KEK PH 2017

S.
Cao
IPNS,
KEK
Results
and
Prospects
from
T2K

2/17/17 KEK-‐PH2017
Ø Neutrino
Oscillation
landscape
Ø T2K
&
recent
results
Ø Future
prospects

Brief
neutrino
history
2/17/17 KEK-‐PH2017 2
Credit
to
APS
² 1930:
On-‐paper
appearance
as
“desperate”
remedy
by
W.
Pauli
² 1956:

first
experimentally
discovered
by
Reines
and
Cowan
² 1962:

existence
confirmed
by
Lederman
et
al.

² 1998:
Atmospheric
neutrino
oscillations
discovered
by
Super-‐K
² 2000:

first
evidence
reported
by
DONUT
experiment
² 2001:
Solar
neutrino
oscillations
detected
by
SNO
(KamLAND
2002)
² 2011:

transitions
observed
by
OPERA
² 2011-‐13:

by
T2K,

by
Daya Bay(2012)

² 2015:
Nobel
prizes
for
𝜈 oscillations,
Breakthrough
prize
(2016)
¯⌫e
⌫µ
⌫⌧
⌫µ ! ⌫⌧
⌫µ ! ⌫e ¯⌫e ! ¯⌫e
2015
T2K
observe
𝜈 𝜇 à𝜈e
appearance
Nobel & Breakthrough
for
𝜈 oscillations

2/17/17 KEK-‐PH2017 3
"for
the
discovery
of
neutrino
oscillations,

which
shows
that
neutrinos
have
mass"

Standard
Model
&
neutrino
oscillations
32/17/17 KEK-‐PH2017
Source:
AAAS
0
@
⌫e
⌫µ
⌫⌧
1
A =
0
@
1 0 0
0 c23 s23
0 s23 c23
1
A
0
@
c12 s12 0
s12 c12 0
0 0 1
1
A
0
@
c13 0 s13e i CP
0 1 0
s13ei CP
0 c13
1
A
0
@
⌫1
⌫2
⌫3
1
APontecorvo
(1957)
Maki,
Nakagawa
Sakata
(1962)
Majorana
(1937)
Standard
Model:
² Neutrinos
interact
through
the
weak

interaction
² Lepton
flavor
is
strictly
conserved
² Neutrinos
have
zero
mass
Neutrino
oscillations:
² Indicate
massive
neutrinos
² Mix
flavor
and
mass
eigenstates
² Beyond
Standard
Model
Flavor
eigenstates Mass
eigenstates
The
only
lab-‐based
evidence

Standard
Model
&
neutrino
oscillations
Standard
Model:
² Neutrinos
interact
through
the
weak

interaction
² Lepton
flavor
is
strictly
conserved
² Neutrinos
have
zero
mass
Neutrino
oscillations:
² Indicate
massive
neutrinos
² Mix
flavor
and
mass
eigenstates
² Beyond
Standard
Model
42/17/17 KEK-‐PH2017
Reactors
/
acceleratorSolar /
reactors
0
@
⌫e
⌫µ
⌫⌧
1
A =
0
@
1 0 0
0 c23 s23
0 s23 c23
1
A
0
@
c12 s12 0
s12 c12 0
0 0 1
1
A
0
@
c13 0 s13e i CP
0 1 0
s13ei CP
0 c13
1
A
0
@
⌫1
⌫2
⌫3
1
A
Source:
AAAS
cij = cos ✓ij, sij = sin ✓ij
Atmospherics
/
Accelerators

Neutrino
oscillation
landscape

2/17/17 KEK-‐PH2017 6
Gonzalez-‐Garcia et
al.,
arXiv:1512.06856

⌫e ⌫µ ⌫⌧
Normal
hierarchy Inverted
hierarchy
m2
lightest m2
lightest
0
@
⌫e
⌫µ
⌫⌧
1
A =
0
@
1 0 0
0 c23 s23
0 s23 c23
1
A
0
@
c12 s12 0
s12 c12 0
0 0 1
1
A
0
@
c13 0 s13e i CP
0 1 0
s13ei CP
0 c13
1
A
0
@
⌫1
⌫2
⌫3
1
A
sign( m2
32) = ?
✓23 is maximal ?
CP = ?
mlightest = ?
m2
32
m2
31
m2
21
m2
21
⌫1
⌫2
⌫3
⌫1
⌫2
⌫3
m2
21 = 7.50+0.19
0.17 ⇥ 10 5
eV2
m2
31 = 2.457+0.047
0.047 ⇥ 10 3
eV2
✓13 = 8.50+0.20
0.21( )
✓12 = 33.48+0.78
0.75( )
✓23 = 42.3+3.0
1.6( )
m2
ij = m2
⌫i
m2
⌫j
Global
fit
– Normal
hierarchy

Opening
questions
(1)
2/17/17 KEK-‐PH2017 7
Credit
to
H.
Murayama
q How
do
neutrinos
get
mass?

q Why
are
their
masses
so
small?

Opening
questions
(2)
2/17/17 KEK-‐PH2017 8
arXiv:1212.6374
q Why
does
PMNS
matrix
differ
from
CKM
matrix?
*Area
of
the
squares
represents
square
of
matrix
elements

Opening
questions
(3)
2/17/17 KEK-‐PH2017 9
q What
is
neutrino’s
role
in
Universe
evolution?
q Where
is
anti-‐matter?
Credit: NASA/WMAP Science Team
Source: scienceabc.com

Opening
questions
(3-‐cont’d)
2/17/17 KEK-‐PH2017 10
q Can
it
be
due
to
CP-‐violating
decays
of
heavy
neutrinos?
1,000,000,001
Baryons
1,000,000,001
Anti-‐Baryons
1,000,000,002
Baryons
1,000,000,000
Anti-‐Baryons
Begin
of
Universe Shortly
after
?
CP-‐violating
decays
(B
=
0;
L
≠
0)
Sphaleron
Process
(B
≠ 0;
L
≠
0)(Fukugita,
Yanagida)

Opening
questions
(3-‐cont’d)
2/17/17 KEK-‐PH2017 11
Credit
to
B.
Kayser
q CP-‐violating
phase
in
heavy
neutrino
decays
leads
to
CP-‐
violating
phase
in
the
light
neutrino
mixing
Measure
CP
violation
phase
in
neutrino

mixing
via
neutrino
oscillations
wanted!!!

