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The ILC
From design to reality

Mitsuaki Nozaki (KEK/ACFA/AsiaHEP)



Slides prepared by Keisuke Fujii

PHYSICS@ILC


What Properties to Measure?
The Key is the Mass-Coupling Relation

Higgs Force Higgs Force

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Gauge Gauge Force Force

Properties to measure are mass, width, JPC Gauge quantum numbers (multiplet structure) Yukawa couplings Self-coupling The key is to measure the mass-coupling relation

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e+e- -> ZH e+e- -> ZH -> ZHH -> ZHH -> TTH -> TTH -> HH -> HH

Yukawa Yukawa Force Force

If the 125GeV boson is the one to give masses to all the SM particles, coupling should be proportional to mass. Any deviation from the Any deviation from the straight line signals BSM! straight line signals BSM!

ACFA Report

The Higgs is a window to BSM physics!
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Recoil Mass Measurement
The flagship measurement of ILC 250
What we measure is not BR itself but xBR. We need to extract BR! What we measure is not BR itself but xBR. We need to extract BR!

Recoil Mass

Invisible decay detectable!

ILD LoI scaled from mH=120 GeV

Model-independent absolute measurement of ZH (the HZZ coupling) ZH
Impossible at LHC Impossible at LHC


One of the major advantages of the LC (impossible at LHC)
To extract couplings from BRs, we need the total width:

Total Width and Coupling Extraction

To determine the total width, we need at least one partial width and corresponding BR:

There are two possibilities: A=Z, or W for which we can measure both the BRs and the couplings:

BR=O(1%): precision limited by low stat. for H->ZZ* events

More advantageous but not easy at low E
C.F.Durig, Helmholtz Alliance 6th WS, Dec. 2012

Higher energy (>350GeV) run needed !

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What force makes the Higgs condense in the vacuum?
We need to measure the Higgs self-coupling

Higgs Self-coupling

= We need to measure the shape of the Higgs potential

The measurement is very difficult even at ILC.
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Higgsinos in Natural SUSY (M ISR Tagging

Hale Sert ECFA LCWS 2013, DESY

Only very soft particles in the final states Require a hard ISR to kill huge two-photon BG!

2вM

2вM

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WHAT'S NEW

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A Precursor in February 2012
JHEPC issued "A Report on Future Projects of High Energy Physics."

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It all started on 4 July 2012

The discovery of Higgs accelerated the ILC promotion thereafter.
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A Quick Follow-up in October 2012
Japan Association of High Energy Physicists (JAHEP, Japan's HEP Community) Issued "A Proposal for a Phased Execution of the ILC."

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A Milestone Achieved in December 2012
Technical Design Report (TDR) has been completed after 8 years of concerted efforts world wide led by Barry Barish and was handed-over to ILCSC chair Jonathan Bagger.

The hand-over ceremony took place in Tokyo and the media was invited to witness the ceremony.
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A Step Forward in February 2013

The Linear Collider Collaboration (LCC) led by Lyn Evans has started working.

An eloquent Deputy and the Linear Collider Board (LCB) Chair. The JINR Director is the member of LCB.

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Access to Policy Makers in March/April 2013

A courtesy visit to Japan's Prime Minister
Takeo Kawamura, Chair of the Federation of Diet members in support of the ILC and former Chief Cabinet Secretary (right) and Daniel B. Poneman, Deputy Secretary of Energy (left) in Washington.

Japanese delegation visited Washington to "sell" the ILC.

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KEK Roadmap in May 2013
A major revision of the KEK Roadmap International Linear Collider (ILC) KEK will play a central role in creating an international preparatory group and will lead the effort on advanced R&D, the engineering design of the apparatus and facility, and the organizational design toward groundbreaking for the linear collider project to be hosted in Japan, within the framework of a global collaboration.

FYI; At the neutrino facility, a significant improvement in the measurement precision of the T2K experiment will be pursued. In addition, new research plans will be developed for the next generation of long-baseline neutrino oscillation experiments, while relevant preparatory studies are pushed forward in parallel.
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European Strategy in May 2013

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Ready for Construction in June 2013

After reviews, ILC-TDR was handed over to ICFA Chair.
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A Message from US in August 2013
A Snowmass summary

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A Message from Asia in August 2013
AsiaHEP/ACFA welcomes the proposal by the Japanese HEP community for the ILC to be hosted in Japan. AsiaHEP/ACFA looks forward to a proposal from the Japanese Government to initiate the ILC project. To be public soon.

AsiaHEP: Asia-Pacific High Energy Physics Panel, consisting of representatives from HEP communities and major HEP labs in Australia, China, India, Japan, Korea, Russia and Taiwan. (c.f. Vladimir Blinov (BINP) from "Asian part of Russia") ACFA: Asia Committee for Future Accelerators, consisting of particle/nuclear physics, photon/neutron science and accelerator communities in Australia, Bangladesh, China, India, Indonesia, Japan, Korea, Malaysia, Pakistan, Russia, Singapore, Taiwan, Thailand, and Vietnam. (c.f. Oleg Mashkov (BINP) and Grigori Shirkov (JINR))
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A Site in Japan was Chosen Recently

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A Site was Announced Last Week
August 17, 2013 The ILC site evaluation committee of Japan has assessed the two candidate sites based on technical and socio-environmental criteria and unanimously concluded as follows: The Kitakami site is evaluated to be the best domestic candidate site for the ILC. In addition, the committee strongly recommends the central campus of the Kitakami site to have a good environment for living and research and to be located near the Shinkansen line for convenient access to Sendai and Tokyo.

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Kitakami Site

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The Local City has Already been Prepared

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A Message from Science Council Soon
· In response to an inquiry from MEXT about ILC, SCJ set up an adhoc committee to answer. · A statement will be issued (probably) in September.
­ Reportedly the statement will include;
· Science case for the ILC is OK. · ILC should not affect other science research in Japan. · The government should start preparatory negotiation with potential partners to draft a detailed plan in a few years. · MEXT: Ministry of Education, Culture, Sports, Science and Technology · SCJ: Science Council of Japan, the highest level institution representing Japan's science community.
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A Message from ACFA/AsiaHEP Chair
· LCC will start shortly the engineering design for the ILC in Japan. · The Government of Japan may initiate a preparatory work by making a initial approach to a potential partner, hopefully. · Considering the achievements in HEP and accelerator science, there is no doubt that Russia is an important partner of the ILC project. · From Asia, Russia is too large to identify a single point of contact.
­ CERN member states are supposed to collaborate through CERN. ­ Major partners in Asia are expected to collaborate separately. ­ Minor partners in AsiaOceania are considering a way to join. A consortium? ­ What about Russia?

· Exciting years ahead of us!
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THANK YOU