Download - The ILC Higgs Factory
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Philip Burrows
John Adams Institute, Oxford University
The ILC Higgs Factory
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Outline
• Introduction
• The Large Hadron Collider + the Higgs boson
• The Higgs factory
• The International Linear Collider (ILC)
• Higgs physics at ILC
• Project implementation and timeline
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Large Hadron Collider (LHC)
Largest,
highest-energy
particle
collider
CERN,
Geneva
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A Higgs boson?
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A Higgs boson?
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The 2012 discovery
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The 2012 discovery
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ATLAS status
8 Monica D’Onofrio, LHCC June 4 2014
ATLAS CONF 2014 009
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It’s officially a Higgs Boson!
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Finger-printing the Higgs boson
Determine its ‘profile’:
• Mass
• Width
• Spin
• CP nature
• Coupling to fermions
• Coupling to gauge bosons
• Yukawa coupling to top quark
• Self coupling Higgs potential
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Finger-printing the Higgs boson
Is it:
the Higgs Boson of the Standard Model?
another type of Higgs boson?
something that looks like a Higgs boson but
is actually more complicated?
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Finger-printing the Higgs boson
Is it:
the Higgs Boson of the Standard Model?
another type of Higgs boson?
something that looks like a Higgs boson but
is actually more complicated?
Measurements of the Higgs couplings to the
different species of quarks, leptons and gauge
bosons are the key to answering these questions
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Non-Standard Higgs couplings
Snowmass Higgs working group:
Decoupling limit:
If all new particles (except Higgs) are at a (high)
high mass scale M
deviations from SM predictions
are of order mH2 / M2
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For M = 1 TeV, deviations of couplings from SM:
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Non-Standard Higgs couplings
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For M = 1 TeV, deviations of couplings from SM:
Deviations in the range 1% 10%
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Non-Standard Higgs couplings
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For M = 1 TeV, deviations of couplings from SM:
Deviations in the range 1% 10%
measurements must be significantly more
precise to resolve such deviations
Non-Standard Higgs couplings
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LHC projections
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LHC projections
Currently, typically LHC projected precisions on
Higgs coupling measurements assume that:
• Standard Model is correct
• No non-Standard decay modes (total width = SM)
• Charm and top couplings deviate from SM by
same factor
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ATLAS projections
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ATL PHYS PUB 2013 014
Luca Fiorini, LHCC Dec 2013
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CMS projections
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CMS-NOTE-2013-002
Yurii Maravin, LHCC Dec 2013
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LHC projections
Currently, typically LHC projected precisions on
Higgs coupling measurements assume that:
• Standard Model is correct
• No non-Standard decay modes (total width = SM)
• Charm and top couplings deviate from SM by
same factor
Such assumptions are not necessary for Higgs
coupling measurements at e+e- Higgs Factory …
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‘Higgs factory’
• e+e- collider:
linear collider
storage ring
• photon-photon collider:
usually considered as add-on to linear collider
• muon collider:
usually considered as a next step beyond a
future neutrino factory
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e+e- Higgs factory
e+e- annihilations:
E > 91 + 125 = 216 GeV
E ~ 250 GeV
E > 91 + 250 = 341 GeV
E ~ 500 GeV
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e+e- colliders
• Produce annihilations of point-like particles under
controlled conditions:
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e+e- colliders
• Produce annihilations of point-like particles under
controlled conditions:
well defined centre of mass energy: 2E
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e+e- colliders
• Produce annihilations of point-like particles under
controlled conditions:
well defined centre of mass energy: 2E
complete control of event kinematics:
p = 0, M = 2E
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e+e- colliders
• Produce annihilations of point-like particles under
controlled conditions:
well defined centre of mass energy: 2E
complete control of event kinematics:
p = 0, M = 2E
polarised beam(s)
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e+e- annihilations
L or R
g /
L or R
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e+e- colliders
• Produce annihilations of point-like particles under
controlled conditions:
well defined centre of mass energy: 2E
complete control of event kinematics:
p = 0, M = 2E
polarised beam(s)
clean experimental environment
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g /
e+e- annihilations
E
E
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g /
e+e- annihilations
2E > 160 GeV
E
E
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g /
e+e- annihilations
2E > 182 GeV
E
E
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e+e- annihilations
2E > 216 GeV
E
E
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g /
e+e- annihilations
2E > 350 GeV
E
E
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g /
e+e- annihilations
???
E
E
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e+e- colliders
Wyatt
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e+e- colliders
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e+e- colliders
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e+e- colliders
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e+e- colliders
L ~ 1034 (250 GeV) 20,000 H / year
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e+e- colliders
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e+e- colliders
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European particle physics strategy 2013
There is a strong scientific case for an electron-positron
collider, complementary to the LHC, that can study the
properties of the Higgs boson and other particles with
unprecedented precision and whose energy can be
upgraded.