𝜈 oscillation
measurement
2/17/17 KEK-‐PH2017 12
It’s
about
probability
measurement,
basic
needs:
ü Source
of
well-‐understood
neutrino
flavor
composition
ü Detector
at
optimal
baseline,
enable
to
distinguish
flavors
ü Neutrino
energy
is
necessary
to
known
Defined
baseline
𝜈 source
𝜈 detector
Theoretical,

simple

𝜈 oscillation
measurement
(cont’d)
2/17/17 KEK-‐PH2017 13
It’s
about
probability
measurement,
basic
needs:
ü Source
of
well-‐understood
neutrino
flavor
composition
q Neutrino
weak
interactionà powerful
source
q Flux
uncertainty

ü Detector
at
optimal
baseline,
enable
to
distinguish
flavors
q Uncertainty
in
neutrino-‐nuclei
interactionà interaction
uncertainty
q Response
is
not
perfect,
misidentify
flavor
à detector
uncertainty
ü Neutrino
energy
is
necessary
to
known
q Typically
not
mono-‐energy
neutrino
source
q Can
bias
in
reconstructing
neutrino
energy

Defined
baseline
𝜈 source
𝜈 detector
Experimental,

NOT
simple

T2K
experiment
2/17/17 KEK-‐PH2017

T2K
experiment
2/17/17 15KEK-‐PH2017
² Long-‐baseline
neutrino
experiment,
located
in
Japan
² Large
collaboration:
~470
physicists
from
63
institutes/
11
nations
² Rich
programs:
standard
neutrino
oscillations,
non-‐standard
physics

search,
neutrino
interactions

J-‐PARC
neutrino
beam
line
2/17/17
² High
intensity,
almost
pure
muon (anti)
neutrino
beam
from
J-‐PARC
16KEK-‐PH2017
² 30
GeV p
extracted
from
J-‐PARC
main
ring,
impinge
on
90-‐cm,

graphite
target

² Induced
𝜋+ (𝜋-‐)
focused
by
three
horns,
pass
through
a
96-‐m
decay
pipe
² Beam
dump
to
stop
all
particles
except
neutrinos
and
high-‐energy
muons
² Muon monitor,
downstream
of
beam
dump,
to
monitor
beam
intensity
and
direction
by

measuring
induced
muon profile.
1.9 ⇥ int

Beam
power
and
data
accumulation
2/17/17 KEK-‐PH2017 17
Maximumbeampowerachievedsofar459.6kW
23 January 2010 - 19 January 2017
POT total: 18.29×"#$#
% mode POT: 10.68×"#$# (58%)
%& mode POT: 7.62×"#$# (42%)
² Beam
power
steadily
increased
to
470
kW
recently!
² 1.8x1021 Protons-‐on-‐target
(POT)
delivered
until
Jan
19th.

Data
sample
for
results
presented
today:
² Neutrino-‐mode:
7.48x1020 POT
² Antineutrino-‐mode:
7.47x1020
POT

Today
result

Neutrino
flux
inference
2/17/17
² High
intensity,
almost
pure
muon (anti)
neutrino
beam
from
J-‐PARC
18KEK-‐PH2017
² To
infer
neutrino
flux,
knowledge

of
hadron
production
at
target

needed
² Constrained
by
external
data
from

NA61/SHINE
Flux
uncertainty
~
10%
(absolute
error)
𝜈̅ mode
< 1%(⌫e/⌫e) < 1%(⌫e/⌫e)
T2K
Far
Detector
T2K
Far
Detector

T2K
Far
Detector
T2K
Far
Detector

(Beam
modes
changed
by
switching
horn
polarity)
~3.7%
effect
to
analysis
w/
Near
Detector
constraint
𝝂-‐mode
𝝂-‐mode 𝜈̅ mode

Far
Detector,
Super-‐Kamiokande
2/17/17 KEK-‐PH2017 19
(GeV)νE
0 1 2 3
(A.U.)295km
µνΦ
0
0.5
1 °OA 0.0
°OA 2.0
°OA 2.5
0 1 2 3
)eν→µνP(
0.05
0.1
= 0CP
δNH, = 0CP
δIH,
/2π=CP
δNH, /2π=CP
δIH,
0 1 2 3
)µν→µνP(
0.5
1
= 1.023θ22
sin
= 0.113θ22
sin
2
eV-3
10×= 2.432
2
m∆
Partice ID parameter
-10 -8 -6 -4 -2 0 2 4 6 8 10
0
50
100
150
200
250
300
350
Super Kamiokande IV 2166.5 days : Monitoring
e-like muon-like
Numberofevents
² Muon and
electron
are
well-‐separated
à identify
𝜈 𝜇/𝜈& with
high
purity
² Super-‐K
is
2.50 off
the
beam’s
axis
to
achieve
narrow
band
beam
peaked

at
oscillation
maximum
(0.6
GeV)
(atmospheric
𝜈 data)
Super-‐Kamiokande
(41.4
m
tall
x
39.3m
diameter)
22.5
ktons fiducial volume

1000m
underground
⌫µ + n ! µ + p
⌫e + n ! e + p
2.5

Far
Detector,
Super-‐Kamiokande
2/17/17 KEK-‐PH2017 20
² Super-‐K
is
2.50 off
the
beam’s
axis
to
achieve
narrow
band
beam
peaked

at
oscillation
maximum
(0.6
GeV)
⌫µ + n ! µ + p
⌫e + n ! e + p
2.5
Short
version Disappearance
channel
Appearance
channel

T2K
primary
physics
goals
2/17/17 KEK-‐PH2017 21
⌫µ + n ! µ + p
⌫e + n ! e + p
Disappearance
channel
(GeV)νE
0.5 1 1.5 2 2.5 3
Osc.Prob
0
0.5
1
flux
µ
νOff-axis°2.5
=0.523θ2
, sin2
eV
-3
=2.5x1032
2
m∆
µν→µν=µν→µν
q Sensitive
to
𝜃23 and
𝛥m2
31
(atmospheric
sector)

