Studies of Higgs Boson Properties
in Future LHC Runs
Moriond QCD & High Energy Interactions, March 23, 2014
Hideki Okawa (Brookhaven National Laboratory)
on behalf of the ATLAS & CMS Collaborations
LHC Program
LHCC open meeting, Dec. 2013
LHC 13-14 TeV (2015-2022)
•
•
•
√s=13-14 TeV.
Will surpass the
design luminosity in
Run 2. Twice the
design lumi. in Run 3.
Expected integ. lumi.
~300 fb-1
HL-LHC 14 TeV (2025-2030s)
•
•
√s=14 TeV.
2009
2010
2011 Run 1
2012
2013
2014 LS1
2015
2016
Run 2
2017
2018
2019 LS2
2020
2021 Run 3
2022
2023
2024 LS3
2025
Run
2035 4,5,...
LHC start-up, √s=900 GeV
~25 fb-1
√s=7-8 TeV, L~6×1033 cm-2s-1, bunch spacing=50 ns
Towards the design energy & luminosity
√s=13 TeV commissioning
√s=13-14 TeV, L~1.6×1034 cm-2s-1, bunch space=25 ns
~75100 fb-1
LHC Injector upgrade
√s=14 TeV, L~2×1034 cm-2s-1, bunch space=25 ns
~300 fb-1
HL-LHC upgrade; interaction region,
crab cavities?
√s=14 TeV, L~5×1034 cm-2s-1
~3000
fb-1
σ(Higgs@LHC) > 50 pb w/ √s=14 TeV,
cf. σ(Higgs@e+e-)~ 0.2-0.3 pb w/ √s=250-500 GeV
The luminosity will increase by a factor 5 from the initial design. Expected
integ. lumi.~250-300 fb-1/year & ~3000 fb-1 after a decade of operation.
Hideki Okawa
Moriond QCD & High Energy Interactions
2
the predictions in Refs. [13], including the error estim
identified and removed inconsistencies in the calcula
corresponding changes in the error estimate are at th
mH > 500 GeV the changes increase for some deca
values of the BRs are not affected.
Higgs Physics@Future LHC
The fermionic decay modes are shown in Tab
together with the total width are given in Table A.8 to
full uncertainty) is also presented graphically in Figur
mass range (right).
10-1
Search for BSM decays (invisible, t→cH)
WW
bb
gg
ττ
ZZ
cc
10-2
Search for CP-violation in the Higgs-sector
Higgs BR + Total Uncert [%]
•
•
•
•
Sensitivities to rare decays: H→μμ, Zγ
1
LHC HIGGS XS WG 2013
•
Higgs Yellow Report
Higgs BR + Total Uncert [%]
•
Precision measurements of Higgs couplings
1
1
γγ
Zγ
10-3
1
Search for additional Higgs bosons
µµ
Higgs boson pair production & self-coupling
10-4
80
100
120
140
160
180
1
200
MH [GeV]
Fig. 2: Higgs branching
ratios and their uncertainties for
ATL-PHYS-PUB-2013-007
(right).
2.1.3
λHHH
BR Correlations for Higgs masses close to 12
In this section, we focus on the error correlations for th
two-fold: Varying the input parameters within their er
widths and the resulting BRs in a correlated way. Mor
5
Hideki Okawa
Moriond QCD & High Energy Interactions
3
Projections
•
•
Benchmarks: √s=14 TeV. 300 fb-1 (3000 fb-1), μ=60 (140) for LHC (HL-LHC)
•
CMS: 7 & 8 TeV results are extrapolated to 300 or 3000 fb-1 at √s=14 TeV assuming
μ: average number of p-p interactions per bunch crossing.
ATLAS: Dedicated MC samples with response functions given for the expected
detector & object performance for benchmark scenarios; or extrapolated the 7 & 8 TeV
results. Response functions are applied to the MC truth distributions.
the same detector & trigger performance.
Emiss
x,y Resolution
μ-dependent Missing ET resolution
160
ATLAS Simulation Preliminary
25 ns bunch spacing
140
CMS Systematics
•
Scenario 1: same systematics as Run 1 (w/ & w/o
theory uncertainties)
•
Scenario 2: theory systematics 50%, experimental
systematics scaled by √(integ. lumi.).
Parametrisation
Z’
120
t t, µ = 60,
MinBias, µ = 60,
100
J3, µ = 60,
pile-up
(µ=60), calib.
noise
pile-up
pile-up
noise
noise
(µ=60), calib.
(µ=60), calib.
80
•
60
40
20
0
•
1000
Hideki Okawa
2000
ATL-PHYS-PUB-2013-007, ATL-PHYS-PUB-2013-009
3000
4000
5000 6000
ET [GeV]
ATLAS Systematics
•
Basically the same as Run 1. Some uncertainties
from data-driven estimates are scaled with √(integ.
lumi.) w/ & w/o theory uncertainties.
Moriond QCD & High Energy Interactions
4
Higgs Measurements
ATL-PHYS-PUB-2013-007, ATL-PHYS-PUB-2013-014
Can measure all the
production modes w/ 3000 fb-1
6
ATLAS Simulation Preliminary
∫ L=3000fb-1, s = 14 TeV
5
ttH-like category
4
3
2
ttH,H→γγ
Events/GeV / 3 ab-1
Entries/1GeV
H→ZZ→4l
VBF
WH
ZH
ttH
ggF
Background
300
250
200
∫
-1
L dt = 3000 fb
150
50
0
ween 115 and 130 GeV.
0 The total uncertainties on the corresponding estimates are also given. Fig100
100
105
110
115
120
125
130
135
140
3 shows the invariant mass distributions of the lepton quadruplets coming from the various Higgs
duction mechanisms and background for the di↵erent category
selections.
m4l[GeV]
Category
ttH-like
ZH-like
WH-like
VBF-like
ggF-like
ttH
WH
ZH
VBF
gg
Z
W
diphoton
ttbar
ATLAS Simulation
100
1
ggF
3.1 ±1.0
0.0
22 ±7
41 ±14
3380 ±650
Sensitive to Top Yukawa coupling
from both production & decay
VBF
0.6 ±0.1
0.0
6.6 ±0.4
54 ±6
274 ±17
True Origin
WH
ZH
0.6 ±0.1
1.1 ±0.2
0.01 ±0.01 4.4 ±0.3
25 ±2
4.4 ±0.3
0.7 ±0.1
0.4 ±0.1
77 ±5
53 ±3
ttH
30 ±6
1.3 ±0.3
8.8 ±1.8
1.0 ±0.2
25 ±4
Background
1.6 ±1.0
0.06 ±0.06
13 ±0.8
4.2 ±1.5
2110 ±50
•
110
120
130
140
150
diphoton mass [GeV]
More than 100 ttH,H→γγ signal
events could be observed with
3000 fb-1.
ble 1: Mean expected number of events in each category assuming mH = 125 GeV and 3000 fb 1 of
a. For
each category,
various Higgs
Hideki
Okawathe expected number of events from the
Moriond
QCDproduction
& Highmechanisms
Energy Interactions
pecified. Estimates are given in the lepton quadruplet mass interval between 115 and 130 GeV, along
5
CMS Projection
CMS Projection
Rare Decays & Signal Strength
Expected uncertainties on
Higgs boson couplings
-1
300 fb at
s = 14 TeV Scenario 2
κW
κZ
κZ
g
κt
κτ
H→μμ: 7.0σ significance w/
3000 fb-1 w/ ATLAS. Probe
coupling0.05
dependence
on0.15
0.00
0.10
expected uncertainty
lepton-flavor.
