Relation of Reactor q13 to Longbaseline Superbeam Experiments

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

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

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Maki Nakagawa Sakata Matrix
Future Studies!
CP violation
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Goals for the future

• Establish q13 non-zero
• Measure CP violation
• Determine mass hierarchy

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(2003)
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ne Disappearance
Dominant ?12 Oscillation
P(?e??e)
Distance (m)
Subdominant ?13 Oscillation
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Reactor Experiment Sensitivity(Huber et al.,)
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Three Classes of Proposals

• sin22q13 0.03 (e.g., CHOOZ II)
• sin22q13 0.01 (US approach?)
• sin22q13 ltlt 0.01 (??)

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Reactor Experiment Sensitivity
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3
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ne Appearance
T2K- From Tokai To Kamioka
CP violation
matter
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Minakata Plots
Dm23x10-3 eV2
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Huber et al., comparison
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Superbeam Proposals

• T2K (JPARC-SK, 2009 start)
• E0.7 GeV, L295km, L/E421
• NUMI (FNAL-Soudan)
• E1.5 GeV, L732km, L/E488
• BNL-NUSL
• E2.0 GeV, L2540km, L/E 1270

(Dm22x10-3 eV2 g L/E394)
Run scenario 5yr n then n
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T2K

• normal
• inverted

dcp
5 years
/- 0.03
Dm22x10-3 eV2
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/- 0.01 reactor
Dm22x10-3 eV2
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NUMI (FNAL-Soudan)
5 years
/- 0.05
Dm22x10-3 eV2
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NUMI (FNAL-Soudan)
/- 0.01 reactor
Dm22x10-3 eV2
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Dm23x10-3 eV2
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Dm22x10-3 eV2
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BNL-NUSL
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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