à Precision
measurement
( 𝜃23 is
maximal?)
q CPT
symmetry
test
by
comparing
disappearance

in
muon neutrinos
and
muon anti-‐neutrinos

T2K
primary
physics
goals
2/17/17 KEK-‐PH2017 22
⌫µ + n ! µ + p
⌫e + n ! e + p
Appearance
channel
(GeV)νE
0.5 1 1.5 2 2.5 3
Osc.Prob
0
0.02
0.04
0.06
0.08
0.1
flux
µ
νOff-axis°2.5
ν, NH,°=0cpδ
ν, NH,°=270cpδ
ν, NH,°=0cpδ
ν, NH,°=270cpδ
eν→µν,eν→µν
q Sensitive
to
𝜃13 and
𝛿CP
o Degeneracy
𝜃13 -‐ 𝛿CP is
difficult
to
disentangle
with

long
baseline
experiment
à Need
constraint
from

reactor
measurement
on
𝜃13
(or
high
statistics)
q 20-‐30%
effect
of
𝛿CP and
10%
effect
of
mass
hierarchy

(not
too
long
baseline
295km)
Large
CP
effect
Small
matter
effect

(in
vacuum)
(in
matter)

Far
Detector:
Event
selections
2/17/17 KEK-‐PH2017 23
⌫e + n ! e + p
Energy
info.
needed
à Enrich
charged
current
quasi
elastic
events
FCFV 1-ring -likeµ µ
p Decay-e
Numberofevents
0
200
400
RUN1-7 data
)POT
20
10×(7.482
CC QEµν
CC QEµν
CC non-QEµν+µν
CCeν+eν
NC
FCFV
1-ring
e-like
Evis
Decay-e
rec
ν
E fiTQun
Numberofevents
0
200
400
RUN1-7 data
)POT
20
10×(7.482
CCeνOsc.
CCeνOsc.
CCµν/µν
CCeν/eνBeam
NC
Charged particle should be µ±
Pµ > 200 Mev/c: remove ⇡ and e
Decay e < 2: reject invisible ⇡
• FCFV:
Fully
contained
in
fiducial volume
• 1-‐ring:
One
charged-‐particle
for
CCQE
Charged particle should be e±
No decay e : # invisible µ/⇡
Evis > 100 MeV: # low E bkg.
Erec
⌫ < 1.25 GeV: # intrinsic beam ⌫e.
“ﬁTQun”: # NC ⇡0
CCQE-‐enhanced
CCQE-‐enhanced

◎
◎
◎
◎
◎
◎
◎
◎

Far
Detector:
Event
selections
2/17/17 KEK-‐PH2017 24
⌫e + n ! e + p
Energy
info.
needed
à Enrich
charged
current
quasi
elastic
events
FCFV 1-ring -likeµ µ
p Decay-e
Numberofevents
0
200
400
RUN1-7 data
)POT
20
10×(7.482
CC QEµν
CC QEµν
CC non-QEµν+µν
CCeν+eν
NC
FCFV
1-ring
e-like
Evis
Decay-e
rec
ν
E fiTQun
Numberofevents
0
200
400
RUN1-7 data
)POT
20
10×(7.482
CCeνOsc.
CCeνOsc.
CCµν/µν
CCeν/eνBeam
NC
CCQE-‐enhanced
CCQE-‐enhanced

Theoretically,
neutrino
beam
from
J-‐PARC

and
Super-‐Kamiokande are
enough.

However,
experimentally,
we
need
more..
2/17/17 KEK-‐PH2017

Near
Detectors
2/17/17 KEK-‐PH2017 26
² Near
Detector
complex
is
280m
downstream
of
target
It’s
about
probability
measurement,
basic
needs:
ü Source
of
well-‐understood
neutrino
flavor
composition
q Neutrino
weak
interactionà powerful
source
q Flux
uncertainty

ü Detector
at
optimal
baseline,
enable
to
distinguish
flavors
q Uncertainty
in
neutrino-‐nuclei
interactionà interaction
uncertainty
q Response
is
not
perfect,
misidentify
flavor
à detector
uncertainty
ü Neutrino
energy
is
necessary
to
known
q Typically
not
mono-‐energy
neutrino
source
q Can
bias
in
reconstructing
neutrino
energy

Built
for
these
particular
purposes

Near
Detectors
(cont’d)
2/17/17 KEK-‐PH2017 27
² Near
Detector
complex
is
280m
downstream
of
target
On-‐axis
(called
INGRID)
Measure
𝜈 beam
intensity
&
profile:

16
scintillator-‐steel
interleaved

modules
(7.1
tons/each)
Off-‐axis
(called
ND280)
Understand
unoscillated 𝜈 beam:

further
constrain
flux
and
cross-‐
section
parameters

Near
Detectors
measurements
28
Day
[events/1e14POT]
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
Event rate
Horn250kA
Horn205kA
Horn-250kA
[mrad]
1−
0.5−
0
0.5
Horizontal beam direction INGRID
MUMON
Day
[mrad]
1−
0.5−
0
0.5
1
Vertical beam direction INGRID
MUMON
T2K Run1
Jan.2010-Jun.2010
T2K Run2
Nov.2010-Mar.2011
T2K Run3
Mar.2012-Jun.2012
T2K Run4
Oct.2012-May.2013
T2K Run5
May.2014
-Jun.2014
T2K Run6
Oct.2014-June.2015
T2K Run7
Feb.2016-May.2016
2/17/17 KEK-‐PH2017
Measured
data
Off-‐axis
neutrino
energy
strongly

depend
on
beam
direction

(1mrad ~ 2% shift of peak energy)
T2K controlled off-axis better than
1mrad
Position from Designed beam center[cm]
400− 200− 0 200 400
Numberofevents
0
10
20
30
40
50
60
70
80
3
10×
/ ndf2χ 10.8 / 4
Constant 161.1±7.168e+04
Mean 1.099±2.428−
Sigma 1.795±437.6
/ ndf2χ 10.8 / 4
Constant 161.1±7.168e+04
Mean 1.099±2.428−
Sigma 1.795±437.6
Position from Designed beam center[cm]
400− 200− 0 200 400Numberofevents 0
10
20
30
40
50
60
70
80
3
10×
/ ndf2χ 39.29 / 4
Constant 163.3±7.392e+04
Mean 1.158±4.593
Sigma 1.979±456
/ ndf2χ 39.29 / 4
Constant 163.3±7.392e+04
Mean 1.158±4.593
Sigma 1.979±456
Data for each module
Fitted Gaussian
Horizontal Vertical