Events / 0.5 GeV
κW
κb
3000 fb-1 at
s = 14 TeV Scenario 1
3000 fb-1 at
s = 14 TeV Scenario 2
κγ
Rare
Decays
κ
•
Expected uncertainties on
Higgs boson couplings
s = 14 TeV Scenario 1
ATL-PHYS-PUB-2013-014,
CMS NOTE-13-002
×10
3
Events / GeV
κγ
-1
300 fb at
g
1010 κATLAS
Simulation Preliminary
κsb = 14 TeV
109
-1
H
µµ, m =125 GeV
H
κ tL dt = 3000 fb
8
Z
µµ
10
κτ
tt
7
WW µ µ
10
0.00
6
10
0.05
120
Background
SM Signal
B-only fit
100
s = 14 TeV
80
∫ Ldt = 3000 fb
-1
60
40
0.10
ATLAS Simulation
Preliminary
20
H→μμexpected uncertainty
H→Zγ
5
10
0
•
80
investigate the loop structure.
100 120 140
200
1000 25
800
600
400
200
0
-200
-400
25
30
30
35
35
mµµ [GeV]
ATLAS Simulation Preliminary
40
45
50
55
60
mllγ -mll [GeV]
40
45
50
55
60
mllγ -mll [GeV]
CMS
s = 14
TeV: Projection
Ldt=300 fb-1 ; Ldt=3000 fb-1
Expected uncertainties on
Higgs boson signal strength
3000 fb-1 at
s = 14 TeV Scenario 1
3000 fb-1 at
s = 14 TeV No Theory Unc.
H µµ
Scenario 1:
same systematics
as Run 1
H → WW
H → ZZ
Same systematics
as Run 1, but w/o
theory unc.
H → bb
H→ τ τ
0.10
0.15
expected uncertainty
(VBF-like)
κW
H
ZZ
H
WW (comb.)
H
Z
Signal Strength
•
hashed: w/
current
theory unc.
(comb.)
κZ
κg
κb
κ(incl.)
t
1.5
κτ
H
0.05
Expected uncertainties on
Higgs boson couplings
(comb.)
κγ
H
H→ γ γ
0.00
160 180
(Events - Fit) / GeV
Figure 12: Estimated
precision on the measurements
of kg , kW , k Z , k g , kb , kt and kt . The pro104
p
H→Zγ: s2.1σ
w/
jections assume
= 14significance
TeV and an integrated
dataset
of 300 fb 1 (left) and 3000 fb 1 (right).
103
-1 w/ ATLAS. Can
3000 fb
The projections
are obtained
with the two uncertainty
scenarios described in the text.
102
CMS Projection
H→Zγ , Z→µµ/ee
0.15
(comb.)
0.00
0
0.05
0.2
0.4
µ/ µ
•
3000 fb-1 at
s = 14 TeV Scenario 1
3000 fb-1 at
s = 14 TeV No Theory Unc.
Signal strength of main
channels (H→γγ, H→ZZ, H→WW,
H→ττ, H→bb) could be measured
within ~5% (~10%) without
(with) theory uncertainties.
Similar0.15
precision between
expected
uncertainty
ATLAS/CMS
0.10
Hideki13:
Okawa
Moriond
QCD
& High(left)
Energy
Interactions
Figure
Estimated precision
on
the
signal
strengths
and
coupling modifiers (right).
p
6
0.00
0.05
0.10
0.15
0.00
expected uncertainty
0.05
0.10
0.15
expected uncertainty
Higgs Coupling Fit
Figure 12: Estimated
prop precision on the measurements of kg , kW , k Z1, k g , kb , kt and kt . The
jections assume s = 14 TeV and an integrated dataset of 300 fb (left) and 3000 fb 1 (right).
The projections are obtained with the two uncertainty scenarios described in the text.
ATL-PHYS-PUB-2013-014, CMS NOTE-13-002
Higgs couplings are extracted from σ × BR assuming
CMS Projection
that total width Γtot equals the sum of SM channel widths
( · BR)(i
Expected uncertainties on
Higgs boson signal strength
ff) =
H
i
·
3000 fb-1 at
-1
3000 fb at
ff
CMS Projection
Expected uncertainties on
Higgs boson couplings
s = 14 TeV Scenario 1
s = 14 TeV No Theory Unc.
κγ
tot
i: Higgs production process, f: Higgs decay product
H→ γ γ
•
κZ
κg
H → ZZ
Coupling could be measured within ~5%
H → bb
(~10%) without (with) theory uncertainties.
H→ τ τ
s = 14 TeV Scenario 1
3000 fb-1 at
s = 14 TeV No Theory Unc.
Scenario 1:
same systematics
as Run 1
κW
H → WW
3000 fb-1 at
Same systematics
as Run 1, but w/o
theory unc.
κb
κt
Energy Frontier
κ
τ
•
0.05
0.10
0.15
expected uncertainty
F
Minimal coupling fit 0.00
with a universal
couplings
0.05
0.10
0.15 to
0.00
expected
uncertainty
be in this situation,
in which the
picture of
the
Higgs boson
may
be very
di↵erent from that in the
weak
vector
bosons
&
fermions
is
also
provided.
since the other particles in the sector are heavy, it is difficult to conclude this except by precision
Figure 13: Estimated precision
on the signal strengths
(left)
coupling
modifiers (right).
1.4
Best Fit and
Standard
Model
p
1 and Scenario 1 are
w/ theory
w/o theory
-1an
The
projections
assuming
s 3000
= 14 TeV,
integrated
dataset
of
3000
fb
Sensitive
to
various
BSM
models
w/
fb
.
sizes of Higgs boson coupling modifications are shown in Table 3-1. More details of these1.3estimates68% CL
95% CL
compared
with
a
projection
neglecting
theoretical
uncertainties.
in [23].
ment.
•
Snowmass, Energy Frontier Report, 2013
Model
V
b

1.2
1.1
4.5 Spin-parity
1
Singlet Mixing
⇠ 6%
⇠ 6%
⇠ 6%
2HDM Besides testing
⇠ 1% Higgs⇠couplings,
10%
⇠it1%
0.9 determine the spin and quantum numbers
is important to
Test of universal coupling
Decoupling MSSM
1.6%
<as
1.5%
Simulation Preliminary
of the ⇠
new0.0013%
particle as⇠accurately
possible. The
full
casevector
study
has been
presented
by CMS
0.8 to weak
bosons
vs ATLAS
s = 14 TeV, Ldt = 3000 fb
Compositewith the ⇠example
3%
⇠ separation
(3 9)% ⇠
9% SM Higgs boson model
fermions
of
of the
and the pseudoscalar
(0 ) [7].
-1
0.7
0.95 boson1 are presented
1.05
1.1 the
Top Partner
⇠ the
2% prospects
⇠ 2%
⇠ +1% CP-mixing0.9
Studies on
of measuring
of the Higgs
using
H! ZZ ⇤ ! 4l channel. The decay amplitude for a spin-zero boson defined as
e 3-1. Generic size of Higgs coupling modifications from the Standard Model values in classes of new
Hideki Okawa
Moriond QCD & High
Interactions
⇣ Energy
⌘
cs models: mixing of the Higgs boson with a singlet boson, the two-Higgs doublet
model, the Minimal
⇤(
1
)
⇤(
1
)
1
2 ⇤ ⇤
⇤(2),µn
˜⇤(2),µn
V
7
BSM Rare Decays (invisible)
ATL-PHYS-PUB-2013-014, ATL-PHYS-PUB-2013-015, CMS NOTE-13-002
χ
From ZH→ll+invisible
ATLAS
χ
H
Z
Z
"−
q
"+
•
•
•
CMS
CMS
300 fb-1 [25,28]% [14,18]%
Higgs-Portal Interpretation
-1 [12,15]% [7,11]%
3000 fb-1 [8,16]% BR(H→inv)
[6,17]%
limit could be3000
mapped fb
to bounds
on the coupling of Higgs-dark
matter (DM) & DM-nucleon cross section for Higgs-portal DM models
Higgs invisible decay
SM invisible decay:
BR(H→ZZ(*)→4v)=0.12%
fb-1
With 3000
of data, sensitivity
reaches BR(invisible) < 10%.
Similar sensitivity from coupling
measurements.
