current status of physics & future prospect @ kekb np higgs sm figure by dr. hayasaka (nagoya...

Current Status of Physics & Future Prospect @ KEKB

NP

Higgs

SM

Figure byDr. Hayasaka(Nagoya Univ.)

June 20, 2007Supersymmetry in 2010’s @ Hokkaido Univ.

Toru Iijima / Nagoya University

Introduction

Current status: CP violation & CKM

Recent Topics:– Decay with missing energy

B , D*

Future ProspectB/ physics in the LHC eraSuper B-Factory

Summary

Talk Outline

2

Tree1: What we already see.

Tree2: What we starting to see.

Tree3: What we will see.

The Road to NPThe Road to NP2007/6/21 Toru ijima, SUSY2010's

e+ source

Ares RF cavity

Belle detectorSCC RF(HER)

ARES(LER)

The KEKB Collider

e- (8.0GeV) × e+ (3.5GeV)⇒(4S) →BB

⇒Lorentz boost: = 0.425

Finite crossing angle- 11mrad ×2

Operation since 1999.

Peak luminosity 1.71 x 1034 cm-2s-1 !

4

Belle Detector

2007/6/21 Toru ijima, SUSY2010's

International Collaboration: BelleInternational Collaboration: Belle

13 countries, 55 institutes, ~400 collaborators

Aomori U.BINPChiba U.Chonnam Nat’l U.U. of CincinnatiEwha Womans U.Frankfurt U.Gyeongsang Nat’l U.U. of HawaiiHiroshima Tech.IHEP, BeijingIHEP, Moscow

Nagoya U.Nara Women’s U.National Central U.National Taiwan U.National United U.Nihon Dental CollegeNiigata U.Osaka U.Osaka City U.Panjab U.Peking U.U. of PittsburghPrinceton U.RikenSaga U.USTC

Seoul National U.Shinshu U.Sungkyunkwan U.U. of SydneyTata InstituteToho U.Tohoku U.Tohuku Gakuin U.U. of TokyoTokyo Inst. of Tech.Tokyo Metropolitan U.Tokyo U. of Agri. and Tech.Toyama Nat’l CollegeU. of TsukubaVPIYonsei U.

IHEP, ViennaITEPKanagawa U.KEKKorea U.Krakow Inst. of Nucl. Phys.Kyoto U. Kyungpook Nat’l U. EPF Lausanne

Jozef Stefan Inst. /

U. of Ljubljana /

U. of MariborU. of Melbourne

6

Integrated Luminosity

PEP-IIfor BaBar

As of Mar. 15, 2007

KEKBfor BelleKEKB/Belle: 709.9 fb-1

(4S): 620.6 fb-1 (5S): 21.2 fb-1

(3S): 2.9 fb-1

Off-peak: 58.9 fb-1

PEP-II/BaBar: 406.2 fb-1


Search for Light Dark Matter Results of Y(3S) running (2.9 fb-1 w/ special trigger)

Even if (1S) is invisible, we canobserve via cascade decay Y(3S) Y(1S)invisible

as a recoil mass peak

Recent Hot TopicsPRL 98, 132001 (2007)

S

No way to search Light dark matterfor direct search experimentsThe heaviest quarkonium, Upsilon ,has potential for Invisible (i.e. Dark Matter) decay Phys. Rev. D 72, 103508 (2005)

Demonstration with control sampleY(3S) Y(1S), Y(1S)data

Fit BG Prediction in Phys. Rev. D 72, 1035 (2005)Br(Y(1S)invisble)=6.0x10-3

Br(Y(1S)invisible) 2.5x103 (90%C.L.)