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European particle physics strategy 2013
There is a strong scientific case for an electron-positron
collider, complementary to the LHC, that can study the
properties of the Higgs boson and other particles with
unprecedented precision and whose energy can be
upgraded.
The Technical Design Report of the International Linear
Collider (ILC) has been completed, with large European
participation. The initiative from the Japanese particle
physics community to host the ILC in Japan is most
welcome, and European groups are eager to participate.
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European particle physics strategy 2013
There is a strong scientific case for an electron-positron
collider, complementary to the LHC, that can study the
properties of the Higgs boson and other particles with
unprecedented precision and whose energy can be
upgraded.
The Technical Design Report of the International Linear
Collider (ILC) has been completed, with large European
participation. The initiative from the Japanese particle
physics community to host the ILC in Japan is most
welcome, and European groups are eager to participate.
Europe looks forward to a proposal from Japan to discuss a
possible participation.
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Snowmass executive summary 2013
Compelling science motivates continuing this program with
experiments at lepton colliders. Experiments at such
colliders can reach sub-percent precision in Higgs boson
properties in a unique, model-independent way, enabling
discovery of percent-level deviations from the Standard
Model predicted in many theories.
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Snowmass executive summary 2013
Compelling science motivates continuing this program with
experiments at lepton colliders. Experiments at such
colliders can reach sub-percent precision in Higgs boson
properties in a unique, model-independent way, enabling
discovery of percent-level deviations from the Standard
Model predicted in many theories. They can improve the
precision of our knowledge of the W, Z, and top quark well
enough to allow the discovery of predicted new-physics
effects. They search for new particles in a manner
complementing new particle searches at the LHC.
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Snowmass executive summary 2013
Compelling science motivates continuing this program with
experiments at lepton colliders. Experiments at such
colliders can reach sub-percent precision in Higgs boson
properties in a unique, model-independent way, enabling
discovery of percent-level deviations from the Standard
Model predicted in many theories. They can improve the
precision of our knowledge of the W, Z, and top quark well
enough to allow the discovery of predicted new-physics
effects. They search for new particles in a manner
complementing new particle searches at the LHC. A global
effort has completed the technical design of the International
Linear Collider (ILC) accelerator and detectors that will
provide these capabilities in the latter part of the next decade.
The Japanese particle physics community has declared this
facility as its first priority for new initiatives.
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e+e- Higgs Factory
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ILC Higgs Factory Roadmap
250 GeV:
Mass, Spin, CP nature
Absolute meas. of HZZ
BRs Higgs qq, ll, VV
350 GeV:
Top threshold: mass, width, anomalous couplings …
(more stats on Higgs BRs)
500 GeV:
HWW coupling total width absolute couplings
Higgs self coupling
Top Yukawa coupling
1000 GeV: as motivated by physics
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Higgs mass measurement
Recoil mass:
- independent of
Higgs decay
Discovery mode
for ‘H’ decay to
weakly-interacting
particles
(Fujii)
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Higgs spin determination
Rise of
cross-section
near threshold
(TESLA TDR)
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Higgs branching ratios determination (1)
(ILC TDR)
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Higgs branching ratios determination (2)
(Fujii / ILC TDR)
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Higgs branching ratios determination
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Higgs self-coupling determination
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Higgs top-coupling determination
(Price, Roloff)
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Baseline: 250 fb-1 @ 250 GeV 3 years
500 fb-1 @ 500 GeV 3 years
1000 fb-1 @ 1000 GeV 3 years
ILC roadmap
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Baseline: 250 fb-1 @ 250 GeV 3 years
500 fb-1 @ 500 GeV 3 years
1000 fb-1 @ 1000 GeV 3 years
Followed by luminosity upgrade:
‘HL-ILC’: +900 fb-1 @ 250 GeV +3 years
+1100 fb-1 @ 500 GeV +3 years
+1500 fb-1 @ 1000 GeV +3 years
ILC roadmap
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ILC baseline precisions
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Higgs coupling map
(Fujii)
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ILC baseline + HL-ILC precisions
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Model-independent couplings extraction
33 input measurements
11-parameter fit
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Model-independent couplings
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Model-independent couplings
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Comparison with LHC
LHC does not project making model-independent
Higgs coupling measurements
LHC projections assume the Standard Model and
estimate precision relative to SM couplings, also
assuming charm follows top
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Model-dependent couplings extraction
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Comparison with LHC
LHC does not project making model-independent
Higgs coupling measurements
LHC projections assume the Standard Model and
estimate precision relative to SM couplings, also
assuming charm follows top
For purpose of comparison, can follow same model-
dependent procedure for ILC …
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Model-dependent couplings extraction
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Model-dependent couplings extraction
~10 x LHC sensitivity
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For M = 1 TeV, deviations of couplings from SM:
Deviations in the range 1% 10%
measurements must be significantly more
precise to resolve such deviations
Non-Standard Higgs couplings
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Specific beyond-SM examples
2HDM/MSSM
Zivkovic et al
Simulated ILC measurements
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The accelerator
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Large Electron Positron collider (RIP)
0.1 TeV
beams
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Large Electron Positron collider (RIP)
0.1 TeV
beams
Synch
rad
18 MW
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Super Large Electron Positron collider?
