2014.11.29 talk at LHC meeting (U of Osaka)

1. Yoshitaro
Takaesu
U.
of
Tokyo
LHC
limits
on
the
Higgs-­‐portal
WIMPs
Based
on
arXiv:
1407.6882
in
collabora9on
with
M.
Endo
(U.Tokyo)

2. Portal
models
to
Hidden
Sector
2
Consider
another
world
where
par9cles
are
SM
singlets
(Hidden
Sector).
The
par9cles
interact
to
our
SM
world
through
Gravity.
Also,
they
may
interact
through…
DM
?
HL
FY
µ Xµ
1
fS
Fµ
˜Fµ
S
|H|2
S2
Neutrino
Portal
Vector
Portal
Axion
Portal
Higgs
Portal
Sterile
neutrino
Dark
Photon
Axion-­‐like
par9cle
Higgs
invisible
decay
SM
Hidden
G
In
this
talk,
we
discuss
the
Higgs-­‐portal
possibility.

3. Constraints
on
Higgs-­‐portal
models
3
• Relic
abundance
• Direct
detec9on
• H
Invisible
decay
[Simone,
Giudice,
Strumia:
1402.6287]
Tight
constraints
on
Higgs-­‐portal
“DM”.

4. Constraints
on
Higgs-­‐portal
models
4
• Relic
abundance
• Direct
detec9on
• H
Invisible
decay
[Simone,
Giudice,
Strumia:
1402.6287]
Tight
constraints
on
Higgs-­‐portal
“DM”.
?
If
not
the
DM…

5. Constraints
on
Higgs-­‐portal
models
5
• Relic
abundance
• Direct
detec9on
• H
Invisible
decay
[Simone,
Giudice,
Strumia:
1402.6287]
Tight
constraints
on
Higgs-­‐portal
“DM”.
?
Important
to
know
to
what
extent
LHC
can
explore
the
heavier
Higgs-­‐portal
models.
Heavy
Higgs-­‐portal
WIMP
search
Need
not
to
be
the
DM
Collider
search

6. Higgs-­‐portal
models
discussed
6
Scalar
Vector
AnI-­‐sym.
Tensor
WIMPs
are
SM
singlets.
parity
is
assumed
for
stability
of
WIMPs.
LS =
1
2
µ
S µS
1
2
M2
SS2
cS|H|2
S2
SS4
Z2
Details
of
these
spin-­‐1
models
(UV
comple9on
etc.)
will
not
be
discussed
in
this
talk.
(cf.
Y.Farzan,
A.R.Akbarieh
(2012)
S.Beak,
P.Ko,
W.Park,
E.Senaha
(2013)
)
[A.
Djouadi
et
al.1205.3169,
S.Kanemura
et
al.1005.5651
]
[O.Cata,
A.
Ibarra:
1404.0432]
m2
B = M2
B + 4cBv2
m2
V = M2
V + 2cV v2
m2
S = M2
S + 2cSv2 aher
EWSB
LV =
1
4
V µ⌫
Vµ⌫ +
1
2
M2
V V µ
Vµ + cV |H|2
V µ
Vµ + · · ·
LB =
1
4
@ Bµ⌫
@ Bµ⌫
1
2
@µ
Bµ⌫@⇢B⇢⌫ 1
4
M2
BBµ⌫
Bµ⌫
cB|H|2
Bµ⌫
Bµ⌫ + · · ·

7. 8TeV
LHC
limits
for
Heavy
Higgs-­‐portal
WIMP
7

8. LHC
searches
considered
8
VBF
Mono
Z
Mono
jet
CMS:
1408.3583
(Signal
event
limit)
ATLAS:
PRD
90
012004
(2014)
(Fid.
Xsec
limit)
CMS:
EPJC
74
(2014)
2980
(Br_inv
limit)
• 8TeV
MET
Dark
Maler
search
• Cut-­‐based
analysis
*
Cut
acceptances
are
es9mated
by
LO
events
with
MG5+pythia+Delphes.
*
Other
channels
such
as
l~+MET
may
have
comparable
sensi9vity,
but
will
not
be
considered
here.
NLO
QCD+EW
(HAWK)
NLO
QCD+EW
(HAWK)
NLO
QCD
(MCFM)
Channel:
Analysis:
Signal
Xsec:
Signal
process:

9. 0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ [GeV]
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ [GeV]
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ [GeV]
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ [GeV]
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ [GeV]
VBF
Mono-jet
Mono-Z
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ [GeV]
Limits
for
the
Heavy
Higgs-­‐portal
WIMPs
9
Vector
*
Limits
for
large
coupling
may
not
be
valid
due
to
unitarity
(or
break
down
of
perturba9ve
calcula9on),
depending
on
UV
models.
L =
1
4
Vµ⌫V µ⌫
+
1
2
m2
BVµV µ
+ cB|H|2
VµV µ
+ · · ·
Excluded
by
Higgs
invisible
decay
• VBF
sets
the
strongest
limits.
• Coupling
>
~0.5
can
be
constrained
by
8TeV
LHC.

10. 0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ [GeV]
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ [GeV]
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ [GeV]
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ [GeV]
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ [GeV]
VBF
Mono-jet
Mono-Z
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ [GeV]
Ωh2
= 0.01
0.001
10-4
10-5
10-6
10-7
10-8
Limits
for
the
Heavy
Higgs-­‐portal
WIMPs
10
Vector
L =
1
4
Vµ⌫V µ⌫
+
1
2
m2
BVµV µ
+ cB|H|2
VµV µ
+ · · ·
*
Relic
abundance
lines
are
drawn
just
as
a
physical
measure
of
coupling
strength.
*
Thermal
freeze
out
is
assumed.
LHC
probes
WIMPs
with
very
small
relic
abundance.