Disfavored

8

Belle Physics Milestone

Observation of BK l+ l-Large CP Violation in B

Discovery of X(3872)

Hint of NP in B->K0

Direct CPV in B0K+

Evidence of B

Observation of bd

Exciting results every year !# of publications =~40 / year219 in total (submitted)

Exciting results every year !# of publications =~40 / year219 in total (submitted)

Observation of DCPV in B+-

Evidence of D0 mixing


Tree 1:Current status: CP violation & CKM

9The Road to NPThe Road to NP



B Decays and the Unitarity Triangle

B→B→

“Time-dependent CP asym. (Indirect CPV)”

B-B mixing

B→/B→K*

B→J/ Ks

B→K

B→DK

B→/K& Other charmless decays

“Partial rate asym(Direct CPV)”

Inclusive b→ul Exclusivell…

Inclusive b→cl ExclusiveD*l…

* * *ub cb tbud cd tdV V +V V +V V =0

10

Mar. 2007Mar. 2007

sin21 = 0.6780.025 (4% accuracy)sin21 = 0.6780.025 (4% accuracy)

PRL 98, 031802 (2007) hep-ex/0703021

World avg.(i.e. with OPAL,ALEPH,CDF)

BB00 J/ J/(2S)(2S)KKSS, , ccKKSS, , c1c1KKSS, , J/J/

BB00 J/ J/

(1 = 21.3 1.0 deg.)

Average withB factories only

Hazumi@Flavour in era of LHC

CPV in bs Penguin Processes

2007/6/21 Toru ijima, SUSY2010's 12

bc

sW

/J

d d SK

0B

cb s

s

sg

NP ?

d d SK

0B

• Heavy particles may be mediated in the quantum loop.

• In SM, CPV(B0Ks) = CPV(B0J/Ks)

• If a new particle carries a quantum new phase CPV(B0Ks) ≠CPV(B0J/Ks)

CP dN1 PA (t) sin2( + ) sin(Δ t)m

Mar. 2007: Mar. 2007: 11 with with bb ss Penguins PenguinsSmaller than bccs in all of 9 modesSmaller than bccs in all of 9 modes

Theory tends to predict positive shifts(originating from phase in Vts)

Naïve average of all b s modes

sin2eff = 0.53 ± 0.052.6 deviation betweenpenguin and tree (b s) (b c)

Naïve average of all b s modes

sin2eff = 0.53 ± 0.052.6 deviation betweenpenguin and tree (b s) (b c)

More statistics crucial for mode-by-mode studies

Hazumi@Flavour in era of LHC

2: B+-

50-5

+1

-1

0

t (ps)

Asy

m.

Num

. of

Ev.

0

100

200

300

t (ps)

Asy

m.

Num

. of E

v. B0 tag

B0 tag

A = 0.55 0.08 0.05S = 0.61 0.10 0.04

535MBB hep-ex/0608035

Direct CPV @ 5.5

383MBBC(A) = 0.21 0.09 0.02 S = 0.60 0.11 0.03

hep-ex/0703016

CPV @ 5.5122 1092

deg.

2007/6/21 14Toru ijima, SUSY2010's

3: BDK(*)

Use DCPV via interference between bc and bu tree decays.

Three methods are used

– GLW (D0fCP)

– ADS (DCSD)– GGSZ (Dalitz)

15

/3 = [62 ]+38

u

b

u

uc

sW

B+d

D0

Vcs

V*ub

fCOM

3

u

b

u

su

c

W

B+d D0

+Vus

V*cb _

fCOM

3


|Vub| Measurement Semileptonic decays are the most common utilities.

Measurement of b→ul suffer from O(103) larger b→clbackground, and need introduce a cut extrapolation error.

In B factory era, tagging allows us to measure not only Pl, but also Mx and q2, by which the extrapolation error can be reduced.

16

L

Pl at endpointBelle, PLB621, 28(2005)

2 2

2B D

B

m mE

m

~10%

Mx (hadron mass)Belle, PRL95, 141801(2005)

X DM M ~80%

3(4.49 0.19 0.27) 10ubV

|Vub| from inclusive bu(ICHEP2006, BLNP)


|Vtd|

BB mixing

17

(~4% accuracy)

0.507 0.005

17.77 0.10 0.07d

s

m

m

0.00810.00600.2060 0.0007td

ts

VV

exp. theo..