0.2 TeV
beams?
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Super Large Electron Positron collider?
0.2 TeV
beams?
Synch
rad
300 MW
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Super Large Electron Positron collider?
0.2 TeV
beams?
Synch
rad
300 MW
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Linear Colliders for electrons + positrons
Stanford
Linear
Accelerator
Center
(California)
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main linacbunchcompressor
dampingring
source
pre-accelerator
collimation
final focus
IP
extraction& dump
KeV
few GeV
few GeVfew GeV
250-500 GeV
Designing a Linear Collider
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International Linear Collider (ILC)
31 km
c. 250 GeV / beam
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Beam parameters
ILC (500)
Electrons/bunch 0.75 10**10
Bunches/train 2820
Train repetition rate 5 Hz
Bunch separation 308 ns
Train length 868 us
Horizontal IP beam size 655 nm
Vertical IP beam size 6 nm
Longitudinal IP beam size 300 um
Luminosity 2 10**34
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ILC Detectors
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ILC project status
• 2005-12 ILC run by Global Design Effort (Barish)
• C. 500 accelerator scientists worldwide involved
• A Reference Design Report (RDR) was completed in 2007
including a first cost estimate
• 2008-12 engineering design phase
major focus on risk minimisation + cost reduction
• Technical Design document released end 2012
revised cost estimate + project implementation plan
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Technical Volumes
Reference Design
Report
ILC Technical
Progress Report
(“interim report”)
TDR Part I:
R&D
TDR Part II:
Baseline
Reference
Report
Technical Design
Report
~250 pages
Deliverable 2
~300 pages
Deliverables
1,3 and 4
AD&I
Global Design Effort 85
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86
ILC project status
• 2005-12 ILC run by Global Design Effort (Barish)
• C. 500 accelerator scientists worldwide involved
• A Reference Design Report (RDR) was completed in 2007
including a first cost estimate
• 2008-12 engineering design phase
major focus on risk minimisation + cost reduction
• Technical Design document released end 2012
revised cost estimate + project implementation plan
• Lyn Evans assumed project leadership 2013
Japan preparing implementation of ILC at Kitakami
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ILC Plan in Japan
► Japanese HEP community proposes to host ILC based on the “staging scenario” to the Japanese Government.
ILC starts as a 250GeV Higgs factory, and will evolve to a 500GeV machine.
Technical extendability to 1TeV is to be preserved.
Yamauchi
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ILC Plan in Japan
► Japanese HEP community proposes to host ILC based on the “staging scenario” to the Japanese Government.
ILC starts as a 250GeV Higgs factory, and will evolve to a 500GeV machine.
Technical extendability to 1TeV is to be preserved.
Yamauchi
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89
Developments in Japan
Yamamoto, HEPAP, 11/3/13
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ILC in Japan?
meeting of Lyn Evans and Prime Minister Abe, March 27, 2013
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91
Developments in Japan
Yamamoto, HEPAP, 11/3/13
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PPAP recommendation
‘It is essential that
the UK engages
with the Higgs
Factory initiative
and positions itself
to play a leading
role should the
facility go ahead.’
92
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93
Extra material follows
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94
Model-independent couplings
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95
Key challenges
• Energy:
sustain high gradients
> 30 MeV/m
• Luminosity:
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96
Niobium Accelerating Cavities
TM010 mode
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97
Niobium Accelerating Cavities
c. 20,000 needed
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98
Niobium Accelerating Cavities
c. 20,000 needed
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99
Niobium Accelerating Cavities
Courtesy: R. Geng
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100
European X-FEL at DESY
3.4km
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101
Key challenges
• Energy:
sustain high gradients
> 30 MeV/m
• Luminosity:
goal is
> 10**34 / cm**2/ s
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102
ILC Cost Estimate (February 2007)
shared value = 4.87 Billion ILC Value Units
site-dependent value = 1.78 Billion ILC Value Units
total value = 6.65 Billion ILC Value Units
(shared + site-dependent)
labour = 22 million person-hours = 13,000 person-
years
(assuming 1700 person-hours per person-year)
1 ILC Value Unit = 1 US Dollar (2007) = 0.83 Euros = 117 Yen
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103
0
500
1,000
1,500
2,000
2,500
3,000
3,500
4,000
4,500
Main
Linac
DR RTML e+
Source
BDS Common Exp Hall e-
Source
VA
LU
E -
$M
ILC value breakdown
Conventional Facilities Components
Main
Cost
Driver