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1/12
Will T2KK see new physics?
Hiroaki Sugiyama
Ref: N. Kitazawa, HS, and O. Yasuda, hep-ph/0606013
(Theory group, KEK)
2/12
IntroductionIntroduction
Future oscillation experiments search for tiny effects of
high-precision measurements of oscillation probabilities
Are they sensitive to also new physics?
non-standard interaction with source
non-standard interaction with matter
non-standard interaction with detector
We consider only non-standard matter effect in model-independent way
unitarity violation near detector
3/12
: matter density
Non-standard matter effectNon-standard matter effect
Hamiltonian in flavor basis
4/12
Low energy(ex. reactor)
High energy(ex. neutrino factory)
Medium energy(ex. T2KK)
vacuum osc.
large non-standard effect
vacuum osc. is suppressed
pure measurement of oscillation parameters
significant effects?
(in far future)
5/12
S. Davidson et al., JHEP 0303, 011 (2003) A. Friedland et al., Phys. Rev. D72, 053009 (2005)
Constraint on Constraint on
NO! (from model-independent viewpoint)
ex.: dim-8 op. with higgs
indep.
constraint by experiments with neutrinos
no phases for simplicity
large effect in T2KK? is allowed!!
is bounded stringently by experiments with charged leptons??
6/12
SetupSetup
three epsilons that can be
parameters are fixed
no phases
probabilities are obtained numerically
for
perturbation with respect to is not reliable
(others are zero)
7/12
Oscillation probabilities with Oscillation probabilities with
(off-axis)Probs. with have similar size to standard prob. with
T2K can not give clear evidence for non-standard effects
How about T2KK?
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(a)(g)
(h)
Prob. with can be much larger than standard prob..
is important in this energy range
clear evidence
at a detector in Korearegion for off-axis beam
11/12
T2KK(1000km) vs. MINOS(735km)T2KK(1000km) vs. MINOS(735km)
Non-standard effect in T2KK is larger than that in MINOS
Korean detector can be placed for off-axis beam
Even if MINOS does not see (see) the effect, there is a chance for T2KK to see (improve) that.
ongoing exp.
better sensitivity
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ConclusionConclusion
In T2KK, can give large probability that can not be explained by the standard one with
Even after MINOS (735km), T2KK can give new information on non-standard interactions.
Constraint with atm. and K2KConstraint with atm. and K2KA. Friedland et al., Phys. Rev. D72, 053009 (2005)
We can read off
true values
measured value
Silver channel in neutrino factory(3000km)Silver channel in neutrino factory(3000km)
huge enhancement!
is possible!
(g)
(i)