B/K*

Vts

W

u,c, tb s

s,d

BF(B ( / ))

BF(B K *)VtdVts

2mB

2 m2

mB2 mK*

2

3

2 1 R

VtdVts

0.197 0.0180.019 (exp)0.015(th)

B

0.23 60.21( ) (1.22 0.05) 10Br

Belle+BaBar


Success of B Factories

KM model of CPV has been firmly established. sin21= +0.678±0.025 is now a precise measurement (~4%).

The other angles are becoming interesting. 2 from / /

– 21+3 from BD(*) 3 from BDK (w/ D Dalitz)

+ side measurements too.

|Vcb|, |Vub|. mdms

Paradigm change: look forAlternatives to CKM

Corrections by NPNeed far precise tests

Tree 2:Recent Hot Topics: / D(*) H+



20

B

Proceed via W annihilation in the SM.

SM Branching fraction is given by

b

u W

fB determination

tan cotb um m

b

u H/W

tanm

Sensitive to the charged Higgs


Full Reconstruction Method Fully reconstruct one of the B’s to tag

– B production– B flavor/charge– B momentum

Υ(4S)

e (8GeV)

e+(3.5GeV)

B

B

full (0.1~0.3%)reconstructionBD etc.

Single B meson beam in offline !

Decays of interests BXu l , BK BD,

Powerful tools for B decays w/ neutrinos

B Candidate Event

BB++ D D0 0 ++

KK++ - - ++ --

BB-- --

ee--

The 1st Evidence of B The final results are deduced by unbinned

likelihood fit to the obtained EECL distributions.

Signal shape : Gauss + exponentialBackground shape : second-order polynomial

+ Gauss (peaking component)

Signal +

background

Background

B

Signal

Observe 17.2 events.

Significance decreased to 3.5 after including systematics

+5.3 - 4.7

: Statistical Significance

PRL97, 251802 (2006)

24

Constraints on Charged Higgs

2rH

A

A

B

tan / HmB


BD(*) Sensitive to the charged Higgs. Theoretical systematics from the form factor.

Additional information from polarization.

( )tan cotb c um m cb

H/W

tan cotb cm m

tanm

25

Decay amplitude2tanbm m

Tauonic decay is the most sensitive !

fB in case of

Belle has observed B0 D*-+ !

BD* : Reconstruction

26

from K.-F.Cheng’ talk @ FPCP07


B D* : Results


28

Cross Checks

e

background

signal

cos cos

Mtag >5.275 Mtag <5.26

signal

otherD*

backgroundFit to signal side variable

Mtag >5.27

Preliminary


Tree 3:Future Prospect,Super-B



Super-B: Motivation

If new physics at O(1)TeV…– It is natural to assume that the effects are seen in B/D/

decays.– New source of CP violation ?– Flavour structure of new physics?– These studies will be useful to identify mechanism of

SUSY breaking, if NP=SUSY.

Otherwise…– Search for deviations from SM in flavor physics will be

one of the best ways to find new physics.

2007/6/21 Toru ijima, SUSY2010's 30

Physics Reach at Super-B

New CPV phase in bsqq

FCNC

BXs, BXsll

Modes including

CKM

decays

5ab-1 50ab-1Physics at Super B Factory (hep-ex/0406071)

We are working to update the table.

Search for New CPV in bs

32

B B KK00, , ’K’K00, KsKsKs , KsKsKs projection projection for SuperKEKBfor SuperKEKB

|AS

US

Y/A

SM|2

new physics

Discovery region w/ 50 abDiscovery region w/ 50 ab-1-1


Acp(BXs) vs SUSY models

mSUGURAtan=30

U(2)tan=30

SU(5)+R

tan=30degenerate

SU(5)+R

tan=30non-degenerate

( )gm GeV

mSUGURAtan=30

U(2)tan=30

SU(5)+R

tan=30degenerate

SU(5)+R

tan=30non-degenerate

( )gm GeV

Mixing CPVDirect CPV

Acp

dir

Acp

mix

5ab-1 50ab-1

Charged Higgs Search in B

Charged Higgs Mass Reach (95.5%CL exclusion @ tan=30)

Only exp. error(Vub=0%, fB=0%)

Vub=5%, fB=5%

Vub=2.5%, fB=2.5%

Mass

Reach

(G

eV

)

Luminsoity(ab-1)

Now5ab-1

b

u W

LFV in Decays Quarks and neutrinos have

mixings. What about charged leptons ?

