ILC Physics
a theorist’s perspective
Koji TSUMURA (Kyoto from Dec 1 )
Toku-sui annual workshop 2013
st
KEK, Dec. 17-19, 2013
Plan of my talk
STATUS
Where are we?
New Era of the SM
What we need to do?
Physics Beyond the SM
Why? Where is it?
ILC Physics
What do we do?
2013/12/11 ILC Toku-sui ann. WS 2013
Koji TSUMURA
2013/12/11 ILC Toku-sui ann. WS 2013
Koji TSUMURA
Status
Where are we ?
2013/12/11 ILC Toku-sui ann. WS 2013
Koji TSUMURA
2012
A new particle is found !!
2013/12/11 ILC Toku-sui ann. WS 2013
Koji TSUMURA
2013
3 decay channels are seen (≥3s, each)
Spin 0 is favored
A Higgs boson is confirmed !!
2013/12/11 ILC Toku-sui ann. WS 2013
Koji TSUMURA
e µ
e± τ ∓
µ± τ ∓
pe
pµ
LF
[i ] <
1.7
LF
LF
[i ] <
[i ] <
9.8
1.2
× 10
CL= 95%
−
6
× 10
CL= 95%
× 10− 5 CL= 95%
× 10− 6 CL= 95%
45594
45576
45576
The Review of Particle Physics (2013)
L,B
L,B
<
<
1.8
1.8
× 10− 6 CL= 95%
Higgs Bosons — H 0 and H ±
45589
45589
Mass determined
H 0 Mass m = 125.9 ± 0.4 GeV
H 0 signal strengths in different channels
NEW
Citation: J. Beringer et al.
Combined Final States = 1.07 ± 0.26 (S = 1.4)
W W ∗ Final State = 0.88 ± 0.33 (S = 1.1)
Z Z ∗ Final State = 0.89 +− 0.30
0.25
3 decay channels are seen
γ γData
Final
State
= , 1.65
0.33
(Particle
Group),
PR D 86
010001±(2012)
and 2013 partial update for the 2014 edition (URL: http:/ / pdg.lbl.gov)
+ 0.8
bb Final State = 0.5 − 0.7
τ + τ − Final State = 0.1 ± 0.7
H 0 DECAY MODES
CERN seminars on
Nov. 26 & Dec. 3
HTTP:/ / PDG.LBL.GOV
W W∗
Z Z∗
γγ
bb
τ+ τ−
Fract ion (Γi / Γ)
Page 4
seen
seen
seen
possibly seen
possibly seen
p (M eV/c)
Created: 7/ 12/ 2013 14:49
–
–
–
–
–
Mass Limits for the Standard Model Higgs
Mass m > 122 and none 127–600 GeV, CL = 95%
The limits for H 01 and A0 in supersymmetric models refer to the mmax
h
benchmark scenario for the supersymmetric parameters.
H 01 in Supersymmetric Models (mH 0 < mH 0 )
1
2
Mass m > 92.8 GeV, CL = 95%
A0 Pseudoscalar Higgs Boson in Supersymmetric Models [n]
Mass m > 93.4 GeV, CL = 95% tanβ > 0.4
2013/12/11 ILC Toku-sui ann. WS
KojiCL
TSUMURA
H ± 2013
Mass m > 79.3 GeV,
= 95%
July 2013
Summary%
%
%
• H®μμ:&no&excess&over&
New
Results
H®ττ%
Search:%
Compa@bility%
With%
M =125%
GeV%
A
T
L
A
S
P
r
e
lim
.
ln
(
1
+
S
/B
)w
.E
v
e
n
ts
/1
0
G
e
V
m
=
1
2
5
.5
G
e
V
H
(statistical)
T
o
ta
lu
n
c
e
r
ta
in
ty
(syst.incl.theo.)
(theory)
± 1o
n
m
CERN seminars
on Nov. 26 & Dec. 3
H
background&
observed&
H→tt:
Combined
M
– Observed&limit:&9.8×SM&
mA
=
1
.
