1. Leaders: Katsuo TOKUSHUKU (KEK) Jean-Francois GRIVAZ (LAL)
LHC_04: Search for a low mass Higgs using the VBFττ and 4-leptons modes.
Leaders: Katsuo TOKUSHUKU (KEK)
Jean-Francois GRIVAZ (LAL)

2. Members French side (Orsay, LAL) Japanese side (KEK)
Jean-Francois Grivaz (Leader)
Jean-Baptiste De Vivie
Reisaburo Tanaka
Lydia Iconomidou-Fayard
Yu Nakahama
Jean-baptiste Sauvan
David Rousseau
Marthe Teinturier
Daniel Fournier
Arthur Schaffer
Japanese side (KEK)
Katsuo Tokushuku (Leader)
Masaya Ishino
Junichi Kanzaki
Soshi Tsuno
Kunihiro Nagano
Junji Tojo

3. Scope of the project
The discovery of the Higgs boson is the major goal of the LHC.
Higgs (depending on its mass) decays with various modes. – Combined information from different detectors is required to cover a wide mass region.
The kick-off meeting was held at CERN on 4/May. Useful information exchange took place.

4. Start of LHC physics program
Excitement of the first collisions (ECM=900GeV) on 23/Nov/2009,
7TeV Collisions on 30/March/2010.
3/3/2010

5. 2009
~10mb-1
Jun/2010
~15nb-1
2011
1fb-1
W, Z re-(re-)discovery is done.
Now reaching to the Top –level.
Higgs in 2011?

6. Higgs is hard to catch. -> Project toward 2014-15
Comination of H->VV and H->tau tau (and H-> g g) covers the most of the mass region.
Ecm=14TeV

7. But still there is small chances
If Higgs mass is ~160 GeV or
if SUSY-Higgs with a large tan(b) g H q H

8. Not yet Higgs ! but now we start seeing handful(3) Z’s
and several tens(57) W’s
(4.8 and 51.8 exepcted, resptvly)
First 900GeV Collisions were successfully recorded on 23/Nov/2009
3/3/2010

9. ATLAS Collaboration:
~3000 physicists from 173 Institutions and 37 Countries
Two-institute collaboration inside a large collaboration is important.

10. Why LAL- KEK collaboration?
Major LAL contributions
Major KEK contributions
Because we are complimentary
in detector experties and
in physics (KEK: tau/mu LAL: e/gamma)
3/3/2010

11. Detailed detector studies
Dead materials in front of LAr
Muon Trigger Timing
Photons will convert depending on the material amount in front of the calorimeter
Good Level-1 Trigger timing
Beam pipe
Pixel 1
Pixel 2
Pixel 3
SCT 1
SCT 2
Compare the conversion position of data and MC

12. J/psi seen in both ee and mumu modes

13. We like to see this in GeV scale!
And Mgg
We like to see this in GeV scale!

14. Planned Activities The kick-off meeting at CERN on 4/May.
A few collaboration meetings a year
at CERN or LAL/KEK (connected to
conference)
on detector status update,
signal objects (e, mu, tau)
reconstructions,
and then forming a physics analysis
team.
2010: ICHEP and Higgs workshop in Paris:
2011: Hadron collider physics (HCP) in Paris
2012: Hadron collider physcis (HCP) in Japan

15. Budget Request French side: support for a post-doc : 19800 euros
travel (2 x LAL -> KEK) : 4100 euros
Japanese side:
travel ( CERN -> LAL visits
+ 1 KEK-> LAL visit)
: 1020 k yen
(10000 euros)