What are the relations between neutrinos and charged leptons ?quarks and charged leptons ?

Br() = O(103-5) x Br(). Enough chance to see or lll.

The two decays have different sensitivity for different NP models.

35

( )e

0

( )e223(13)l

(m )

( )s

( )s

h

3l, l

l


Br~O(10-89) at Super B factory !

T LFV Prospect

suffers frombackground due to ISR.

Interaction RegionCrab crossing

=30mrad.y*=3mm

New QCS

Super-KEKB

Linac upgrade

More RF power

Damping ring

New Beam pipe

L

2ere

Iyy

*RLRy

Increase beam currents•1.6 A (LER) / 1.2 A (HER) → 9.4 A (LER) / 4.1 A (HER)

Smaller y*

• 6 mm→3 mm

Increase y

• 0.059→>0.24(W-S)

L=8x1035cm-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.

Crab Cavity

Superconducting crab cavities (1LER and 1HER) have been installed, and being tested at KEKB.

39

L 2ere

Iyy*


HER LER

Crab OFF

Crab ON

H. Ikeda, et al.

Detector Upgrade

Higher background

Higher event rate

Require special features- low p m identification - full recon. eff.- hermeticity ; “reconstruction”

- radiation damage and occupancy- fake hits and pile-up noise in the EM

- higher rate trigger, DAQ and computing

Issues Vertexing

Tracking

Particle ID

EM Cal

KL &

Vertexing

Tracking

Particle ID

EM Cal

KL &

Pixel det.

Small cellFast gasSi-tracker

F-DIRC+TOPAerogel RICH

Pure CsILiquid-Xe etc.

LSTScintillator

Fully pipelined readout Large scale computing

Fully pipelined readout Large scale computing

New Challenge! Intensive R&Ds!

42

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


Summary

B-factories have been so successful. KM-model of CP violation firmly established. Paradigm shifted to search for NP effects.

We are starting to measure B/D(*) Search for charged Higgs.

Flavor physics still on the center stage in 2010’s.Super-KEKB enables us to study effects of TeV-scale NP in B and decays.


Pushing Luminosity Frontier

L*=X10 / 5 years !

L~1035cm-2s-1 by 2010

L~1036cm-2s-1 by 2015

L~1043cm-2s-1 by 2050 ?

(How old will you be ?)

BOYS BE AMBITIOUS !

Backup Slides

2: B//

46

Beauty2006 FPCP2007

Two solutions in the global CKM fit.Need more data.

10.79.3[92.6 ]


AACPCP(K(K) puzzle ?) puzzle ?

ACP(K+0) = +0.047 0.026ACP(K+) = 0.093 0.015deviation: 0.14/0.03 > 4.6

New physics

ACP(K+0) = +0.047 0.026ACP(K+) = 0.093 0.015deviation: 0.14/0.03 > 4.6

New physics

B D* : Bkg. Suppression


49

fB Extraction

SM branching fraction is given by

Product of B meson decay constant fB and CKM matrix element |Vub|

Using |Vub| = (4.39 0.33)×10-3 from HFAG

1.6 1.1 41.4 1.3(10.1 ) 10B ubf V GeV

fB = 216 22 MeV

[HPQCD, Phys. Rev. Lett. 95, 212001 (2005) ]

15%14% = 12%(exp.) + 8%(Vub)

36 3031 34229Bf MeV


B D* : Bkg. Suppression


Future prospect

Possible sensitivity at 5ab-1

Estimatedupper limitrange of Br

PDG2006BelleBabar

based on eff. and NBG of most sensitive analysis

current status of physics & future prospect @ kekb np higgs sm figure by dr. hayasaka (nagoya...

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