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High g Li/B b -Beam

High g Li/B b -Beam. Enrique Fernández-Martínez, MPI für Physik Munich Based on a collaboration with: P. Coloma, A. Donini and J. López-Pavón. The oscillation parameters. 3s. What we already know Solar sector Atm sector What we still don’t know q 13 < 12.9º d cp Mass hierarchy

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High g Li/B b -Beam

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  1. High g Li/B b-Beam Enrique Fernández-Martínez, MPI für Physik Munich Based on a collaboration with: P. Coloma, A. Donini and J. López-Pavón

  2. The oscillation parameters 3s • What we already know • Solar sector • Atm sector • What we still don’t know • q13< 12.9º • dcp • Mass hierarchy • Octant ofq23 M.C. González-García and M. MaltoniarXiv:0704.1800 3s

  3. bBeam g  100 P. Zucchellihep-ph/0107006

  4. bBeam + g  350 J. Burguet-Castell et al.hep-ph/0312068 J. Burguet-Castell et al.hep-ph/0503021

  5. bBeam Li/B Ionization Cooling g  100 Donini and E. F-M hep-ph/0603261 C. Rubbiahep-ph/0609235 C. Rubbia et al. hep-ph/0602032

  6. bBeam Li/B Ionization Cooling + g  350 S. K. Agarwallaet al.hep-ph/0610333 S. K. Agarwallaet al.hep-ph/0611233 S. K. Agarwalla et al. arXiv:0711.1459 C. Rubbia et al. hep-ph/0602032

  7. (_) (_) D 2 m D = ~ 12 = q q q q J cos sin 2 sin 2 sin 2 sol 2 E 13 13 12 23 D D æ ö 2 L m @ D = ç ÷ sol 0 . 05 23 atm 2 2 E è ø The Golden channel in matter Resonantenhancement whenwith E  6GeV Magic Baseline 7000Km Expanded in sin 2q13 < 0.4 where A. Cervera et al.hep-ph/0002108

  8. The baselines q13 = 5º d = 0, 90, -90º 7000km InvertedHierarchy 7000km Normal Hierarchy Resonant enhancement depending on the hierarchy

  9. Sensitivity to the mass hierarchy S. K. Agarwalla et al. arXiv:0711.1459 Sensitivity to the mass hierarchy down to sin2 2q13 = 10-3 for g = 350

  10. The baselines 2000km Normal Hierarchy 2000km InvertedHierarchy q13 = 5º d = 0, 90, -90º 7000km InvertedHierarchy 7000km Normal Hierarchy

  11. bBeam Li/B Ionization Cooling + C.Rubbia et al. hep-ph/0602032 g  350

  12. B And Lib-Beam fluxes We consider 3 different fluxes “Nominal” 2·1018 decays/year “Medium” 5·1018 decays/year “Ultimate” 10·1018 decays/year “Ultimate” flux at 2000km

  13. The Detector 50kt MagnetizedIronNeutrinoDetector:MIND We consider 9 bins of 1 GeVbetween 1.5-10.5 GeV 65% signal efficiency 10-4or 10-5backgrounds 2.5% and 5% or 10% and 20% systematics in signal and background Atmospheric background negligible a this energies with bunching CC charm  10-4-10-5 signal eff 0.7 CC no-charm  10-4-10-5 NC  10-4-10-5 ISS Detector WorkingGroup arXiv:0712.4129 

  14. Degeneracies at 2000km CP discovery potential signdegeneracy true solution Nominal, MediumandUltimatefluxes Loss of sensitivitytoCP violationand themasshierarchy at the 2000km baselineduetothesigndegeneracy

  15. Combining the two baselines 2000km + 7000km 2000km Nominal, MediumandUltimatefluxes Thesigndegeneracyissolved at the 7000km baseline

  16. CP discovery potential 2000km + 7000km ISS PhysicsWorkingGroup arXiv:0710.4947  Nominal, MediumandUltimatefluxes TheCP discoverypotentialwiththeUltimate and Medium flux betweenlow and highg b-Beam

  17. q13 discovery potential 2000km + 7000km ISS PhysicsWorkingGroup arXiv:0710.4947  Nominal, MediumandUltimatefluxes TheUltimateflux similar tohighg b-Beam TheMedium flux betweenlow and highg b-Beam TheNominal flux similar toSuper-Beams

  18. Sensitivity to the mass hierarchy 2000km + 7000km ISS PhysicsWorkingGroup arXiv:0710.4947  Nominal, MediumandUltimatefluxes AllthefluxesworsethantheoptimumNF butbetterthantheotherfacilities

  19. Systematics and Backgrounds Effect of Systematycs Effect of Background 2.5/5% and 10/20%systematic error considered 10-5and 10-4backgroundconsidered Impact of the background and the systematic errors very small Performance limited by statistics No improvement if background is lowered below 10-5

  20. Conclusions • Strong complementarity between the two baselines • 2000km detector very sensitive to d but spoiled by sign degeneracies • 7000km detector resonant dependence on the mass hierarchy and no dependence on d solves degeneracies • With Medium flux sensitivity to q13, dand the mass hierarchy down to sin2 2q13 3·10-4 • Impact of the background and the systematic errors very small. Performance limited by statistics

  21. The ionization cooling procedure C.Rubbia et al. hep-ph/0602032 • 7Li + D →8Li + p • 6Li + 3He →8B + n An excess of 1014 ions/s could be accumulated

  22. Event Rates For 10yr exposure of each beam to a 50kt iron detector sin2 2q13= 0.01

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