Summary of atmospheric and long baseline
neutrinos at Neutrino 08 in Christchurch, NZ
MINOS, Super Kamiokande, MiniBooNE, OPERA

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Motivation
NuMI beam and MINOS detector
Analysis of charged current events
Analysis of neutral current events
e appearance search
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3 times more POT

NEW

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(2006 publication)

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CC Event selection

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!

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Data
MC (NC)BG(CC)

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Do the same thing with FD.
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NEW

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NEW

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Near Detector

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At CHOOZ limit expect 12 e signal events and42 BG
events with 3.25x1020 protons
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Conclusion & Future
New measurement of the atmospheric neutrino oscillation parametersfor 3.36x1020 POT:
From an analysis of CC events, decay and decoherence aredisfavored at 3.7 and 5.7, respectively.
From an analysis of NC events in the FD for an exposure of 2.46x1020
POT, the fraction of NC events that disappear is less than 0.17 at90%C.L.
First results on e appearance are expected later this year and havesensitivity below the Chooz limit. Other ND­only results expected later
this year also.

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This talk

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In this talk :Coming update : SK­IV
SK­III status

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Analysis updates : SK­Iand SK­II30

SK­IV : DAQ Upgrade
Simplified detector operations
Unified readout scheme for ID and OD

Increased reliability/performance
Improve multiple energy resolution
Wider dynamic range

Improve multiple­hit capability
Efficient ID of m­decay electrons

Ethernet­based readout
Increased bandwidth and reduced dead time

New DAQ readout system
No hardware trigger : instead record all hits and apply software triggers

SK­IV installation begins Aug 2008 : to be completed mid Sep.
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6 months commissioning period
before T2K beam31

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2 fit in bins of zenith angle
with systematic error pull terms

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Updated : changes and improvements

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Updated

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Updated

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Updated

MINOS
5.7
3.7

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Updated

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Comparison between SK and Minos
SKI + SKII

Minos

Minos 90%CL by hand

Minos

SK 90%CL

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Conclusion and Future

T2K beam on Apr 2009

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MiniBooNE Oscillation searches
Motivation
After LSND

Detector
Oscillation analysis
Global data analysis

Low Energy e candidate excess
Events from NuMI beamline
Anti­neutrino appearance at MiniBooNE

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Oscillation status after LSND

8GeVWith an oscillation probability of(0.264  0.067 0.045)%.
3.8  significance for excess.
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Oscillation status after LSND

This signal looks very different fromother experiments.
Much higher m2=0.1~10 eV2Much smaller mixing angle

8GeV

Only 1 experiment

Needed more than 3 'sModels developed with 1or more sterile 's orother new physics
models
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8GeV

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Gray: LSND at 90%C.L.
Brown:
at 99%C.L.

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Global data analysis
Combine results from several experiments : LSND, KARMEN2,
MiniBooNE, Bugey

Compatibility
How probably is it that all experimental results come from the sameunderlying 2­ oscillation hypothesis?
 2 =  2exp1 +  2exp2 +  2exp3 + ...
Robust search

Allowed regions
Indicate where oscillation parameters would lie, at a given CL, assuming all
experiments results can arise in a framework of 2­ osc.
The compatibility is the metric for the validity of this assumption.
Method : M.Maltoni, T. Schwetz, Phys. Rev. D 68, 033020(2003).
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New
Combination of e appearance
searches (non-reactor)

LSND,KAR2,MB

25.36% compatible withhaving come from 2­ oscBest fit point is excluded
area by Bugey.

Combination of all
There is no more than
3.94% compatible(chance) with having
resulted from 2­ osc.

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LSND,MB,
KAR2,Bugey

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Extends the analysis to lower energies

Data­MC
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Updates to low Energy e cut
Removing BG from neutrino
interactions in the dirt outside
the tank

Adding this cut and photonuclear
absorption of 0 production intoMC
Clearly, more evidence is needed
to quantify/verify the excess...
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Conclusion and Future
No evidence for e appearance in the analysis region
Global fits with other experiments
Update of low E e candidates

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Oscillation Project with Emulsion tRacking Apparatus
Motivation
Provide a direct evidence of   oscillation look for  appearance ina pure  beam

Tau identification
~0.6mmNeed Large target mass, high spacialresolution, lepton IDc~0.6mm
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OPERA detector overall
Total target mass : 1.35 kton

 ID : magnetic spectrometer1.55To▪

Data taking
DAQ at Gran Sasso target and tracker : target tracker

Emulsion scanning at EU &JapanEmulsion Cloud Chamber bricks & scintillator strips
A ECC brick has
57 Emulsion films
56 Pb sheets(1mm thick)
6/27/2008~154,000 ECC bricks in total

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First beam induced event

Neutrino events in OPERA

2007 “appetizer” run : very short
36 out of 38 events with good CS tagging
Wall finding, brick finding : OK
TT to CS position accuracy : ~ 3 cm

First event recorded in the OPERA target : Oct 2, 2007

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Future : sensitivity to  searchFirst 6/27/2008

event expected in 1­2 yr

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Conclusion and Future
Detector is about to fully installed
First beam related event has been observed last OctoberFirst  event is expected to be observed in 1­2 yr

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Grand Conclusion

Upside down Moon

MINOS
CC : atmospheric  osc, decay and decoherence are disfavoredNC : haven't seen significant disappearance

SKSKI+II analysis, SKIII result is coming soon, SKIV upgrade is on going

MiniBooNEe appearance search ­­­ combined analysis & low E

OPERA
Detector is almost fully installed. Will see first  in 1­2 yr.
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Supplements

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Comparison between SK and Minos

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Slide from Zelimir Djurcic's talk at PPC 2008
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