ILC TDR v2: Physics, arXiv: ILC TDR Launch ILC TDR Launch Brock and Snowmass 2013 Snowmass 2013 H LP 2013 H LP2013 Various Google Images … 10th LHC Physics Monthly 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 the fundamental 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 Naturalness Matter Asymmetry Dark Matter Dark 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 disputations about the Greatest Questions that fail to lead to any truth whatever. Galileo Galilei [Quigg]

Higgs-dependence Day

Perfect? Higgs Lamp Post M H = 125 GeV J P = 0 + v=246 GeV ↓ m[W, Z, f, H] [H Murayama] [Nobel prize website]

3 Major Frontiers Omni-directional Exploration

Precision experiments Discovery through inducing quantum loops Neutrino experiments Discovery by inducing quantum mixing Astrophysical experiments Discovery by capturing cosmic quanta Colliding beam experiments Discovery 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 particle Top 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

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 program Experimental and theoretical requirements Projections of Higgs coupling accuracy Measurement potential at future colliders Projection of Higgs property studies Mass, spin-parity, CP mixture, etc Extended Higgs boson sectors Phenomenology 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 decade Interesting precision begins with 300/fb running Success requires considerable theoretical effort Lepton colliders are required in order to measure sub-% precision in couplings in a model-independent fashion With 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 measurements [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 M W/Z UA1/UA2 discovered W/Z bosons LEP nailed the SM gauge sector Precision W/Z measurements predicted M H 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 open Dark 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-lived Strongly 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 Case Still 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 indicate not too heavy smuons /sneutrinos not too heavy charginos/neutralinos Precision SUSY spectroscopy at ILC if 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 Higgs Direct searches for other heavier neutral Higgses Direct searches for the charged Higgses Flavor 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 LCWS 13]

[Heinemeyer]

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 Approaches ILC as a Higgs and top factory Start at lower energies to produce ~0.1 million Higgs bosons Go to higher energies for top physics Go to higher energies for Higgs + top and Higgs self-couplings Go to higher energies for TeV scale exploration or 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, can get 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

Energy7-14 TeV0.25 – 1 TeV Useful energypartlyall Beamproton (complex)electron (point) Signalhighlow noisevery highlow analysisspecificalmost all eventsnot allall statusrealR&D LHC ⇔ ILC