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