Neutrino Mass Ordering and Its Implications
How will we first measure the
Neutrino Mass Ordering?
João Coelho
IJCLab - Orsay
12 February 2021
12 Feb 2021
1
What’s all this about NMO?
12 Feb 2021
3
N
o
r
m
a
l
O
r
d
e
r
i
n
g
I
n
v
e
r
t
e
d
O
r
d
e
r
i
n
g
Which
one
is it?
•
Neutrino mass implies new physical interactions
•
Determining the mass hierarchy rules out ~½ of the
models of mass generation
•
Also important consequences for cosmology, 0
decay, super-nova astronomy, earth tomography, etc.
What’s the status of NMO?
12 Feb 2021
4
1
.
6
2
.
7
N
e
w
S
K
d
a
t
a
w
i
l
l
p
u
s
h
t
h
i
s
d
o
w
n
t
o
~
2
.
5
nu-fit.org
How do we know this?
12 Feb 2021
5
H
0
V
e
e
Matter
Tilted Oscillations
12 Feb 2021
6
H
eff
= H
0
- V
H
eff
= H
0
+ V
Resonances
12 Feb 2021
7
Effect on LBL
e
appearace
12 Feb 2021
8
N
O
v
A
T
2
K
Effect on LBL
e
appearace
12 Feb 2021
9
J
o
i
n
t
v
i
e
w
How come NuFIT says Normal?
12 Feb 2021
10
Inverted
Ordering
Normal
Ordering
1
.
2
1
.
6
•
Preference flips!
•
More on that later…
nu-fit.org
What about atmospherics?
12 Feb 2021
11
•
Huge effect for mantle-crossing neutrinos
What about atmospherics?
12 Feb 2021
12
•
But reality is a lot more complicated
1
.
8
Y. Nakajima – Neutrino 2020
S
u
p
e
r
-
K
a
m
i
o
k
a
n
d
e
Exposure: 364.8 kton-years
(~16 years)
What to expect before DUNE?
12 Feb 2021
13
•
Super-K gets diminishing returns after 25 years running
•
NOvA dominates from LBL, but T2K plays important role
•
Combined 5
potential, but not in current preferred region
•
Max
2
: NOvA ~ 23 units, T2K ~ 3 units, SK ~ 3 units
What about the near future?
12 Feb 2021
14
J
U
N
O
~
3
O
R
C
A
~
2
.
5
–
4
.
5
(Depending on true ordering)
•
A
t
f
a
c
e
v
a
l
u
e
,
i
f
t
h
e
t
r
u
e
o
r
d
e
r
i
n
g
i
s
i
n
v
e
r
t
e
d
,
n
o
t
5
•
2
: NOvA+T2K ~ 0 units, SK ~ 3 units?,
JUNO ~ 9 units, ORCA ~ 6-9 units
Total ~ 20 units (4.5
)
3
y
e
a
r
s
D. Samtleben – Neutrino 2020
CERN Courier
A closer look at NMO in vacuum
12 Feb 2021
15
N
M
O
A closer look at NMO in vacuum
12 Feb 2021
16
(A.U.)
A closer look at NMO in vacuum
12 Feb 2021
17
Normal Ordering
Inverted Ordering
S
l
o
w
e
r
More than one turn
to reach maximum
F
a
s
t
e
r
Less than one turn
to reach maximum
A closer look at NMO in vacuum
12 Feb 2021
18
•
NMO can be determined by oscillation frequency
•
However…
A closer look at NMO in vacuum
12 Feb 2021
19
•
NMO can be determined by oscillation frequency
•
However… energy resolution and…
A closer look at NMO in vacuum
12 Feb 2021
20
•
NMO can be determined by oscillation frequency
•
However… energy resolution and… unknown freq. scale
↔
e
synergy
12 Feb 2021
21
e
•
Mixing structure leads to different effective frequencies
How much do we stand to gain?
12 Feb 2021
22
•
S
y
n
e
r
g
y
b
e
t
w
e
e
n
J
U
N
O
a
n
d
L
B
L
c
a
n
a
d
d
1
0
–
4
0
u
n
i
t
s
o
f
2
•
Exploits extra data from LBL disappearance to probe NMO
•
Effect highly dependent on precision of LBL on
m
2
32
And it’s not just LBL either
12 Feb 2021
23
•
S
y
n
e
r
g
i
e
s
b
e
t
w
e
e
n
J
U
N
O
a
n
d
O
R
C
A
,
f
o
r
e
x
a
m
p
l
e
,
c
a
n
a
d
d
e
v
e
n
m
o
r
e
b
o
o
s
t
i
n
g
t
o
t
h
e
N
M
O
d
e
t
e
r
m
i
n
a
t
i
o
n
(
~
4
0
u
n
i
t
s
o
f
2
)
N. Chau – Neutrino 2020
What’s the lesson here?