(h
BR(h
10-38
10-39
10-40
10-41
10-42
10-43
10-44
10-45
10-46
10-47
10-48
10-49
10-50
10-51
10-52
)=
1
Higgs-DM coupling
)
(h
(h
)
) + (h
10-38
10-39
10-40
10-41
10-42
10-43
10-44
10-45
10-46
10-4710
10-48
10-49
10-50
10-51
10-52
DM-nucleon xsec
2
h
N
SM )
ATLAS Simulation Preliminary
ZH
ll+invisible
Higgs-portal Model for ATLAS
Hideki Okawa
Outstanding sensitivity for low-mass
dark matter within Higgs-portal models.
Hideki Okawa
ATLAS
300 fb-1 [23,32]% [17,28]%
DM-Nucleon cross-seciton [cm2]
•
From couling measurements
DM−Nucleon cross section [cm2]
q
Higgs-portal
Ldt=3000 fb-1
s=14 TeV, Model
Scalar
XENON 10
XENON 1T
CRESST
CDMS 1
ATLAS 3000 fb -1, scalar DM
ATLAS 3000 fb -1, majorana DM
XENON 100
DAMA/LIBRA
CDMS 2
CoGeNT
ATLAS 3000 fb -1, vector DM
Majorana
102
103
DM Mass [GeV]
•
Very good sensitivity in mχ<mH/2
region.
ZH → ll+invisible
ATLAS Simulation Preliminary
s = 14 TeV, ∫ Ldt=3000 fb
-1
•
Significantly exceeds the limits from
the direct detection experiments for
the low mass region.
•
LHC could provide complementary
results to the DM experiments.
Vector
USLUO Annual Meeting, November 8, 2013
DAMA/LIBRA 3σ
CDMS 95% CL
XENON10
XENON 1T
-1
-1
ATLAS 3000 fb , vector DM
1
Moriond
QCD
& High
Energy
Interactions
Moriond
QCD
& High
Energy
Interactions
10
8
CRESST 2σ
CoGeNT
XENON100
-1
ATLAS 3000 fb , scalar DM
ATLAS 3000 fb , majorana DM
102
103
DM Mass [GeV]
88
BSM Rare Decays (t→cH)
H
t
γ
2500
ATLAS Simulation
2000
Preliminary
tt
cH( )bW(had)
1
CLS
γ
events / 5 GeV
ATL-PHYS-PUB-2013-012
-1
Expected, tight jet p cuts
T
Expected, tight jet p cuts, conservative bkg
Full simulation, 8 TeV
T
Truth level 8 TeV
Truth level 14 TeV
1500
ATLAS Preliminary
L dt = 3 ab , s = 14 TeV
Expected, loose jet p cuts
T
Expected, loose jet p cuts, conservative bkg
-1
10
T
1000
10-2
500
c
0
0
50
100 150 200 250 300 350 400 450 500
diphoton-jet mass [GeV]
-3
10 1
1.5
2
2.5
Br(t
•
Seach for flavor-changing neutral currents in top decays using ttbar
processes. Look for peak at γγj invariant mass & W(→lv, jj)j.
•
SM value is BR(t→cH) = 3×10-15. For BSM, BR(t→cH) could be
enhanced to ~10-5−10-3.
•
With 3000 fb-1, the expected limit reaches BR(t→cH)=1.2−1.4×10-4
Hideki Okawa
Moriond QCD & High Energy Interactions
3
cH) (x104)
9
CP-mixing
Spin-parity
18
(
)
(H→ZZ * →4l)
5
Discovery Potential: Supersymmetry
des testing Higgs couplings, it is important to determine the spin and quantum n
Table 4: Estimated precision on the measurements of ratios of Higgs boson couplings (plot
he new
particle
as
accurately
as
possible.
full case
study
has
been
b
multiple
Higgs
boson
CPThe
violation
can
lead
tobythe
125
GeVpresented
Higgs
ratio of partial
width.
It will be&replaced
by a plot of ratio
of couplings
the
time
of
• Presence ofshows
p
the
pre-approval.
Uncertainties
are
1/2).
These
values
are
obtained
at
s = 14 TeV using
as an admixture
of CP-scalar
and
pseudoscalar
state.
h the example
of separation
of
the
SM
Higgs
boson
model
and the pseudoscalar (
an integrated dataset of 300 and 3000 fb . Numbers in brackets are % uncertainties on the
measurements
estimated under [scenario2,
scenario1],of
as described
in the text. boson are presented us
dies on the prospects
of measuring
CP-mixing
the Higgs
Provides a new
L (fbsource
) k · k of
/ kCPk violation
/k
k /k beyond
k /k
k SM.
/k
k /k
k /k
k /k
k /k
•
⇤
ZZ ! 4l channel.300The decay
amplitude
for [6,9]
a spin-zero
boson
as
[4,6]
[5,8]
[4,7]
[8,11]
[6,9] [13,14]
[22,23] defined
[40,42]
([6,8]
[2,5]tests
[2,5]
[2,3]
[3,5]
[2,4] H→ZZ
[3,5]
Most3000
precise
available
with the
*)→4l [7,8]
final [12,12]
state CMS NOTE-13-002
⇣
⌘
Projections of the expected
2 ln2L values
⇤(assuming
1) ⇤(2)300
1
⇤ ⇤ from the fits
,µnfb and 3000⇤(fb1) are
A( H !shown
ZZin)Fig.
=15.vA 68% (95%)
a1 mCLZlimit
e1 eon2 the
+contribution
a2 f µn off f can be achieved
+ a3 fatµnthe level
f˜⇤(2),µn .
1
1
g
Z
H
g
Z
W
Z
b
Z
t
Z
Z
g
t
g
µ
1
1
•
Zg
Z
1
a3
of 0.07 (0.13) with 300 fb and 0.02 (0.04) with 3000 fb . The analysis is limited by statistical
uncertainties up to a high
luminosity,
but all sources
of systematic
uncertainties
are preserved
loop
CP-even
SM
tree process
CP-odd
contributions
in the projections.
contributions
(BSM)
1
ATLAS uses 8D fit with
kinematic variables to
extract ɑ2 and ɑ3 (=-2g4).
4
(g )/g
•
1
Z
2
ATLAS Simulation Preliminary
1.5
8D Fit: g /g
4
1
1
ɑ3: coupling to CP-odd contributions
CMS uses Matrix
Element likelihood
approach.
ATLAS: fa3< 0.15 (0.037)
CMS: fa3< 0.13 (0.04)
w/ 300 fb-1 (3000 fb-1)@95%CL
Hideki Okawa
0.5
0
fa3: fraction of
CP-odd
contributions
-0.5
-1
-1.5
3000 fb-1: 68%-95%CL
300 fb-1: 68%-95% CL
-2
-2 -1.5 -1 -0.5 0
0.5
1 1.5
CMS NOTE-13-002
ATL-PHYS-PUB-2013-013
Figure 15: Distribution of expected 2 ln L for f a3 for the projection to 300 fb 1 (green, dotted)
Moriond
QCD & High Energy Interactions
and 3000 fb 1 (magenta,
dot-dashed).
2
(g )/g
4
1
10
alues. Spontaneous
symmetry breaking leads to mixing between the singlet state and surviving state of
formance
of this channel.
he doublet field, resulting in two CP-even Higgs bosons, where h (H) denotes the lighter (heavier) of
300 fb−1They couple to fermions
3000 fb−1
he pair. The two Higgs bosons, h and H, are assumed Coupling
to be non-degenerate.
theory
unc. Allreduced
unc. Noby
theory
roweak
singlet
nd vector bosons
in a similar way to that of the SM Higgs boson,All
butunc.
eachNo
with
a strength
a un
κH IV 0.35
0.31
0.25
Type
I scale factor,
Typedenoted
II
III
Type
ommon
κh and Type
κH respectively.
The
constraint
of unitarity0.31
implies that
the SM Higgs sector involves the addition of an electroweak (EW) singlet
(β − α)
sin(β − α)
sin(βTable
− α)1: Expectedsin(β
− upper
α) limit on κH with 300 and 3000 fb−1 at √ s = 14 T
95% CL
2
2
t Higgs field of the SM. Both fields acquire
non-zero
vacuum
expectation
κ
+
κ
=
1.
