ILC （前座） ＪＰＳ Ｍｅｅｔｉｎｇ 23 March 2008 Kinki University (Osaka) Sachio Komamiya Department of Physics and ICEPP, The University of Tokyo Subordinate of the.

ILCILC 　　

（前座）（前座）

ＪＰＳ　ＭｅｅｔｉｎｇＪＰＳ　Ｍｅｅｔｉｎｇ23 March 200823 March 2008

Kinki University (Osaka)Kinki University (Osaka)

Sachio KomamiyaSachio KomamiyaDepartment of Physics and ICEPP,Department of Physics and ICEPP,

The University of TokyoThe University of Tokyo

Subordinate of the principle speakers: Barry Barish and Sakue Yamada

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Global understanding of the field:

We are at the entrance of the revolutionary epoch of We are at the entrance of the revolutionary epoch of particle physics.particle physics.

The outstanding problems of particle physics can be The outstanding problems of particle physics can be solved by direct measurements at the energy frontier solved by direct measurements at the energy frontier colliders (examine first results at LHC and then ILC).colliders (examine first results at LHC and then ILC). Higgs (EWSB, mass ⇔ structure of the vacuum)Higgs (EWSB, mass ⇔ structure of the vacuum) SUSY (or alternative, TeV scale new physics)SUSY (or alternative, TeV scale new physics)

The scientific indispensability of the Linear Collider has never changed.

The International Linear Collider is the highest priority project in high energy physics after the LHC construction

Three pillars of the Standard Three pillars of the Standard Model Model

The material is made up with Quarks and LeptonsThe material is made up with Quarks and Leptons　　　　 3 Generations×4 Types 3 Generations×4 Types ＝＝ 12 Flavors12 Flavors All discoveredAll discovered

☑☑ Forces between particles are mediated by Gauge Forces between particles are mediated by Gauge

Bosons Bosons 　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　 All discovered. Precise tests at LEP et al.All discovered. Precise tests at LEP et al. ☑☑ Higgs Boson breaks Gauge Symmetry ⇒ Origin of MassHiggs Boson breaks Gauge Symmetry ⇒ Origin of Mass　　 　　 (not yet experimentally proven)(not yet experimentally proven)

Lep

ton

s

Qu

ark

s

Gau

ge

Inte

racti

on

s

Hig

gs

Boso

n

The Standard Model was established in the very end of the last millennium by a combined experimental and theoretical studies.

Energy budget of the Energy budget of the

UniverseUniverse (1) CBR fluctuation (WMAP et (1) CBR fluctuation (WMAP et al.)al.)(2) Large scale structure of (2) Large scale structure of galaxy cluster distributiongalaxy cluster distribution(3) Type 1a SN distribution(3) Type 1a SN distribution(4) Big Bang Nuclear Synthesis(4) Big Bang Nuclear Synthesis

We only know 5% of the We only know 5% of the universe. universe. Dark Matter: LSP of SUSY ? Dark Matter: LSP of SUSY ? Dark Energy/Inflation: Dark Energy/Inflation: Scalar particle with the Scalar particle with the vacuum quantum vacuum quantum number ???number ??? 　　

Cosmology vs Particle Physics

So many things are not So many things are not understoodunderstood

Why there are three generations of quarks and leptons with different Why there are three generations of quarks and leptons with different masses ?masses ?

(Why neutrinos are so light and top quark is so heavy ?) (Why neutrinos are so light and top quark is so heavy ?) Is there a fundamental Higgs boson ? Relation between mass and Is there a fundamental Higgs boson ? Relation between mass and

vacuum structure ?vacuum structure ? Why there are four kinds of interactions ?Why there are four kinds of interactions ? Unification with the Unification with the

gravity ? gravity ? Why the space-time has 3+1 dimensions ? Are there any extra-Why the space-time has 3+1 dimensions ? Are there any extra-

dimensions ?dimensions ? What is the dark matter ?What is the dark matter ? What is the dark energy ?What is the dark energy ? Where Do We Come From? Where Do We Come From? What Are We? What Are We? Where Are We Going?Where Are We Going?

Some of these questions canSome of these questions can

be answered bybe answered by LHC/ILC. LHC/ILC.

Yoichiro Nambu (Chicago) pioneer of many theoretical ideas

History of Synergy between History of Synergy between Hadron-hadron and eHadron-hadron and e++ee- - Collision Collision

ExperimentsExperiments

Charm quarkCharm quark AGS/SPEARAGS/SPEAR (1974 November (1974 November Revolution)Revolution)

Tau Tau SPEARSPEAR Bottom quarkBottom quark FermilabFermilab/DORIS-II/B-Factories/DORIS-II/B-Factories Gluons Gluons Scaling Violation, Jet pScaling Violation, Jet pt t DistributionDistribution / /PETRAPETRA Weak BosonsWeak Bosons SppSSppS/LEP, SLC(Z)/LEP, SLC(Z) Top quarkTop quark (LEP)/(LEP)/TEVATRONTEVATRON Higgs Boson (LEP,TEVATRON)/LHC/ILCHiggs Boson (LEP,TEVATRON)/LHC/ILC SUSY particles LHC/ILCSUSY particles LHC/ILC

Story of Top Quark and Higgs Story of Top Quark and Higgs BosonBoson

From precise electro-weak measurements at LEP, top mass was predicted

Precise Measurement of Top mass at the TEVATRON

Higgs mass is restricted to a narrow range using precise top mass and LEP electro-weak data

Discovery to Top

Discovery of Higgs at LHC

Precise measurements of Higgs properties at ILC

top

Higgs

Z ZZZ

Detector Issues (⇒Sakue’s Detector Issues (⇒Sakue’s Talk)Talk)

Balance between

The highest physics outcome : Put all the budget into one state-of-the-art detector by a truly international collaboration might be more effective.

