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Relation of Reactor q 13 to Long-baseline Superbeam Experiments

Relation of Reactor q 13 to Long-baseline Superbeam Experiments. R. D. McKeown Caltech. Outline. Overview Reactor n disappearance Superbeam experiments New comparison plots Conclusions and Observations. Maki – Nakagawa – Sakata Matrix. Future Studies!. CP violation.

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Relation of Reactor q 13 to Long-baseline Superbeam Experiments

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  1. Relation of Reactor q13 to Long-baseline Superbeam Experiments R. D. McKeown Caltech

  2. Outline • Overview • Reactor n disappearance • Superbeam experiments • New comparison plots • Conclusions and Observations

  3. Maki – Nakagawa – Sakata Matrix Future Studies! CP violation

  4. Goals for the future • Establish q13 non-zero • Measure CP violation • Determine mass hierarchy

  5. (2003)

  6. ne Disappearance Dominant 12Oscillation P(ee) Distance (m) Subdominant 13Oscillation

  7. Reactor Experiment Sensitivity(Huber et al.,)

  8. Three Classes of Proposals • sin22q13 ~ 0.03 (e.g., CHOOZ II) • sin22q13 ~ 0.01 (US approach?) • sin22q13 << 0.01 (??)

  9. Reactor Experiment Sensitivity 1 2 3

  10. Mass hierarchy (+/-) ne Appearance T2K- From Tokai To Kamioka CP violation matter

  11. “Minakata” Plots Dm2=3x10-3 eV2

  12. Huber et al., comparison

  13. Superbeam “Proposals” • T2K (JPARC-SK, 2009 start) E=0.7 GeV, L=295km, L/E=421 • NUMI (FNAL-Soudan) E=1.5 GeV, L=732km, L/E=488 • BNL-NUSL E=2.0 GeV, L=2540km, L/E= 1270 (Dm2=2x10-3 eV2g L/E=394) Run scenario: 5yr n – then n

  14. T2K • normal • inverted dcp 5 years +/- 0.03 Dm2=2x10-3 eV2

  15. +/- 0.01 reactor Dm2=2x10-3 eV2

  16. NUMI (FNAL-Soudan) 5 years +/- 0.05 Dm2=2x10-3 eV2

  17. NUMI (FNAL-Soudan) +/- 0.01 reactor Dm2=2x10-3 eV2

  18. Dm2=3x10-3 eV2

  19. Dm2=2x10-3 eV2

  20. BNL-NUSL

  21. CONCLUSIONS • Reactor measurement with sin22q13 ~ 0.01 • can provide significant new constraints • when combined with 5yr superbeam • result – perhaps even decide hierarchy • L/E for superbeam expt seems critical • Coordination appears beneficial

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