(1)
and
without
the
inclusion
of
theoretical
uncertainties in the coupling measurements
H cos(α)/
h singlet
α)/ sin(β)
cos(α)/ sin(β)
cos(α)/ sin(β)
sin(β) An additional
(1)
Additional
electroweak
(EW)
(“H”):
singlet
couples
to
etry breaking leads to mixing between the singlet state and surviving state of
α)/
sin(β)
− sin(α)/
cos(β)
cos(α)/
sin(β)
−the
sin(α)/
cos(β)
bosons
& fermions
as
a SM
Higgs
boson
with
mass
mH (not
degenerate with the 125
in two
CP-even
bosons,
where
h (H)
denotes
lighter
(heavier)
In this
model,Higgs
the lighter
Higgs
boson
h has
identical
decay modes
to of
those of the SM Higgs boson,
α)/
sin(β)
− sin(α)/
cos(β)todenoted
− non-degenerate.
sin(α)/
cos(α)/
sin(β)
GeV
Higgs
boson
as cos(β)
“h” here).
Coupling
strength
is reduced by a
sons,
h
and
H,
are
assumed
be
They
couple
to
fermions
ut with production and decay rates modified
according
to
all new decay modes, BRH,new , as
common
scale
factor
(κ
or
h
H). with a strength reduced by a
lar way to that of the SM Higgs boson, but κeach
2 ×σ
ght Higgs boson h to weak vector bosons (κV ),=up-type
2 × σquarks (κuσ),H down-type
=
κ
H,SM
κimplies
H
ed κh and κH respectively. The constraintσofh unitarity
that
h,SM
h
BSM Higgs Bosons
•
), expressed asUnitarity
ratios to
the corresponding SM expectations.
Constraint
2×Γ
Γ
=
κ
2
2
h,SM
h
h
κ + κ = 1.
h
H
ΓH
κ2H
=
× ΓH,SM
(1)
1 − BRH,new
(2)
BRvh,i respectively,
= BRh,SM,iwith their
BRH,i
= being
(1 − BRH,new ) × BRH,SM,i
quire
vacuum
expectation
values,
v
and
ratio
1
2
er Higgs boson h has identical decay modes to those of the SM Higgs boson,
2 + v2 = v2 = (246 GeV)2 . The Higgs sector of the
Unitarity
requires
that
v
Here σΓH,SM
, ΓH,SMthe
, andtotal
BRH,SM,i
denote
the cross
section, total
width, and branch
cay rates
modified
where
σ denotes
theaccording
production
denotes
decay
width,
BR denotes
the branching
1 to 2cross section,
decay mode
(indexed
predicted
a SM m
Higgs
± ),boson with mass mH .
ribed
byTwo
parameters:
fourdecay
Higgs
boson
masses
(mi)h ,SM
mHHiggs
, mAfor, and
His
atio,
and
isix
indexes
the different
modes.
(2)
Higgs
Doublet
Models
(2HDM):
sector
extended
by
an
2
Consequently
the
overall
signal
strength,
namely
the
ratio
of
the
overall rate of p
σ
=
κ
×
σ
h
h,SM
e α For
of the
two
neutral,
CP-even
Higgs
states.
A
discrete
Z
symmetry
[26]
is
2
h
theadditional
heavier Higgs
boson
H, new model
decay
modes
such
asrelative
H → to
hh
areofpossible
if masses:
they are
doublet.
Generic
with 6measured
parameters
(4that
Higgs
boson
mh,
in
the channels
a SM
Higgs
boson
withkinematcorresponding
m
2
meteraccessible.
m12
the
Higgs
potential
is zero.
Gauge
fixes
the couplings
cally
case
production
and
are
modified
with respect
to those
= ; tan
κh ×β;its
Γh,SM
mHin, Γm
mthis
mixing
angle
of decay
h invariance
& H:rates
α). Includes
MSSM
for Type
II. of a SM
(2)
H±
h A,In
σh × BR
h the branching
n Higgs
bosons
bosons
relative
to heavy
their SM
values
to
be
Higgs
boson
withtoa vector
mass equal
to that
of the
Higgs
boson
as
a
function
of
ratio ofType
=Type
κ2 II
Coupling strengthµh = Type I
•
BRh,i = BRh,SM,i
(σh × BRh )SM
h
κV
sin(β − α)
sin(β − α)
sin(β −
tion cross section, Γ denotes the total decay width, BR denotes
the branching
κu
cos(α)/σsin(β)
cos(α)/
s
(5)H cos(α)/2 sin(β)
!
"
H × BR
2HDM /gSM
µH =
= κH 1 − BRH,new
=
cos(β
−
α)
erent decay gmodes.
κ
cos(α)/
sin(β)
−
sin(α)/
cos(β)
cos(α)/ s
(σH × BRH )SM
HVV
d
HVV
oson H, new decay modes such as H → hh are possibleκl if they are cos(α)/
kinematsin(β) − sin(α)/ cos(β) − sin(α)/
for h and
H respectively.
2
denote
the
SM
Higgs
couplings
to
vector
bosons.
se
its
production
and
decay
rates
are
modified
with
respect to those of a SM
V
As given in model 1 of Table 18 in Ref. [10], the expected precision on κh impro
Table
2:
Couplings
of theratio
lightofHiggs boson
h√to weak vector bosons
11
Hideki
Okawa
QCD
& High
Energy
Interactions
gqual
condition
is the
satisfied
fourboson
typesMoriond
of(2.5%)
−1
−1
to that
of
heavyby
Higgs
as
a2HDMs:
function
of
the
branching
with 300 fb to 2.5% (1.6%) with 3000 fb at s = 14 TeV with (with
SM
g2HDM
/g
hVV
hVV
= sin(β − α)
BSM Coupling Studies
H→γγ, H→ZZ→4l, H→ Zγ, H→WW→lvlv, H→ττ, H→μμ channels used
ATL-PHYS-PUB-2013-015
Additional electroweak singlet (“H”)
•
•
w/o theory uncertainty
Precision of κh improved by 3.2% (2.5%) with 300 fb-1 & 2.5% (1.6%) with 3000 fb-1.
Scale factor for another EW singlet is excluded as κH < 0.35 (0.31) with 300 fb-1 &
κH < 0.31 (0.25) with 3000 fb-1 at 95% CL.
4
3.5
3
Expected 95% CL Limit
ATLAS
on 2HDM Type I
s = 14
Ldt = 300 fb-1: All unc.
Ldt = 300 fb-1: No theory unc.
Ldt = 3000 fb-1: All unc.
Ldt = 3000 fb-1: No theory unc.
Simulation Preliminary
TeV
tan
tan
Two Higgs Doublet Models (2HDM)
4
3.5
3
2.5
2.5
2
2
1.5
1.5
1
1
0.5
0.5
-0.2 -0.15
-0.1 -0.05
0
0.05
0.1
0.15
0.2
Expected 95% CL Limit
ATLAS
on 2HDM Type II
s = 14
Ldt = 300 fb-1: All unc.
Ldt = 300 fb-1: No theory unc.
Ldt = 3000 fb-1: All unc.
Ldt = 3000 fb-1: No theory unc.
-0.08 -0.06 -0.04 -0.02
cos( - )
Hideki Okawa
Moriond QCD & High Energy Interactions
0
Simulation Preliminary
TeV
0.02 0.04 0.06 0.08
cos( - )
12
Direct Searches for H/A
1
Heavy Higgs decays depend highly on
the parameter region. Various search
channels are needed.
Object and event selection
H→ZZ→4l & A→Zh→llbb are
sensitive for low tanβ cases & provides
complementary sensitivities to coupling
studies.
