relation of reactor q 13 to long-baseline superbeam experiments
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Relation of Reactor 13 to Long-baseline Superbeam
Experiments
R. D. McKeownCaltech
Outline
• Overview• Reactor disappearance• Superbeam experiments• New comparison plots• Conclusions and Observations
Maki – Nakagawa – Sakata Matrix
Future Studies!
CP violation
Goals for the future
• Establish 13 non-zero
• Measure CP violation
• Determine mass hierarchy
(2003)
Distance (m)
P(ee)
Pee 1 cos4 13 1 sin212 sin2 m122L
4E
Dominant 12 Oscillation
Pee 1 sin2 213 sin2 m312L
4E
m21
2L
4E
cos4 13 sin2 212
Subdominant 13 Oscillation
e Disappearance
Reactor Experiment Sensitivity(Huber et al.,)
Three Classes of Proposals
1. sin2213 ~ 0.03 (e.g., CHOOZ II)
2. sin2213 ~ 0.01 (US approach?)
3. sin2213 << 0.01 (??)
Reactor Experiment Sensitivity
1
23
e Appearance
CP violation
matter
T2K- From Tokai To Kamioka
Mass hierarchy (+/-)
“Minakata” Plots
m2=3x10-3 eV2
Huber et al., comparison
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= 1270m2=2x10-3 eV2 L/E=394)
Run scenario: 5yr – then
+/- 0.03
cp
T2K
— normal— inverted
m2=2x10-3 eV2
5 years
+/- 0.01reactor
m2=2x10-3 eV2
+/- 0.05
NUMI (FNAL-Soudan)
m2=2x10-3 eV2
5 years
NUMI (FNAL-Soudan)
+/- 0.01reactor
m2=2x10-3 eV2
m2=3x10-3 eV2
m2=2x10-3 eV2
BNL-NUSL
CONCLUSIONS
• Reactor measurement with sin2213 ~ 0.01can provide significant new constraintswhen combined with 5yr superbeam result – perhaps even decide hierarchy
• L/E for superbeam expt seems critical
• Coordination appears beneficial
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