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ILC TDR v2: Physics, arXiv:1306.6352Heinemeyer @ ILC TDR Launch
Lykken @ ILC TDR LaunchBrock and Peskin @ Snowmass 2013
Shipsey @ Snowmass 2013H Yamamoto @ LP 2013H Murayama @ LP2013Various Google Images
…
10th LHC Physics Monthly Meeting @ KIAS on 13/Dec/2013
S.Y. Choi (Chonbuk, Korea)
LHC ☞ ILC Physics : Why & How
Introduction (ILC)Standard Physics (Higgs)
New Physics (SUSY)How to go ahead
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Introduction
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Cosmic Uroboros
Particle physics studies thefundamental nature of energy,matter, space and time, and
applies the knowledge to understand the birth, evolution
and fate of the Universe.
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Neutrino Mass Theory of Flavor
Higgs Boson NaturalnessMatter Asymmetry
Dark MatterDark Energy
Inflation…
What we know is a droplet, while
what we don’t know is an ocean
Mysteries of the Universe (a partial list)[Fermi Today
Nov/15, 2013]
TeV-scale
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Scenarios ⇔ Questions
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I attach more value to finding a fact, even about the slightest thing, than to lengthy disputa-tions about the Greatest Ques-
tions that fail to lead to any truth whatever.
Galileo Galilei
[Quigg]
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Higgs-dependence Day
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Perfect?Higgs Lamp Post
MH = 125 GeV JP = 0+
v=246 GeV ↓
m[W, Z, f, H]
[H Murayama]
[Nobel prize website]
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3 Major Frontiers
Omni-directional Exploration
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Precision experimentsDiscovery through inducing quantum loops
Neutrino experimentsDiscovery by inducing quantum mixing
Astrophysical experimentsDiscovery by capturing cosmic quanta
Colliding beam experimentsDiscovery by producing on-shell states
…
Entangled Approaches
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Energy Frontier Proposals
[For details, Yamamoto’s talk]
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LHC ☞ ILC
real design
[Yokoya’s talk]
Most feasible and realistic
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[Yokoya & ES Kim][Yamamoto & IH Park]
Two-minute Introduction
Clean and Controllable
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Physics at the ILC : determined by experimental data
A Higgs particleTop quark
Gauge bosons : W and Z…
Clear physics case
“Likely” (additional) physics case
Anomalous (g-2)μ
Dark matter…
[SH Jung’s talk]
Clarified more by next LHC experiments
GigaZ
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Standard Physics (Higgs)
[For details, see Tanabe’s talk]
Precision
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The new world with a Higgs discovery
Time to analyze!!!
Urgent experimental checks for the SM Higgs boson or not
elementary and single?
Any deviation ⇒ BSM physics!
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Outline of a precision Higgs programExperimental and theoretical requirements
Projections of Higgs coupling accuracyMeasurement potential at future colliders
Projection of Higgs property studiesMass, spin-parity, CP mixture, etc
Extended Higgs boson sectorsPhenomenology and prospects for discovery
Higgs Themes
[P Ko’s talk]
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Models with new TeV-scale particles give corrections to Higgs couplings of a few %
An experimental program to determine these couplings is achievable
LHC is the facility to study Higgs in the next decadeInteresting precision begins with 300/fb runningSuccess requires considerable theoretical effort
Lepton colliders are required in order to measure sub-% precision in couplings
in a model-independent fashionWith access to invisible and exotic decay modes
Higgs Couplings
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Model-independent x-section and coupling measurement
A dream case
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New particles are around 1 TeV
Coupling measure-ments
[For details, see Tanabe’s talk]
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Clear and big improvement from ILC measurements?!
[Peskin]
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Any deviation from the straight line ⇒ BSM physics
Putting everything together
SM Higgs Mechanism: Mass ∝ Coupling
[ILC TDR 2013]
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Precision neutral-current measurements predicted MW/Z
UA1/UA2 discovered W/Z bosonsLEP nailed the SM gauge sector
Precision W/Z measurements predicted MH LHC discovered a Higgs particle
ILC nails the Higgs sector
Precision H measurements predict ?
?????
Repeated History of Collider Experiments?
[H Murayama]
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New Physics(SUSY)
[For details, see Tanabe’s talk]
Complementary
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The questions of fine tuning is still openDark matter (particle) is not included
Neutrino masses are not included(g-2)μ with ~4σ discrepancy
Gravity is not included…
TeV-scale particle candidates
Weakly coupled: SUSY, DM, Long-livedStrongly coupled/composite: RS, KK and Z’, long-lived
…Evolution towards robust search strategies
SM is NOT the ultimate theory
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Natural hierarchy, unification, DM, (g-2)μ, more Higgs bosons, etc
SUSY as a Show Case
Still the best BSM scenario?!
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Case 1: DM – Is it a particle?
“Particle concept” has been working so far!
[Ellis, 2013]
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DM : Lightest neutralino
DM could be reconstructed to match astrophysical data!?
[ILC TDR 2013]
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Case 2: Anomalous (g-2)μ
[Benayoun, David, DelBuono, Jegerlehner, 2012]
More than 4 σ deviation ⇒ real? SM physics?!
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SUSY easily explains the deviation
Experimental data indicatenot too heavy smuons /sneutrinos
not too heavy charginos/neutralinos
Precision SUSY spectroscopy at ILCif kinematically accessible
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[ILC TDR 2013]
(sub)per-cent precision possible at ILC
Precision ILC analyses
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Case 3: Light Higgs below 125 GeV
The discovered 125 GeV Higgs might not be the lightest Higgs in the spectrum!
Several light Higgs bosons ⇒ Rich Higgs phenomenology
Constraints
Direct searches for the lightest HiggsDirect searches for other heavier neutral Higgses
Direct searches for the charged HiggsesFlavor constraints (e.g. Bs to muon pairs)
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LHC
ILC
Could be a unique opportunity for the ILC!
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Crucial to take into account all decay channels
Huge reduction of excluded parameter space
[Heinemeyer @ LCWS 13]
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[Heine-meyer]
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Case 4: LHC finds only a SM-like Higgs and nothing else
ILC + GigaZ
Precise Higgs measurement (ILC)Precision observable measurements (GigaZ)
Precise top measurement (ILC+GigaZ)
Any significant deviations from the SM
predictions could be observed at ILC
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How to go ahead
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A Meaningful Majority Opinion
Discovery of a Higgs particle together with W/Z, top, DM, (g-2)μ, … comprises a perfect
physics case for the ILC
Staged Approaches
ILC as a Higgs and top factoryStart at lower energies to produce ~0.1 million Higgs bosons
Go to higher energies for top physicsGo to higher energies for Higgs + top and Higgs self-couplings
Go to higher energies for TeV scale explorationor
Other options : GigaZ, photon colliders etc
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The Higgs discovery marks the dawn of a new era!
ILC, fueled by a global program on many fronts, canget us to a new paradigm of fundamental physics!!
ILC on the Launch Pad [Lykken]
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Back-up Slides
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2013 Nobel Prize in Physics
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Higgs Self-Coupling
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Clear and strong improvement from ILC measurements??
[SFitter 2013]
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Higgs Mass and Width
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Perfect agreement with the Standard Model
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Energy 7-14 TeV 0.25 – 1 TeV
Useful energy partly all
Beam proton (com-plex)
electron (point)
Signal high low
noise very high low
analysis specific almost all
events not all all
status real R&D
LHC ⇔ ILC
www.cern.ch www.linearcollider.orgwww.interactions.org