Near
Detectors
measurements
(cont’d)
2/17/17 KEK-‐PH2017 29
Muon momentum (MeV/c)
0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000
Events/(100MeV/c)
0
500
1000
1500
2000
2500
Data
CCQEν
CC 2p-2hν
πCC Res 1ν
πCC Coh 1ν
CC Otherν
NC modesν
modesν
FGD1,
nu,
CC0pi
0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000
Events/(100MeV/c)
0
50
100
150
200
250
300
350
400
Data
CCQEν
CC 2p-2hν
πCC Res 1ν
πCC Coh 1ν
CC Otherν
NC modesν
modesν
FGD1,
nu,
CC1pi
0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000
Events/(100MeV/c)
0
50
100
150
200
250
Data
CCQEν
CC 2p-2hν
πCC Res 1ν
πCC Coh 1ν
CC Otherν
NC modesν
modesν
FGD1,
nu,
CCres
0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000
Events/(100MeV/c)
0
50
100
150
200
250
Data
CCQEν
non-CCQEν
CCQEν
non-CCQEν
FGD1,
Antinu,
CC1trk
0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000
Events/(100MeV/c)
0
5
10
15
20
25
30
35
40
Data
CCQEν
non-CCQEν
CCQEν
non-CCQEν
FGD1,
Antinu,
CCNtrk
0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000
Events/(100MeV/c)
0
10
20
30
40
50
60
Data
CCQEν
non-CCQEν
CCQEν
non-CCQEν
FGD1,
nu,
CC1trk
0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000
Events/(100MeV/c)
0
5
10
15
20
25
30
35
40
Data
CCQEν
non-CCQEν
CCQEν
non-CCQEν
FGD1,
nu,
CCNtrk

Near
Detectors
measurements
(cont’d)
302/17/17 KEK-‐PH2017
Cross-‐section
parameters
Constrain
𝜈-‐int.
model
(GeV)νE
-1
10 1 10
FluxParameterValue
0.6
0.7
0.8
0.9
1
1.1
1.2
1.3
1.4
Prior to ND280 Constraint
After ND280 Constraint
beam modeν,µνND280
flux
Flux parameters
?
Need
to
know
how

neutrinos
see
nuclei
(parameterization)
Observable
Nuclear
target

Near
Detectors
measurements
(cont’d)
312/17/17 KEK-‐PH2017
Reconstructed Neutrino Energy (GeV)
0 0.2 0.4 0.6 0.8 1 1.2
Eventsperbin
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
error (w/o ND280)σ1±
errorσ1±
0 0.2 0.4 0.6 0.8 1 1.2
Eventsperbin
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
error (w/o ND280)σ1±
errorσ1±
0 0.5 1 1.5 2 2.5
Eventsperbin
0
2
4
6
8
10 error (w/o ND280)σ1±
errorσ1±
0 0.5 1 1.5 2 2.5
Eventsperbin
0
0.5
1
1.5
2
2.5
3
3.5
4 error (w/o ND280)σ1±
errorσ1±
Total
𝛥NSK /NSK
Beam

mode
Sample w/o

ND280
w/
ND280
𝝂 12.0% 5.0%
𝝂 11.9% 5.4%
𝜈̅ 12.5% 5.2%
𝜈̅ 13.7% 6.2%

Quest
for
THEORISTS
(1)
322/17/17 KEK-‐PH2017
To
THEORISTS
(1):
We
need
you
here!
For
better
understand
neutrino-‐nuclei

interactions.
?
Need
to
know
how

neutrinos
see
nuclei
(parameterization)
Observable
Nuclear
target

T2K
Results
2/17/17 KEK-‐PH2017
Disappearance
channel

2/17/17 KEK-‐PH2017
² Oscillation
dip
is
clearly
observed
² Four
physics
parameters
are
fitted:

and

Results:
𝜈* disappearance
0 1 2 3 4 5 6 7 8
Events/100MeV
0
10
20
30
40
50
60
70
80
90
Prediction
Unoscillated
Best-Fit
Data
Reconstructed Energy [GeV]
0 1 2 3 4 5 6 7 8
Ratio
0
0.5
1
1.5
2
2.5
T2K Run1−7c preliminary
0 1 2 3 4 5 6 7 8
Events/100MeV
0
5
10
15
20
25 Prediction
Unoscillated
Best-Fit
Data
0 1 2 3 4 5 6 7 8
Ratio
0
0.5
1
1.5
2
2.5
Neutrino Anti-‐neutrino
Beam
mode Unoscillated pred. Data
Neutrino 521.8 135
Anti-‐neutrino 184.8 66
sin2
✓23, | m2
32| sin2
✓23, | m2
32|
sin2
2✓23
/ | m2
32|
sin2
✓23
/ | m2
32|

2/17/17 KEK-‐PH2017
Neutrino
vs.
Anti-‐neutrino
(T2K
only)
Compare
to
other

experiments
in
the
world
² No
difference
between
muon neutrino
disappearance

and
muon anti-‐neutrino
disappearance
² Good
agreement
w/
antineutrino
data
from
other

experiments
Results:
𝜈* disappearance

T2K
Results
2/17/17 KEK-‐PH2017
Appearance
channel

2/17/17 KEK-‐PH2017
Results:
𝜈&+ appearance
energy (MeV)νReconstructed
0 500 1000
Numberofevents
0
5
10
15
RUN1-7 data
)POT
20
10×(7.482
CCeνOsc.
CCeνOsc.
CCµν/µν
CCeν/eνBeam
NC
Sample Prediction at
true
δCP Data
-‐𝝅/2 0 +𝝅/2
28.7 24.1 19.6 32
6.0 6.9 7.7 4
0 500 1000
Numberofevents
0
1
2
3
4 RUN5-7 data
)POT
20
10×(7.471
CCeνOsc.
CCeνOsc.
CCµν/µν
CCeν/eνBeam
NC

2/17/17 KEK-‐PH2017
Results:
𝜈&+ appearance
0 500 1000
Numberofevents
0
1
2
3
4 RUN5-7 data
)POT
20
10×(7.471
CCeνOsc.
CCeνOsc.
CCµν/µν
CCeν/eνBeam
NC
² Test
for
𝜈* → 𝜈&+ hypothesis
w/single
para.
𝞫
² 𝞫 =
0:
No
𝜈* → 𝜈&+
² 𝞫 =
1:
𝜈* → 𝜈&+ appearance
consistent
w/

PMNS
² Use
all
four
T2K
samples
to
fully
constrain

oscillation
prob.
Rate
only
No
evidence
for
𝜈* → 𝜈&+
More
data
is
needed.