5
5
A
fermionic
decay channel
•
L
A
S
P
r
e
lH®ττ%
im
in
a
r
y
7
0 T
Search:%
Results%
Per%
Channel%
Expected&
limit:&
&&
em, et(tt)
, –mtis
, almost
t t onlyseen
(ee, 8.2×SM&
mm use BDT)
H V
B
F
+
B
o
o
s
te
d
H
ZZ*
6
0 4l
H
+0
.2
3
P
h
y
s
.L
e
tt.B
7
2
6
(
2
0
1
3
)8
8
-0
.2
2
+0
.2
4
.1
8
+0
.3
3- 0
+0
.1
7
D
a
ta
-0
.2
8- 0
.1
2
H
(
1
2
5
)
+0
.3
5
P
h
y
s
.L
e
tt.B
7
2
6
(
2
0
1
3
)8
8
-0
.3
2
Z
+0
.2
0
1
(statistical)
.1
3
O
th
e
r
s
+0
.4
0- 0
+0
.1
7
F
a
k
e
s
(syst. incl. theory)
-0
.3
5- 0
.1
0
U
n
c
e
r
t.
+0
.2
0
P
h
y
s
.L
e
tt.B
7
2
6
(
2
0
1
3
)
8
8
(theory)
-0
.2
1
0.3
++-0
.2
3
0.3
0
.1
9
+0
.
3
1 + 0.4
+
0.5
1.4 -0.4 +-0
0.3
.1
5
-0
.2
8-+0
0.3
.0
9
- 0.2
L
d
t=
2
0
.3
fb
ATLAS
Prelim.
m
=
1
.
4
3
5
0
(
m=
1
.4
)
Total uncertainty
s
=
8
T
e
V
mH = 125 GeV
0 l l
H 4
WW*
± 1 on m
++0
.1
3
P
h
y
s
.L
e
tt.B
7
2
6
(
2
0
1
3
)8
8
2
0 m = 1.2 +-0.8
0.5
Combined
Boosted
0.6 --0
.1
4
0.4
H
, ZZ*, WW*
+0
.1
7
1
0
w
.D
a
ta
B
k
g
.
H
+0.6 + 0.4
.1
3
m = 1.6
+0
.2
1- 0
0.4
m=
1
.3
3-0.5 +-0
.1
2
0
lep lep
0.8
-0
.1
8-+0
.1
0
m = 2.0
- 0.7
+1.0 + 0.7
-0.9 - 0.5
+ 0.4
±-0
.5
0.2
A
T
L
A
S
C
O
N
F
2
0
1
3
0
7
9
(
1
2
5
)
(
m=
1
.4
)
W,Z H bb H
+1.8 + 1.3
Boosted
H
(
1
1
0
)
(
m
=
1
.
8
)
m = 2.0 -1.5 ±-0
1.3
.4
1
0 H
.7(
(
1
5
0
)+0
m=
5
.9
)
m=
0
.2
+1.2 + 1.0
VBF
m = 2.2-0
6<
.1
-.
1.1
-0
0.9
h
h h
•• H®bb:&no&excess&over&
background&observed&
0m =
m.
=9
0
9
H3
VBF
h
• –Excess%
of%
data%
events%
is%
– Observed&
limit:&
1.4×SM&
consistent%
with%
–– Expected&limit:&1.3×SM&&&
presence%
of%
Higgs%
at%
125%
• ATLAS%
4.1σ%
GeV% observed%
evidence%
for%
H®ττ%
decay
• ATLAS%
results%
show%
that%
the%
Higgs%
boson%
does%
not%
H
(8TeV: 20.3 fb )
H 0
m = 1.4
New!%
6
0
8
01
0
01
2
01
4
01
6
01
8
02
0
0
m=
1
.4
universally%
couple%
to%
fermion
m = 1.2
M
M
C
m [G
e
V
]
0
.50 0
.5 11
.5 2 (leptons)%
s
=
7
T
e
VL
d
t=
.
