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Will T2KK see new physics?

Hiroaki Sugiyama

Ref: N. Kitazawa, HS, and O. Yasuda, hep-ph/0606013

(Theory group, KEK)

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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

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: matter density

Non-standard matter effectNon-standard matter effect

Hamiltonian in flavor basis

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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)

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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??

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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)

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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

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gives the difference between probs. for and

(i)(g) (g) (i)

Difference between and

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(g)

(i)

(a)

and are also important in this energy range

higher energy region (on-axis beam)

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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.

Backup

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)

Two-flavor caseTwo-flavor caseex. silver channel in neutrino factory