T2K
Results
2/17/17 KEK-‐PH2017
Appearance
channel
Disappearance
channel
Joint
Analysis

Oscillation
parameters
extracted
from
T2K
data
2/17/17 KEK-‐PH2017 40
0 1 2 3 4 5 6 7 8
Events
0
10
20
30
40
50
60
70
80
90
Prediction
Unoscillated
Best-Fit
Data
0 1 2 3 4 5 6 7 8
Ratio
0
1
2
3
4
0 200 400 600 800 1000 1200 1400
Events
0
0.5
1
1.5
2
2.5
3
3.5
Prediction
Unoscillated
Best-Fit
Data
Reconstructed Momentum [MeV/c]
0 200 400 600 800 1000 1200 1400
Ratio 0
2
4
6
8
0 1 2 3 4 5 6 7 8
Events
0
5
10
15
20
25 Prediction
Unoscillated
Best-Fit
Data
0 1 2 3 4 5 6 7 8
Ratio
0
1
2
3
4
0 200 400 600 800 1000 1200 1400
Events
0
2
4
6
8
10
12
14
Prediction
Unoscillated
Best-Fit
Data
Reconstructed Momentum [MeV/c]
0 200 400 600 800 1000 1200 1400
Ratio
0
5
10
15
Appearance
channel
Disappearance
channel
sensitive
to
𝜃23 &
∆ 𝑚12
2
sensitive
to
𝜃13 &
𝛿CP
CPT
is
assumed
to
be
true

Observed
data
vs.
prediction
2/17/17 KEK-‐PH2017 41
Other oscillation parameter sin2
✓13 = 0.0217,
sin2
✓23 = 0.528, m2
32( m2
13) = 2.509 ⇥ 10 3
eV 2
/c4
,
sin2
✓12 = 0.846, m2
21 = 7.53 ⇥ 10 5
eV 2
/c4

Results:
𝜃23 &
∆ 𝑚12
2
2/17/17 KEK-‐PH2017
² 𝜈 𝜇 disappearance
behaves
consistently
w/

𝜈* disappearance
² Result
consistent
with
maximal
mixing
² The
world’s
highest
precision
𝜃23

measurement
42
Normal MH Inverted MH
sin2 𝜃23 0.53289.9:;
<9.9=: 0.53489.9::
<9.9=1
∆𝑚12
2
/1081
(eV2) 2.54589.9;=
<9.9;A
2.51089.9;1
<9.9;A
𝜈:
7.48x1020 POT
+
𝜈̅:
7.47x1020
POT
T2K
Run1-‐7b
preliminary

T2K
Run1-‐7b
preliminary

Results:
𝜃13 &
𝛿CP
– T2K
data
only
2/17/17 KEK-‐PH2017 43
² Measured
𝜃13 w/
T2K
data
only
agrees

w/
reactor
measurement
² Disfavor
region
of

δCP at
≅ 𝝅/2
² Favor
δCP at
≅ -‐𝝅/2
for
both
hierarchies
13θ2
sin
0 0.02 0.04 0.06 0.08 0.1
CPδ
-3
-2
-1
0
1
2
3 NH Asimov Sensitivity
IH Asimov Sensitivity
13θ2
sin
0 0.02 0.04 0.06 0.08 0.1
CPδ
-3
-2
-1
0
1
2
3
NH - Run1-7
IH - Run1-7
Mass
hierarchy
is
fixed,
either
normal
or
inverted
and
compute
independently
T2K-‐only
Sensitivity T2K-‐only
data
fit
Reactor
(PDG
2015)
true
δCP Data
-‐𝝅/2 0 +𝝅/2
28.7 24.1 19.6 32
6.0 6.9 7.7 4

Results:
𝜃13 &
𝛿CP
– T2K
data
+
Reactors
2/17/17 KEK-‐PH2017 44
13θ2
sin
0.0160.018 0.02 0.0220.0240.0260.028 0.03 0.0320.0340.036
CPδ
-3
-2
-1
0
1
2
3 NH Asimov Sensitivity
IH Asimov Sensitivity
13θ2
sin
0.0160.018 0.02 0.0220.0240.0260.028 0.03 0.0320.0340.036
CPδ
-3
-2
-1
0
1
2
3
NH - Run1-7
IH - Run1-7
T2K
+
reactor
Sensitivity T2K
+
reactor
data
fit
Reactor
(PDG
2015)
Reactor
(PDG
2015)
Mass
hierarchy
is
fixed,
either
normal
or
inverted
and
compute
independently
true
δCP Data
-‐𝝅/2 0 +𝝅/2
28.7 24.1 19.6 32
6.0 6.9 7.7 4
² Disfavor
region
of

δCP at
≅ 𝝅/2
² Favor
δCP at
≅ -‐𝝅/2
for
both
hierarchies

Results:
𝛿CP

2/17/17 KEK-‐PH2017 45
cpδ
3− 2− 1− 0 1 2 3
LikelihoodDensity
0
0.5
1
1.5
2
2.5
3
3.5
3−
10×
68.3%
90%
95%
Frequentist approach Bayesian
approach
² δCP =0
is
excluded
at
2 𝜎 CL.
² Mild
preference
of
normal
MH
² (Frequentist)
allowed
90%
Cl.
region
Normal
Hierarchy:
[-‐3.13,0.39]
Inverted
Hierarchy:
[-‐2.09,-‐0.74]
NH IH Sum
sin2θ23≤0.5 29% 10% 39%
sin2θ23>0.5 46% 14% 61%
Sum 75% 25% 100%
Bayesian
posterior
prob.
Confidence
intervals
is
computed
w/
Feldman-‐Cousins
method,
Credible
interval
use
flat
prior
for
δCP