In order to cross-check the results In order to cross-check the results at least two at least two detectors detectors are needed (parameter are needed (parameter committee ILCSC)committee ILCSC)

The sociology of the community:The ILC physics/detector community is large The ILC physics/detector community is large enough to have two detectors. We need some enough to have two detectors. We need some competition.competition. ATLAS/CMS, H1/ZEUS, BaBar/Belle, …ATLAS/CMS, H1/ZEUS, BaBar/Belle, …

SiD LDC GLD

ATLAS@LHC

Diameter 25 mBarrel toroid length 26 mEnd-cap end-wall chamber span 46 mOverall weight 7000 TonsDetector sensors 110M channels

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ILD

As the experimental environment is clean at ILC, state-of-the-art detectors are able to be and have to be build .

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ILD

??

???

We do not know what will happen

Grand Grand UnificationUnification

ILD

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??? ?

Accelerator Issues Accelerator Issues (⇒Barry’s talk)(⇒Barry’s talk)

Cost reduction with risk management

Heroic efforts of further cost reduction is going on by GDE lead by Barry.

In the R&D and design stage, accelerator physicists/engineers need to keep high motivation and creativeness which are essential for further breakthrough in high performance and further cost reduction with keeping the risk level low. We need to identify the components for plug-compatible approach. This might be an efficient way for the truly efficient international collaboration towards industrialization, since all the components cannot be fabricated in one country. (Akira Yamamoto)

Machine Parameters

After the first LHC results, we (ILCSC) have to go back to the parameter optimization. We need to prepare for the situation.

Collaboration with CLIC

Although the level of technological maturity is very different, it is worth collaborating with CLIC for possible common items. ⇒ CERN involvement

ILCSC ILCSC

Current Members:Current Members: Large Lab DirectorsLarge Lab Directors: :

Robert Aymar, Albrecht Wagner, Pier Oddone, Robert Aymar, Albrecht Wagner, Pier Oddone, Atsuto Suzuki, Persis Drell Atsuto Suzuki, Persis Drell

Chair of Regional LC Steering CommitteeChair of Regional LC Steering Committee: : Won Namkung, Karlheinz Meier, Satoshi Won Namkung, Karlheinz Meier, Satoshi OzakiOzaki

ChairChair: Enzo Iarocci: Enzo Iarocci China, Russia, OtherChina, Russia, Other: :

Hesheng Chen, Alexander Skrinsky, Shin- Hesheng Chen, Alexander Skrinsky, Shin-Chang LeeChang Lee

Rep. of Regional CommunityRep. of Regional Community: : Sachio Komamiya, Francois Richard, Jim Brau Sachio Komamiya, Francois Richard, Jim Brau

SecretarySecretary: Roy Rubinstein: Roy Rubinstein

Primary role: Promote the construction of an Electron-positron Linear Collider through world-wide collaboration. In so doing the Committee will give particular attention to outreach, science, technology and organization of the LC project.

2002: ILCSC was established by ICFA at ICHEP 2002: ILCSC was established by ICFA at ICHEP Amsterdam The first ILCSC chair: M. TignerAmsterdam The first ILCSC chair: M. Tigner

2003: ITRP (International Technology Review Panel) was 2003: ITRP (International Technology Review Panel) was started. chair: B. Barishstarted. chair: B. Barish

2004: ITRP chose superconducting technology for the 2004: ITRP chose superconducting technology for the main linac. Report to ILCSC/ICFA at ICHEP Beijingmain linac. Report to ILCSC/ICFA at ICHEP Beijing

First ILC workshop in KEKFirst ILC workshop in KEK

2005: Establish GDE(Global Design Effort) 2005: Establish GDE(Global Design Effort) director: B. Barishdirector: B. Barish Second ILC Workshop in Snowmass Second ILC Workshop in Snowmass chair: Shin-ichi Kurokawa chair: Shin-ichi Kurokawa

2007: RDR report with cost from GDE to ILCSC/ICFA 2007: RDR report with cost from GDE to ILCSC/ICFA at Beijing LCWS07at Beijing LCWS07

Chair: Enzo IarocciChair: Enzo Iarocci Black December Black December 2008: Tohoku ACFA-LCWS +2008: Tohoku ACFA-LCWS + GDEGDE

International Technology Review Panel

Feb. 2007

GDE: ILC RDR was handed to ICFA chair (Albrecht Wagner)

Barry Barish (Caltech )Director of GDE (Global Design Effort)

Energy, Leadership, Challenging Spirit

Wisdom, Leadership

High cultural physicist

Research Director of ILC Experiments

Sakue Yamada (KEK/Tokyo)

SummarySummary

After the December Reaction (black After the December Reaction (black December) last year, the community gains December) last year, the community gains even tighter solidarity and stronger strategy.even tighter solidarity and stronger strategy.

We should be prepared for the first We should be prepared for the first significant LHC physics results expected significant LHC physics results expected within a few years to realize the within a few years to realize the International Linear Collider project. International Linear Collider project.

⇒⇒ Barry and Sakue Barry and Sakue （真打登場！）（真打登場！）