Super B factory plan at KEK Masa Yamauchi KEK Super B Factory Workshop April 20-22, 2005 Honolulu...
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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?
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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
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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.
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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
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Other Evidences for New Physics
fL (B→VV)ACP(B→Kπ)
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Comparison with LHCb
hep-ex/0406071SuperKEKB LoI
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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
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How? - SuperKEKB Parameters
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Crab Cavity
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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)
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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.
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Fight for Higher Beam Current
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ARES for SuperKEKB
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SCC for SuperKEKB
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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 !
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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
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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
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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)
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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
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Average Vacuum Average Vacuum 5x105x10-7-7 Pa Pa
1st layer
Super-KEKB (current) design
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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
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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.
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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
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Tentative conclusion
Drift chamber can be used in L=3.51035 at r>15cm.
The detector is designed as an upgrade of Belle detector.
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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
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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
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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?
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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
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How much? - Estimated Cost
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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