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Super B factory plan at KEK. Why, how, what, who, when and how much?. Super B Factory Workshop April 20-22, 2005 Honolulu. Masa Yamauchi KEK. Why? - Roadmap of B Physics. Identification of SUSY breaking mechanism. Anomalous CPV in b g sss. sin2 f 1 , CPV in B g pp , - PowerPoint PPT Presentation
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Super B factory plan at KEK
Masa YamauchiKEK
Super B Factory WorkshopApril 20-22, 2005 Honolulu
Why, how, what, who, when and how much?
Discovery of CPV in B decays
Study of NP effect in B and decays
Identification of SUSY breaking mechanism
time or
integrated luminosity
Yes!!
sin21, CPV in B,3, Vub, Vcb, bs,bsll, new states etc.
AnomalousCPV in bsss
NP discoveredat LHC(2010?)
Now400 fb-1
if NP=SUSY
Why? - Roadmap of B Physics
Precise test of SMand search for NP
Motivations for Super KEKB
Once New Physics is discovered and its mass scale is determined, next is to study its flavor structure and CP violation, where B physics can play a unique role.
TCPV in b→sss ≠ b→ccs : 3.8 Polarization in penguin dominated B→VV decays ACP(B±→K± 0) ≠ ACP(B0→K± )
±
1. Possible anomalies observed in B decays
2. New physics will be found soon at LHC.
3. ee B factory with L=3.5×1035 is competitive with LHCb.
These MUST be clarified.
Anomalous CPV hints new physics?
-f x Sf
Belle + BaBar, 2004
top
W
penguin decay
Ave. CPV = 0.41±0.07
Ave. CPV = 0.726±0.037
equalif only SM
3.8 deviationobserved
Tree decayb c
c
d s
d_
_
_B
J/
KS
W
Other Evidences for New Physics
fL (B→VV)ACP(B→Kπ)
Comparison with LHCb
hep-ex/0406071SuperKEKB LoI
Comparison K* (which is Golden mode at LHCb) yield by LHCb is 2.7
times larger than K*ll yield by Super Belle. Need 1036 machine and better detector(PID, vertex)/analysis.
A7 is fixed to the value obtained from bs LHCb cannot measure B(bs), so they should use our value
or float A7.
K*l+l- evts/yearS/N
A9 A10 A7 from bs
s0
LoI Belle(e + )
N.A.N.A.
32% 44% 2.5(exp)+2.5(theo)%?
32%
Toy Belle(e + )
16401.7
11% 13%. 2.5(exp)+2.5(theo)%?
11%
LHCb( only)
4400>0.5
6.5%* 6.9%* N.A. 7.4%If A7 is fixed.
3 times better
*just scaling Belle value with evts.
A.Ishikawa6th Workshop on Higher Lum. B FactoriesNovember 2004
How? - SuperKEKB Parameters
Crab Cavity
Interaction RegionCrab crossing
=30mrad.y*=3mm
New QCS
What? – SuperKEKB Design
Linac upgrade
More RF power
Damping ring
New Beam pipe
L
2ere
Iy
y*RLRy
Increase beam currents•1.6 A (LER) / 1.2 A (HER) → 9.6 A (LER) / 4.1 A (HER)
Smaller y*
• 6 mm→3 mm
Increase y
• 0.05→0.28(W-S)
L=3.5x1035cm-2s-1
8GeV (e+, 4.1A) 3.5GeV (e-, 9.6A)
Super-KEKB (cont’d)
Head-on collision w/ Crab cavityNew crab cavity
Ante-chamber /solenoid for reduction of electron clouds
Circular-chamber
Build-up ofelectron clouds
Ante-chamberAnte-chamberwith solenoid field
Will be tested in 2006.
Fight for Higher Beam Current
ARES for SuperKEKB
SCC for SuperKEKB
KEKB Upgrade Scenario
~1010 BB/year !!& similar number
of +-
Lpeak = 1.41034cm-2s-1
Ltot = 330fb-1 (Nov.30, 2004)
1.4x1034
330 fb-1
5x1034
~1 ab-1
5x1035
~10 ab-1
Lpeak (cm-2s-1)Lint
Crabcavities
Major upgrade ofKEKB & Belle detector(>1yr shutdown)
world records !
Belle Upgrade
SC solenoid1.5T
New readout and computing systems
CsI(Tl) 16X0
pure CsI (endcap) Aerogel Cherenkov counter + TOF counter
“TOP” + RICH
Si vtx. det. 4 lyr. DSSD 2 pixel/striplet lyrs. + 4 lyr. DSSD
Tracking + dE/dx small cell + He/C2H5
remove inner lyrs.
Use fast gas
/ KL detection 14/15 lyr. RPC+Fe
tile scintillator
Q1: Does DC work with L=3.51035?
If NO,– Need Si tracker.– EM cal, solenoid and iron structure have to be
rebuilt!!
If YES,– Upgrade the present Belle detector.