ATL-PHYS-PUB-2013-016
Events / 10 GeV
50000
-1
Ldt = 3000 fb
s = 14 TeV
45000
40000
35000
30000
25000
20000
15000
10000
5000
0
200
300
Hideki Okawa
A
Zh, mA = 360 GeV
tt
Zbb+Jets
Z+Jets
ZZ
0.1
5
0.1
BR(H± )
•
BR(A)
4.1
tanβ=2.5
A → tt̄
A → bb̄
A → hZ
A → ττ
BR(H)
•
A. Djouadi & J. Quevillon, arXiv:1304.1787
1
Mh = 126 GeV
H → tt̄
H → hh
H → bb̄
H → WW
H → ττ
H → ZZ
tanβ = 2.5
0.01
0.01
140
CMS PAS FTR-13-024
200
300
400 500
210
MA [GeV]
300
400
500
MH [GeV]
Figure 4: The decay branching ratios of the heavier MSSM Higgs boson
H ± (right) as a function of their masses for tan β = 2.5. The program
with modifications so that the radiative corrections lead to Mh = 126 G
H→ZZ→4l
gauge bosons in the case of the H state) not too suppressed, ma
appear. The branching fractions for the H/A/H ± decays are show
of their masses at tan β = 2.5. They have been obtained usin
A→Zh→llbb search
[65] assuming large MS values that lead to a fixed Mh = 126 G
A→Zh→llbb
does not significantly depend on other SUSY parameters, provided
supersymmetric particles are kinematically closed as it will be im
ATLAS Preliminary, Simulation
following8 , where the main features of the decays are summarised
400
500
600
700
– Sufficiently above the tt̄ threshold for the neutral and the tb t
mA [GeV]
Higgs bosons, the decay channels H/A → tt̄ and H + → tb̄ beco
13
Moriond QCD & High Energytan
Interactions
β<
∼ 3 and do not leave space for any other decay mode. Note
Summary
•
•
•
We discovered a Higgs boson with the Run 1 LHC data.
Future LHC data with 300 fb-1 and HL-LHC data with 3000 fb-1
allow us to:
•
Pursue precise measurements of the Higgs couplings; deviation
from the SM Higgs boson predictions would indicate new physics
•
•
•
Search for rare events (BSM decays, CP-violation)
Search for additional Higgs bosons in the high mass region.
Measure Higgs pair-production & self-coupling
With these precision measurements, we may be able to
discover underlying physics beyond the Standard Model.
Hideki Okawa
Moriond QCD & High Energy Interactions
14
backups
LHC
Luminosity
f ·N
L=
4· ·
2
f: Bunch crossing frequency, N: number of protons in a bunch,
ϵ: emittance, β*: amplitude function
CERN Courier, Aug. 2013
F.Bordry, LHCC Open Meeting, Dec. 2013
and β* ≤ 0.5 m
Hideki Okawa
Moriond QCD & High Energy Interactions
16
Detector Upgrades
To cope with the radiation damage of detector components,
limitation of bandwidth, improve granularity & coverage
Phase-0 upgrade (2013-2014)
•
•
ATLAS: Insertable B-layer (IBL), Level-1 topological trigger, Fast Track Trigger (FTK)
CMS: 4th muon end-cap station, new detector consolidation
Phase-1 upgrade (2018-2019)
•
ATLAS: High granularity Level-1 calorimeter trigger, New small wheel for Level-1
muon trigger
•
CMS: New Level-1 trigger system, new pixel detector, new photo-detector &
electronics for HCAL
Phase-2 upgrade (2023-2025)
•
•
ATLAS: New silicon tracker & forward calorimeter & electronics, level-1 track trigger
CMS: New tracker with Level-1 capability, DAQ/HLT upgrade, replace end-cap &
forward calo; possibly extension of muon coverage & EM preshower system
Hideki Okawa
Moriond QCD & High Energy Interactions
17
Upgrade & Performance
CMS NOTE-13-002
11
Phase 2 Upgrades to the CMS Experiment
Improvement of CMS trigger efficiency for Higgs channels with Phase-1 upgrade
(2018-2019).
•
34
CMS Simulation s = 14 TeV, L = 2.2 × 10
cm-2s-1, 25 ns
WH → eνbb
WH → µνbb
Upgrade
H → τhτh
Current
H → eτh
H → µτ
h
H → WW → eeνν
H → WW → µµνν
H → WW → eµνν
H → WW → µeνν
0
20
40
60
80
100
Efficiency (%)
Hideki Okawa
18
Moriond QCD & High Energy Interactions
34
-2 -1
Signal Strengths
ATL-PHYS-PUB-2013-014
Hideki Okawa
Moriond QCD & High Energy Interactions
19
4.5
17
Spin-parity
Coupling Scale Factors
CMS
Table
p 3: Precision on the measurements of kg , kW , k Z , k g , kb , kt and k1t . These values are obtained
at s = 14 TeV using an integrated dataset of 300 and 3000 fb . Numbers in brackets are
% uncertainties on couplings for [Scenario 2, Scenario 1] as described in the text. For the fit
including the possibility of Higgs boson decays to BSM particles d
the 95% CL on the branchingCMS NOTE-13-002
ATL-PHYS-PUB-2013-014,
fraction is given.
L (fb 1 )
kg
kW
kZ
kg
kb
kt
kt
kZg
kµµ
BRSM
300
[5, 7] [4, 6] [4, 6] [6, 8] [10, 13] [14, 15] [6, 8] [41, 41] [23, 23] [14, 18]
3000
[2, 5] [2, 5] [2, 4] [3, 5]
[4, 7]
[7, 10] [2, 5] [10, 12]
[8, 8]
[7, 11]
CMS Projection
ATLAS
Hideki Okawa
CMS Projection
300 fb 1
3000 fb 1
3000 fb at s = 14 TeV Scenario 1
300 fb at s = 14 TeV Scenario 1
Expected uncertainties on
Expected uncertainties
on unc.:
Theory unc.:
Theory
3000 fb at s = 14 TeV Scenario 2
300
fb
at
s
=
14
TeV
Scenario
2
Higgs boson couplings ratios
boson couplings ratios
All
Half Higgs
None
All
Half None
1

3.2% 2.7% 2.5% 2.5% 1.9% 1.6%
κ g• κ Z/κ H
κ g• κ /κ H
2
V =  Z =  W
3.3% 2.8% Z 2.7% 2.6% 1.9% 1.7%
κγ / κZ
κ /κ
 F = t = b = ⌧ = µ 8.6% 7.5%γ Z7.1% 4.1% 3.5% 3.2%
κW / κZ
Z
Z
8.4% 7.3%κ W / κ6.8%
6.3% 5.0% 4.6%
κb / κZ
κb / κZ
W
8.0% 6.7% 6.2% 6.1% 4.8% 4.3%
κτ / κZ
3
t
11% 9.0%κ τ / κ Z8.3% 7.0% 5.6% 5.1%
κZ / κg
 d3 = ⌧ = b
18% 14%κ Z / κ g13% 14% 11% 10%
µ
22% 20%κ t / κ g 20% 10% 8.1% 7.5%
κt / κg
Z
8.0% 7.0% 6.6% 5.2% 4.3% 4.0%
0.00
0.05
0.10 W
0.15 7.7% 6.8% 6.5%
0.00
0.15
4.9% 0.05
4.2% 3.9%0.10
expected uncertainty
expected uncertainty
t
19% 18% 18% 7.7% 6.7% 6.3%
4
 d = ⌧ = µ = b
16% 13% 12% 11% 8.2% 7.2%
Figure 14: Estimated precision on
the
measurements
ratios
of Higgs
boson couplings (plot
g
8.9% 7.9% of
7.5%
4.3%
3.8% 3.6%
shows ratio of partial width. It will be replaced
by a7.8%
plot 9.3%
of ratio
couplings
by the time
13% 9.3%
5.9%of 4.2%
p
Z are 1/2).
79%The
78%
78% 30%assume
30% 29%
of the pre-approval. Uncertainties
projections
s = 14 TeV and an
Z
6.7% 6.2% 4.9% 4.4%
integrated dataset of 300 fb 1 (left)
and 30008.1%
fb 1 7.1%
(right).
The projections are obtained with the
W
7.9% 6.9% 6.5% 5.9% 4.8% 4.4%
two uncertainty scenarios described
t in the text.