11. Limits
for
the
Heavy
Higgs-­‐portal
WIMPs
11
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ
[GeV]
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ
[GeV]
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ
[GeV]
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ
[GeV]
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ
[GeV]
VBF
Mono-jet
Mono-Z
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ
[GeV]
Ωh
2
= 0.01
0.001
10-4
10-5
10
-6
10-7
10
-8
Tensor
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ [GeV]
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ [GeV]
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ [GeV]
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ [GeV]
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ [GeV]
VBF
Mono-jet
Mono-Z
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ [GeV]
Ωh2
= 0.01
0.001
10-4
10-5
10-6
10-7
10-8
Vector
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ
[GeV]
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ
[GeV]
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ
[GeV]
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ
[GeV]
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ
[GeV]
VBF
Mono-jet
Mono-Z
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ
[GeV]
Ωh2
= 0.01
0.001
10-4
10
-5
10-6
10-7
10-8
Scalar
• VBF
puts
the
strongest
limit
for
any
WIMP
model.
• An9-­‐sym.
tensor
WIMP
get
similar
(stronger)
constraints
as
vector
WIMP.
• Constraints
on
scalar
WIMP
is
very
weak.

12. 14
TeV
LHC
prospects
12

13. Naive
projecIon
from
8TeV
-­‐>
14TeV
13
We
need
to
know
and
to
es9mate
the
14
TeV
constraints
on
.
Nlim
sig
cc2
(m ) <
Nlim
sig
(m , c = 1)L
is
roughly
es9mated
as
following:
Nlim
sig
95%
CL
(simple
Gaussian)
Rela9ve
does
not
improve
Rela9ve
reduces
as
.
1/ NBG
is
es9mated
by
theore9cal
calcula9ons
with
experimental
cuts.
sys
stat stat
NBG 14TeV
=
N8TeV
BG
N14TeV
BG
stat
NBG 8TeV
Nlim
sig 2 tot
tot = 2
sys + 2
stat
sys
NBG 14TeV
=
sys
NBG 8TeV
Missing
ET
cut
@14TeV:
>
450
GeV
(Mono
Z),
>
400
GeV
(Mono
jet)
>
130
GeV
(VBF)
is
es9mated
by
simula9on
(MG5+pythia+Delphes).
N14TeV
BG /N8TeV
BG

14. 0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ
[GeV]
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ
[GeV]
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ
[GeV]
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ
[GeV]
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ
[GeV]
VBF
Mono-jet
Mono-Z
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ
[GeV]
Ωh2
= 0.01
0.001
10-4
10
-5
10-6
10-7
10-8
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ
[GeV]
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ
[GeV]
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ
[GeV]
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ
[GeV]
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ
[GeV]
VBF
Mono-jet
Mono-Z
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ
[GeV]
Ωh
2
= 0.01
0.001
10-4
10
-5
10-6
10
-7
10
-8
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ
[GeV]
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ
[GeV]
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ
[GeV]
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ
[GeV]
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ
[GeV]
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ
[GeV]
VBF
Mono-jet
Mono-Z
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ
[GeV]
Ωh
2
= 0.01
0.001
10-4
10-5
10
-6
10-7
10
-8
14TeV
LHC
SensiIvity
@
100
V^-­‐1
14
Tensor
Vector
Scalar
•
LHC
will
constrain
Tensor
(Vector)
coupling
of
>
0.1
(0.3)
(relic
abundance
of
<
0.01).
• Scalar
Higgs-­‐portal
WIMP
limit
is
s9ll
very
weak…

15. 8TeV
LHC
Limits
15
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ [GeV]
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ [GeV]
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ [GeV]
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ [GeV]
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ [GeV]
VBF
Mono-jet
Mono-Z
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ [GeV]
Ωh2
= 0.01
0.001
10
-4
10-5
10-6
10
-7
10
-8
Tensor
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ [GeV]
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ [GeV]
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ [GeV]
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ [GeV]
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ [GeV]
VBF
Mono-jet
Mono-Z
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ [GeV]
Ωh2
= 0.01
0.001
10-4
10
-5
10-6
10
-7
10
-8
Vector
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ
[GeV]
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ
[GeV]
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ
[GeV]
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ
[GeV]
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ
[GeV]
VBF
Mono-jet
Mono-Z
0.1
0.2
0.5
1
2
5
10
50 100 150 200 250 300 350
cχ
mχ
[GeV]
Ωh
2
= 0.01
0.001
10
-4
10
-5
10
-6
10
-7
10
-8
Scalar

16. Summary
16
LHC
constraints
on
the
Heavy
Higgs-­‐portal
models
have
been
discussed.
8
TeV
LHC
can
constrain
Higgs-­‐portal
couplings
below
1
for
the
vector
and
tensor
case.
Limit
on
Scalar
model
is
very
weak.
14
TeV
LHC
can
be
sensi9ve
to
O(0.1)
couplings
of
vector
and
tensor
models.
Limit
on
Scalar
model
is
s9ll
very
weak.
VBF
channel
puts
stronger
limits
on
Higgs-­‐portal
models
than
Mono-­‐jet
and
Mono-­‐Z
channels.

17. 17

18. 18