2. Neutrino Physics • History and Interest • First evidence of neutrino masses • Origin of masses? - Experiment - Beyond Standard Model • Dimension 5: Majorana ’s • Grand Unification Scale: See-saw • Leptogenesis • CP-violation  Future experiments • Neutrino oscillations & Underground Physics

  3. The Birth of the Neutrino

  4. History: Up’s & Down’s 1930  Pauli, 1933  Fermi 1956  Cowan & Reines 1957  Two-component  theory: Weyl  Argument in favour of vanishing m Only L in weak interactions Goldhaber experiment 1958  (V-A) theory  CHIRAL Fields enter FOR ALL Fermions  Nothing special for ’s No reason why m =0 BUT: eR, qR needed QED, QCD 1967  Standard Model “choice”: no R  m=0 1998  m  0 experimentally…  Dirac Mass  0

  5. Neutrino Experiments

  6. Neutrino flavour oscillations What is known, what is unknown ? Absolute neutrino masses ? 3 H beta decay • Form of the mass spectrum • Matter effect in neutrino propagation Majorana neutrinos ?  0: masses and phases

  7. Origin of masses Why are Neutrino Masses so small? even for a smooth LOG – scale…

  8. The Pontecorvo MNS Matrix  For Flavour oscillations U: 3 mixings, 1 phase • Atmospheric K2K MINOS, CNGS Appearence e! Reactor Disappearence Matter in Atmospheric • Solar KAMLAND

  9. Neutrino oscillations After atmospheric and solar discoveries and accelerator and reactor measurements → θ13 , δ CP violation accessible in appearance experiments Appearance probability: |Ue3| gives the strength of P(ne→νμ) δ acts as a phase shift

  10. Beta/EC CERN Beam  ? Two methods: • Neutrino vs. Antineutrino - Energy Dependence

  11. LSC: Laboratorio Subterráneo de Canfranc

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