22% 20% 20% 10% 8.4% 7.8%
5
 d3 = ⌧ = b
18% 15% 13% 15% 11% 9.7%
(
i
)
,µn
(
i
)
,µn
˜
µ
23% 21%
21%of a11%
8.5% with
7.6%polarization vector
where f
(f
) is the (conjugate)
field strength
tensor
Z boson
11% Higgs
9.1% field.
8.5% 6.9%
5.5% 4.9%models 0+ and 0
ei and v the vacuum expectationg value of the
The spin-zero

13% 9.3% 7.8% 9.4% 6.1% 4.6%
correspond to the terms with a1 and
a
,
respectively.
3
Z
79% 78% 78% 30% 30% 29%
Nr.
Coupling
-1
-1
-1
-1
p the overall rate
Four independent
numbers
the process
in with
Eq. 300
(2),and
provided
Table 18: real
Expected
precision describe
on Higgs coupling
scale factors
3000 fb 1 atthat
s = 14 TeV
Moriond
QCD
&
High
Energy
Interactions
is treated separately
and
one
overall
complex
phase
is
not
measurable.
For
vector-boson
for selected parametrizations, assuming no new contributions to the Higgs total width beyond athose
in
the Standard Model. The Higgs total width can still di↵er from its expected value in the Standard Model
20
ding the possibility of Higgs boson decays to BSM particles d the 95% CL on the branching
on is given.
b 1)
kg
kW
kZ
kg
kb
kt
kt
kZg
kµµ
BRSM
00
[5, 7] [4, 6] [4, 6] [6, 8] [10, 13] [14, 15] [6, 8] [41, 41] [23, 23] [14, 18]
00
[2, 5] [2, 5] [2, 4] [3, 5]
[4, 7]
[7, 10] [2, 5] [10, 12]
[8, 8]
[7, 11]
Higgs Coupling Ratio Fit
ATLAS Simulation Preliminary
MS Projection
s = 14 TeV: Ldt=300 fb-1 ; Ldt=3000 fb-1
Expected uncertainties
gZ on
Higgs boson couplings ratios
κ g• κ Z/κ H
ATL-PHYS-PUB-2013-014, CMS NOTE-13-002
-1
s = 14 TeV Scenario 1
-1
s = 14 TeV Scenario 2
300 fb at
300 fb at
Expected uncertainties on
Higgs boson couplings ratios
WZ
κ g• κ Z/κ H
κγ / κZ
κW / κZ
tg
κW / κZ
κb / κZ
Z
κτ / κZ
κZ / κg
µZ
0.00
0.05
gZ
s = 14 TeV Scenario 1
3000 fb-1 at
s = 14 TeV Scenario 2
Scenario 2:
theory unc. 50%,
other sys. 1/√lumi
κτ / κZ
κZ / κg
3000 fb-1 at
Scenario 1:
same systematics
as Run 1
κγ / κZ
κb / κZ
κt / κg
CMS Projection
κt / κg
0.10
0.15
0.00
expected uncertainty
Z
0.05
0.10
0.15
expected uncertainty
e 14: Estimated precision on the measurements ofCoupling
ratios offitHiggs
couplings
(plot
withoutboson
assuming
the
0.78
s ratio of partial
width. It will be replaced
by atotal
plotwidth
of ratio
of Higgs
couplings
of the
(Z )Z
p boson,bysothe time
more model-independent.
e pre-approval. Uncertainties are 1/2). The projections
assume s = 14 TeV and an
0.2 3000 fb
0.3 1 (right). The projections are obtained with the
1 (left) and
rated dataset of0300 fb 0.1
X
uncertainty scenarios described inXYthe
= text.
•
Y
Hideki Okawa
(i ),µn ˜(i ),µn
Moriond QCD & High Energy Interactions
21
Yukawa Coupling
Yi
ATL-PHYS-PUB-2013-014
Yukawa Coupling
ATLAS Simulation Preliminary
1
mf
Yf = f
v
mV
YV = V
v
t
Z
-1
Ldt=300 fb
Ldt=3000 fb-1
10-1
g
W
10-2
-3
Y: Yukawa coupling, f: fermion, V: weak boson,
m: mass
10
s = 14 TeV
µ
10-1
1
10
102
mX [GeV]
Hideki Okawa
Moriond QCD & High Energy Interactions
22
Table 4: Estimated precision on the measurements of ratios of Higgs boson couplings (plot
shows ratio of partial width. It will be replaced by a plot of ratio of couplings
by the time of
p
the pre-approval. Uncertainties are 1/2). These values are obtained at s = 14 TeV using
an integrated dataset of 300 and 3000 fb 1 . Numbers in brackets are % uncertainties on the
measurements estimated under [scenario2, scenario1], as described in the text.
L (fb 1 ) k g · kZ / k H kg /kZ kW /kZ kb /kZ kt /kZ kZ /k g kt /k g
kµ /kZ kZg /kZ
300
[4,6]
[5,8]
[4,7]
[8,11]
[6,9]
[6,9] [13,14] [22,23] [40,42]
3000
[2,5]
[2,5]
[2,3]
[3,5]
[2,4]
[3,5]
[6,8]
[7,8]
[12,12]
Coupling Scale Ratios
CMS
Coupling
300 fb 1
3000 fb 1
Projections of the expected 2 lnratio
L values
from
assuming
300 fb 1 and 3000 fb 1 are
Theory
unc.:the fits Theory
unc.:
Half contribution
None All
Half
ATL-PHYS-PUB-2013-014,
shown in Fig. 15. A 68% (95%) CL limitAllon the
of fNone
at the level
a3 can be achieved
1

7.6%
7.1%
6.9%
4.1%
3.3%
3.0%
VV
1
CMS
NOTE-13-002
of 0.07 (0.13) with 300 fb 1 and 0.02
(0.04
) with
is limited by
statistical
8.5%
7.7% 3000
7.5% fb3.7%. The
3.2% analysis
3.0%
FV
ZZ
10% all9.3%
8.9% of
6.1%
4.7% 4.1%uncertainties are preserved
uncertainties up to a high luminosity,
but
sources
systematic
2
4.7% 4.0% 3.7% 2.8% 2.0% 1.6%
WZ
in the projections.
9.4% 8.6% 8.4% 4.5% 3.9% 3.6%
FZ
uu
13% 11% 10% 6.3% 5.0% 4.5%
3
10% 8.9% 8.5% 4.6% 3.8% 3.5%
Vu
11% 9.1% 8.2% 7.1% 5.6% 4.9%
du
⌧⌧
22% 18% 16% 17% 14% 12%
4
12% 11% 9.8% 9.3% 7.2% 6.4%
V⌧
12% 9.6% 8.7% 9.1% 7.0% 6.1%
q⌧
24% 22% 21% 12% 9.6% 8.8%
µ⌧
gZ
6.4% 4.4% 3.5% 4.6% 2.9% 2.0%
5.1% 4.6% 4.4% 3.0% 2.3% 2.1%
WZ
18% 18% 17% 7.0% 6.1% 5.8%
tg
5
13% 11% 11% 10% 7.6% 6.6%
⌧Z
22% 21% 20% 9.2% 7.2% 6.3%
µZ
12% 11% 11% 5.9% 5.0% 4.7%
gZ
11% 6.9% 5.1% 7.1% 3.9% 1.8%
Z
78% 78% 78% 30% 29% 29%
(Z )Z
6

22% 16% 13% 14% 8.3% 5.4%
11% 6.9% 5.1% 7.1% 3.9% 1.8%
Z
11% 7.3% 5.6% 7.4% 4.2% 2.2%
W
27% 23% 21% 14% 9.7% 7.7%
t
15% 12% 11% 10% 7.7% 6.7%
⌧
21% 20% 20% 7.2% 6.6% 6.3%
µ
18% 13% 11% 11% 6.8% 5.0%
g
77% 76% 76% 29% 29% 29%
(Z )
Nr.