12 Feb 2021
24
•
No single experiment is likely to reach 5
on NMO by 2028
•
The
disapp. channel may provide the extra boost needed
•
L
B
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a
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d
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12 Feb 2021
25
T
h
a
n
k
y
o
u
!
Delve into the world of neutrino mass ordering, from the methods of measurement to the significance of Normal versus Inverted Ordering. Discover how determining the mass hierarchy impacts our understanding of physical interactions, cosmology, decay processes, and more. Uncover the latest updates on NMO status and the implications for LBL e appearance. Dive deep into the complexities of atmospheric neutrinos and the intricate realities of neutrino research with key insights from recent studies and experiments.
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Presentation Transcript
How will we first measure the Neutrino Mass Ordering? Jo o Coelho IJCLab - Orsay 12 February 2021 12 Feb 2021 1
Mostly based on https://inspirehep.net/literature/1813376 12 Feb 2021 2
Whats all this about NMO? Normal Ordering Inverted Ordering Which one is it? Neutrino mass implies new physical interactions Determining the mass hierarchy rules out ~ of the models of mass generation Also important consequences for cosmology, 0 decay, super-nova astronomy, earth tomography, etc. 12 Feb 2021 3
Whats the status of NMO? New SK data will push this down to ~2.5 2.7 nu-fit.org 1.6 12 Feb 2021 4
How do we know this? H0 V e Matter e 12 Feb 2021 5
Tilted Oscillations Heff = H0 - V Heff = H0 + V 12 Feb 2021 6
Resonances 23 ORCA JUNO 12 DUNE 13 NOvA T2K 12 Feb 2021 7
Effect on LBL e appearace NOvA T2K 12 Feb 2021 8
Effect on LBL e appearace Joint view 12 Feb 2021 9
How come NuFIT says Normal? Inverted Ordering Normal Ordering 1.2 nu-fit.org Preference flips! More on that later 1.6 12 Feb 2021 10
What about atmospherics? Huge effect for mantle-crossing neutrinos core mantle 12 Feb 2021 11
What about atmospherics? But reality is a lot more complicated Exposure: 364.8 kton-years (~16 years) Super-Kamiokande 1.8 Y. Nakajima Neutrino 2020 12 Feb 2021 12
What to expect before DUNE? Super-K gets diminishing returns after 25 years running NOvA dominates from LBL, but T2K plays important role Combined 5 potential, but not in current preferred region Max 2: NOvA ~ 23 units, T2K ~ 3 units, SK ~ 3 units Preferred Preferred 12 Feb 2021 13
What about the near future? ORCA ~ 2.5 4.5 (Depending on true ordering) JUNO ~ 3 3 years D. Samtleben Neutrino 2020 CERN Courier At face value, if the true ordering is inverted, not 5 2: NOvA+T2K ~ 0 units, SK ~ 3 units?, JUNO ~ 9 units, ORCA ~ 6-9 units Total ~ 20 units (4.5 ) 12 Feb 2021 14
A closer look at NMO in vacuum NMO 12 Feb 2021 15
A closer look at NMO in vacuum (A.U.) 12 Feb 2021 16
A closer look at NMO in vacuum Normal Ordering Inverted Ordering Slower More than one turn to reach maximum Faster Less than one turn to reach maximum 12 Feb 2021 17
A closer look at NMO in vacuum NMO can be determined by oscillation frequency However 12 Feb 2021 18
A closer look at NMO in vacuum NMO can be determined by oscillation frequency However energy resolution and 12 Feb 2021 19
A closer look at NMO in vacuum NMO can be determined by oscillation frequency However energy resolution and unknown freq. scale 12 Feb 2021 20
e synergy Mixing structure leads to different effective frequencies e 12 Feb 2021 21
How much do we stand to gain? Synergy between JUNO and LBL can add 10 40 units of 2 Exploits extra data from LBL disappearance to probe NMO Effect highly dependent on precision of LBL on m232 Hard Doable Easy? 12 Feb 2021 22
And its not just LBL either Synergies between JUNO and ORCA, for example, can add even more boosting to the NMO determination (~40 units of 2) N. Chau Neutrino 2020 12 Feb 2021 23
Whats the lesson here? No single experiment is likely to reach 5 on NMO by 2028 The disapp. channel may provide the extra boost needed LBL and atmospheric experiment should keep in mind the importance of m232 resolution in their future planning 5 12 Feb 2021 24
Thank you! 12 Feb 2021 25