6
4
.8
fb m4
=
1.6
lep had
Boosted
++0
.3
0.4
-1 --0
0.4
.3
0.5
+0.6 ++0
.4
0.3
-0.5
.3
0.3
+0
.5-+0
0.1
+-0
.3
-0
.4 0.6
.2
+1.1 -+0
-0.8 - 0.6
1
+0.8+ 0.6
-0.6 - 0.5
VBF
11/26/13&
+ 0.5
+ 0.2
- 0.1
Uncertain@es%
on%
μ:%
CERN&seminar&
S
ig
n
a
ls
tr
e
n
g
th
(
m)
Koji TSUMURA
1
-0.5
s
=
8
T
e
VL
d
t=
2
0
.7
/2
0
.3
fb
+0.8 + 0.6 ann. WS 2013
2013/12/11
ILC
Toku-sui
H
had had m = 1.0 -0.6 - 0.4
44&
So far, so GOOD.
2013/12/11 ILC Toku-sui ann. WS 2013
Koji TSUMURA
New Era of the SM
started
What we need ?
2013/12/11 ILC Toku-sui ann. WS 2013
Koji TSUMURA
− 0.027 674 89 (74)
− 0.073 445 8 (54)
1.417 637 (67)
0.598 838 (19)
0.822 36 (13)
− 1.138 52 (20)
− 0.990 72 (10) c
− 2.1755 (20)
6
12
150
18
60
48
18
518
I I(b)
I I(c)
III
IV (a)
IV (b)
IV (c)
IV (d)
V
SM is successful
EM:
Precision test
− 0.039 000 3 (2
− 0.095 097 (24)
0.817 92 (95)
0.635 83 (44)
0.041 05 (93)
− 0.1897 (64)
− 0.1778 (12)
0
I(a)
I(b)
I(c)
I(d)
I(e)
I(f)
I(g)
I(h)
I(i)
I(j)
II(a)
II(b)
II(c)
II(d)
II(e)
II(f)
III(a)
III(b)
III(c)
IV
EW:
QCD:
V
Higgs:
VI(f)
2013/12/11 ILC Toku-sui ann. WS 2013
VI(a)
VI(g)
Electron g-2
10th order
VI(b)
VI(c)
VI(d)
VI(e)
VI(h)
VI(i)
VI(j)
VI(k)
T ypical self-energy-like diagrams represent ing 32
FIG. 2.
Koji
TSUMURA
gauge-invariant subset s cont ribut ing t o t he t ent h-order lept on
g− 2. Solid lines represent lept on lines propagat ing in a weak
in
ge
ha
sc
fo
I(
di
T
lig
an
co
fe
hu
[3
ca
us
bl
tr
SM is successful
EM:
Precision test
W, Z, h, t, b
EW:
W, Z
QCD:
Higgs:
2013/12/11 ILC Toku-sui ann. WS 2013
New Physics
EW precision (LEP)
Koji TSUMURA
SM is successful
“Deviation” in r  Predict Mt
EW:
t, b
W, Z
2013/12/11 ILC Toku-sui ann. WS 2013
Koji TSUMURA
SM is successful
“Deviation” in r  Predict Mh
6
mLimit = 152 GeV
March 2012
Theory uncertainty
Dahad =
(5)
5
EW:
0.02750±0.00033
0.02749±0.00010
2
4
Dc
2
incl. low Q data
3
2
h
W, Z
2013/12/11 ILC Toku-sui ann. WS 2013
1
0
LEP
excluded
40
Koji TSUMURA
LHC
excluded
100
mH [GeV]
200
SM is successful
0.24
0.22
0.2
0.18
0.16
0.14
0.12
0.1
D0 inclusive jets
D0 angular correlation
H1
ZEUS
103
CMS Preliminary
+0.0065
CMS Incl. Jets : aS(MZ)=0.1185-0.0041
CMS R32
CMS tt cross section
CMS 3-Jet mass
CMS Incl. Jets
QCD:
0.08
0.06
102
Q (GeV)
Koji TSUMURA
2013/12/11 ILC Toku-sui ann. WS 2013
pQCD ≥1TeV (LHC)
Higgs:
10
EW:
Precision test
EM:
aS(Q)
SM is successful
Gauge forces are tested
EM:
Gauge principle
EW:
QCD:
Higgs:
Unification of 3 forces ?