Perception
from
data
2/17/17 KEK-‐PH2017 46
NSK/NSK

Prospect
for
the
future
2/17/17 KEK-‐PH2017

Medium
term:
T2K-‐II
proposal

2/17/17 KEK-‐PH2017
² Approved
T2K
statistics,
7.8
x1021 POT,

can
be
accumulated
by
JFY2020
² Hyper-‐K
and
DUNE
are
expected
to
start

around
2026
² T2K-‐II,
if
extended
to
JFY2026,
collects
~

20x1021 POTà Stage
I
approval
² Neutrino
beamline upgrade
&
analysis

improvements
(SK
fiducial volume,
add

new
event
sample)

à Effectively
add 50%
statistics
² Reduction
of
systematic
uncertainties
to

enhance
CPV
sensitivity
48
Number
of
events
expected
at
T2K
far
detector

with
full
proposed
T2K
Phase
2
exposure
J-‐PARC
Main
Ring
expected
beam
power
&
T2K
Phase
2
accumulation
scenario

Medium
term:
T2K-‐II
proposal

2/17/17
)21
Protons-on-Target (x10
0 5 10 15 20
=0CPδtoexcludesin2
χ∆
0
5
10
15 =0.4323
θ2
True sin
=0.5023
θ2
True sin
=0.6023
θ2
True sin
90% C.L.
99% C.L.
C.L.σ3
w/ eff. stat. improvements (no sys. errors)
w/ eff. stat. & sys. improvements
Work in Progress
)°(CP
δTrue
200− 100− 0 100 200
=0CPδtoexcludesin2
χ∆
0
5
10
15
20
=0.4323θ2
True sin
=0.5023θ2
True sin
=0.6023θ2
True sin
90% C.L.
99% C.L.
C.L.σ3
POT w/ eff. stat. & sys. improvements21
20x10
POT w/ 2016 sys. errs.21
7.8x10
Work in Progress
CP =
⇡
2
² >
3 𝜎 significance
sensitivity
to
CP

violation
if
𝛿CP=
-‐ 𝜋/2
² 99%
C.L.
significance
for
more
than
45%

of
the
possible
true
values
of
𝛿CP
² 1%
precision
of
𝛥m2
23,
0.5o
-‐ 1.7o

precision
of
𝜃23
depending
on
its
true

value,
~3𝜎 significance
for
resolving
𝜃23

octant
if
sin2 𝜃23
>0.6
or
sin2 𝜃23
<0.43
23
θ2
sin
0.4 0.5 0.6
32
2
m∆
2.2
2.4
2.6
2.8
3
3−
10×
Current POT , 90% C.L
POT, 90% C.L21
7.8x10
POT w/improvement, 90% C.L21
20x10
Stat. only
Systematics
Work in Progress
True sin2
✓23 = 0.6
KEK-‐PH2017 49

Medium
term:
ND280
update
2/17/17 KEK-‐PH2017 50
Goal:
Understand
better
𝝂 interaction
Minimum
requirements:
+
Water
target
+
Large
angular
acceptance
+
Better
efficiency
for
detecting

low
momentum
of
p
and
𝜋
Detector
design
in
progress
Target
option

Medium
term:
Intermediate
WC
detector

2/17/17 KEK-‐PH2017 51
52.5
m
tall
WC
detector,
spanning
1o-‐4o off

the
beam
center,
1km
from
target
² Water
target

² 4𝜋 angular
acceptance

² Signal
and
background
² Flux
prediction
largely
independent
to

neutrino
interaction
model
Physics
goals:
² Oscillation
analysis
w/
modest
need
of

neutrino
interaction
model
² Sterile
neutrino
search
Same
as
Super-‐K
Separate
collaboration
from
T2K
Receive
stage-‐1
status
as
E-‐62
exp.
(from
July
2016)
Design
concept

Longer
term:
Hyper-‐Kamiokande
2/17/17 KEK-‐PH2017 52
Gigantic
WC
detector,
520
kton (ref.
50
kton
of
Super-‐K
),
aim
to
start
operation
in
2026
² Neutrino
CP
violation
up
to
>
5 𝜎
² Neutrino
mass
hierarchy
² Also
for
proton
decay,
supernova…
Selected
as
one
of
important
large
scale
projects
by
SCJ
T2KK:
Move
2nd Hyper-‐K
tank
to
Korea?
+
CP
violation
at
2nd osc.
peak
+
Enhance
matter
effect

Longer
term:
Hyper-‐Kamiokande
2/17/17 KEK-‐PH2017 53
Brief
story
of
K
Prof.
M.
Koshiba Prof.
T.
Kajita
2002 2015

Quest
for
THEORISTS
(2)
2/17/17 KEK-‐PH2017 54
NSK/NSK
To
THEORISTS
(2):
How
can
we
sure
what

we
measure
is
CP
violation
phase?
The
CP
violation
sensitivity
is
based
on
standard

framework.
Experimentalists
measure
merely

probabilities
and
can
be
fooled
by

² Sterile
neutrinos
² Non-‐standard
interactions
² ….

Quest
for
THEORISTS
(3)
2/17/17 KEK-‐PH2017 55
NSK/NSK
arXiv:1410.8056
Assume
CP
is
observed,
the

next
targets
are
probably

precision
of
CP
phase
and

PMNS
unitary
testing
To
THEORISTS
(3):
Can
we
have
more

“predictable”
model?
say,
on
CP
phase,

unitary
of
matrix
for
example

Summary
2/17/17 KEK-‐PH2017
² Results
with
T2K
data
shown
o No
CPT
indication
from

o Consistent
with
𝜃23 maximal
mixing

o Slightly
prefer
normal
mass
hierarchy
o Slightly
favor
𝛿CP =
-‐ 𝜋/2

𝛿CP =
[-‐3.13,
-‐0.39]
(NH),
[-‐2.09,
-‐0.74]
(IH)
at
90%
C.L.
à More
statistics
are
needed

² J-‐PARC
beam
power
has
steadily
increased
up
to
420
kW
(operating

at
470
kW
recently)à key
roles
for
neutrino
measurements
² Neutrino
physics
roadmap
in
Japan
is
clear
and
exciting
Stay
tuned
for
upcoming
results
from
T2K
56
*Number
of
anime
taken
http://higgstan.com

2/17/17 KEK-‐PH2017 57
Thank
you!

