Super B factory @ KEK - Super KEKB -
description
Transcript of Super B factory @ KEK - Super KEKB -
Super B factory @ KEK- Super KEKB -
B.G. Cheon
(Hanyang Univ., Seoul)
For the Belle collaboration
Physics motivation Accelerator and Detector Project schedule
June 16-21, SUSY08 @ Seoul, Korea
Belle highlights
SMBelle, 2005
AFB in BK*ll
X(3872)
Many new resonances
bdtransition
Evidence for B
Z(4430)
BD*D0-D0 mixing
CPV discovery
And more …
belle.kek.jp
Why KEK Super B factory ?
Many questions still remain in the SM. Something beyond SM should be there. Need more data to answer the questions.
KEKB/Belle achievement ~ 0.85 ab-1
Initial target ~ 10 ab-1 (limited funding) Final target ~ 50 ab-1
Physics at KEK Super B factory
New source ofNew source ofCP violationCP violation
New source of New source of flavor mixingflavor mixing
LFV LFV decays decays
SUSY breaking SUSY breaking mechanismmechanism
Precision test Precision test of KM schemeof KM scheme
Super-highSuper-high statistics statisticsmeasurements:measurements:
SS, sin, sin22WW, etc., etc.
Charm physicsCharm physics New resonances,New resonances, DD00DD00 mixing… mixing…
Item Super KEKB LHCb
BSM CP phase tCPV in b s penguin (Ks, ’ Ks, …)
Bs
BSM right-handed current tCPV in B K* Bs
Charged Higgs B B D(*) *
Inclusive measurements b s, b d, b sll *
D0-D0bar Mixing, DCPV Super-high statistics D decays O
Lepton Flavor Violation Super-high statistics decays *
BSM sensitive measurements
* Decay modes including / / can be accessed only with e+e- machines.
Flavor physics review talks are waiting for us on Wed. !!!
One example to find BSM Phases
SM: sin21 = sin21 from BJ/ K0 (bc c s)
unless there are other, non-SM particles in the loop
eff
Vts: no KM phase
Vtd
Vtd
+
1
B B
, ’,
1
, ’,
_
*
*
BSM effect may enter in b s
0SK
0B
b
s
s
sd d
0SK
0B
b
s
s
sd d
Many new phases are possible in
SUSY
New physics in loops?
O(1) effect allowedeven if SUSY scale is above 2TeV.
Method:
Compare S(K0) with S(J/K0)
SM prediction:
S S(K0)S(J/K0)
Smaller than bccs in 7 of 9 modesSmaller than bccs in 7 of 9 modes
Hints of NP in b s penguins ?
Theory predicts positive shifts
Naïve average of all b s modes
sin2eff = 0.56 ± 0.05
2.2 deviation from SM(CL=3%)
Naïve average of all b s modes
sin2eff = 0.56 ± 0.05
2.2 deviation from SM(CL=3%)
Integrated Luminosity
PEP-IIfor BaBar
KEKBfor Belle
KEKB + PEP-II
~ 1.4 Billion BB pairs~840/fb (Jun/10/08)~840/fb (Jun/10/08)
~531/fb (Apr/7/08)~531/fb (Apr/7/08)
design lu
minosity
May be time to switch units to ab-1Lpeak (KEKB) = 1.7 x 1034/cm2/sec (design 1.0)
KEKB upgrade - Super B factory @ KEK -
Crab cavityCrab cavity
3.5GeV e
8GeV e
New beam-pipeNew beam-pipewith ante-with ante-chamberchamber
DampingDampingring for ering for e++
New IR with crabNew IR with crabcrossing and crossing and
smaller smaller yy**
More RF for higherMore RF for higherbeam currentbeam current
SR
beam
e+ source
Ares RF cavity
SCC RF(HER)
ARES
(LER)
3.5 GeV e+
8 GeV e-
Upgrading the existing KEKB collider 3 years shutdown from 2009 Initial target ~ 2 x 1035/cm2s = 10 x KEKB Luminosity Final goal ~ 8 x 1035/cm2s , Integrated Lum.= 50 ab-1
Many components are now being tested.
K. Oide
1st layer
Expected Beam Background
Conservative, robust detector should be handled up to 20 times more background
Rad-Bhabha mask around QCS magnetIR chamber design
Results based on GEANT SIM validated by Belle/KEKB experience.
Features of Super Belle detector
- low p identification s recon. eff.- hermeticity “reconstruction”
- radiation damage and occupancy- fake hits and pile-up noise in the EM
- higher rate trigger, DAQ and computing
Issues: Higher background ( 20)
Higher event rate ( 50)
Required special features
In contrast to LHCb, superb neutral detection capabilities. e.g. BKS0 can be used to dete
ct right-handed currents.
