Super B factory plan at KEK
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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 ,

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Super B factory plan at KEK

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Super b factory plan at kek

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

Why? - Roadmap of B Physics

Identification of SUSY

breaking mechanism

Anomalous

CPV in bgsss

sin2f1, CPV in Bgpp,

f3, Vub, Vcb, bgsg,

bgsll, new states etc.

if NP=SUSY

Study of NP effect

in B and t decays

time or

integrated luminosity

Precise test of SM

and search for NP

Yes!!

NP discovered

at LHC(2010?)

Discovery of CPV

in B decays

Now

400 fb-1


Motivations for super kekb

Motivations for Super KEKB

1. Possible anomalies observed in B decays

  • 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 : 3.8s

  • Polarization in penguin dominated B→VV decays

  • ACP(B±→K±p0) ≠ ACP(B0→K±p )

±

These MUST be clarified.

2. New physics will be found soon at LHC.

3. e+e- B factory with L=3.5×1035 is competitive with LHCb.


Anomalous cpv hints new physics

Anomalous CPV hints new physics?

Tree decay

Belle + BaBar, 2004

b

c

J/y

_

B

c

W

_

s

d

_

KS

d

Ave. CPV = 0.726±0.037

equal

if only SM

3.8s deviation

observed

Ave. CPV = 0.41±0.07

W

top

-hf x Sf

penguin decay


Other evidences for new physics

Other Evidences for New Physics

ACP(B→Kπ)

fL (B→VV)


Comparison with lhcb

Comparison with LHCb

SuperKEKB LoI

hep-ex/0406071


Comparison

A.Ishikawa

6th Workshop on Higher Lum. B Factories

November 2004

Comparison

  • K*mm (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 bsg

    • LHCb cannot measure B(bsg), so they should use our value or float A7.

3 times better

*just scaling Belle value with evts.


How superkekb parameters

How? - SuperKEKB Parameters


Crab cavity

Crab Cavity


What superkekb design

What? – SuperKEKB Design

Interaction Region

Crab crossing

q=30mrad.

by*=3mm

New QCS

New Beam pipe

8GeV (e+, 4.1A)

3.5GeV (e-, 9.6A)

More RF power

Damping ring

  • Increase beam currents

  • 1.6 A (LER) / 1.2 A (HER)

  • → 9.6 A (LER) / 4.1 A (HER)

  • Smaller by*

  • 6 mm→3 mm

  • Increase xy

  • 0.05→0.28(W-S)

Linac upgrade

L=3.5x1035cm-2s-1


Super kekb cont d

Ante-chamber

with solenoid field

New crab cavity

Ante-chamber

Circular-chamber

Build-up of

electron clouds

Super-KEKB (cont’d)

  • Head-on collision w/ Crab cavity

Will be tested in 2006.

  • Ante-chamber /solenoid for reduction of electron clouds


Fight for higher beam current

Fight for Higher Beam Current


Ares for superkekb

ARES for SuperKEKB


Scc for superkekb

SCC for SuperKEKB


Kekb upgrade scenario

KEKB Upgrade Scenario

Lpeak = 1.41034cm-2s-1

Ltot = 330fb-1 (Nov.30, 2004)

~1010 BB/year !!

& similar number oft+t-

world records !

Major upgrade of

KEKB & Belle detector

(>1yr shutdown)

SuperKEKB

Crab

cavities

Lpeak (cm-2s-1)

Lint

5x1034

~1 ab-1

1.4x1034

330 fb-1

5x1035

~10 ab-1


Belle upgrade

Belle Upgrade

Aerogel Cherenkov counter

+ TOF counter

g “TOP” + RICH

CsI(Tl) 16X0

g pure CsI (endcap)

Si vtx. det.

4 lyr. DSSD

SC solenoid

1.5T

g 2 pixel/striplet lyrs. + 4 lyr. DSSD

Tracking + dE/dx

small cell + He/C2H5

  • remove inner lyrs.

    Use fast gas

m / KL detection

14/15 lyr. RPC+Fe

g tile scintillator

New readout and computing systems


Q1 does dc work with l 3 5 10 35

Q1: Does DC work with L=3.51035?

  • If NO,

    • Need Si tracker.

    • EM cal, solenoid and iron structure have to be rebuilt!!

  • If YES,

    • Upgrade the present Belle detector.

New detector


Super b factory plan at kek

Difference of QCS position is the reason

Shower caused by over bend particle

Pointed out by M.Sallivan

in 6th HLWS (Nov,2004)


Rad bhabha bg sim for super kekb

Rad. Bhabha BG sim. for Super-KEKB

Barrel

BWD

EndCap

FWD

EndCap

Realistic design

based on discussion

with QCS group

Expected BG

from other sources

with heavy metal

total ~ 1.5 ton

L=25x1034/cm2/s

~4 % of

total BG

L=1034 /cm2/s


Average vacuum 5x10 7 pa

Super-KEKB (current) design

Average Vacuum 5x10-7 Pa

1st layer


Does belle cdc work with l 3 5 10 35

Does Belle-CDC work with L=3.51035 ?

Exp 27 Run 206

HER 1.1A

LER 1.5A

L=9.6x1033cm-1s-1

Hit rate/wire(kHz)

Cathode

Inner

Main

Layer

r = 15cm


Super b factory plan at kek

2000

Layer 49

Layer 1

Layer 3

Layer 49

Layer 1

2002

Layer 3

Radiation damage to the present CDC

Gain drift

Efficiency for Bhabha tracks

Bhabha ev.

Number of hits

Layer

No rad. damage has been observed

after 0.2C/cm irradiation.


Super b factory plan at kek

Track Reconstruction under High Background

MC + real background at Belle

High pT (Bgp+p-)

Low pT (BgD*-(gDps)p+)

100

80

60

Reconstruction eff. (%)

40

20

0

0

5

10

15

20

0

5

10

15

20

Background factor

Background factor

will be improved by replacing

the inner part by Si.


Tentative conclusion

Tentative conclusion

  • Drift chamber can be used in L=3.51035 at r>15cm.

  • The detector is designed as an upgrade of Belle detector.


Baseline design of superbelle

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


Who open questi on

Workshop at Shuzenji

(Sep. 24-26, 2003)

Who? – Open Question

  • 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)

  • Letter of Intent for KEK Super B

  • Factory (KEK Report 2004-4)

  • Physics at Super B Factory

  • (hep-ex/0406071)

268 authors

  • Belle/BaBar joint workshop

    • 2004, Jan (Hawaii)

    • 2005, April (Hawaii)


Super b factory plan at kek

Where?

Mt. Tsukuba

Tsukuba exp. hall

KEKB ring

4e- (HER, 8GeV) + e+ (LER, 3.5GeV)

 (4s)  BB (s 1nb)

 Lorentz boost bg = 0.425

4Finite angle crossing : 211 mrad

Injection Linac


When proposed schedule

When? - Proposed Schedule

J-PARC 1 construction

ILC construction

Construct.

fund

T2K

SuperKEKB const.

Operation

fund

Crab cavity

KEKB

machine

SuperKEKB

KEKB

>1000fb-1

“Major” upgrade

Belle

“Minor” upgrade

2004

05

06

07

08

09

10

11

12

Calendar year


How much estimated cost

How much? - Estimated Cost


Summary

Summary

  • Why? – Search for new origin of flavor mixing and CP violation

  • How? – Increase NB, decrease by*, and crab crossing: L=3.51035/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


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