1. Status of SuperKEKB
May 11, 2007
SuperB Workshop
Masa Yamauchi
KEK

2. Conditions for SuperKEKB
Physics case
Detector
design
Machine design
SuperKEKB
Support from
domestic/int’l
community
Funding

3. Milestones toward approval
Japanese
HEP community
Academy of Science
CSTP
LoI
June 2004
KEK’s
decision
MEXT
MOF
Support from the
int’l HEP community
Review panel
Review
committee

4. Consensus in J-HEP community
Japanese HEP community reached the following agreement in October 2006 after a long discussion.
First priority is to realize ILC, and its R&D should be boosted. On the other hand, flavour physics programs (SuperKEKB, and K and n program at J-PARC) should be carried out as physics programs before ILC (i.e., 2010’s).

5. Recommendation by Belle-PAC
The committee provided strong endorsement to SuperKEKB in the meeting in 2007.
This is also an important support from the int’l community.

6. J-PARC n, n construction
2006
2008
2010
2012
2014
2016
2018
2020
J-PARC n, n construction
J-PARC R&D
J-PARC n, K experiment
J-PARC n, m experiment
upgrade
Budget transfer
PF upgrade PF
Budget transfer
ERL prototype
ERL construction
experiment
KEKB
ILC R&D
ILC construction
experiment
Budget transfer
Option 1
KEKB
ILC R&D
ILC construction
experiment
KEKB upgrade
Budget transfer
Option 1’

7. J-PARC = Japan Proton Accelerator Research Complex
J - PARC ( Tokai )
J-PARC = Japan Proton Accelerator Research Complex
Hadron Beam Facility
Materials and Life Science
Experimental Facility
50 GeV Synchrotron
(0.75 MW)
Neutrino to Super-Kamiokande
3 GeV Synchrotron
(25 Hz, 1MW)
Linac
(330m)
Joint Project between KEK and JAEA

8. Joint effort with European SuperB
Common assumption: there will be at most one Super B Factory built in the world.
It is implicitly assumed that Western and Eastern SuperB’s will be merged into a single project in some future.
We now have four options:
(high current or low beta) x (KEK or Rome)
None of the options should be thrown away at this point.
Close communication is going on.
Frequent visits and telephone meetings to exchange status report and ideas
Joint meeting in Paris (i.e., this meeting), where support letter will be signed.
Third joint workshop to be scheduled sometime in fall 2007(?).
Joint detector R&D program will be arranged.

9. Detector issue: background
x20 Bkg
KEKB
SuperB
Luminosity
(1034cm-2sec-1)
1.7 80
HER curr. (A)
LER curr. (A)
vacuum (10-7Pa)
1.2
1.6
~1.5
4.1
9.4 5
Bkg increase -
x 20
TRG rate (kHz)
phys. origin
Bkg origin
0.4
0.2 14 10 4
x10 Bkg
KEKB
Bkg
SVD
CDC
PID / ECL
KLM
Shynchrotoron radiation
Beam-gas scattering (inc. intra-beam scattering)
Radiative Bhabha

10. Super Belle Faster calorimeter with Wave sampling and pure CsI crystal
Particle identifier with
precise Cherenkov device
KL/m detection
with scintillator
and new generation
photon sensors
Background tolerant
super small cell
tracking detector
New Dead time free
readout and
high speed
computing systems
Si vertex detector with
high background
tolerance

12. Summary 2008 will be a critical timing for KEKB/SuperKEKB.
J-PARC construction will be completed.
Belle accumulates 1000/fb.
PEP-II/BaBar will be shutdown.
It is likely that KEK takes some decision soon.
Machine: KEK + contributions from the world
Detector: perfectly open to the new collaboration
Hope to strengthen collaboration with Western SuperB.