2013/12/11 ILC Toku-sui ann. WS 2013
Koji TSUMURA
SM is successful
EM:
EW:
QCD:
Why not?
Higgs precision (ILC)
Higgs force
(Origin of mass)
Higgs:
2013/12/11 ILC Toku-sui ann. WS 2013
Koji TSUMURA
Why Higgs?
2013/12/11 ILC Toku-sui ann. WS 2013
Koji TSUMURA
“Energy Frontier” study for Snowmass 2013
Introduction
the discovery of the Higgs boson has changed our viewpoint …
1st, the Higgs boson completes the particle spectrum of the SM.
It is clear now exactly what the model does not explain.
2nd, one of the key mysteries concerns the Higgs boson itself.
3rd, the Higgs boson itself give us a new experimental approach.
We are here !!
This is a new tool to probe New Physics scale.
2013/12/11 ILC Toku-sui ann. WS 2013
Koji TSUMURA
What is the SM ?
Matter contents  quarks, lepton, Higgs (completed)
Gauge symmetry  gluon, W, Z, g (tested)
Renormalizability  loop corrections (tested)
All parameters are now fixed!!
2013/12/11 ILC Toku-sui ann. WS 2013
Koji TSUMURA
Not yet Tested !!
What is the origin of mass ?
Higgs mechanism ? Fermion Mass hierarchy, mixing, CP violation ?
Higgs mechanism
Yukawa interaction
Higgs self-interaction
(New) non-Gauge force
2013/12/11 ILC Toku-sui ann. WS 2013
Koji TSUMURA
Not yet Tested !!
What is the origin of mass ?
Higgs mechanism ? Fermion Mass hierarchy, mixing, CP violation ?
Comparison of LHC and ILC Higgs coupling accuracies ?
Here is the figure from the ILC TDR:
LHC = 300/fb
ILC = TDR
M. Peskin
2013/12/11 ILC Toku-sui ann. WS 2013
Koji TSUMURA
2013/12/11 ILC Toku-sui ann. WS 2013
Koji TSUMURA
Mh as an input
Need further precision in dMW to discriminate two
M. Baak
Uncertainty on MW from Global Fit is reduced to 15 MeV w/ Mh.
[ More precise than direct measurements (≈20MeV) !! ]
2013/12/11 ILC Toku-sui ann. WS 2013
Koji TSUMURA
Mt as an input
M. Baak
Largest uncertainties come from Mt
2013/12/11 ILC Toku-sui ann. WS 2013
Koji TSUMURA
Need Theorist’s effort
Mt as an input
M. Baak
Tohoku Forum for Creativity, Oct. 23 2013, Hiroshi YOKOYA
18
Scan at the ILC
Fujii,Matsui,Sumino 94, Martinez,
Miquel 03, Seidel,Simon 12
p to NN(N)LO
Threshold scan @ ILC
dMt ≈40 MeV
rum, ISR effects
ization reduces BG events.
2013/12/11 ILC Toku-sui ann. WS 2013
Koji TSUMURA
Mt as an input
G. Degrassi et.al.
To be or not to be.
Our vacuum may be unstable
To confirm our safety,
we need more accurate Mt.
2013/12/11 ILC Toku-sui ann. WS 2013
Unstable
Koji TSUMURA
Beyond the SM
Why ? Where is it ?
2013/12/11 ILC Toku-sui ann. WS 2013
Koji TSUMURA
What is the Beyond SM ?
The SM is now completed.
GUT?
What is the mechanism for charge quantization ?
PQ sym.?
Why does the strong interaction not break CP ?
Seesaw?
What is the correct theory of neutrino mass ?
What is the mechanism that led to baryon asymmetry ?