Backup
2/17/17 KEK-‐PH2017 58
NSK/NSK

Backup:
CP
&
MH
effect
2/17/17 KEK-‐PH2017 59
NSK/NSK
)eν→µνP(
0 0.02 0.04 0.06 0.08
)eν→µνP(
0
0.02
0.04
0.06
0.08
-3
10×|=2.4232
2
m∆|
-5
10×|=7.5421
2
m∆|
=0.9523θ22
sin
=0.8812
θ22
sin
=0.0913θ22
sin
L=295 km
=0.6 GeVνE
>032
2
m∆
<032
2
m∆
=0CP
δ
/2π=CPδ
π=CP
δ
/2π=3CPδ
High
octant
Low
octant
² Negative
CP
enhances
electron
neutrino
appearance
and
suppresses

electron
antineutrino
appearance
² MH
enhances
electron
neutrino
appearance
and
suppresses
electron

antineutrino
appearance

Backup:
Accelerator
update
schedule
2/17/17 KEK-‐PH2017 60
NSK/NSK
PAC
Jan
2017

Backup:
Systematic
error
table
2/17/17 KEK-‐PH2017 61
NSK/NSK

Backup:
Data
fit
vs
sensitivity
2/17/17 KEK-‐PH2017 62
10k
toys 10k
toys
² Toy
experiments
at
true
values
of
𝛿CP
&
MH

generated
to

understand
data
fit
outcomes
² Probability
to
exclude
𝛿CP
=
(0,
𝜋)
is
evaluated
² Data
agree
w/
𝛿CP =
-‐1.76
(~-‐𝜋/2),
normal
MH

at
2 𝜎 level
and
probability
to
exclude
𝛿CP
=0
is

non-‐negligible
(>8%)
True:
𝛿CP =
-‐1.76,
normal
MHTrue:
𝛿CP =
0,
normal
MH
Prop.
(%)
to
exclude

True
para.
𝛿CP =
-‐1.76,
NH
True
para.
𝛿CP =
0,
NH
90%
CL 2𝝈 90%
CL 2𝝈
𝛿CP =0,
NH 19.1 8.5 10.8 4.8
𝛿CP =𝜋,
NH 15.7 6.5 14.9 6.7

Backup:
Flux/
target
632/17/17 KEK-‐PH2017

BANFF:
flux
RHC
2/17/17 KEK-‐PH2017
² 15%
increase
64
(GeV)νE
-1
10 1 10
FluxParameterValue
0.6
0.7
0.8
0.9
1
1.1
1.2
1.3
1.4
beam modeν,eνND280
(GeV)νE
-1
10 1 10
FluxParameterValue
0.6
0.7
0.8
0.9
1
1.1
1.2
1.3
1.4
beam modeν,eνND280
(GeV)νE
-1
10 1 10
FluxParameterValue
0.6
0.7
0.8
0.9
1
1.1
1.2
1.3
1.4
(GeV)νE
-1
10 1 10
FluxParameterValue
0.6
0.7
0.8
0.9
1
1.1
1.2
1.3
1.4

T2K
off-‐axis
detector:
ND280
2/17/17 KEK-‐PH2017
Aim
to
understand
unoscillated 𝜈 beam:
constrains
flux

and
cross-‐section
parameters

² Tracker,
composed
of
Fine-‐Grained
Detector
(FGD)

and
Time
Projection
Chamber
(TPC),
is
central
part
o Two
FGDs:

active
target
w/
scintillator
only

(FGD1)
or

scintillator-‐water
interleaved
(FGD2)
o Three
TPCs:
mainly
Argon
(95%)
filled,
for

momentum
measurement
and
particle
ID

² 𝜋0
detector
(POD)
for
water-‐scintillator
target
and
𝜋0
tagging

² Electromagnetic
calorimeters
(ECal)
to
detect
gamma

rays
and
reconstruct
𝜋0
² Side
muon range
detectors
(SMRD)
to
tag
entering

cosmic
muons or
side-‐exiting
muons
Key
features
for
cross-‐section:

o Narrow
flux
spectrum
,
mean
~
0.85
GeV
o Multiple
targets:
scintillator,
water,
argon,
lead
o High
final
state
ID
resolution,
charge
separation

65
~B
0.2
T

Neutrino
cross-‐section
662/17/17 KEK-‐PH2017
?

About
energy
reconstruction
672/17/17 KEK-‐PH2017
?
Issue
raised
recently
No
observation
yet!

Pre-‐fit:
muon momentum
2/17/17 KEK-‐PH2017 68
0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000
Events/(100MeV/c)
0
500
1000
1500
2000
2500
Data
CCQEν
CC 2p-2hν
πCC Res 1ν
πCC Coh 1ν
CC Otherν
NC modesν
modesν
FGD1,
nu,
CC0pi
0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000
Events/(100MeV/c)
0
50
100
150
200
250
300
350
400
Data
CCQEν
CC 2p-2hν
πCC Res 1ν
πCC Coh 1ν
CC Otherν
NC modesν
modesν
FGD1,
nu,
CC1pi
0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000
Events/(100MeV/c)
0
50
100
150
200
250
Data
CCQEν
CC 2p-2hν
πCC Res 1ν
πCC Coh 1ν
CC Otherν
NC modesν
modesν
FGD1,
nu,
CCres
0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000
Events/(100MeV/c)
0
50
100
150
200
250
Data
CCQEν
non-CCQEν
CCQEν
non-CCQEν
FGD1,
Antinu,
CC1trk
0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000
Events/(100MeV/c)
0
5
10
15
20
25
30
35
40
Data
CCQEν
non-CCQEν
CCQEν
non-CCQEν
FGD1,
Antinu,
CCNtrk
0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000
Events/(100MeV/c)
0
10
20
30
40
50
60
Data
CCQEν
non-CCQEν
CCQEν
non-CCQEν
FGD1,
nu,
CC1trk
0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000
Events/(100MeV/c)
0
5
10
15
20
25
30
35
40
Data
CCQEν
non-CCQEν
CCQEν
non-CCQEν
FGD1,
nu,
CCNtrk

