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
Introduction
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.
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
Scenarios ⇔ Questions
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]
Higgs-dependence Day
Perfect?Higgs Lamp Post
MH = 125 GeV JP = 0+
v=246 GeV ↓
m[W, Z, f, H]
[H Murayama]
[Nobel prize website]
3 Major Frontiers
Omni-directional Exploration
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
Energy Frontier Proposals
[For details, Yamamoto’s talk]
LHC ☞ ILC
real design[Yokoya’s talk]
Most feasible and realistic
[Yokoya & ES Kim][Yamamoto & IH Park]
Two-minute Introduction
Clean and Controllable
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)μDark matter
…
[SH Jung’s talk]
Clarified more by next LHC experiments
GigaZ
Standard Physics (Higgs)
[For details, see Tanabe’s talk]
Precision
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!
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]
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
Model-independent x-section and coupling measurement
A dream case
New particles are around 1 TeV
Coupling measure-ments
[For details, see Tanabe’s talk]
Clear and big improvement from ILC measurements?!
[Peskin]
Any deviation from the straight line ⇒ BSM physics
Putting everything together
SM Higgs Mechanism: Mass ∝ Coupling
[ILC TDR 2013]
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]
New Physics(SUSY)
[For details, see Tanabe’s talk]
Complementary
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
Natural hierarchy, unification, DM, (g-2)μ, more Higgs bosons, etc
SUSY as a Show CaseStill the best BSM scenario?!
Case 1: DM – Is it a particle?
“Particle concept” has been working so far!
[Ellis, 2013]
DM : Lightest neutralino
DM could be reconstructed to match astrophysical data!?
[ILC TDR 2013]
Case 2: Anomalous (g-2)μ
[Benayoun, David, DelBuono, Jegerlehner, 2012]
More than 4 σ deviation ⇒ real? SM physics?!
SUSY easily explains the deviation
Experimental data indicatenot too heavy smuons /sneutrinos
not too heavy charginos/neutralinos
Precision SUSY spectroscopy at ILCif kinematically accessible
[ILC TDR 2013]
(sub)per-cent precision possible at ILC
Precision ILC analyses
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)
LHC
ILC
Could be a unique opportunity for the ILC!
Crucial to take into account all decay channels
Huge reduction of excluded parameter space
[Heinemeyer @ LCWS 13]
[Heine-meyer]
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
How to go ahead
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 ApproachesILC as a Higgs and top factory
Start at lower energies to produce ~0.1 million Higgs bosonsGo to higher energies for top physics
Go to higher energies for Higgs + top and Higgs self-couplings
Go to higher energies for TeV scale explorationor
Other options : GigaZ, photon colliders etc
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]
Back-up Slides
2013 Nobel Prize in Physics
Higgs Self-Coupling
Clear and strong improvement from ILC measurements??
[SFitter 2013]
Higgs Mass and Width
Perfect agreement with the Standard Model
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