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Neutrinoless Double Beta Decay

Neutrinoless Double Beta Decay. Eung Jin Chun Korea Institute for Advanced Study APS neutrino study: physics/0411216 hep-ph/0412300 Bilenky, et.al., hep-ph/0402250. Key questions by theorists APS neutrino study: physics/0411216.

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Neutrinoless Double Beta Decay

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  1. Neutrinoless Double Beta Decay Eung Jin Chun Korea Institute for Advanced Study APS neutrino study: physics/0411216 hep-ph/0412300 Bilenky, et.al., hep-ph/0402250 Workshop for Underground Experiment and Astroparticle Physics, Muju, 2005. 2. 16-19

  2. Key questions by theoristsAPS neutrino study: physics/0411216 • Are neutrinos their own anti-particles? • What is the pattern of neutrino masses? • Is there CP violation in the leptonic sector? -- Possibly the origin of the matter-antimatter asymmetry of the universe? • Are there additional neutrino species as may be hinted by the LSND experiment? Workshop for Underground Experiment and Astroparticle Physics, Muju, 2005. 2. 16-19

  3. Majorana( = c) or Dirac(c)?L  0 or L= 0 • Neutrinoless double beta decay (0) • Beta decay n p n p e- e-  m     e- e- n p p n Workshop for Underground Experiment and Astroparticle Physics, Muju, 2005. 2. 16-19

  4. Neutrino mass patterns • m = 0.1-0.5 eV : Quasi-Degenerate cosmological mass–200 kg of isotope • m = 0.02-0.05 eV : Inverted-Hierarchy or QD with Normal-Hierarchy atmospheric neutrino mass–1 ton • m = 2-5 meV : QD, IH, NH solar neutrino mass–100 tons Workshop for Underground Experiment and Astroparticle Physics, Muju, 2005. 2. 16-19

  5. Tritium beta decay me < 2.2 eV at Mainz & Troitsk Workshop for Underground Experiment and Astroparticle Physics, Muju, 2005. 2. 16-19

  6. Cosmolgy • Neutrino dark matter (hot) h2 = i mi/92.5 eV • Power spectrum of small scale structure dFS (Gpc) » 1/m (eV) * current bound : i mi < 0.2-0.6 eV * future sensitivity : 0.14 eV (Planck) Workshop for Underground Experiment and Astroparticle Physics, Muju, 2005. 2. 16-19

  7. ( Astrophysics )physics/0411216 • Detection of the GZK neutrinos (E > 1015 eV), produced from the interactions of UHECR protons with CMBR • $10 million to enhance radio-based technologies or develop new technologies reaching 10 x sensitivity. Workshop for Underground Experiment and Astroparticle Physics, Muju, 2005. 2. 16-19

  8. ( An astrophysical neutrino flux model ) Workshop for Underground Experiment and Astroparticle Physics, Muju, 2005. 2. 16-19

  9. l = I Uli eii/2i l = e, ,  and i = 1, 2, 3 three angles: ij; three phases: 1,2, ; three masses: mi Neutrino mases and mixing Workshop for Underground Experiment and Astroparticle Physics, Muju, 2005. 2. 16-19

  10. 0 &  decay and oscillations APS 0 study : hep-ph/0412300 • P(l -> k) = sin22 sin2[1.27m2ij(eV2)L(km)/E(GeV)] •  decay : me = [ i |Uei|2mi2]1/2 • 0nbb decay : m = |i Uei2 mi eii | Workshop for Underground Experiment and Astroparticle Physics, Muju, 2005. 2. 16-19

  11. Oscillation parametersSK,K2K,SNO,KamLAND,CHOOZ +0.6 •  m221 = 8.2 £ 10-5 eV2 12 = 32.3o • | m232| = 2.0 £ 10-3 eV2 sin2223 > 0.94 • sin2213 < 0.11 -0.5 +2.7 -2.4 +0.6 -0.4 NH: m232 > 0 (m3 > m2 > m1) IH: m232 < 0 (m2 > m1 > m3) QD: m0¼ m3,2,1 Workshop for Underground Experiment and Astroparticle Physics, Muju, 2005. 2. 16-19

  12. Ranges of m • NH: m = |[ m2S]1/2 s122 c232 +[ m2A ]1/2 s132 e-i2| • IH: m = [ m2A]1/2 c132 £[1-4s122c122 sin2(2-1)/2]1/2 • QD: m=m0 |(c122ei1+s122ei2)c132 +s132| Workshop for Underground Experiment and Astroparticle Physics, Muju, 2005. 2. 16-19

  13. Ranges of m Workshop for Underground Experiment and Astroparticle Physics, Muju, 2005. 2. 16-19

  14. 0 and nuclear structure • Decay rate of (A, Z) -> (A, Z+2) e+ e+ : 1/T01/2(A,Z) = G0(E0,Z) | M0GT– (gV2/gA2) M0F |2 m2 • Heidelberg-Moscow 76Ge experiment : T01/2 > 1.9 1025 yrs !m < 0.55 eV Workshop for Underground Experiment and Astroparticle Physics, Muju, 2005. 2. 16-19

  15. Nuclear structure issues • Quasiparticle Random Phase Approximation (10%?) • Shell Model • Constraining with other observables • Reducing the uncertainty (factor 2-3 presently) : Workshop for Underground Experiment and Astroparticle Physics, Muju, 2005. 2. 16-19

  16. Future prospectsBilenky et.al., hep-ph/0402250 Workshop for Underground Experiment and Astroparticle Physics, Muju, 2005. 2. 16-19

  17. (note) Beta decay : me < 0.2 eV at KATRIN Workshop for Underground Experiment and Astroparticle Physics, Muju, 2005. 2. 16-19

  18. Conclusionshep-ph/0412300 Workshop for Underground Experiment and Astroparticle Physics, Muju, 2005. 2. 16-19

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