Post-‐fit:
muon momentum
2/17/17 KEK-‐PH2017 69
0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000
Events/(100MeV/c)
0
500
1000
1500
2000
2500
Data
CCQEν
CC 2p-2hν
πCC Res 1ν
πCC Coh 1ν
CC Otherν
NC modesν
modesν
FGD1,
nu,
CC0pi
0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000
Events/(100MeV/c)
0
50
100
150
200
250
300
350
400
Data
CCQEν
CC 2p-2hν
πCC Res 1ν
πCC Coh 1ν
CC Otherν
NC modesν
modesν
FGD1,
nu,
CC1pi
0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000
Events/(100MeV/c)
0
50
100
150
200
250
Data
CCQEν
CC 2p-2hν
πCC Res 1ν
πCC Coh 1ν
CC Otherν
NC modesν
modesν
FGD1,
nu,
CCres
0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000
Events/(100MeV/c)
0
50
100
150
200
250
Data
CCQEν
non-CCQEν
CCQEν
non-CCQEν
FGD1,
Antinu,
CC1trk
0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000
Events/(100MeV/c)
0
5
10
15
20
25
30
35
40
Data
CCQEν
non-CCQEν
CCQEν
non-CCQEν
FGD1,
Antinu,
CCNtrk
0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000
Events/(100MeV/c)
0
10
20
30
40
50
60
Data
CCQEν
non-CCQEν
CCQEν
non-CCQEν
FGD1,
nu,
CC1trk
0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000
Events/(100MeV/c)
0
5
10
15
20
25
30
35
40
Data
CCQEν
non-CCQEν
CCQEν
non-CCQEν
FGD1,
nu,
CCNtrk

Pre-‐fit:
muon angle
2/17/17 KEK-‐PH2017
² 2x3
sample
for

neutrinos
(FGD1,2)
² 2x4
sample
for
anti-‐
neutrinos
(FGD1,2)
70
θMuon cos
0.8 0.82 0.84 0.86 0.88 0.9 0.92 0.94 0.96 0.98 1
Events/(0.01)
0
50
100
150
200
250
Data
CCQEν
non-CCQEν
CCQEν
non-CCQEν
FGD1,
Antinu,
CC1trk
θMuon cos
0.8 0.82 0.84 0.86 0.88 0.9 0.92 0.94 0.96 0.98 1
Events/(0.01)
0
50
100
150
200
250
Data
CCQEν
non-CCQEν
CCQEν
non-CCQEν
FGD1,
Antinu,
CCNtrk
θMuon cos
0.6 0.65 0.7 0.75 0.8 0.85 0.9 0.95 1
Events/(0.01)
0
200
400
600
800
1000
1200
1400
1600 Data
CCQEν
CC 2p-2hν
πCC Res 1ν
πCC Coh 1ν
CC Otherν
NC modesν
modesν
FGD1,
nu,
CC0pi
θMuon cos
0.6 0.65 0.7 0.75 0.8 0.85 0.9 0.95 1
Events/(0.01)
0
100
200
300
400
500
Data
CCQEν
CC 2p-2hν
πCC Res 1ν
πCC Coh 1ν
CC Otherν
NC modesν
modesν
FGD1,
nu,
CC1pi
θMuon cos
0.6 0.65 0.7 0.75 0.8 0.85 0.9 0.95 1
Events/(0.01)
0
100
200
300
400
500
Data
CCQEν
CC 2p-2hν
πCC Res 1ν
πCC Coh 1ν
CC Otherν
NC modesν
modesν
FGD1,
nu,
CCres
θMuon cos
0.8 0.82 0.84 0.86 0.88 0.9 0.92 0.94 0.96 0.98 1
Events/(0.01)
0
20
40
60
80
100
120
140
160
Data
CCQEν
non-CCQEν
CCQEν
non-CCQEν
θMuon cos
0.8 0.82 0.84 0.86 0.88 0.9 0.92 0.94 0.96 0.98 1
Events/(0.01)
0
20
40
60
80
100
120
140
Data
CCQEν
non-CCQEν
CCQEν
non-CCQEν
FGD1,
nu,
CC1trk
FGD1,
nu,
CCNtrk

Post-‐fit:
muon angle
2/17/17 KEK-‐PH2017 71
θMuon cos
0.8 0.82 0.84 0.86 0.88 0.9 0.92 0.94 0.96 0.98 1
Events/(0.01)
0
50
100
150
200
250
Data
CCQEν
non-CCQEν
CCQEν
non-CCQEν
FGD1,
Antinu,
CC1trk
θMuon cos
0.8 0.82 0.84 0.86 0.88 0.9 0.92 0.94 0.96 0.98 1
Events/(0.01)
0
50
100
150
200
250
Data
CCQEν
non-CCQEν
CCQEν
non-CCQEν
FGD1,
Antinu,
CCNtrk
θMuon cos
0.6 0.65 0.7 0.75 0.8 0.85 0.9 0.95 1
Events/(0.01)
0
200
400
600
800
1000
1200
1400
1600 Data
CCQEν
CC 2p-2hν
πCC Res 1ν
πCC Coh 1ν
CC Otherν
NC modesν
modesν
FGD1,
nu,
CC0pi
θMuon cos
0.6 0.65 0.7 0.75 0.8 0.85 0.9 0.95 1
Events/(0.01)
0
100
200
300
400
500
Data
CCQEν
CC 2p-2hν
πCC Res 1ν
πCC Coh 1ν
CC Otherν
NC modesν
modesν
FGD1,
nu,
CC1pi
θMuon cos
0.6 0.65 0.7 0.75 0.8 0.85 0.9 0.95 1
Events/(0.01)
0
100
200
300
400
500
Data
CCQEν
CC 2p-2hν
πCC Res 1ν
πCC Coh 1ν
CC Otherν
NC modesν
modesν
FGD1,
nu,
CCres
θMuon cos
0.8 0.82 0.84 0.86 0.88 0.9 0.92 0.94 0.96 0.98 1
Events/(0.01)
0
20
40
60
80
100
120
140
160
Data
CCQEν
non-CCQEν
CCQEν
non-CCQEν
θMuon cos
0.8 0.82 0.84 0.86 0.88 0.9 0.92 0.94 0.96 0.98 1
Events/(0.01)
0
20
40
60
80
100
120
140
Data
CCQEν
non-CCQEν
CCQEν
non-CCQEν
FGD1,
nu,
CC1trk
FGD1,
nu,
CCNtrk
² 2x3
sample
for

neutrinos
(FGD1,2)
² 2x4
sample
for
anti-‐
neutrinos
(FGD1,2)

KEK PH 2017

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KEK PH 2017