ATLAS
Figure 15: Distribution
of expected
2 lnof L
f a3Energy
for
theInteractions
projection
to 300 fb p1 (green, dotted)
Hideki Okawa
QCD
& for
High
Table 19: Expected Moriond
precision on ratios
Higgs
coupling
scale factors
with 300 and 3000 fb 1 at s =
and 3000 fb 1 (magenta,
dot-dashed).
14 TeV for selected
benchmark parametrizations without assumptions on the Higgs total width. In model
23
CP-mixing
(
)
(H→ZZ * →4l)
ATL-PHYS-PUB-2013-013, CMS NOTE-13-002
Hideki Okawa
Moriond QCD & High Energy Interactions
24
eliminary
ΓH
ΓH
ΓH
ΓH
nent
•
Higgs Width Limit
< 30 GeV
= 1 × Γ H ,SM
= 10 × Γ H ,SM
= 100 × Γ H ,SM
= 1000 × Γ H ,SM
p
ATLAS Simulation
Internal Preliminary
3
ΓH
ΓH
ΓH
ΓH
Interference real component
after detector smearing
2
Tγ γ
< 30 GeV
= 1 × Γ H ,SM
= 10 × Γ H ,SM
= 100 × Γ H ,SM
= 1000 × Γ H ,SM
ATL-PHYS-PUB-2013-014
1
SM total width of 4.2 MeV
of the 126 GeV Higgs is not measurable at the LHC due to
0
its experimental mass resolution.
-1
•
Finite width effects causes the Higgs invariant mass peak to shift due to the
-2
interference between H→γγ & diphoton continuum.
125
130
135
140
-3
110
145
150
m γ γ [GeV]
dσ / dm γ γ [fb/GeV]
d / dm [fb/GeV]
• CMS limit from Run 1: Γ
eal interference
• ATLAS expected limit: Γ
115
120
2
1 1
140
m γ γ [GeV]
tot
< 920 MeV (200 MeV) at 95% CL with 300 fb-1 (3000 fb-1).
(b) Real term after detector smearing
30GeV
GeV
<<30
p ppT<Tγ 30
GeV
γ
Tγ γ
Γ HΓ=HH1==×11Γ×HΓ,SM
,SM
HH,SM
Γ
=
10
×
Γ
= 10
Γ H =HH10
× Γ H ,SM
,SM
HH,SM
Γ
=
100
×
Γ
= 100
Γ H =HH100
× Γ H ,SM
,SM
HH,SM
Γ
=
1000
×
Γ
= 1000
Γ H =HH1000
× Γ H ,SM
,SM
HH,SM
2
2 2.5
135
< 6.9 GeV at 95% CL.
ATLAS
Internal
Simulation
Preliminary
ATLAS
Internal
Simulation
Preliminary
ATLAS
Internal
Apparentreal
mass
shift
Interference
component
after detector smearing
130
tot
4 44
3.5
3 3
3
125
Δ mH [MeV]
120
Tγ γ
4
dσ / dm γ γ [fb/GeV]
p
1000
ATLAS
Simulation Preliminary
∫ L dt = 3000 fb
-1
, s = 14 TeV
Expected mass shift in the SM
Expected mass shift due to interference
Statistical ⊕ Systematic one-sided 95% CL Neyman belt
Statistical one-sided 95% CL Neyman belt
500
0
1.5
0 01
-500
0.5
-1 -1
-1000
0
-2 -2
-0.5
-1
-3 -3
110
110110
Hideki Okawa
115
115115
120
120120
125
125125
130
130130
135
140
135135
140140
[GeV]
mγ m
[GeV]
γ
-1500
0
50
100 150 200 250 300 350 400 450 500
Γ H / Γ SM
H
Moriond QCD & High Energy Interactions
(c) Apparent mass shift
25
Higgs-Portal Interpretation
100
Higgs decaying to DM
DM-nucleon scattering in Higgs-portal DM Model
χ
χ
χ
Our analysis
λhχχ
λhχχ
h
h
fN
χ
N
Direct DM
detection
experiments
(XENON,
DAMA, etc.)
N
(a)
(b)
•
The limits on BR(H→inv) could be mapped to bounds on the coupling of
•
The Higgs-portal is a particular type of DM models, where DM interacts
through the couplings to Higgs.
Figure 65: Feynman diagrams for the decay of the Higgs boson into dark matter particles (a) and scatmatter off
(DM)
& DM-nucleon
cross ofsection
Higgs-portal
DM
tering Higgs-dark
of dark matter particles
of a nucleon
with the exchange
a Higgs for
boson
(b). The Higgs-dark
mattermodels
interaction vertex has a coupling constant of λhχ χ . In the scattering diagram the Higgs-nucleon
coupling strength is parameterized with a form factor, fN .
σχScalar
N
=
λh2χScalar
χ
m4N fN2
!
"
(25)
have reported an observation of a dark matter signal, including CRESST [62], DAMA [63], and
χ
NT [64]. The most recent observation from the CDMS collaboration [65] provides compellingχ
nce an 8.6 GeV dark matter particle. Not all of the observations are consistent with each other and
λhχχ
results are disputed by the community. Direct detection experiments make no a priori assumption
the mechanism by which dark matter particles interact with Standard Model particles, but it is
le that the interaction is through the exchange of a Higgs boson. If dark matter couples toλhχχ
the Stanh
h the Higgs mass then
Model through the Higgs boson and the mass of the particle is less than half
s to the dark matter particle will enhance the invisible branching fraction. Under the assumption
fN
ark matter couples to the Standard Model only through the Higgs boson we aim to place limits
Higgs
invisible
Higgs-DM
coupling
DM-nucleon
xsec
imentary to the direct
detection
results ondecay
the mass and interaction
cross section
of the dark matter
χ
N
e.
(a)
(b)
ggs Portal models [66, 67, 68] make a simple, ad-hoc extension to the Standard Model by introg a new particle that couples to only the Higgs boson. The interaction strength is introduced with
Figure 65: Feynman diagrams for the decay of the Higgs boson into dark matter
pling constant, λhχ χ . Within this model
and decay process can be compared by ex(h the scattering
)
BR(h
)=
tering
of dark matter particles off of a nucleon with the exchange of a Higgs boso
(h
) + (h
SM
) 65 shows feynman diagrams for both the
ng the limits in terms of this coupling
constant.
Figure
matter
interaction
vertex
has arules
coupling
constant of λhχ χ . In the scattering diagra
and scattering processes where λhχ χ appears in both
diagrams.
Using the
feynman
for these
coupling
strength in
is terms
parameterized
with
a form factor, fN .
ms the Higgs partial width and scattering cross section
are determined
of λhχ χ . The
Higgs
width for the decay to
darkconsider
matter particles
for the
scalar,
vector, scalar,
and fermion
cases is given
in
We
three
DM
types:
vector,
majorana
fermion
ions 22, 23, and 24 respectively.
Mapping & DM-types
(h
Γ
Scalar
)
(h → χ χ ) =
λh2χScalar
v2
χ
64π mh
2
h
!
"
2mχ
1−
mh
#2 $1/2
!
"
#2 $1/2
2 Vector v2 %
&
λ
2mχ
hχ χ
4
2 2
4
1
−
m
−
4m
ΓVector (h → χ χ ) =
m
+
12m
χ h
χ
256π m4χ mh h
mh
ΓMajorana (h → χ χ ) =
2m
λh2χMajorana
v
h
χ
32π Λ2
!
"
2mχ
1−
mh
#2 $3/2
N
(22) =
σχScalar
N
σχVector
N(23) =
λh2χScalar
χ
m4N fN2
!
"
16π m4h mχ + mN 2
λh2χVector
χ
m4N fN2
"
!
16π m4h mχ + mN 2
2 Majorana
λ
m2χ m4N fN2
hχ χ
Majorana
σχ N (24) =
!
"
4π Λ2 m4h mχ + mN 2
he partial width is a function of only the Higgs
bosonThe
mass,
the section
dark matter
the vacuum
1474
cross
has mass,
an additional
dependence on the nucleon mass, mN an
tation value, and the coupling constant. Note the introduction of a cutoff scale, Λ in the fermionic
1475
which quantifies the coupling strength between the Higgs boson and the Nucleon.