Capable of observing rare “missing energy modes” e.g. BK with B tags.
Super Belle detector
Possible solution: Replace inner layers of the vertex detector with a silicon striplet or pixel detector Replace inner part of the central tracker with a silicon strip detector. Better particle identification device (TOP) focussing DIRC (fDIRC) Replace endcap calorimeter by pure CsI. Faster readout electronics and computing
Possible solution: Replace inner layers of the vertex detector with a silicon striplet or pixel detector Replace inner part of the central tracker with a silicon strip detector. Better particle identification device (TOP) focussing DIRC (fDIRC) Replace endcap calorimeter by pure CsI. Faster readout electronics and computing
New dead time free pipelined readout and
high speed computing systems
Faster calorimeter with waveform sampling and pure CsI crystals
New particle identifier with precise Cherenkov device:
TOP or fDIRC.
Si vertex detector withhigh background
tolerance (striplets or pixels)
Background tolerant super small celltracking detector
KL/ detectionwith scintillator
and next generationphoton sensors
Korean group contribution : Calorimeter trigger system construction CDC Tracker z-trigger system implement SVD silicon strip sensor R&D
(5 Year Plan)
KEK Web page
+20 page report
2006 2008 2010 2012 2014 2016 2018
KEK Roadmap
• KEKB
• PF/PF-AR
Detector R&D
• J-PARC
ILCILC R&D
construction
experiment + upgrade
PF-ERL
• R&D for Advanced Accelerator and Detector Technology
ERL
R&D construction experiment
C-ERL R&D
• LHC
construction experiment + upgrade
construction test experiment
experiment upgrade experiment + upgrade
construction experiment + upgrade
upgrade
Very P
relim
inary
2007 2008 2009 2010
Experiment at KEKB
4 71 10 414 71 104 71 104 71 1010
2011 2012
KEKB/Belle upgrade
DetectorStudy Report(March 08)
Final detectordesign(April 09)
Pre kick-off meeting(March 08)
2007 2008 20094 71 1 42 1010 3 5 8 9 11 12 2 311 12 6
Detector proposals Internal review
TDR
BNM(January 08)
One-day general meeting and an IB meeting at every BGM
Meeting plan
Actions to invite new collaborators
2nd openmeeting(July 08)
Tight Schedule for the Super KEKB Collaboration
(inc. PID shootout)
**
** Possible 6-month shift to the right
Conclusions
Super KEKB is a special opportunity for high impact international collaboration.
KEKB is moving ahead with a machine and detector designed to discover new sources of flavor mixing and CPV.
The accelerator and detector have a track record of exceeding expectations.
Super KEKB and LHCb are complementary.
Backup slides
Major Achievements Expected at SuperKEKB: An Image
Discovery of new CPV phase in B K (for present WA)
Discovery of B K
Discovery of B D
Precise meas. of D mixing
CKM Angle Measurements with 1 degree precision
Discovery of CP Violation in Charged B Decays
Discovery of Direct CP Violation in B0 K Decays (2005)
Discovery of CP Violation in Neutral B Meson System (2001)
Discovery of B
New CP-Violating Phase in b s with 1 degree precision
“Discovery” withsigfinicance > 5
Discovery of New Subatmic Particles
sin2W with O(10-4) precision
Observations with (5S), (3S) etc.
Search for new right-handed currents through CP violation
• SM Electroweak: purely left-handed
• New right-handed current R
_B0
almost purely left-handed photonalmost purely left-handed photon
Ks 0
described withan amplitudefor a left-handedphoton: L
Interference b/w Land R Large CP violationInterference b/w Land R Large CP violation
Atwood-Gronau-Soni 1997Atwood-Gershon-Hazumi-Soni 2005
Identification of SUSY breaking scenario
Bd- unitarity
m(Bs)
B->Ks B->Ms indirect CP
b->s direct CP
mSUGRA - - - - - +SU(5)SUSY GUT + R
(degenerate)
- + + - + -
SU(5)SUSY GUT + R
(non-degenerate)
- - + ++ ++ +
U(2) Flavor symmetry
+ + + ++ ++ ++++: Large, +: sizable, -: small
Observ-ables
SUSYmodels
Pattern of deviations from the Standard Model Y.Okada
Principle of a TOP counter
Linear array PMT (~5mm)Time resolution ~40ps
~2m
K
Simulation2GeV/c, =90 deg.
~200ps
Different propagation lengths propagation times
(Measure 1D position and time in a compact detector)Provides ~4σ /K separation at 3.5 GeV/c