Leptogenesis?
EW baryogenesis?
What is dark matter ?
WIMP? Axion?
Cosmological const.?
What is dark energy ?
Inflaton?
What was the mechanism of cosmic inflation?
TOE?
How are the four forces and matter unified ?
How can gravity be quantized ? String?
…
viXtra.org
2013/12/11 ILC Toku-sui ann. WS 2013
Koji TSUMURA
No Principle at all !!
Why m2<0 ?
Are there any underlying dynamics ?
Fine-tuning dmh2≈L2 ?
Why is the Higgs so light ?
Minimal Higgs sector ?
Why does the nature choose one doublet ?
2013/12/11 ILC Toku-sui ann. WS 2013
Koji TSUMURA
Dynamical Symmetry Breaking
Why m2<0 ?
Are there any underlying dynamics ?
No reason!!
Dynamics
[ BCS theory for superconductors ]
Attractive force  cooper-pair  symmetry breaking
[ Chiral symmetry breaking ]
QCD  qq condensate  symmetry breaking
2013/12/11 ILC Toku-sui ann. WS 2013
Koji TSUMURA
EW Symmetry Breaking
Why m2<0 ?
Are there any underlying dynamics ?
No reason!!
Dynamics
µ2 =
t
+
t
+
t
Supersymmetry
m2<0 is induced from radiative corrections (dynamically)
2013/12/11 ILC Toku-sui ann. WS 2013
Koji TSUMURA
+ ···
EW Symmetry Breaking
Why m2<0 ?
Are there any underlying dynamics ?
No reason!!
Dynamics
µ2 =
t
+
t/ T
Little Higgs, …
+
T
m2<0 is induced from radiative corrections (dynamically)
2013/12/11 ILC Toku-sui ann. WS 2013
Koji TSUMURA
+ ···
Is the Higgs mass natural ?
Fine-tuning dmh2≈L2 ?
Why is the Higgs so light ?
Quantum corrections to the Higgs mass
Unnatural (cancellation w/ counter terms)
2013/12/11 ILC Toku-sui ann. WS 2013
Koji TSUMURA
Is the Higgs mass natural ?
Fine-tuning dmh2≈L2 ?
Why is the Higgs so light ?
Supersymmetry
SUSY holds naturally light Higgs mass
2013/12/11 ILC Toku-sui ann. WS 2013
Koji TSUMURA
Is the Higgs mass natural ?
Fine-tuning dmh2≈L2 ?
Why is the Higgs so light ?
Little Higgs, …
There can be mixing with partners of Gauge bosons, top quarks.
Top partner
naturally
light Higgs mass
Precision
EW and topholds
studies
are necessary.
2013/12/11 ILC Toku-sui ann. WS 2013
Koji TSUMURA
Non-minimal Higgs sector ?
Most likely to be a doublet,
but possible mixing w/ other multiplets
Additional Higgs bosons are introduced !!
H, A, H+, H++, …
SM-like Higgs couplings deviate from SM
Neutrino mass
Extended Gauge sym.
Singlet
Additional doublet
Triplet
SUSY
…
Septet
…
Not yet thought of
2013/12/11 ILC Toku-sui ann. WS 2013
Koji TSUMURA
Non-minimal Higgs sector ?
Most likely to be a doublet,
but possible mixing w/ other multiplets
M. Peskin (LCWS2013)
Additional Higgs bosons are introduced !!
H, A, H+, H++, …
SM-like Higgs couplings deviate from SM
Singlet
Additional doublet
Triplet
…
Septet
…
At least 1 % precision for M>1TeV (M is a new Higgs scale)
[ pre-factor: loop suppression, tanb enhancement, non-decoupling effect ]
2013/12/11 ILC Toku-sui ann. WS 2013
Koji TSUMURA
Model discrimination
2013/12/11 ILC Toku-sui ann. WS 2013
Koji TSUMURA
So far, No New Physics.
