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Super B Factories. Some news about Super B Factories Available physics studies for Super B Factories Plan/proposals by SuperKEKB study group Questions for discussions. Masashi Hazumi (KEK). Belle/KEKB Luminosity Milestone: 500 fb -1 = 0.5 ab -1. (Equivalent to > 500 million BB-pairs).

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Super b factories

Super B Factories

  • Some news about Super B Factories

  • Available physics studies for Super B Factories

  • Plan/proposals by SuperKEKB study group

  • Questions for discussions

Masashi Hazumi (KEK)

Belle/KEKB Luminosity Milestone: 500 fb-1=0.5 ab-1

(Equivalent to > 500 million BB-pairs)


Current Total =546 fb-1

(as of Feb 6, 2006)

Expect many new results by summer 2006 !

Crab crossing beginning of superb


Crab crossing: beginning of SuperB !

Crab crossing may increase the beam-beam parameter up to 0.19 !

K. Ohmi

(Strong-weak simulation)

Head-on (crab)

(Strong-strong simulation)

crossing angle 22 mrad

Superconducting crab cavities are now being tested, will be installed in KEKB around March 2006.

Superkekb luminosity projection




NBB (1010)


We are here.


NBB ~100  now !

in the LHC era

SuperKEKB Luminosity Projection

  • Crab cavity installation in 2006

  • ~2109 BB pairs by 2008 (4now)

  • Long shutdown (14months) in 2009-2010

  • Constant improvement from 2010

    • realistic and reliable plan based on experiences at KEKB

    • Crab cavities well tested before 2010: a big advantage !

2 GeV e+ injection

2 GeV e+ damping ring

4GeV e–

2x3km or 6km

e– gun


5 GeV e+ SC Linac

4 GeV e– SC Linac

e– dump

7GeV e+

transport lines for energy return

A Linear SuperB Factory

slide by A.Hoecker at CCSG symposium in Orsay, Jan.2006

  • Recent workshop: ; publication: physics/0512235

  • Promising new idea using synergy with ILC research

P. Raimondi, WS Hawaii 2005

achieveL ~ 1036 cm–2s–1 through very small beam-spot size: (x,y) submicrons (ATF2-FF)

(yields luminosity enhancement of >103 compared to original SLAC-Super-B design)

Beam-beam “disruption” parameter

achieve small transversal emittance in damping ring with short damping time (< 1.5ms)

  • Several design alternatives under examination

SBF layout with one damping ring and superconducting linacs

Available physics studies
Available physics studies

  • SuperKEKB: hep-ex/0406071

  • SuperBaBar: hep-ph/0503261

  • Additional SuperKEKB studies at the last CERN Flavor WS in Nov. 2005

    • Plenary talk “Future prospects for B factories” by M. Hazumi

    • WG2 talk “Prospects for Measurements of b g sg, b g sll and b g ctn / tn at Super-B” by T. Iijima

    • Cf. Many other talks from Belle/BaBar on present results

Super b physics reach
Super B Physics Reach

from SuperKEKB LoI




w/ improvement

simple projection

CPV (b g s)





w/ n

tl Ks



10-9 10-8 10-7 10-6 10-5

Upper limit on Br

Radiative decays
Radiative Decays

  • Inclusive Br(bsg) |C7|, SF for |Vub|

  • BK*g isospin asymmetry (D+-) sign of C7

  • Mixing induced CPV

  • Direct CPV in BXsg

  • BXdg

Summary by M.Nakao

1st Super-B workshop

at Hawaii

K. Hara (KEK)

M. Hazumi (KEK)


based on

S.Khalil and E.Kou

PRD67, 055009 (2003)

and SuperKEKB LoI

Cpv in b g s and susy breaking
CPV in b g s and SUSY breaking

  • Correlations are useful to differentiate new physics models

Expected precision at 5ab-1

T.Goto, Y.Okada, Y.Shimizu,T.Shindou, M.Tanaka (2002, 2004) + SuperKEKB LoI

More tests of susy breaking scenarios

Br( tgmg)


Br(b g sg)


A(b g sg)

AFB(b g sll)



A(b g sg)

Br(b g sg)

AFB(b g sll)

More tests of SUSY breaking scenarios


SUSY GUT relation

Correlation to b g s

DS0 implies lower bound on Br(tgmg)

T.Goto, Y.Okada, Y.Shimizu,T.Shindou, M.Tanaka (2002, 2004) + SuperKEKB LoI

Susy breaking at superkekb
SUSY breaking at SuperKEKB

TCPV in B -> K*g

TCPV in B ->f Ks

Direct asymmetry

in b -> s g

T.Goto, Y.Okada, Y.Shimizu,T.Shindou, M.Tanaka (2002, 2004) + SuperKEKB LoI

Parity of new physics

from slides by

M. Endo at HL06 workshop, 2004

M. Yamaguchi at ICFP2005

Parity of new physics

M. Endo, S. Mishima, M. Yamaguchi

PLB609, 95 (2005)

LL or LR

RL or RR

Charged higgs


Charged Higgs





  • Uncertain regions could be clarified by B-Factories

  • depends on all other SUSY parameters …

How to distinguish the m or a t phase from the d d 23 phase
How to distinguish the m or At phase from the dd23 phase ?

P. Ko, SuperBaBar physics book (hep-ph/0503261) p.400

(p.410 in printed version)

Plan proposals by superkekb study group
Plan/proposals by SuperKEKB study group

  • Update SuperKEKB sensitivities

    • This can be done locally.

    • Most likely after ICHEP2006 (can use present estimations for the time being)

  • Combined plots with model calculations, discovery potentials

    • Observables: a set of b g s observables, t LFV, b g ctn, tn

    • Benchmark models should include

      • EWBGEN-motivated SUSY with sizable effects in B decays (e.g. effective SUSY)

      • SUSY GUT (to demonstrate correlations b/w b g s and tgm)

      • Model(s) that (can) accommodate observed CKM hierarchy: e.g. SUSY + flavor symmetry

      • Models that (can) explain the number of generations ?: e.g. superstring-inspired ?

      • Extra dim. ?

      • Whatever else interesting

  • Synergy study 1 with LHCb: e.g. b g s observables from both exps.

  • Synergy study 2 with leptons (WG3): e.g. tgm and mg e

  • Synergy study 3 with high pt (WG1)

    • e.g. SUSY GUT, test of EWBGEN, narrowing down SUSY breaking scenarios, charged Higgs

  • More studies if time/manpower allows

Questions for discussions
Questions (for discussions)

  • How to show discovery potential ?

    • Some people want “energy/mass reach”, which is sometimes irrelevant for flavor physics (mass reach can be very high assuming a strong coupling)

  • Are models proposed in the previous slide reasonable ?

    • If so, is it possible for the theory community to come up with a reasonable set of benchmark models ?

  • What do we use for QCD engineering, QCDF, pQCD, anything else ?

    • Need to choose something as a standard tool

  • How can experimentalists access model calculations ?

    • SuperKEKB LoI: theorists provided a big table of outputs (observables as a function of input parameters)

    • Can we have “generators” that can be used by experimentalists ?

      • exp. gets more freedom

      • th. may get more citations

    • Better way ?

  • Additional observables that were not covered previously ?

    • e.g. B g Kp, B g VV triple-product correlations NOT included in SuperKEKB LoI





G.L.Kane, P.Ko, Haibin Wang, C.Kolda, Jae-hyeon Park, Lian-Tao Wang,

PRD70, 035015 (2004)

Caution !

This fig. does not

take into account

SUSY breakdown

at large mass.

Should be used only for

illustration purpose.

from Jae-hyeon Park