In this case the Higgs interaction operator has dimension five and is non-renormalizable. A cutoff
1476
termined using lattice calculations and suffers from large theoretical uncertainties [
s added that assumes the presence of new physics at a higher energy scale which would produce a
Table 2: Couplings of the light Higgs boson h to weak vector bosons (κV ), up-type quarks (κu ), down-type
quarks (κd ), and leptons (κl ), expressed as ratios to the corresponding SM expectations.
2HDM & Heavy Higgs
Both Higgs doublets acquire vacuum expectation values, v1 and v2 respectively, with their ratio being
denoted by tan β ≡ v2 /v1 . Unitarity requires that v21 + v22 = v2 = (246 GeV)2 . The Higgs sector of the
2HDM model can be described by six parameters: four Higgs boson masses (mh , mH , mA , and mH ± ),
tan β, and the mixing angle α of the two neutral, CP-even Higgs states. A discrete Z2ATL-PHYS-PUB-2013-015
symmetry [26] is
assumed such that the parameter m12 in the Higgs potential is zero. Gauge invariance fixes the couplings
strength
Typebosons
I
II relative to their
TypeSM
IIIvalues to be Type IV
ofCoupling
the two neutral,
CP-even Higgs
to vectorType
bosons
κV
κu
κd
κl
sin(β − α)
sin(β − α)
sin(β − α)
2HDM
SM
ghVV /ghVV
= sin(β)
sin(β − α) cos(α)/ sin(β)
cos(α)/ sin(β)
cos(α)/
SM
g2HDM
= cos(β)
cos(β − α) cos(α)/ sin(β)
cos(α)/ sin(β)
sin(α)/
HVV /g−
HVV
cos(α)/ sin(β) − sin(α)/ cos(β) − sin(α)/ cos(β)
Here V = W, Z and gSM
hVV,HVV denote the SM Higgs couplings to vector bosons.
The Glashow-Weinberg condition is satisfied by four types of 2HDMs:
sin(β − α)
cos(α)/ sin(β)
(5)
− sin(α)/ cos(β)
cos(α)/ sin(β)
Table 2: Couplings of the light Higgs boson h to weak vector bosons (κV ), up-type quarks (κu ), down
• Type
doublet
to vector
bosons,
the other couples
to expectations.
fermions. The first
quarks
(κdI:),One
andHiggs
leptons
(κl ), couples
expressed
as ratios
to while
the corresponding
SM
doublet is “fermiophobic” in the limit of zero mixing.
•Both
TypeHiggs
II: Thisdoublets
is an “MSSM-like”
model, expectation
in which onevalues,
Higgs doublet
to up-typewith
quarks
acquire vacuum
v1 and couples
v2 respectively,
their ratio
and the other to down-type quarks and leptons.
2
2
2
2
denoted by tan β ≡ v2 /v1 . Unitarity requires that v1 + v2 = v = (246 GeV) . The Higgs sector o
• Type
III: This
a “lepton-specific”
model,
where thefour
HiggsHiggs
bosonsboson
have the
same (m
couplings
2HDM
model
canisbe
described by six
parameters:
masses
mA , and m
h , mH , to
as in
the Type
I model
leptons
as in Type
II. Higgs states. A discrete Z2 symmetry [
tan β,quarks
and the
mixing
angle
α ofand
thetotwo
neutral,
CP-even
assumed
thatisthe
parameter
m12where
in thethe
Higgs
is zero.
Gauge
invariance
fixes
• Typesuch
IV: This
a “flipped”
model,
Higgspotential
bosons have
the same
couplings
to quarks
as the coup
of theintwo
neutral,
CP-even
Higgs
bosons
to vector
bosons
the Type
II model,
but with
lepton
couplings
as in Type
I. relative to their SM values to be
2HDM
SM and=
The couplings of the neutral Higgs bosonsgto
fermions
vector
bosons
/g
sin(β
− α)in each of the four types of
hVV
hVV
2HDMs,
to the QCD
Higgs& couplings
inInteractions
the SM, are summarized in Table 2 [32].
Hideki
Okawaexpressed as ratios relative
Moriond
High
Energy
2HDM
SM
g W and
/g Z bosons,
= κcos(β
− α) quarks, κ for down-type
The coupling strengths are denoted κ for the
for up-type
28
low tanβ Heavy Higgs
GeV, and low tan β, tan β <
∼ 5. As in the case of A, the cross section for pp → tt̄H is
suppressed compared to the SM case while the rate for pp → bb̄H is not enough enhanced.
However, in this case, the vector boson fusion pp → Hqq and Higgs-strahlung processes
q q̄ → HW/HZ are also at work and have production rates that are not too suppressed
A. Djouadi & J. Quevillon, arXiv:1304.1787
<
compared to the SM at sufficiently low MH values, MH ∼ 200–300 GeV and tan β ≈ 1.
√
s = 8 TeV
tanβ = 2.5
Mh = 126 GeV
σ(pp → Φ) [pb]
10
ggA
ggH
bbA
bbH
Hqq
WH
ZH
1
0.1
1
0.1
0.01
0.001
0.001
200
400
MA [GeV]
600
800 1000
ggA
ggH
bbA
bbH
Hqq
WH
ZH
10
0.01
140
√
s = 14 TeV
tanβ = 2.5
Mh = 126 GeV
100
σ(pp → Φ) [pb]
100
140
200
400
600
800 1000
MA [GeV]
Figure 3: The production cross sections of the MSSM heavier Higgs bosons at the LHC with
√
√
s = 8 TeV (left) and s = 14 TeV (right) for tan β = 2.5. Only the main channels are presented.
Hideki
High Energy
Interactions
TheOkawa
higher order corrections are Moriond
includedQCD
(see&text)
and the
MSTW PDFs have been adopted.
29
24
LHC & Other Colliders
Snowmass, Higgs Working Group Report, 2013
Table 1-20. Expected precisions on the Higgs couplings and total width from a constrained 7-parameter fit assuming no non-SM
production or decay modes. The fit assumes generation universality (u ⌘ t = c , d ⌘ b = s , and ` ⌘ ⌧ = µ ). The ranges
shown for LHC and HL-LHC represent the conservative and optimistic scenarios for systematic and theory uncertainties. ILC numbers
assume (e , e+ ) polarizations of ( 0.8, 0.3) at 250 and 500 GeV and ( 0.8, 0.2) at 1000 GeV, plus a 0.5% theory uncertainty. CLIC numbers
assume polarizations of ( 0.8, 0) for energies above 1 TeV. TLEP numbers assume unpolarized beams.
Facility
p
s (GeV)
R
Ldt (fb 1 )
LHC
14,000
HL-LHC
14,000
ILC500
250/500
ILC500-up
250/500
ILC1000
250/500/1000
ILC1000-up
250/500/1000
CLIC
350/1400/3000
TLEP (4 IPs)
240/350
300/expt
3000/expt
250+500
1150+1600
250+500+1000
1150+1600+2500
500+1500+2000
10,000+2600
5
7%
2
5%
8.3%
4.4%
3.8%
2.3%
g
6
8%
3
5%
2.0%
1.1%
1.1%
0.67%
3.6/0.79/0.56%
0.79%
W
4
6%
2
5%
0.39%
0.21%
0.21%
0.2%
1.5/0.15/0.11%
0.10%
Z
4
6%
2
4%
0.49%
0.24%
0.50%
0.3%
0.49/0.33/0.24%
0.05%
`
6
8%
2
5%
1.9%
0.98%
1.3%
0.72%
3.5/1.4/<1.3%
0.51%
d = b
10
13%
4
7%
0.93%
0.60%
0.51%
0.4%
1.7/0.32/0.19%
0.39%
u = t
14
15%
7
10%
2.5%
1.3%
1.3%
0.9%
3.1/1.0/0.7%
0.69%
Hideki Okawa
Moriond QCD & High Energy Interactions
/5.5/<5.5%
1.45%
30
Higgs working group rep