2013/12/11 ILC Toku-sui ann. WS 2013
Koji TSUMURA
SUSY confronts LHC data
Squark
squark
≥ 1.8TeV
~1800GeV
Gluino
≥ 1.4TeV
gluino ~1400GeV
Does ILC discover new particle?
2013/12/11 ILC Toku-sui ann. WS 2013
Koji TSUMURA
means ...
LHC imply that the ILC cannot discover n
direct pair production. That is not corre
foror
particles
withSUSY?
only electroweak inter
Light
Heavy
those cases, the LHC is sensitive only wh
release
in particle
decay is large.
Mind
of SUSY
theorists
Light Supersymmetry
4(2)GeV
muon g-2
Higgs mass
FCNC and MSSM
current SUSY search
Higgs Br
little hierarchy problem
ILC BSM White paper
NMSSM
degenerate
SUSY
R parity
ILC BSM White violation
Paper
2013/12/11 ILC Toku-sui ann. WS 2013
13年11月25日月曜日
Heavy Supersymmery
extra
matter
high scale, split SUSY
Degenerate SUSY
is still alive!!
Lot’s of Model building activity so far
Koji TSUMURA
Non-colored
particles
M. Nojiri
are still targets @ ILC
New Physics Zoo
There are Many Motivations.
But, we don’t know where is it.
Determination of New Scale
is a key issue @ ILC
H. Murayama
2013/12/11 ILC Toku-sui ann. WS 2013
Koji TSUMURA
ILC Physics
2013/12/11 ILC Toku-sui ann. WS 2013
Koji TSUMURA
ILC Physics
Any Deviations
= New Physics
Precision Higgs/top/EW study
•
Model independent determination of Higgs couplings (%-level)
•
Invisible(exotic) Higgs decay / Total width
•
Precise determination of MW (few MeV)
•
Improvement of Triple Gauge coupling measurement
•
Precise determination of Mt (100 MeV)
•
Precision measurement of top coupling (incl. rare decay)
•
Improvement of as @ Giga-Z
•
Higgs self-coupling measurement
(experimental reconstruction of Higgs potential)
Search for New Particles in LHC blind spots
• Light EW new particle (Higgsino, new Higgs, DM)
• Follow up any discovery @ LHC
2013/12/11 ILC Toku-sui ann. WS 2013
Koji TSUMURA
Summary
Any Deviations
= New Physics
Precision Higgs/top/EW study
•
Model independent determination of Higgs couplings (%-level)
Watanuki
•
Invisible(exotic) Higgs decay / Total width
Tomita
Ishikawa
•
Precise determination of MW (few MeV)
•
Improvement of Triple Gauge coupling measurement
Horiguchi
•
Precise determination of Mt (100 MeV)
•
Precision measurement of top coupling (incl. rare decay)
•
Improvement of as @ Giga-Z
Kurata
•
Higgs self-coupling measurement
(experimental reconstruction of Higgs potential)
Search for New Particles in LHC blind spots
• Light EW new particle (Higgsino, new Higgs, DM)
• Follow up any discovery @ LHC
2013/12/11 ILC Toku-sui ann. WS 2013
Koji TSUMURA
Tanabe
Mori
Ono
Kawada
Calancha
Tian
Summary
2013/12/11 ILC Toku-sui ann. WS 2013
Koji TSUMURA
SummaryPlan of my talk
A Higgs boson is confirmed.
STATUS
No New Physics, so far.
Where are we?
Precision measurement of h, t, W/Z.
(Direct search for New Physics).
New Era of the SM
What we need to do?
Indirect search for New Physics.
Higgs forces are totally unknown !!
Physics Beyond the SM
Why? Where is it?
SM is NOT satisfactory…
(v, DM, DE, Baryogenesis, inflation, GUT, string,…)
We don’t know the scale.
ILC Physics
What do we do?
2013/12/11 ILC Toku-sui ann. WS 2013
Determination of New Scale
is a key issue @ ILC.
Koji TSUMURA
Thank you for your attention
2013/12/11 ILC Toku-sui ann. WS 2013
Koji TSUMURA