New detector
87.57
6.56
5.5
4
3.532.5
21.51
0.5
4.55
HER Radiative Bhabhas
32.5
2 1.51
0.5
LER Radiative Bhabhas
-7.5 -5 -2.5 0 2.5 5 7.5
0
10
20
30
-10
-20
-30
m
cm
M. SullivanFeb. 8, 2004API88k3_R5_RADBHA_TOT_7_5M
3.1 G
eV
3.1 G
eV
9 GeV
9 GeV
PEP-II Radiative Bhabhas
LER radiative gammas
0.511.5
22.5
3
LER radiative bhabhas
HER radiative gammas
7654
0.5
1
2
3
HER radiative bhabhas
KEKB Interaction Region
0
10
20
30
-10
-20
-300 2.5 5 7.5-2.5-5-7.5m
cm
HER
LER
8 GeV
3.5 GeV
M. Sullivan Nov. 9, 2004 B3$KEK2_IR_RADBHA
Detector
Detector
CSL CSR
QCSL QCSR
CSL CSR
QCSRQCSL
Q1EL
Q1ER
Q2PL
Q2PR
0.5
11.5
22.5
3
LER gammas
0.5
12
3
4 5
6 7
HER gammas
Super KEKB IR
0
10
20
30
-10
-20
-300 2.5 5 7.5-2.5-5-7.5m
cm
M. Sullivan Nov. 13, 2004B3$_SUPER_KEK_RADBHA
HER
LER
8 GeV
3.5 GeV
Detector
QCSRQCSL
QC1LEQC2LE
QC2LP
QC1RE
QC2RE
QC2RP
Detector
Difference of QCS position is the reasonShower caused by over bend particle
Pointed out by M.Sallivanin 6th HLWS (Nov,2004)
Rad. Bhabha BG sim. for Super-Rad. Bhabha BG sim. for Super-KEKBKEKB
FWDEndCap
BWDEndCap
Barrel
L=1034 /cm2/s
~4 % oftotal BG
L=25x1034
/cm2/s
Expected BGfrom other
sources with heavy metaltotal ~ 1.5 ton
Realistic designbased on discussionwith QCS group
Average Vacuum Average Vacuum 5x105x10-7-7 Pa Pa
1st layer
Super-KEKB (current) design
Does Belle-CDC work with L=3.51035 ?
r = 15cm
Layer
Hit
rat
e/w
ire (
k Hz)
Exp 27 Run 206
HER 1.1ALER 1.5AL=9.6x1033cm-1s-1
MainInner
Cathode
Layer
Num
ber
of h
its
Bhabha ev.
2000
2002
Layer 49
Layer 49
Layer 1
Layer 1
Layer 3
Layer 3
Radiation damage to the present CDC
Efficiency for Bhabha tracks
Gain drift
No rad. damage has been observedafter 0.2C/cm irradiation.
Track Reconstruction under High Background
5 10 15 200
Background factor
5 10 15 200
Background factor
0
20
40
60
80
100
Rec
onst
ruct
ion
eff.
(%
)
High pT (B)
Low pT (BD(Ds))
will be improved by replacingthe inner part by Si.
MC + real background at Belle
Tentative conclusion
Drift chamber can be used in L=3.51035 at r>15cm.
The detector is designed as an upgrade of Belle detector.
Baseline Design of SuperBelle
Vertexing detector: “striplet” + APV25 or pixel Central drift chamber: small cell + faster gas PID device: TOP(B) + Aerogel RICH(E) EM calorimeter: Pure CsI + tetrode (E) Scintillator KLM Pipelined DAQ Much bigger computing system
Issue
Belle/BaBar joint workshop– 2004, Jan (Hawaii)– 2005, April (Hawaii)
6 workshops to discuss physics, detector and accelerator issues.– 2001, Aug: 1st workshop at KEK– 2002, Jan (KEK)– 2002, Aug (Shonan)– 2003, Feb (KEK)– 2003, Sep (Shuzenji)– 2004, Nov (KEK)
Workshop at Shuzenji(Sep. 24-26, 2003)
Who? – Open Question
• Letter of Intent for KEK Super B Factory (KEK Report 2004-4)• Physics at Super B Factory (hep-ex/0406071)
• Letter of Intent for KEK Super B Factory (KEK Report 2004-4)• Physics at Super B Factory (hep-ex/0406071)
268 authors
Mt. Tsukuba
Injection Linac
Tsukuba exp. hallKEKB ring
e(HER, 8GeV) + e(LER, 3.5GeV) (4s) BB ( 1nb) Lorentz boost = 0.425Finite angle crossing : 211 mrad
Where?
When? - Proposed Schedule
2004 05 06 07 08 09 10 11 12
KEKB SuperKEKB>1000fb-1
Calendar year
Crab cavity
KEKBmachine
SuperKEKB const.
J-PARC 1 construction ILC constructionConstruct.fund
“Minor” upgrade “Major” upgradeBelle
Operationfund
T2K
How much? - Estimated Cost
Summary
Why? – Search for new origin of flavor mixing and CP violation
How? – Increase NB, decrease y*, and crab crossing: L=3.51035/cm2/s
What? – New beam pipe, crab cavity, new injector with damping ring. Belle will also be upgraded assuming DC is usable.
Who? – YOU! Where? – Upgrade existing KEKB. When? – JFY2009 and 2010 How much? – US$450M